diff --git a/dist/vue-quagga.js b/dist/vue-quagga.js
index e194bc0..59659c5 100644
--- a/dist/vue-quagga.js
+++ b/dist/vue-quagga.js
@@ -5433,7 +5433,7 @@ var quagga_min_default = /*#__PURE__*/__webpack_require__.n(quagga_min);
         };
       },
       validator: function validator(o) {
-        return typeof o.width === 'number' && typeof o.width === 'number';
+        return typeof o.width === 'number' && typeof o.height === 'number';
       }
     }
   },
diff --git a/dist/vue-quagga.js.map b/dist/vue-quagga.js.map
index 9f72605..d2b3152 100644
--- a/dist/vue-quagga.js.map
+++ b/dist/vue-quagga.js.map
@@ -1 +1 @@
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{yStart1=offset - size|0;yStart2=offset+size|0;xStart1=u - 1|0;xStart2=u+1|0;sum=(images[inImagePtr+yStart1+xStart1|0]|0)+(images[inImagePtr+yStart1+xStart2|0]|0)+(images[inImagePtr+offset+u|0]|0)+(images[inImagePtr+yStart2+xStart1|0]|0)+(images[inImagePtr+yStart2+xStart2|0]|0)|0;if ((sum|0) == (5|0)) {images[outImagePtr+offset+u|0]=1;} else {images[outImagePtr+offset+u|0]=0;}}}return;}function subtract(aImagePtr, bImagePtr, outImagePtr) {aImagePtr=aImagePtr|0;bImagePtr=bImagePtr|0;outImagePtr=outImagePtr|0;var length=0;length=imul(size, size)|0;while ((length|0)>0) {length=length - 1|0;images[outImagePtr+length|0]=(images[aImagePtr+length|0]|0) - (images[bImagePtr+length|0]|0)|0;}}function bitwiseOr(aImagePtr, bImagePtr, outImagePtr) {aImagePtr=aImagePtr|0;bImagePtr=bImagePtr|0;outImagePtr=outImagePtr|0;var length=0;length=imul(size, size)|0;while ((length|0)>0) {length=length - 1|0;images[outImagePtr+length|0]=images[aImagePtr+length|0]|0|(images[bImagePtr+length|0]|0)|0;}}function countNonZero(imagePtr) {imagePtr=imagePtr|0;var sum=0,length=0;length=imul(size, size)|0;while ((length|0)>0) {length=length - 1|0;sum=(sum|0)+(images[imagePtr+length|0]|0)|0;}return sum|0;}function init(imagePtr, value) {imagePtr=imagePtr|0;value=value|0;var length=0;length=imul(size, size)|0;while ((length|0)>0) {length=length - 1|0;images[imagePtr+length|0]=value;}}function dilate(inImagePtr, outImagePtr) {inImagePtr=inImagePtr|0;outImagePtr=outImagePtr|0;var v=0,u=0,sum=0,yStart1=0,yStart2=0,xStart1=0,xStart2=0,offset=0;for (v=1; (v|0)<(size - 1|0); v=v+1|0) {offset=offset+size|0;for (u=1; (u|0)<(size - 1|0); u=u+1|0) {yStart1=offset - size|0;yStart2=offset+size|0;xStart1=u - 1|0;xStart2=u+1|0;sum=(images[inImagePtr+yStart1+xStart1|0]|0)+(images[inImagePtr+yStart1+xStart2|0]|0)+(images[inImagePtr+offset+u|0]|0)+(images[inImagePtr+yStart2+xStart1|0]|0)+(images[inImagePtr+yStart2+xStart2|0]|0)|0;if ((sum|0)>(0|0)) {images[outImagePtr+offset+u|0]=1;} else {images[outImagePtr+offset+u|0]=0;}}}return;}function memcpy(srcImagePtr, dstImagePtr) {srcImagePtr=srcImagePtr|0;dstImagePtr=dstImagePtr|0;var length=0;length=imul(size, size)|0;while ((length|0)>0) {length=length - 1|0;images[dstImagePtr+length|0]=images[srcImagePtr+length|0]|0;}}function zeroBorder(imagePtr) {imagePtr=imagePtr|0;var x=0,y=0;for (x=0; (x|0)<(size - 1|0); x=x+1|0) {images[imagePtr+x|0]=0;images[imagePtr+y|0]=0;y=y+size - 1|0;images[imagePtr+y|0]=0;y=y+1|0;}for (x=0; (x|0)<(size|0); x=x+1|0) {images[imagePtr+y|0]=0;y=y+1|0;}}function skeletonize() {var subImagePtr=0,erodedImagePtr=0,tempImagePtr=0,skelImagePtr=0,sum=0,done=0;erodedImagePtr=imul(size, size)|0;tempImagePtr=erodedImagePtr+erodedImagePtr|0;skelImagePtr=tempImagePtr+erodedImagePtr|0;init(skelImagePtr, 0);zeroBorder(subImagePtr);do {erode(subImagePtr, erodedImagePtr);dilate(erodedImagePtr, tempImagePtr);subtract(subImagePtr, tempImagePtr, tempImagePtr);bitwiseOr(skelImagePtr, tempImagePtr, skelImagePtr);memcpy(erodedImagePtr, subImagePtr);sum=countNonZero(subImagePtr)|0;done=(sum|0) == 0|0;} while (!done);}return {skeletonize: skeletonize};} __webpack_exports__[\"a\"]=Skeletonizer; },function(t,e,n){\"use strict\";function r(t){o.a.call(this,t),this.barSpaceRatio=[1,1]}var o=n(1),i=1,a=3,u={START_PATTERN:{value:[a,i,a,i,i,i]},STOP_PATTERN:{value:[a,i,i,i,a]},CODE_PATTERN:{value:[[i,i,a,a,i],[a,i,i,i,a],[i,a,i,i,a],[a,a,i,i,i],[i,i,a,i,a],[a,i,a,i,i],[i,a,a,i,i],[i,i,i,a,a],[a,i,i,a,i],[i,a,i,a,i]]},SINGLE_CODE_ERROR:{value:.78,writable:!0},AVG_CODE_ERROR:{value:.3,writable:!0},FORMAT:{value:\"2of5\"}},c=u.START_PATTERN.value.reduce(function(t,e){return t+e},0);r.prototype=Object.create(o.a.prototype,u),r.prototype.constructor=r,r.prototype._findPattern=function(t,e,n,r){var o,i,a,u,c=[],s=this,f=0,l={error:Number.MAX_VALUE,code:-1,start:0,end:0},d=s.AVG_CODE_ERROR;for(n=n||!1,r=r||!1,e||(e=s._nextSet(s._row)),o=0;o<t.length;o++)c[o]=0;for(o=e;o<s._row.length;o++)if(s._row[o]^n)c[f]++;else{if(f===c.length-1){for(u=0,a=0;a<c.length;a++)u+=c[a];if((i=s._matchPattern(c,t))<d)return l.error=i,l.start=o-u,l.end=o,l;if(!r)return null;for(a=0;a<c.length-2;a++)c[a]=c[a+2];c[c.length-2]=0,c[c.length-1]=0,f--}else f++;c[f]=1,n=!n}return null},r.prototype._findStart=function(){for(var t,e,n=this,r=n._nextSet(n._row),o=1;!e;){if(!(e=n._findPattern(n.START_PATTERN,r,!1,!0)))return null;if(o=Math.floor((e.end-e.start)/c),(t=e.start-5*o)>=0&&n._matchRange(t,e.start,0))return e;r=e.end,e=null}},r.prototype._verifyTrailingWhitespace=function(t){var e,n=this;return e=t.end+(t.end-t.start)/2,e<n._row.length&&n._matchRange(t.end,e,0)?t:null},r.prototype._findEnd=function(){var t,e,n,r=this;return r._row.reverse(),n=r._nextSet(r._row),t=r._findPattern(r.STOP_PATTERN,n,!1,!0),r._row.reverse(),null===t?null:(e=t.start,t.start=r._row.length-t.end,t.end=r._row.length-e,null!==t?r._verifyTrailingWhitespace(t):null)},r.prototype._decodeCode=function(t){var e,n,r,o=this,i=0,a=o.AVG_CODE_ERROR,u={error:Number.MAX_VALUE,code:-1,start:0,end:0};for(e=0;e<t.length;e++)i+=t[e];for(r=0;r<o.CODE_PATTERN.length;r++)(n=o._matchPattern(t,o.CODE_PATTERN[r]))<u.error&&(u.code=r,u.error=n);if(u.error<a)return u},r.prototype._decodePayload=function(t,e,n){for(var r,o,i=this,a=0,u=t.length,c=[0,0,0,0,0];a<u;){for(r=0;r<5;r++)c[r]=t[a]*this.barSpaceRatio[0],a+=2;if(!(o=i._decodeCode(c)))return null;e.push(o.code+\"\"),n.push(o)}return o},r.prototype._verifyCounterLength=function(t){return t.length%10==0},r.prototype._decode=function(){var t,e,n,r=this,o=[],i=[];return(t=r._findStart())?(i.push(t),(e=r._findEnd())?(n=r._fillCounters(t.end,e.start,!1),r._verifyCounterLength(n)&&r._decodePayload(n,o,i)?o.length<5?null:(i.push(e),{code:o.join(\"\"),start:t.start,end:e.end,startInfo:t,decodedCodes:i}):null):null):null},e.a=r},function(t,e,n){\"use strict\";function r(){o.a.call(this),this._counters=[]}var o=n(1),i={ALPHABETH_STRING:{value:\"0123456789-$:/.+ABCD\"},ALPHABET:{value:[48,49,50,51,52,53,54,55,56,57,45,36,58,47,46,43,65,66,67,68]},CHARACTER_ENCODINGS:{value:[3,6,9,96,18,66,33,36,48,72,12,24,69,81,84,21,26,41,11,14]},START_END:{value:[26,41,11,14]},MIN_ENCODED_CHARS:{value:4},MAX_ACCEPTABLE:{value:2},PADDING:{value:1.5},FORMAT:{value:\"codabar\",writeable:!1}};r.prototype=Object.create(o.a.prototype,i),r.prototype.constructor=r,r.prototype._decode=function(){var t,e,n,r,o,i=this,a=[];if(this._counters=i._fillCounters(),!(t=i._findStart()))return null;r=t.startCounter;do{if((n=i._toPattern(r))<0)return null;if((e=i._patternToChar(n))<0)return null;if(a.push(e),r+=8,a.length>1&&i._isStartEnd(n))break}while(r<i._counters.length);return a.length-2<i.MIN_ENCODED_CHARS||!i._isStartEnd(n)?null:i._verifyWhitespace(t.startCounter,r-8)&&i._validateResult(a,t.startCounter)?(r=r>i._counters.length?i._counters.length:r,o=t.start+i._sumCounters(t.startCounter,r-8),{code:a.join(\"\"),start:t.start,end:o,startInfo:t,decodedCodes:a}):null},r.prototype._verifyWhitespace=function(t,e){return(t-1<=0||this._counters[t-1]>=this._calculatePatternLength(t)/2)&&(e+8>=this._counters.length||this._counters[e+7]>=this._calculatePatternLength(e)/2)},r.prototype._calculatePatternLength=function(t){var e,n=0;for(e=t;e<t+7;e++)n+=this._counters[e];return n},r.prototype._thresholdResultPattern=function(t,e){var n,r,o,i,a,u=this,c={space:{narrow:{size:0,counts:0,min:0,max:Number.MAX_VALUE},wide:{size:0,counts:0,min:0,max:Number.MAX_VALUE}},bar:{narrow:{size:0,counts:0,min:0,max:Number.MAX_VALUE},wide:{size:0,counts:0,min:0,max:Number.MAX_VALUE}}},s=e;for(o=0;o<t.length;o++){for(a=u._charToPattern(t[o]),i=6;i>=0;i--)n=2==(1&i)?c.bar:c.space,r=1==(1&a)?n.wide:n.narrow,r.size+=u._counters[s+i],r.counts++,a>>=1;s+=8}return[\"space\",\"bar\"].forEach(function(t){var e=c[t];e.wide.min=Math.floor((e.narrow.size/e.narrow.counts+e.wide.size/e.wide.counts)/2),e.narrow.max=Math.ceil(e.wide.min),e.wide.max=Math.ceil((e.wide.size*u.MAX_ACCEPTABLE+u.PADDING)/e.wide.counts)}),c},r.prototype._charToPattern=function(t){var e,n=this,r=t.charCodeAt(0);for(e=0;e<n.ALPHABET.length;e++)if(n.ALPHABET[e]===r)return n.CHARACTER_ENCODINGS[e];return 0},r.prototype._validateResult=function(t,e){var n,r,o,i,a,u,c=this,s=c._thresholdResultPattern(t,e),f=e;for(n=0;n<t.length;n++){for(u=c._charToPattern(t[n]),r=6;r>=0;r--){if(o=0==(1&r)?s.bar:s.space,i=1==(1&u)?o.wide:o.narrow,(a=c._counters[f+r])<i.min||a>i.max)return!1;u>>=1}f+=8}return!0},r.prototype._patternToChar=function(t){var e,n=this;for(e=0;e<n.CHARACTER_ENCODINGS.length;e++)if(n.CHARACTER_ENCODINGS[e]===t)return String.fromCharCode(n.ALPHABET[e]);return-1},r.prototype._computeAlternatingThreshold=function(t,e){var n,r,o=Number.MAX_VALUE,i=0;for(n=t;n<e;n+=2)r=this._counters[n],r>i&&(i=r),r<o&&(o=r);return(o+i)/2|0},r.prototype._toPattern=function(t){var e,n,r,o,i=7,a=t+i,u=1<<i-1,c=0;if(a>this._counters.length)return-1;for(e=this._computeAlternatingThreshold(t,a),n=this._computeAlternatingThreshold(t+1,a),r=0;r<i;r++)o=0==(1&r)?e:n,this._counters[t+r]>o&&(c|=u),u>>=1;return c},r.prototype._isStartEnd=function(t){var e;for(e=0;e<this.START_END.length;e++)if(this.START_END[e]===t)return!0;return!1},r.prototype._sumCounters=function(t,e){var n,r=0;for(n=t;n<e;n++)r+=this._counters[n];return r},r.prototype._findStart=function(){var t,e,n,r=this,o=r._nextUnset(r._row);for(t=1;t<this._counters.length;t++)if((e=r._toPattern(t))!==-1&&r._isStartEnd(e))return o+=r._sumCounters(0,t),n=o+r._sumCounters(t,t+8),{start:o,end:n,startCounter:t,endCounter:t+8}},e.a=r},function(t,e,n){\"use strict\";function r(){i.a.call(this)}function o(t,e,n){for(var r=n.length,o=0,i=0;r--;)i+=t[n[r]],o+=e[n[r]];return i/o}var i=n(1),a={CODE_SHIFT:{value:98},CODE_C:{value:99},CODE_B:{value:100},CODE_A:{value:101},START_CODE_A:{value:103},START_CODE_B:{value:104},START_CODE_C:{value:105},STOP_CODE:{value:106},CODE_PATTERN:{value:[[2,1,2,2,2,2],[2,2,2,1,2,2],[2,2,2,2,2,1],[1,2,1,2,2,3],[1,2,1,3,2,2],[1,3,1,2,2,2],[1,2,2,2,1,3],[1,2,2,3,1,2],[1,3,2,2,1,2],[2,2,1,2,1,3],[2,2,1,3,1,2],[2,3,1,2,1,2],[1,1,2,2,3,2],[1,2,2,1,3,2],[1,2,2,2,3,1],[1,1,3,2,2,2],[1,2,3,1,2,2],[1,2,3,2,2,1],[2,2,3,2,1,1],[2,2,1,1,3,2],[2,2,1,2,3,1],[2,1,3,2,1,2],[2,2,3,1,1,2],[3,1,2,1,3,1],[3,1,1,2,2,2],[3,2,1,1,2,2],[3,2,1,2,2,1],[3,1,2,2,1,2],[3,2,2,1,1,2],[3,2,2,2,1,1],[2,1,2,1,2,3],[2,1,2,3,2,1],[2,3,2,1,2,1],[1,1,1,3,2,3],[1,3,1,1,2,3],[1,3,1,3,2,1],[1,1,2,3,1,3],[1,3,2,1,1,3],[1,3,2,3,1,1],[2,1,1,3,1,3],[2,3,1,1,1,3],[2,3,1,3,1,1],[1,1,2,1,3,3],[1,1,2,3,3,1],[1,3,2,1,3,1],[1,1,3,1,2,3],[1,1,3,3,2,1],[1,3,3,1,2,1],[3,1,3,1,2,1],[2,1,1,3,3,1],[2,3,1,1,3,1],[2,1,3,1,1,3],[2,1,3,3,1,1],[2,1,3,1,3,1],[3,1,1,1,2,3],[3,1,1,3,2,1],[3,3,1,1,2,1],[3,1,2,1,1,3],[3,1,2,3,1,1],[3,3,2,1,1,1],[3,1,4,1,1,1],[2,2,1,4,1,1],[4,3,1,1,1,1],[1,1,1,2,2,4],[1,1,1,4,2,2],[1,2,1,1,2,4],[1,2,1,4,2,1],[1,4,1,1,2,2],[1,4,1,2,2,1],[1,1,2,2,1,4],[1,1,2,4,1,2],[1,2,2,1,1,4],[1,2,2,4,1,1],[1,4,2,1,1,2],[1,4,2,2,1,1],[2,4,1,2,1,1],[2,2,1,1,1,4],[4,1,3,1,1,1],[2,4,1,1,1,2],[1,3,4,1,1,1],[1,1,1,2,4,2],[1,2,1,1,4,2],[1,2,1,2,4,1],[1,1,4,2,1,2],[1,2,4,1,1,2],[1,2,4,2,1,1],[4,1,1,2,1,2],[4,2,1,1,1,2],[4,2,1,2,1,1],[2,1,2,1,4,1],[2,1,4,1,2,1],[4,1,2,1,2,1],[1,1,1,1,4,3],[1,1,1,3,4,1],[1,3,1,1,4,1],[1,1,4,1,1,3],[1,1,4,3,1,1],[4,1,1,1,1,3],[4,1,1,3,1,1],[1,1,3,1,4,1],[1,1,4,1,3,1],[3,1,1,1,4,1],[4,1,1,1,3,1],[2,1,1,4,1,2],[2,1,1,2,1,4],[2,1,1,2,3,2],[2,3,3,1,1,1,2]]},SINGLE_CODE_ERROR:{value:.64},AVG_CODE_ERROR:{value:.3},FORMAT:{value:\"code_128\",writeable:!1},MODULE_INDICES:{value:{bar:[0,2,4],space:[1,3,5]}}};r.prototype=Object.create(i.a.prototype,a),r.prototype.constructor=r,r.prototype._decodeCode=function(t,e){var n,r,i,a=[0,0,0,0,0,0],u=this,c=t,s=!u._row[c],f=0,l={error:Number.MAX_VALUE,code:-1,start:t,end:t,correction:{bar:1,space:1}};for(n=c;n<u._row.length;n++)if(u._row[n]^s)a[f]++;else{if(f===a.length-1){for(e&&u._correct(a,e),r=0;r<u.CODE_PATTERN.length;r++)(i=u._matchPattern(a,u.CODE_PATTERN[r]))<l.error&&(l.code=r,l.error=i);return l.end=n,l.code===-1||l.error>u.AVG_CODE_ERROR?null:(u.CODE_PATTERN[l.code]&&(l.correction.bar=o(u.CODE_PATTERN[l.code],a,this.MODULE_INDICES.bar),l.correction.space=o(u.CODE_PATTERN[l.code],a,this.MODULE_INDICES.space)),l)}f++,a[f]=1,s=!s}return null},r.prototype._correct=function(t,e){this._correctBars(t,e.bar,this.MODULE_INDICES.bar),this._correctBars(t,e.space,this.MODULE_INDICES.space)},r.prototype._findStart=function(){var t,e,n,r,i,a=[0,0,0,0,0,0],u=this,c=u._nextSet(u._row),s=!1,f=0,l={error:Number.MAX_VALUE,code:-1,start:0,end:0,correction:{bar:1,space:1}};for(t=c;t<u._row.length;t++)if(u._row[t]^s)a[f]++;else{if(f===a.length-1){for(i=0,r=0;r<a.length;r++)i+=a[r];for(e=u.START_CODE_A;e<=u.START_CODE_C;e++)(n=u._matchPattern(a,u.CODE_PATTERN[e]))<l.error&&(l.code=e,l.error=n);if(l.error<u.AVG_CODE_ERROR)return l.start=t-i,l.end=t,l.correction.bar=o(u.CODE_PATTERN[l.code],a,this.MODULE_INDICES.bar),l.correction.space=o(u.CODE_PATTERN[l.code],a,this.MODULE_INDICES.space),l;for(r=0;r<4;r++)a[r]=a[r+2];a[4]=0,a[5]=0,f--}else f++;a[f]=1,s=!s}return null},r.prototype._decode=function(){var t,e,n=this,r=n._findStart(),o=null,i=!1,a=[],u=0,c=0,s=[],f=[],l=!1,d=!0;if(null===r)return null;switch(o={code:r.code,start:r.start,end:r.end,correction:{bar:r.correction.bar,space:r.correction.space}},f.push(o),c=o.code,o.code){case n.START_CODE_A:t=n.CODE_A;break;case n.START_CODE_B:t=n.CODE_B;break;case n.START_CODE_C:t=n.CODE_C;break;default:return null}for(;!i;){if(e=l,l=!1,null!==(o=n._decodeCode(o.end,o.correction)))switch(o.code!==n.STOP_CODE&&(d=!0),o.code!==n.STOP_CODE&&(s.push(o.code),u++,c+=u*o.code),f.push(o),t){case n.CODE_A:if(o.code<64)a.push(String.fromCharCode(32+o.code));else if(o.code<96)a.push(String.fromCharCode(o.code-64));else switch(o.code!==n.STOP_CODE&&(d=!1),o.code){case n.CODE_SHIFT:l=!0,t=n.CODE_B;break;case n.CODE_B:t=n.CODE_B;break;case n.CODE_C:t=n.CODE_C;break;case n.STOP_CODE:i=!0}break;case n.CODE_B:if(o.code<96)a.push(String.fromCharCode(32+o.code));else switch(o.code!==n.STOP_CODE&&(d=!1),o.code){case n.CODE_SHIFT:l=!0,t=n.CODE_A;break;case n.CODE_A:t=n.CODE_A;break;case n.CODE_C:t=n.CODE_C;break;case n.STOP_CODE:i=!0}break;case n.CODE_C:if(o.code<100)a.push(o.code<10?\"0\"+o.code:o.code);else switch(o.code!==n.STOP_CODE&&(d=!1),o.code){case n.CODE_A:t=n.CODE_A;break;case n.CODE_B:t=n.CODE_B;break;case n.STOP_CODE:i=!0}}else i=!0;e&&(t=t===n.CODE_A?n.CODE_B:n.CODE_A)}return null===o?null:(o.end=n._nextUnset(n._row,o.end),n._verifyTrailingWhitespace(o)?(c-=u*s[s.length-1])%103!==s[s.length-1]?null:a.length?(d&&a.splice(a.length-1,1),{code:a.join(\"\"),start:r.start,end:o.end,codeset:t,startInfo:r,decodedCodes:f,endInfo:o}):null:null)},i.a.prototype._verifyTrailingWhitespace=function(t){var e,n=this;return e=t.end+(t.end-t.start)/2,e<n._row.length&&n._matchRange(t.end,e,0)?t:null},e.a=r},function(t,e,n){\"use strict\";function r(){o.a.call(this)}var o=n(31),i={IOQ:/[IOQ]/g,AZ09:/[A-Z0-9]{17}/};r.prototype=Object.create(o.a.prototype),r.prototype.constructor=r,r.prototype._decode=function(){var t=o.a.prototype._decode.apply(this);if(!t)return null;var e=t.code;return e?(e=e.replace(i.IOQ,\"\"),e.match(i.AZ09)&&this._checkChecksum(e)?(t.code=e,t):null):null},r.prototype._checkChecksum=function(t){return!!t},e.a=r},function(t,e,n){\"use strict\";function r(){o.a.call(this)}var o=n(1),i=n(3),a=\"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ-. $/+%abcd*\",u={ALPHABETH_STRING:{value:a},ALPHABET:{value:a.split(\"\").map(function(t){return t.charCodeAt(0)})},CHARACTER_ENCODINGS:{value:[276,328,324,322,296,292,290,336,274,266,424,420,418,404,402,394,360,356,354,308,282,344,332,326,300,278,436,434,428,422,406,410,364,358,310,314,302,468,466,458,366,374,430,294,474,470,306,350]},ASTERISK:{value:350},FORMAT:{value:\"code_93\",writeable:!1}};r.prototype=Object.create(o.a.prototype,u),r.prototype.constructor=r,r.prototype._decode=function(){var t,e,n,r,o=this,a=[0,0,0,0,0,0],u=[],c=o._findStart();if(!c)return null;r=o._nextSet(o._row,c.end);do{if(a=o._toCounters(r,a),(n=o._toPattern(a))<0)return null;if((t=o._patternToChar(n))<0)return null;u.push(t),e=r,r+=i.a.sum(a),r=o._nextSet(o._row,r)}while(\"*\"!==t);return u.pop(),u.length&&o._verifyEnd(e,r,a)&&o._verifyChecksums(u)?(u=u.slice(0,u.length-2),null===(u=o._decodeExtended(u))?null:{code:u.join(\"\"),start:c.start,end:r,startInfo:c,decodedCodes:u}):null},r.prototype._verifyEnd=function(t,e){return!(t===e||!this._row[e])},r.prototype._patternToChar=function(t){var e,n=this;for(e=0;e<n.CHARACTER_ENCODINGS.length;e++)if(n.CHARACTER_ENCODINGS[e]===t)return String.fromCharCode(n.ALPHABET[e]);return-1},r.prototype._toPattern=function(t){for(var e=t.length,n=0,r=0,o=0;o<e;o++)r+=t[o];for(var i=0;i<e;i++){var a=Math.round(9*t[i]/r);if(a<1||a>4)return-1;if(0==(1&i))for(var u=0;u<a;u++)n=n<<1|1;else n<<=a}return n},r.prototype._findStart=function(){var t,e,n,r=this,o=r._nextSet(r._row),i=o,a=[0,0,0,0,0,0],u=0,c=!1;for(t=o;t<r._row.length;t++)if(r._row[t]^c)a[u]++;else{if(u===a.length-1){if(r._toPattern(a)===r.ASTERISK&&(n=Math.floor(Math.max(0,i-(t-i)/4)),r._matchRange(n,i,0)))return{start:i,end:t};for(i+=a[0]+a[1],e=0;e<4;e++)a[e]=a[e+2];a[4]=0,a[5]=0,u--}else u++;a[u]=1,c=!c}return null},r.prototype._decodeExtended=function(t){for(var e=t.length,n=[],r=0;r<e;r++){var o=t[r];if(o>=\"a\"&&o<=\"d\"){if(r>e-2)return null;var i=t[++r],a=i.charCodeAt(0),u=void 0;switch(o){case\"a\":if(!(i>=\"A\"&&i<=\"Z\"))return null;u=String.fromCharCode(a-64);break;case\"b\":if(i>=\"A\"&&i<=\"E\")u=String.fromCharCode(a-38);else if(i>=\"F\"&&i<=\"J\")u=String.fromCharCode(a-11);else if(i>=\"K\"&&i<=\"O\")u=String.fromCharCode(a+16);else if(i>=\"P\"&&i<=\"S\")u=String.fromCharCode(a+43);else{if(!(i>=\"T\"&&i<=\"Z\"))return null;u=String.fromCharCode(127)}break;case\"c\":if(i>=\"A\"&&i<=\"O\")u=String.fromCharCode(a-32);else{if(\"Z\"!==i)return 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o,i,a,u,c=[],s=this,f=0,l={error:Number.MAX_VALUE,code:-1,start:0,end:0},d=s.AVG_CODE_ERROR;for(n=n||!1,r=r||!1,e||(e=s._nextSet(s._row)),o=0;o<t.length;o++)c[o]=0;for(o=e;o<s._row.length;o++)if(s._row[o]^n)c[f]++;else{if(f===c.length-1){for(u=0,a=0;a<c.length;a++)u+=c[a];if((i=s._matchPattern(c,t))<d)return l.error=i,l.start=o-u,l.end=o,l;if(!r)return null;for(a=0;a<c.length-2;a++)c[a]=c[a+2];c[c.length-2]=0,c[c.length-1]=0,f--}else f++;c[f]=1,n=!n}return null},r.prototype._findStart=function(){for(var t,e,n=this,r=n._nextSet(n._row),o=1;!e;){if(!(e=n._findPattern(n.START_PATTERN,r,!1,!0)))return null;if(o=Math.floor((e.end-e.start)/4),(t=e.start-10*o)>=0&&n._matchRange(t,e.start,0))return e;r=e.end,e=null}},r.prototype._verifyTrailingWhitespace=function(t){var e,n=this;return e=t.end+(t.end-t.start)/2,e<n._row.length&&n._matchRange(t.end,e,0)?t:null},r.prototype._findEnd=function(){var t,e,n=this;return n._row.reverse(),t=n._findPattern(n.STOP_PATTERN),n._row.reverse(),null===t?null:(e=t.start,t.start=n._row.length-t.end,t.end=n._row.length-e,null!==t?n._verifyTrailingWhitespace(t):null)},r.prototype._decodePair=function(t){var e,n,r=[],o=this;for(e=0;e<t.length;e++){if(!(n=o._decodeCode(t[e])))return null;r.push(n)}return r},r.prototype._decodeCode=function(t){var e,n,r,o=this,i=0,a=o.AVG_CODE_ERROR,u={error:Number.MAX_VALUE,code:-1,start:0,end:0};for(e=0;e<t.length;e++)i+=t[e];for(r=0;r<o.CODE_PATTERN.length;r++)(n=o._matchPattern(t,o.CODE_PATTERN[r]))<u.error&&(u.code=r,u.error=n);if(u.error<a)return u},r.prototype._decodePayload=function(t,e,n){for(var r,o,i=this,a=0,u=t.length,c=[[0,0,0,0,0],[0,0,0,0,0]];a<u;){for(r=0;r<5;r++)c[0][r]=t[a]*this.barSpaceRatio[0],c[1][r]=t[a+1]*this.barSpaceRatio[1],a+=2;if(!(o=i._decodePair(c)))return null;for(r=0;r<o.length;r++)e.push(o[r].code+\"\"),n.push(o[r])}return o},r.prototype._verifyCounterLength=function(t){return 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blob.trim().split('\\n').map(function(line) {\n    return line.trim();\n  });\n};\n// Splits SDP into sessionpart and mediasections. Ensures CRLF.\nSDPUtils.splitSections = function(blob) {\n  var parts = blob.split('\\nm=');\n  return parts.map(function(part, index) {\n    return (index > 0 ? 'm=' + part : part).trim() + '\\r\\n';\n  });\n};\n\n// returns the session description.\nSDPUtils.getDescription = function(blob) {\n  var sections = SDPUtils.splitSections(blob);\n  return sections && sections[0];\n};\n\n// returns the individual media sections.\nSDPUtils.getMediaSections = function(blob) {\n  var sections = SDPUtils.splitSections(blob);\n  sections.shift();\n  return sections;\n};\n\n// Returns lines that start with a certain prefix.\nSDPUtils.matchPrefix = function(blob, prefix) {\n  return SDPUtils.splitLines(blob).filter(function(line) {\n    return line.indexOf(prefix) === 0;\n  });\n};\n\n// Parses an ICE candidate line. Sample input:\n// candidate:702786350 2 udp 41819902 8.8.8.8 60769 typ relay raddr 8.8.8.8\n// rport 55996\"\nSDPUtils.parseCandidate = function(line) {\n  var parts;\n  // Parse both variants.\n  if (line.indexOf('a=candidate:') === 0) {\n    parts = line.substring(12).split(' ');\n  } else {\n    parts = line.substring(10).split(' ');\n  }\n\n  var candidate = {\n    foundation: parts[0],\n    component: parseInt(parts[1], 10),\n    protocol: parts[2].toLowerCase(),\n    priority: parseInt(parts[3], 10),\n    ip: parts[4],\n    address: parts[4], // address is an alias for ip.\n    port: parseInt(parts[5], 10),\n    // skip parts[6] == 'typ'\n    type: parts[7]\n  };\n\n  for (var i = 8; i < parts.length; i += 2) {\n    switch (parts[i]) {\n      case 'raddr':\n        candidate.relatedAddress = parts[i + 1];\n        break;\n      case 'rport':\n        candidate.relatedPort = parseInt(parts[i + 1], 10);\n        break;\n      case 'tcptype':\n        candidate.tcpType = parts[i + 1];\n        break;\n      case 'ufrag':\n        candidate.ufrag = parts[i + 1]; // for backward compability.\n        candidate.usernameFragment = parts[i + 1];\n        break;\n      default: // extension handling, in particular ufrag\n        candidate[parts[i]] = parts[i + 1];\n        break;\n    }\n  }\n  return candidate;\n};\n\n// Translates a candidate object into SDP candidate attribute.\nSDPUtils.writeCandidate = function(candidate) {\n  var sdp = [];\n  sdp.push(candidate.foundation);\n  sdp.push(candidate.component);\n  sdp.push(candidate.protocol.toUpperCase());\n  sdp.push(candidate.priority);\n  sdp.push(candidate.address || candidate.ip);\n  sdp.push(candidate.port);\n\n  var type = candidate.type;\n  sdp.push('typ');\n  sdp.push(type);\n  if (type !== 'host' && candidate.relatedAddress &&\n      candidate.relatedPort) {\n    sdp.push('raddr');\n    sdp.push(candidate.relatedAddress);\n    sdp.push('rport');\n    sdp.push(candidate.relatedPort);\n  }\n  if (candidate.tcpType && candidate.protocol.toLowerCase() === 'tcp') {\n    sdp.push('tcptype');\n    sdp.push(candidate.tcpType);\n  }\n  if (candidate.usernameFragment || candidate.ufrag) {\n    sdp.push('ufrag');\n    sdp.push(candidate.usernameFragment || candidate.ufrag);\n  }\n  return 'candidate:' + sdp.join(' ');\n};\n\n// Parses an ice-options line, returns an array of option tags.\n// a=ice-options:foo bar\nSDPUtils.parseIceOptions = function(line) {\n  return line.substr(14).split(' ');\n};\n\n// Parses an rtpmap line, returns RTCRtpCoddecParameters. Sample input:\n// a=rtpmap:111 opus/48000/2\nSDPUtils.parseRtpMap = function(line) {\n  var parts = line.substr(9).split(' ');\n  var parsed = {\n    payloadType: parseInt(parts.shift(), 10) // was: id\n  };\n\n  parts = parts[0].split('/');\n\n  parsed.name = parts[0];\n  parsed.clockRate = parseInt(parts[1], 10); // was: clockrate\n  parsed.channels = parts.length === 3 ? parseInt(parts[2], 10) : 1;\n  // legacy alias, got renamed back to channels in ORTC.\n  parsed.numChannels = parsed.channels;\n  return parsed;\n};\n\n// Generate an a=rtpmap line from RTCRtpCodecCapability or\n// RTCRtpCodecParameters.\nSDPUtils.writeRtpMap = function(codec) {\n  var pt = codec.payloadType;\n  if (codec.preferredPayloadType !== undefined) {\n    pt = codec.preferredPayloadType;\n  }\n  var channels = codec.channels || codec.numChannels || 1;\n  return 'a=rtpmap:' + pt + ' ' + codec.name + '/' + codec.clockRate +\n      (channels !== 1 ? '/' + channels : '') + '\\r\\n';\n};\n\n// Parses an a=extmap line (headerextension from RFC 5285). Sample input:\n// a=extmap:2 urn:ietf:params:rtp-hdrext:toffset\n// a=extmap:2/sendonly urn:ietf:params:rtp-hdrext:toffset\nSDPUtils.parseExtmap = function(line) {\n  var parts = line.substr(9).split(' ');\n  return {\n    id: parseInt(parts[0], 10),\n    direction: parts[0].indexOf('/') > 0 ? parts[0].split('/')[1] : 'sendrecv',\n    uri: parts[1]\n  };\n};\n\n// Generates a=extmap line from RTCRtpHeaderExtensionParameters or\n// RTCRtpHeaderExtension.\nSDPUtils.writeExtmap = function(headerExtension) {\n  return 'a=extmap:' + (headerExtension.id || headerExtension.preferredId) +\n      (headerExtension.direction && headerExtension.direction !== 'sendrecv'\n          ? '/' + headerExtension.direction\n          : '') +\n      ' ' + headerExtension.uri + '\\r\\n';\n};\n\n// Parses an ftmp line, returns dictionary. Sample input:\n// a=fmtp:96 vbr=on;cng=on\n// Also deals with vbr=on; cng=on\nSDPUtils.parseFmtp = function(line) {\n  var parsed = {};\n  var kv;\n  var parts = line.substr(line.indexOf(' ') + 1).split(';');\n  for (var j = 0; j < parts.length; j++) {\n    kv = parts[j].trim().split('=');\n    parsed[kv[0].trim()] = kv[1];\n  }\n  return parsed;\n};\n\n// Generates an a=ftmp line from RTCRtpCodecCapability or RTCRtpCodecParameters.\nSDPUtils.writeFmtp = function(codec) {\n  var line = '';\n  var pt = codec.payloadType;\n  if (codec.preferredPayloadType !== undefined) {\n    pt = codec.preferredPayloadType;\n  }\n  if (codec.parameters && Object.keys(codec.parameters).length) {\n    var params = [];\n    Object.keys(codec.parameters).forEach(function(param) {\n      if (codec.parameters[param]) {\n        params.push(param + '=' + codec.parameters[param]);\n      } else {\n        params.push(param);\n      }\n    });\n    line += 'a=fmtp:' + pt + ' ' + params.join(';') + '\\r\\n';\n  }\n  return line;\n};\n\n// Parses an rtcp-fb line, returns RTCPRtcpFeedback object. Sample input:\n// a=rtcp-fb:98 nack rpsi\nSDPUtils.parseRtcpFb = function(line) {\n  var parts = line.substr(line.indexOf(' ') + 1).split(' ');\n  return {\n    type: parts.shift(),\n    parameter: parts.join(' ')\n  };\n};\n// Generate a=rtcp-fb lines from RTCRtpCodecCapability or RTCRtpCodecParameters.\nSDPUtils.writeRtcpFb = function(codec) {\n  var lines = '';\n  var pt = codec.payloadType;\n  if (codec.preferredPayloadType !== undefined) {\n    pt = codec.preferredPayloadType;\n  }\n  if (codec.rtcpFeedback && codec.rtcpFeedback.length) {\n    // FIXME: special handling for trr-int?\n    codec.rtcpFeedback.forEach(function(fb) {\n      lines += 'a=rtcp-fb:' + pt + ' ' + fb.type +\n      (fb.parameter && fb.parameter.length ? ' ' + fb.parameter : '') +\n          '\\r\\n';\n    });\n  }\n  return lines;\n};\n\n// Parses an RFC 5576 ssrc media attribute. Sample input:\n// a=ssrc:3735928559 cname:something\nSDPUtils.parseSsrcMedia = function(line) {\n  var sp = line.indexOf(' ');\n  var parts = {\n    ssrc: parseInt(line.substr(7, sp - 7), 10)\n  };\n  var colon = line.indexOf(':', sp);\n  if (colon > -1) {\n    parts.attribute = line.substr(sp + 1, colon - sp - 1);\n    parts.value = line.substr(colon + 1);\n  } else {\n    parts.attribute = line.substr(sp + 1);\n  }\n  return parts;\n};\n\nSDPUtils.parseSsrcGroup = function(line) {\n  var parts = line.substr(13).split(' ');\n  return {\n    semantics: parts.shift(),\n    ssrcs: parts.map(function(ssrc) {\n      return parseInt(ssrc, 10);\n    })\n  };\n};\n\n// Extracts the MID (RFC 5888) from a media section.\n// returns the MID or undefined if no mid line was found.\nSDPUtils.getMid = function(mediaSection) {\n  var mid = SDPUtils.matchPrefix(mediaSection, 'a=mid:')[0];\n  if (mid) {\n    return mid.substr(6);\n  }\n};\n\nSDPUtils.parseFingerprint = function(line) {\n  var parts = line.substr(14).split(' ');\n  return {\n    algorithm: parts[0].toLowerCase(), // algorithm is case-sensitive in Edge.\n    value: parts[1]\n  };\n};\n\n// Extracts DTLS parameters from SDP media section or sessionpart.\n// FIXME: for consistency with other functions this should only\n//   get the fingerprint line as input. See also getIceParameters.\nSDPUtils.getDtlsParameters = function(mediaSection, sessionpart) {\n  var lines = SDPUtils.matchPrefix(mediaSection + sessionpart,\n      'a=fingerprint:');\n  // Note: a=setup line is ignored since we use the 'auto' role.\n  // Note2: 'algorithm' is not case sensitive except in Edge.\n  return {\n    role: 'auto',\n    fingerprints: lines.map(SDPUtils.parseFingerprint)\n  };\n};\n\n// Serializes DTLS parameters to SDP.\nSDPUtils.writeDtlsParameters = function(params, setupType) {\n  var sdp = 'a=setup:' + setupType + '\\r\\n';\n  params.fingerprints.forEach(function(fp) {\n    sdp += 'a=fingerprint:' + fp.algorithm + ' ' + fp.value + '\\r\\n';\n  });\n  return sdp;\n};\n// Parses ICE information from SDP media section or sessionpart.\n// FIXME: for consistency with other functions this should only\n//   get the ice-ufrag and ice-pwd lines as input.\nSDPUtils.getIceParameters = function(mediaSection, sessionpart) {\n  var lines = SDPUtils.splitLines(mediaSection);\n  // Search in session part, too.\n  lines = lines.concat(SDPUtils.splitLines(sessionpart));\n  var iceParameters = {\n    usernameFragment: lines.filter(function(line) {\n      return line.indexOf('a=ice-ufrag:') === 0;\n    })[0].substr(12),\n    password: lines.filter(function(line) {\n      return line.indexOf('a=ice-pwd:') === 0;\n    })[0].substr(10)\n  };\n  return iceParameters;\n};\n\n// Serializes ICE parameters to SDP.\nSDPUtils.writeIceParameters = function(params) {\n  return 'a=ice-ufrag:' + params.usernameFragment + '\\r\\n' +\n      'a=ice-pwd:' + params.password + '\\r\\n';\n};\n\n// Parses the SDP media section and returns RTCRtpParameters.\nSDPUtils.parseRtpParameters = function(mediaSection) {\n  var description = {\n    codecs: [],\n    headerExtensions: [],\n    fecMechanisms: [],\n    rtcp: []\n  };\n  var lines = SDPUtils.splitLines(mediaSection);\n  var mline = lines[0].split(' ');\n  for (var i = 3; i < mline.length; i++) { // find all codecs from mline[3..]\n    var pt = mline[i];\n    var rtpmapline = SDPUtils.matchPrefix(\n        mediaSection, 'a=rtpmap:' + pt + ' ')[0];\n    if (rtpmapline) {\n      var codec = SDPUtils.parseRtpMap(rtpmapline);\n      var fmtps = SDPUtils.matchPrefix(\n          mediaSection, 'a=fmtp:' + pt + ' ');\n      // Only the first a=fmtp:<pt> is considered.\n      codec.parameters = fmtps.length ? SDPUtils.parseFmtp(fmtps[0]) : {};\n      codec.rtcpFeedback = SDPUtils.matchPrefix(\n          mediaSection, 'a=rtcp-fb:' + pt + ' ')\n        .map(SDPUtils.parseRtcpFb);\n      description.codecs.push(codec);\n      // parse FEC mechanisms from rtpmap lines.\n      switch (codec.name.toUpperCase()) {\n        case 'RED':\n        case 'ULPFEC':\n          description.fecMechanisms.push(codec.name.toUpperCase());\n          break;\n        default: // only RED and ULPFEC are recognized as FEC mechanisms.\n          break;\n      }\n    }\n  }\n  SDPUtils.matchPrefix(mediaSection, 'a=extmap:').forEach(function(line) {\n    description.headerExtensions.push(SDPUtils.parseExtmap(line));\n  });\n  // FIXME: parse rtcp.\n  return description;\n};\n\n// Generates parts of the SDP media section describing the capabilities /\n// parameters.\nSDPUtils.writeRtpDescription = function(kind, caps) {\n  var sdp = '';\n\n  // Build the mline.\n  sdp += 'm=' + kind + ' ';\n  sdp += caps.codecs.length > 0 ? '9' : '0'; // reject if no codecs.\n  sdp += ' UDP/TLS/RTP/SAVPF ';\n  sdp += caps.codecs.map(function(codec) {\n    if (codec.preferredPayloadType !== undefined) {\n      return codec.preferredPayloadType;\n    }\n    return codec.payloadType;\n  }).join(' ') + '\\r\\n';\n\n  sdp += 'c=IN IP4 0.0.0.0\\r\\n';\n  sdp += 'a=rtcp:9 IN IP4 0.0.0.0\\r\\n';\n\n  // Add a=rtpmap lines for each codec. Also fmtp and rtcp-fb.\n  caps.codecs.forEach(function(codec) {\n    sdp += SDPUtils.writeRtpMap(codec);\n    sdp += SDPUtils.writeFmtp(codec);\n    sdp += SDPUtils.writeRtcpFb(codec);\n  });\n  var maxptime = 0;\n  caps.codecs.forEach(function(codec) {\n    if (codec.maxptime > maxptime) {\n      maxptime = codec.maxptime;\n    }\n  });\n  if (maxptime > 0) {\n    sdp += 'a=maxptime:' + maxptime + '\\r\\n';\n  }\n  sdp += 'a=rtcp-mux\\r\\n';\n\n  if (caps.headerExtensions) {\n    caps.headerExtensions.forEach(function(extension) {\n      sdp += SDPUtils.writeExtmap(extension);\n    });\n  }\n  // FIXME: write fecMechanisms.\n  return sdp;\n};\n\n// Parses the SDP media section and returns an array of\n// RTCRtpEncodingParameters.\nSDPUtils.parseRtpEncodingParameters = function(mediaSection) {\n  var encodingParameters = [];\n  var description = SDPUtils.parseRtpParameters(mediaSection);\n  var hasRed = description.fecMechanisms.indexOf('RED') !== -1;\n  var hasUlpfec = description.fecMechanisms.indexOf('ULPFEC') !== -1;\n\n  // filter a=ssrc:... cname:, ignore PlanB-msid\n  var ssrcs = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:')\n  .map(function(line) {\n    return SDPUtils.parseSsrcMedia(line);\n  })\n  .filter(function(parts) {\n    return parts.attribute === 'cname';\n  });\n  var primarySsrc = ssrcs.length > 0 && ssrcs[0].ssrc;\n  var secondarySsrc;\n\n  var flows = SDPUtils.matchPrefix(mediaSection, 'a=ssrc-group:FID')\n  .map(function(line) {\n    var parts = line.substr(17).split(' ');\n    return parts.map(function(part) {\n      return parseInt(part, 10);\n    });\n  });\n  if (flows.length > 0 && flows[0].length > 1 && flows[0][0] === primarySsrc) {\n    secondarySsrc = flows[0][1];\n  }\n\n  description.codecs.forEach(function(codec) {\n    if (codec.name.toUpperCase() === 'RTX' && codec.parameters.apt) {\n      var encParam = {\n        ssrc: primarySsrc,\n        codecPayloadType: parseInt(codec.parameters.apt, 10)\n      };\n      if (primarySsrc && secondarySsrc) {\n        encParam.rtx = {ssrc: secondarySsrc};\n      }\n      encodingParameters.push(encParam);\n      if (hasRed) {\n        encParam = JSON.parse(JSON.stringify(encParam));\n        encParam.fec = {\n          ssrc: primarySsrc,\n          mechanism: hasUlpfec ? 'red+ulpfec' : 'red'\n        };\n        encodingParameters.push(encParam);\n      }\n    }\n  });\n  if (encodingParameters.length === 0 && primarySsrc) {\n    encodingParameters.push({\n      ssrc: primarySsrc\n    });\n  }\n\n  // we support both b=AS and b=TIAS but interpret AS as TIAS.\n  var bandwidth = SDPUtils.matchPrefix(mediaSection, 'b=');\n  if (bandwidth.length) {\n    if (bandwidth[0].indexOf('b=TIAS:') === 0) {\n      bandwidth = parseInt(bandwidth[0].substr(7), 10);\n    } else if (bandwidth[0].indexOf('b=AS:') === 0) {\n      // use formula from JSEP to convert b=AS to TIAS value.\n      bandwidth = parseInt(bandwidth[0].substr(5), 10) * 1000 * 0.95\n          - (50 * 40 * 8);\n    } else {\n      bandwidth = undefined;\n    }\n    encodingParameters.forEach(function(params) {\n      params.maxBitrate = bandwidth;\n    });\n  }\n  return encodingParameters;\n};\n\n// parses http://draft.ortc.org/#rtcrtcpparameters*\nSDPUtils.parseRtcpParameters = function(mediaSection) {\n  var rtcpParameters = {};\n\n  // Gets the first SSRC. Note tha with RTX there might be multiple\n  // SSRCs.\n  var remoteSsrc = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:')\n      .map(function(line) {\n        return SDPUtils.parseSsrcMedia(line);\n      })\n      .filter(function(obj) {\n        return obj.attribute === 'cname';\n      })[0];\n  if (remoteSsrc) {\n    rtcpParameters.cname = remoteSsrc.value;\n    rtcpParameters.ssrc = remoteSsrc.ssrc;\n  }\n\n  // Edge uses the compound attribute instead of reducedSize\n  // compound is !reducedSize\n  var rsize = SDPUtils.matchPrefix(mediaSection, 'a=rtcp-rsize');\n  rtcpParameters.reducedSize = rsize.length > 0;\n  rtcpParameters.compound = rsize.length === 0;\n\n  // parses the rtcp-mux attrіbute.\n  // Note that Edge does not support unmuxed RTCP.\n  var mux = SDPUtils.matchPrefix(mediaSection, 'a=rtcp-mux');\n  rtcpParameters.mux = mux.length > 0;\n\n  return rtcpParameters;\n};\n\n// parses either a=msid: or a=ssrc:... msid lines and returns\n// the id of the MediaStream and MediaStreamTrack.\nSDPUtils.parseMsid = function(mediaSection) {\n  var parts;\n  var spec = SDPUtils.matchPrefix(mediaSection, 'a=msid:');\n  if (spec.length === 1) {\n    parts = spec[0].substr(7).split(' ');\n    return {stream: parts[0], track: parts[1]};\n  }\n  var planB = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:')\n  .map(function(line) {\n    return SDPUtils.parseSsrcMedia(line);\n  })\n  .filter(function(msidParts) {\n    return msidParts.attribute === 'msid';\n  });\n  if (planB.length > 0) {\n    parts = planB[0].value.split(' ');\n    return {stream: parts[0], track: parts[1]};\n  }\n};\n\n// Generate a session ID for SDP.\n// https://tools.ietf.org/html/draft-ietf-rtcweb-jsep-20#section-5.2.1\n// recommends using a cryptographically random +ve 64-bit value\n// but right now this should be acceptable and within the right range\nSDPUtils.generateSessionId = function() {\n  return Math.random().toString().substr(2, 21);\n};\n\n// Write boilder plate for start of SDP\n// sessId argument is optional - if not supplied it will\n// be generated randomly\n// sessVersion is optional and defaults to 2\n// sessUser is optional and defaults to 'thisisadapterortc'\nSDPUtils.writeSessionBoilerplate = function(sessId, sessVer, sessUser) {\n  var sessionId;\n  var version = sessVer !== undefined ? sessVer : 2;\n  if (sessId) {\n    sessionId = sessId;\n  } else {\n    sessionId = SDPUtils.generateSessionId();\n  }\n  var user = sessUser || 'thisisadapterortc';\n  // FIXME: sess-id should be an NTP timestamp.\n  return 'v=0\\r\\n' +\n      'o=' + user + ' ' + sessionId + ' ' + version +\n        ' IN IP4 127.0.0.1\\r\\n' +\n      's=-\\r\\n' +\n      't=0 0\\r\\n';\n};\n\nSDPUtils.writeMediaSection = function(transceiver, caps, type, stream) {\n  var sdp = SDPUtils.writeRtpDescription(transceiver.kind, caps);\n\n  // Map ICE parameters (ufrag, pwd) to SDP.\n  sdp += SDPUtils.writeIceParameters(\n      transceiver.iceGatherer.getLocalParameters());\n\n  // Map DTLS parameters to SDP.\n  sdp += SDPUtils.writeDtlsParameters(\n      transceiver.dtlsTransport.getLocalParameters(),\n      type === 'offer' ? 'actpass' : 'active');\n\n  sdp += 'a=mid:' + transceiver.mid + '\\r\\n';\n\n  if (transceiver.direction) {\n    sdp += 'a=' + transceiver.direction + '\\r\\n';\n  } else if (transceiver.rtpSender && transceiver.rtpReceiver) {\n    sdp += 'a=sendrecv\\r\\n';\n  } else if (transceiver.rtpSender) {\n    sdp += 'a=sendonly\\r\\n';\n  } else if (transceiver.rtpReceiver) {\n    sdp += 'a=recvonly\\r\\n';\n  } else {\n    sdp += 'a=inactive\\r\\n';\n  }\n\n  if (transceiver.rtpSender) {\n    // spec.\n    var msid = 'msid:' + stream.id + ' ' +\n        transceiver.rtpSender.track.id + '\\r\\n';\n    sdp += 'a=' + msid;\n\n    // for Chrome.\n    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +\n        ' ' + msid;\n    if (transceiver.sendEncodingParameters[0].rtx) {\n      sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +\n          ' ' + msid;\n      sdp += 'a=ssrc-group:FID ' +\n          transceiver.sendEncodingParameters[0].ssrc + ' ' +\n          transceiver.sendEncodingParameters[0].rtx.ssrc +\n          '\\r\\n';\n    }\n  }\n  // FIXME: this should be written by writeRtpDescription.\n  sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +\n      ' cname:' + SDPUtils.localCName + '\\r\\n';\n  if (transceiver.rtpSender && transceiver.sendEncodingParameters[0].rtx) {\n    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +\n        ' cname:' + SDPUtils.localCName + '\\r\\n';\n  }\n  return sdp;\n};\n\n// Gets the direction from the mediaSection or the sessionpart.\nSDPUtils.getDirection = function(mediaSection, sessionpart) {\n  // Look for sendrecv, sendonly, recvonly, inactive, default to sendrecv.\n  var lines = SDPUtils.splitLines(mediaSection);\n  for (var i = 0; i < lines.length; i++) {\n    switch (lines[i]) {\n      case 'a=sendrecv':\n      case 'a=sendonly':\n      case 'a=recvonly':\n      case 'a=inactive':\n        return lines[i].substr(2);\n      default:\n        // FIXME: What should happen here?\n    }\n  }\n  if (sessionpart) {\n    return SDPUtils.getDirection(sessionpart);\n  }\n  return 'sendrecv';\n};\n\nSDPUtils.getKind = function(mediaSection) {\n  var lines = SDPUtils.splitLines(mediaSection);\n  var mline = lines[0].split(' ');\n  return mline[0].substr(2);\n};\n\nSDPUtils.isRejected = function(mediaSection) {\n  return mediaSection.split(' ', 2)[1] === '0';\n};\n\nSDPUtils.parseMLine = function(mediaSection) {\n  var lines = SDPUtils.splitLines(mediaSection);\n  var parts = lines[0].substr(2).split(' ');\n  return {\n    kind: parts[0],\n    port: parseInt(parts[1], 10),\n    protocol: parts[2],\n    fmt: parts.slice(3).join(' ')\n  };\n};\n\nSDPUtils.parseOLine = function(mediaSection) {\n  var line = SDPUtils.matchPrefix(mediaSection, 'o=')[0];\n  var parts = line.substr(2).split(' ');\n  return {\n    username: parts[0],\n    sessionId: parts[1],\n    sessionVersion: parseInt(parts[2], 10),\n    netType: parts[3],\n    addressType: parts[4],\n    address: parts[5]\n  };\n};\n\n// a very naive interpretation of a valid SDP.\nSDPUtils.isValidSDP = function(blob) {\n  if (typeof blob !== 'string' || blob.length === 0) {\n    return false;\n  }\n  var lines = SDPUtils.splitLines(blob);\n  for (var i = 0; i < lines.length; i++) {\n    if (lines[i].length < 2 || lines[i].charAt(1) !== '=') {\n      return false;\n    }\n    // TODO: check the modifier a bit more.\n  }\n  return true;\n};\n\n// Expose public methods.\nif (typeof module === 'object') {\n  module.exports = SDPUtils;\n}\n","// style-loader: Adds some css to the DOM by adding a <style> tag\n\n// load the styles\nvar content = require(\"!!../node_modules/css-loader/dist/cjs.js!../node_modules/vue-loader/lib/loaders/stylePostLoader.js!../node_modules/vue-loader/lib/index.js??vue-loader-options!./Scanner.vue?vue&type=style&index=0&id=4ebacf15&scoped=true&lang=css&\");\nif(typeof content === 'string') content = [[module.id, content, '']];\nif(content.locals) module.exports = content.locals;\n// add the styles to the DOM\nvar add = require(\"!../node_modules/vue-style-loader/lib/addStylesClient.js\").default\nvar update = add(\"b437ebe2\", content, false, {});\n// Hot Module Replacement\nif(module.hot) {\n // When the styles change, update the <style> tags\n if(!content.locals) {\n   module.hot.accept(\"!!../node_modules/css-loader/dist/cjs.js!../node_modules/vue-loader/lib/loaders/stylePostLoader.js!../node_modules/vue-loader/lib/index.js??vue-loader-options!./Scanner.vue?vue&type=style&index=0&id=4ebacf15&scoped=true&lang=css&\", function() {\n     var newContent = require(\"!!../node_modules/css-loader/dist/cjs.js!../node_modules/vue-loader/lib/loaders/stylePostLoader.js!../node_modules/vue-loader/lib/index.js??vue-loader-options!./Scanner.vue?vue&type=style&index=0&id=4ebacf15&scoped=true&lang=css&\");\n     if(typeof newContent === 'string') newContent = [[module.id, newContent, '']];\n     update(newContent);\n   });\n }\n // When the module is disposed, remove the <style> tags\n module.hot.dispose(function() { update(); });\n}","/*\n *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n /* eslint-env node */\n'use strict';\n\nvar SDPUtils = require('sdp');\n\nfunction fixStatsType(stat) {\n  return {\n    inboundrtp: 'inbound-rtp',\n    outboundrtp: 'outbound-rtp',\n    candidatepair: 'candidate-pair',\n    localcandidate: 'local-candidate',\n    remotecandidate: 'remote-candidate'\n  }[stat.type] || stat.type;\n}\n\nfunction writeMediaSection(transceiver, caps, type, stream, dtlsRole) {\n  var sdp = SDPUtils.writeRtpDescription(transceiver.kind, caps);\n\n  // Map ICE parameters (ufrag, pwd) to SDP.\n  sdp += SDPUtils.writeIceParameters(\n      transceiver.iceGatherer.getLocalParameters());\n\n  // Map DTLS parameters to SDP.\n  sdp += SDPUtils.writeDtlsParameters(\n      transceiver.dtlsTransport.getLocalParameters(),\n      type === 'offer' ? 'actpass' : dtlsRole || 'active');\n\n  sdp += 'a=mid:' + transceiver.mid + '\\r\\n';\n\n  if (transceiver.rtpSender && transceiver.rtpReceiver) {\n    sdp += 'a=sendrecv\\r\\n';\n  } else if (transceiver.rtpSender) {\n    sdp += 'a=sendonly\\r\\n';\n  } else if (transceiver.rtpReceiver) {\n    sdp += 'a=recvonly\\r\\n';\n  } else {\n    sdp += 'a=inactive\\r\\n';\n  }\n\n  if (transceiver.rtpSender) {\n    var trackId = transceiver.rtpSender._initialTrackId ||\n        transceiver.rtpSender.track.id;\n    transceiver.rtpSender._initialTrackId = trackId;\n    // spec.\n    var msid = 'msid:' + (stream ? stream.id : '-') + ' ' +\n        trackId + '\\r\\n';\n    sdp += 'a=' + msid;\n    // for Chrome. Legacy should no longer be required.\n    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +\n        ' ' + msid;\n\n    // RTX\n    if (transceiver.sendEncodingParameters[0].rtx) {\n      sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +\n          ' ' + msid;\n      sdp += 'a=ssrc-group:FID ' +\n          transceiver.sendEncodingParameters[0].ssrc + ' ' +\n          transceiver.sendEncodingParameters[0].rtx.ssrc +\n          '\\r\\n';\n    }\n  }\n  // FIXME: this should be written by writeRtpDescription.\n  sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +\n      ' cname:' + SDPUtils.localCName + '\\r\\n';\n  if (transceiver.rtpSender && transceiver.sendEncodingParameters[0].rtx) {\n    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +\n        ' cname:' + SDPUtils.localCName + '\\r\\n';\n  }\n  return sdp;\n}\n\n// Edge does not like\n// 1) stun: filtered after 14393 unless ?transport=udp is present\n// 2) turn: that does not have all of turn:host:port?transport=udp\n// 3) turn: with ipv6 addresses\n// 4) turn: occurring muliple times\nfunction filterIceServers(iceServers, edgeVersion) {\n  var hasTurn = false;\n  iceServers = JSON.parse(JSON.stringify(iceServers));\n  return iceServers.filter(function(server) {\n    if (server && (server.urls || server.url)) {\n      var urls = server.urls || server.url;\n      if (server.url && !server.urls) {\n        console.warn('RTCIceServer.url is deprecated! Use urls instead.');\n      }\n      var isString = typeof urls === 'string';\n      if (isString) {\n        urls = [urls];\n      }\n      urls = urls.filter(function(url) {\n        var validTurn = url.indexOf('turn:') === 0 &&\n            url.indexOf('transport=udp') !== -1 &&\n            url.indexOf('turn:[') === -1 &&\n            !hasTurn;\n\n        if (validTurn) {\n          hasTurn = true;\n          return true;\n        }\n        return url.indexOf('stun:') === 0 && edgeVersion >= 14393 &&\n            url.indexOf('?transport=udp') === -1;\n      });\n\n      delete server.url;\n      server.urls = isString ? urls[0] : urls;\n      return !!urls.length;\n    }\n  });\n}\n\n// Determines the intersection of local and remote capabilities.\nfunction getCommonCapabilities(localCapabilities, remoteCapabilities) {\n  var commonCapabilities = {\n    codecs: [],\n    headerExtensions: [],\n    fecMechanisms: []\n  };\n\n  var findCodecByPayloadType = function(pt, codecs) {\n    pt = parseInt(pt, 10);\n    for (var i = 0; i < codecs.length; i++) {\n      if (codecs[i].payloadType === pt ||\n          codecs[i].preferredPayloadType === pt) {\n        return codecs[i];\n      }\n    }\n  };\n\n  var rtxCapabilityMatches = function(lRtx, rRtx, lCodecs, rCodecs) {\n    var lCodec = findCodecByPayloadType(lRtx.parameters.apt, lCodecs);\n    var rCodec = findCodecByPayloadType(rRtx.parameters.apt, rCodecs);\n    return lCodec && rCodec &&\n        lCodec.name.toLowerCase() === rCodec.name.toLowerCase();\n  };\n\n  localCapabilities.codecs.forEach(function(lCodec) {\n    for (var i = 0; i < remoteCapabilities.codecs.length; i++) {\n      var rCodec = remoteCapabilities.codecs[i];\n      if (lCodec.name.toLowerCase() === rCodec.name.toLowerCase() &&\n          lCodec.clockRate === rCodec.clockRate) {\n        if (lCodec.name.toLowerCase() === 'rtx' &&\n            lCodec.parameters && rCodec.parameters.apt) {\n          // for RTX we need to find the local rtx that has a apt\n          // which points to the same local codec as the remote one.\n          if (!rtxCapabilityMatches(lCodec, rCodec,\n              localCapabilities.codecs, remoteCapabilities.codecs)) {\n            continue;\n          }\n        }\n        rCodec = JSON.parse(JSON.stringify(rCodec)); // deepcopy\n        // number of channels is the highest common number of channels\n        rCodec.numChannels = Math.min(lCodec.numChannels,\n            rCodec.numChannels);\n        // push rCodec so we reply with offerer payload type\n        commonCapabilities.codecs.push(rCodec);\n\n        // determine common feedback mechanisms\n        rCodec.rtcpFeedback = rCodec.rtcpFeedback.filter(function(fb) {\n          for (var j = 0; j < lCodec.rtcpFeedback.length; j++) {\n            if (lCodec.rtcpFeedback[j].type === fb.type &&\n                lCodec.rtcpFeedback[j].parameter === fb.parameter) {\n              return true;\n            }\n          }\n          return false;\n        });\n        // FIXME: also need to determine .parameters\n        //  see https://github.com/openpeer/ortc/issues/569\n        break;\n      }\n    }\n  });\n\n  localCapabilities.headerExtensions.forEach(function(lHeaderExtension) {\n    for (var i = 0; i < remoteCapabilities.headerExtensions.length;\n         i++) {\n      var rHeaderExtension = remoteCapabilities.headerExtensions[i];\n      if (lHeaderExtension.uri === rHeaderExtension.uri) {\n        commonCapabilities.headerExtensions.push(rHeaderExtension);\n        break;\n      }\n    }\n  });\n\n  // FIXME: fecMechanisms\n  return commonCapabilities;\n}\n\n// is action=setLocalDescription with type allowed in signalingState\nfunction isActionAllowedInSignalingState(action, type, signalingState) {\n  return {\n    offer: {\n      setLocalDescription: ['stable', 'have-local-offer'],\n      setRemoteDescription: ['stable', 'have-remote-offer']\n    },\n    answer: {\n      setLocalDescription: ['have-remote-offer', 'have-local-pranswer'],\n      setRemoteDescription: ['have-local-offer', 'have-remote-pranswer']\n    }\n  }[type][action].indexOf(signalingState) !== -1;\n}\n\nfunction maybeAddCandidate(iceTransport, candidate) {\n  // Edge's internal representation adds some fields therefore\n  // not all fieldѕ are taken into account.\n  var alreadyAdded = iceTransport.getRemoteCandidates()\n      .find(function(remoteCandidate) {\n        return candidate.foundation === remoteCandidate.foundation &&\n            candidate.ip === remoteCandidate.ip &&\n            candidate.port === remoteCandidate.port &&\n            candidate.priority === remoteCandidate.priority &&\n            candidate.protocol === remoteCandidate.protocol &&\n            candidate.type === remoteCandidate.type;\n      });\n  if (!alreadyAdded) {\n    iceTransport.addRemoteCandidate(candidate);\n  }\n  return !alreadyAdded;\n}\n\n\nfunction makeError(name, description) {\n  var e = new Error(description);\n  e.name = name;\n  // legacy error codes from https://heycam.github.io/webidl/#idl-DOMException-error-names\n  e.code = {\n    NotSupportedError: 9,\n    InvalidStateError: 11,\n    InvalidAccessError: 15,\n    TypeError: undefined,\n    OperationError: undefined\n  }[name];\n  return e;\n}\n\nmodule.exports = function(window, edgeVersion) {\n  // https://w3c.github.io/mediacapture-main/#mediastream\n  // Helper function to add the track to the stream and\n  // dispatch the event ourselves.\n  function addTrackToStreamAndFireEvent(track, stream) {\n    stream.addTrack(track);\n    stream.dispatchEvent(new window.MediaStreamTrackEvent('addtrack',\n        {track: track}));\n  }\n\n  function removeTrackFromStreamAndFireEvent(track, stream) {\n    stream.removeTrack(track);\n    stream.dispatchEvent(new window.MediaStreamTrackEvent('removetrack',\n        {track: track}));\n  }\n\n  function fireAddTrack(pc, track, receiver, streams) {\n    var trackEvent = new Event('track');\n    trackEvent.track = track;\n    trackEvent.receiver = receiver;\n    trackEvent.transceiver = {receiver: receiver};\n    trackEvent.streams = streams;\n    window.setTimeout(function() {\n      pc._dispatchEvent('track', trackEvent);\n    });\n  }\n\n  var RTCPeerConnection = function(config) {\n    var pc = this;\n\n    var _eventTarget = document.createDocumentFragment();\n    ['addEventListener', 'removeEventListener', 'dispatchEvent']\n        .forEach(function(method) {\n          pc[method] = _eventTarget[method].bind(_eventTarget);\n        });\n\n    this.canTrickleIceCandidates = null;\n\n    this.needNegotiation = false;\n\n    this.localStreams = [];\n    this.remoteStreams = [];\n\n    this._localDescription = null;\n    this._remoteDescription = null;\n\n    this.signalingState = 'stable';\n    this.iceConnectionState = 'new';\n    this.connectionState = 'new';\n    this.iceGatheringState = 'new';\n\n    config = JSON.parse(JSON.stringify(config || {}));\n\n    this.usingBundle = config.bundlePolicy === 'max-bundle';\n    if (config.rtcpMuxPolicy === 'negotiate') {\n      throw(makeError('NotSupportedError',\n          'rtcpMuxPolicy \\'negotiate\\' is not supported'));\n    } else if (!config.rtcpMuxPolicy) {\n      config.rtcpMuxPolicy = 'require';\n    }\n\n    switch (config.iceTransportPolicy) {\n      case 'all':\n      case 'relay':\n        break;\n      default:\n        config.iceTransportPolicy = 'all';\n        break;\n    }\n\n    switch (config.bundlePolicy) {\n      case 'balanced':\n      case 'max-compat':\n      case 'max-bundle':\n        break;\n      default:\n        config.bundlePolicy = 'balanced';\n        break;\n    }\n\n    config.iceServers = filterIceServers(config.iceServers || [], edgeVersion);\n\n    this._iceGatherers = [];\n    if (config.iceCandidatePoolSize) {\n      for (var i = config.iceCandidatePoolSize; i > 0; i--) {\n        this._iceGatherers.push(new window.RTCIceGatherer({\n          iceServers: config.iceServers,\n          gatherPolicy: config.iceTransportPolicy\n        }));\n      }\n    } else {\n      config.iceCandidatePoolSize = 0;\n    }\n\n    this._config = config;\n\n    // per-track iceGathers, iceTransports, dtlsTransports, rtpSenders, ...\n    // everything that is needed to describe a SDP m-line.\n    this.transceivers = [];\n\n    this._sdpSessionId = SDPUtils.generateSessionId();\n    this._sdpSessionVersion = 0;\n\n    this._dtlsRole = undefined; // role for a=setup to use in answers.\n\n    this._isClosed = false;\n  };\n\n  Object.defineProperty(RTCPeerConnection.prototype, 'localDescription', {\n    configurable: true,\n    get: function() {\n      return this._localDescription;\n    }\n  });\n  Object.defineProperty(RTCPeerConnection.prototype, 'remoteDescription', {\n    configurable: true,\n    get: function() {\n      return this._remoteDescription;\n    }\n  });\n\n  // set up event handlers on prototype\n  RTCPeerConnection.prototype.onicecandidate = null;\n  RTCPeerConnection.prototype.onaddstream = null;\n  RTCPeerConnection.prototype.ontrack = null;\n  RTCPeerConnection.prototype.onremovestream = null;\n  RTCPeerConnection.prototype.onsignalingstatechange = null;\n  RTCPeerConnection.prototype.oniceconnectionstatechange = null;\n  RTCPeerConnection.prototype.onconnectionstatechange = null;\n  RTCPeerConnection.prototype.onicegatheringstatechange = null;\n  RTCPeerConnection.prototype.onnegotiationneeded = null;\n  RTCPeerConnection.prototype.ondatachannel = null;\n\n  RTCPeerConnection.prototype._dispatchEvent = function(name, event) {\n    if (this._isClosed) {\n      return;\n    }\n    this.dispatchEvent(event);\n    if (typeof this['on' + name] === 'function') {\n      this['on' + name](event);\n    }\n  };\n\n  RTCPeerConnection.prototype._emitGatheringStateChange = function() {\n    var event = new Event('icegatheringstatechange');\n    this._dispatchEvent('icegatheringstatechange', event);\n  };\n\n  RTCPeerConnection.prototype.getConfiguration = function() {\n    return this._config;\n  };\n\n  RTCPeerConnection.prototype.getLocalStreams = function() {\n    return this.localStreams;\n  };\n\n  RTCPeerConnection.prototype.getRemoteStreams = function() {\n    return this.remoteStreams;\n  };\n\n  // internal helper to create a transceiver object.\n  // (which is not yet the same as the WebRTC 1.0 transceiver)\n  RTCPeerConnection.prototype._createTransceiver = function(kind, doNotAdd) {\n    var hasBundleTransport = this.transceivers.length > 0;\n    var transceiver = {\n      track: null,\n      iceGatherer: null,\n      iceTransport: null,\n      dtlsTransport: null,\n      localCapabilities: null,\n      remoteCapabilities: null,\n      rtpSender: null,\n      rtpReceiver: null,\n      kind: kind,\n      mid: null,\n      sendEncodingParameters: null,\n      recvEncodingParameters: null,\n      stream: null,\n      associatedRemoteMediaStreams: [],\n      wantReceive: true\n    };\n    if (this.usingBundle && hasBundleTransport) {\n      transceiver.iceTransport = this.transceivers[0].iceTransport;\n      transceiver.dtlsTransport = this.transceivers[0].dtlsTransport;\n    } else {\n      var transports = this._createIceAndDtlsTransports();\n      transceiver.iceTransport = transports.iceTransport;\n      transceiver.dtlsTransport = transports.dtlsTransport;\n    }\n    if (!doNotAdd) {\n      this.transceivers.push(transceiver);\n    }\n    return transceiver;\n  };\n\n  RTCPeerConnection.prototype.addTrack = function(track, stream) {\n    if (this._isClosed) {\n      throw makeError('InvalidStateError',\n          'Attempted to call addTrack on a closed peerconnection.');\n    }\n\n    var alreadyExists = this.transceivers.find(function(s) {\n      return s.track === track;\n    });\n\n    if (alreadyExists) {\n      throw makeError('InvalidAccessError', 'Track already exists.');\n    }\n\n    var transceiver;\n    for (var i = 0; i < this.transceivers.length; i++) {\n      if (!this.transceivers[i].track &&\n          this.transceivers[i].kind === track.kind) {\n        transceiver = this.transceivers[i];\n      }\n    }\n    if (!transceiver) {\n      transceiver = this._createTransceiver(track.kind);\n    }\n\n    this._maybeFireNegotiationNeeded();\n\n    if (this.localStreams.indexOf(stream) === -1) {\n      this.localStreams.push(stream);\n    }\n\n    transceiver.track = track;\n    transceiver.stream = stream;\n    transceiver.rtpSender = new window.RTCRtpSender(track,\n        transceiver.dtlsTransport);\n    return transceiver.rtpSender;\n  };\n\n  RTCPeerConnection.prototype.addStream = function(stream) {\n    var pc = this;\n    if (edgeVersion >= 15025) {\n      stream.getTracks().forEach(function(track) {\n        pc.addTrack(track, stream);\n      });\n    } else {\n      // Clone is necessary for local demos mostly, attaching directly\n      // to two different senders does not work (build 10547).\n      // Fixed in 15025 (or earlier)\n      var clonedStream = stream.clone();\n      stream.getTracks().forEach(function(track, idx) {\n        var clonedTrack = clonedStream.getTracks()[idx];\n        track.addEventListener('enabled', function(event) {\n          clonedTrack.enabled = event.enabled;\n        });\n      });\n      clonedStream.getTracks().forEach(function(track) {\n        pc.addTrack(track, clonedStream);\n      });\n    }\n  };\n\n  RTCPeerConnection.prototype.removeTrack = function(sender) {\n    if (this._isClosed) {\n      throw makeError('InvalidStateError',\n          'Attempted to call removeTrack on a closed peerconnection.');\n    }\n\n    if (!(sender instanceof window.RTCRtpSender)) {\n      throw new TypeError('Argument 1 of RTCPeerConnection.removeTrack ' +\n          'does not implement interface RTCRtpSender.');\n    }\n\n    var transceiver = this.transceivers.find(function(t) {\n      return t.rtpSender === sender;\n    });\n\n    if (!transceiver) {\n      throw makeError('InvalidAccessError',\n          'Sender was not created by this connection.');\n    }\n    var stream = transceiver.stream;\n\n    transceiver.rtpSender.stop();\n    transceiver.rtpSender = null;\n    transceiver.track = null;\n    transceiver.stream = null;\n\n    // remove the stream from the set of local streams\n    var localStreams = this.transceivers.map(function(t) {\n      return t.stream;\n    });\n    if (localStreams.indexOf(stream) === -1 &&\n        this.localStreams.indexOf(stream) > -1) {\n      this.localStreams.splice(this.localStreams.indexOf(stream), 1);\n    }\n\n    this._maybeFireNegotiationNeeded();\n  };\n\n  RTCPeerConnection.prototype.removeStream = function(stream) {\n    var pc = this;\n    stream.getTracks().forEach(function(track) {\n      var sender = pc.getSenders().find(function(s) {\n        return s.track === track;\n      });\n      if (sender) {\n        pc.removeTrack(sender);\n      }\n    });\n  };\n\n  RTCPeerConnection.prototype.getSenders = function() {\n    return this.transceivers.filter(function(transceiver) {\n      return !!transceiver.rtpSender;\n    })\n    .map(function(transceiver) {\n      return transceiver.rtpSender;\n    });\n  };\n\n  RTCPeerConnection.prototype.getReceivers = function() {\n    return this.transceivers.filter(function(transceiver) {\n      return !!transceiver.rtpReceiver;\n    })\n    .map(function(transceiver) {\n      return transceiver.rtpReceiver;\n    });\n  };\n\n\n  RTCPeerConnection.prototype._createIceGatherer = function(sdpMLineIndex,\n      usingBundle) {\n    var pc = this;\n    if (usingBundle && sdpMLineIndex > 0) {\n      return this.transceivers[0].iceGatherer;\n    } else if (this._iceGatherers.length) {\n      return this._iceGatherers.shift();\n    }\n    var iceGatherer = new window.RTCIceGatherer({\n      iceServers: this._config.iceServers,\n      gatherPolicy: this._config.iceTransportPolicy\n    });\n    Object.defineProperty(iceGatherer, 'state',\n        {value: 'new', writable: true}\n    );\n\n    this.transceivers[sdpMLineIndex].bufferedCandidateEvents = [];\n    this.transceivers[sdpMLineIndex].bufferCandidates = function(event) {\n      var end = !event.candidate || Object.keys(event.candidate).length === 0;\n      // polyfill since RTCIceGatherer.state is not implemented in\n      // Edge 10547 yet.\n      iceGatherer.state = end ? 'completed' : 'gathering';\n      if (pc.transceivers[sdpMLineIndex].bufferedCandidateEvents !== null) {\n        pc.transceivers[sdpMLineIndex].bufferedCandidateEvents.push(event);\n      }\n    };\n    iceGatherer.addEventListener('localcandidate',\n      this.transceivers[sdpMLineIndex].bufferCandidates);\n    return iceGatherer;\n  };\n\n  // start gathering from an RTCIceGatherer.\n  RTCPeerConnection.prototype._gather = function(mid, sdpMLineIndex) {\n    var pc = this;\n    var iceGatherer = this.transceivers[sdpMLineIndex].iceGatherer;\n    if (iceGatherer.onlocalcandidate) {\n      return;\n    }\n    var bufferedCandidateEvents =\n      this.transceivers[sdpMLineIndex].bufferedCandidateEvents;\n    this.transceivers[sdpMLineIndex].bufferedCandidateEvents = null;\n    iceGatherer.removeEventListener('localcandidate',\n      this.transceivers[sdpMLineIndex].bufferCandidates);\n    iceGatherer.onlocalcandidate = function(evt) {\n      if (pc.usingBundle && sdpMLineIndex > 0) {\n        // if we know that we use bundle we can drop candidates with\n        // ѕdpMLineIndex > 0. If we don't do this then our state gets\n        // confused since we dispose the extra ice gatherer.\n        return;\n      }\n      var event = new Event('icecandidate');\n      event.candidate = {sdpMid: mid, sdpMLineIndex: sdpMLineIndex};\n\n      var cand = evt.candidate;\n      // Edge emits an empty object for RTCIceCandidateComplete‥\n      var end = !cand || Object.keys(cand).length === 0;\n      if (end) {\n        // polyfill since RTCIceGatherer.state is not implemented in\n        // Edge 10547 yet.\n        if (iceGatherer.state === 'new' || iceGatherer.state === 'gathering') {\n          iceGatherer.state = 'completed';\n        }\n      } else {\n        if (iceGatherer.state === 'new') {\n          iceGatherer.state = 'gathering';\n        }\n        // RTCIceCandidate doesn't have a component, needs to be added\n        cand.component = 1;\n        // also the usernameFragment. TODO: update SDP to take both variants.\n        cand.ufrag = iceGatherer.getLocalParameters().usernameFragment;\n\n        var serializedCandidate = SDPUtils.writeCandidate(cand);\n        event.candidate = Object.assign(event.candidate,\n            SDPUtils.parseCandidate(serializedCandidate));\n\n        event.candidate.candidate = serializedCandidate;\n        event.candidate.toJSON = function() {\n          return {\n            candidate: event.candidate.candidate,\n            sdpMid: event.candidate.sdpMid,\n            sdpMLineIndex: event.candidate.sdpMLineIndex,\n            usernameFragment: event.candidate.usernameFragment\n          };\n        };\n      }\n\n      // update local description.\n      var sections = SDPUtils.getMediaSections(pc._localDescription.sdp);\n      if (!end) {\n        sections[event.candidate.sdpMLineIndex] +=\n            'a=' + event.candidate.candidate + '\\r\\n';\n      } else {\n        sections[event.candidate.sdpMLineIndex] +=\n            'a=end-of-candidates\\r\\n';\n      }\n      pc._localDescription.sdp =\n          SDPUtils.getDescription(pc._localDescription.sdp) +\n          sections.join('');\n      var complete = pc.transceivers.every(function(transceiver) {\n        return transceiver.iceGatherer &&\n            transceiver.iceGatherer.state === 'completed';\n      });\n\n      if (pc.iceGatheringState !== 'gathering') {\n        pc.iceGatheringState = 'gathering';\n        pc._emitGatheringStateChange();\n      }\n\n      // Emit candidate. Also emit null candidate when all gatherers are\n      // complete.\n      if (!end) {\n        pc._dispatchEvent('icecandidate', event);\n      }\n      if (complete) {\n        pc._dispatchEvent('icecandidate', new Event('icecandidate'));\n        pc.iceGatheringState = 'complete';\n        pc._emitGatheringStateChange();\n      }\n    };\n\n    // emit already gathered candidates.\n    window.setTimeout(function() {\n      bufferedCandidateEvents.forEach(function(e) {\n        iceGatherer.onlocalcandidate(e);\n      });\n    }, 0);\n  };\n\n  // Create ICE transport and DTLS transport.\n  RTCPeerConnection.prototype._createIceAndDtlsTransports = function() {\n    var pc = this;\n    var iceTransport = new window.RTCIceTransport(null);\n    iceTransport.onicestatechange = function() {\n      pc._updateIceConnectionState();\n      pc._updateConnectionState();\n    };\n\n    var dtlsTransport = new window.RTCDtlsTransport(iceTransport);\n    dtlsTransport.ondtlsstatechange = function() {\n      pc._updateConnectionState();\n    };\n    dtlsTransport.onerror = function() {\n      // onerror does not set state to failed by itself.\n      Object.defineProperty(dtlsTransport, 'state',\n          {value: 'failed', writable: true});\n      pc._updateConnectionState();\n    };\n\n    return {\n      iceTransport: iceTransport,\n      dtlsTransport: dtlsTransport\n    };\n  };\n\n  // Destroy ICE gatherer, ICE transport and DTLS transport.\n  // Without triggering the callbacks.\n  RTCPeerConnection.prototype._disposeIceAndDtlsTransports = function(\n      sdpMLineIndex) {\n    var iceGatherer = this.transceivers[sdpMLineIndex].iceGatherer;\n    if (iceGatherer) {\n      delete iceGatherer.onlocalcandidate;\n      delete this.transceivers[sdpMLineIndex].iceGatherer;\n    }\n    var iceTransport = this.transceivers[sdpMLineIndex].iceTransport;\n    if (iceTransport) {\n      delete iceTransport.onicestatechange;\n      delete this.transceivers[sdpMLineIndex].iceTransport;\n    }\n    var dtlsTransport = this.transceivers[sdpMLineIndex].dtlsTransport;\n    if (dtlsTransport) {\n      delete dtlsTransport.ondtlsstatechange;\n      delete dtlsTransport.onerror;\n      delete this.transceivers[sdpMLineIndex].dtlsTransport;\n    }\n  };\n\n  // Start the RTP Sender and Receiver for a transceiver.\n  RTCPeerConnection.prototype._transceive = function(transceiver,\n      send, recv) {\n    var params = getCommonCapabilities(transceiver.localCapabilities,\n        transceiver.remoteCapabilities);\n    if (send && transceiver.rtpSender) {\n      params.encodings = transceiver.sendEncodingParameters;\n      params.rtcp = {\n        cname: SDPUtils.localCName,\n        compound: transceiver.rtcpParameters.compound\n      };\n      if (transceiver.recvEncodingParameters.length) {\n        params.rtcp.ssrc = transceiver.recvEncodingParameters[0].ssrc;\n      }\n      transceiver.rtpSender.send(params);\n    }\n    if (recv && transceiver.rtpReceiver && params.codecs.length > 0) {\n      // remove RTX field in Edge 14942\n      if (transceiver.kind === 'video'\n          && transceiver.recvEncodingParameters\n          && edgeVersion < 15019) {\n        transceiver.recvEncodingParameters.forEach(function(p) {\n          delete p.rtx;\n        });\n      }\n      if (transceiver.recvEncodingParameters.length) {\n        params.encodings = transceiver.recvEncodingParameters;\n      } else {\n        params.encodings = [{}];\n      }\n      params.rtcp = {\n        compound: transceiver.rtcpParameters.compound\n      };\n      if (transceiver.rtcpParameters.cname) {\n        params.rtcp.cname = transceiver.rtcpParameters.cname;\n      }\n      if (transceiver.sendEncodingParameters.length) {\n        params.rtcp.ssrc = transceiver.sendEncodingParameters[0].ssrc;\n      }\n      transceiver.rtpReceiver.receive(params);\n    }\n  };\n\n  RTCPeerConnection.prototype.setLocalDescription = function(description) {\n    var pc = this;\n\n    // Note: pranswer is not supported.\n    if (['offer', 'answer'].indexOf(description.type) === -1) {\n      return Promise.reject(makeError('TypeError',\n          'Unsupported type \"' + description.type + '\"'));\n    }\n\n    if (!isActionAllowedInSignalingState('setLocalDescription',\n        description.type, pc.signalingState) || pc._isClosed) {\n      return Promise.reject(makeError('InvalidStateError',\n          'Can not set local ' + description.type +\n          ' in state ' + pc.signalingState));\n    }\n\n    var sections;\n    var sessionpart;\n    if (description.type === 'offer') {\n      // VERY limited support for SDP munging. Limited to:\n      // * changing the order of codecs\n      sections = SDPUtils.splitSections(description.sdp);\n      sessionpart = sections.shift();\n      sections.forEach(function(mediaSection, sdpMLineIndex) {\n        var caps = SDPUtils.parseRtpParameters(mediaSection);\n        pc.transceivers[sdpMLineIndex].localCapabilities = caps;\n      });\n\n      pc.transceivers.forEach(function(transceiver, sdpMLineIndex) {\n        pc._gather(transceiver.mid, sdpMLineIndex);\n      });\n    } else if (description.type === 'answer') {\n      sections = SDPUtils.splitSections(pc._remoteDescription.sdp);\n      sessionpart = sections.shift();\n      var isIceLite = SDPUtils.matchPrefix(sessionpart,\n          'a=ice-lite').length > 0;\n      sections.forEach(function(mediaSection, sdpMLineIndex) {\n        var transceiver = pc.transceivers[sdpMLineIndex];\n        var iceGatherer = transceiver.iceGatherer;\n        var iceTransport = transceiver.iceTransport;\n        var dtlsTransport = transceiver.dtlsTransport;\n        var localCapabilities = transceiver.localCapabilities;\n        var remoteCapabilities = transceiver.remoteCapabilities;\n\n        // treat bundle-only as not-rejected.\n        var rejected = SDPUtils.isRejected(mediaSection) &&\n            SDPUtils.matchPrefix(mediaSection, 'a=bundle-only').length === 0;\n\n        if (!rejected && !transceiver.rejected) {\n          var remoteIceParameters = SDPUtils.getIceParameters(\n              mediaSection, sessionpart);\n          var remoteDtlsParameters = SDPUtils.getDtlsParameters(\n              mediaSection, sessionpart);\n          if (isIceLite) {\n            remoteDtlsParameters.role = 'server';\n          }\n\n          if (!pc.usingBundle || sdpMLineIndex === 0) {\n            pc._gather(transceiver.mid, sdpMLineIndex);\n            if (iceTransport.state === 'new') {\n              iceTransport.start(iceGatherer, remoteIceParameters,\n                  isIceLite ? 'controlling' : 'controlled');\n            }\n            if (dtlsTransport.state === 'new') {\n              dtlsTransport.start(remoteDtlsParameters);\n            }\n          }\n\n          // Calculate intersection of capabilities.\n          var params = getCommonCapabilities(localCapabilities,\n              remoteCapabilities);\n\n          // Start the RTCRtpSender. The RTCRtpReceiver for this\n          // transceiver has already been started in setRemoteDescription.\n          pc._transceive(transceiver,\n              params.codecs.length > 0,\n              false);\n        }\n      });\n    }\n\n    pc._localDescription = {\n      type: description.type,\n      sdp: description.sdp\n    };\n    if (description.type === 'offer') {\n      pc._updateSignalingState('have-local-offer');\n    } else {\n      pc._updateSignalingState('stable');\n    }\n\n    return Promise.resolve();\n  };\n\n  RTCPeerConnection.prototype.setRemoteDescription = function(description) {\n    var pc = this;\n\n    // Note: pranswer is not supported.\n    if (['offer', 'answer'].indexOf(description.type) === -1) {\n      return Promise.reject(makeError('TypeError',\n          'Unsupported type \"' + description.type + '\"'));\n    }\n\n    if (!isActionAllowedInSignalingState('setRemoteDescription',\n        description.type, pc.signalingState) || pc._isClosed) {\n      return Promise.reject(makeError('InvalidStateError',\n          'Can not set remote ' + description.type +\n          ' in state ' + pc.signalingState));\n    }\n\n    var streams = {};\n    pc.remoteStreams.forEach(function(stream) {\n      streams[stream.id] = stream;\n    });\n    var receiverList = [];\n    var sections = SDPUtils.splitSections(description.sdp);\n    var sessionpart = sections.shift();\n    var isIceLite = SDPUtils.matchPrefix(sessionpart,\n        'a=ice-lite').length > 0;\n    var usingBundle = SDPUtils.matchPrefix(sessionpart,\n        'a=group:BUNDLE ').length > 0;\n    pc.usingBundle = usingBundle;\n    var iceOptions = SDPUtils.matchPrefix(sessionpart,\n        'a=ice-options:')[0];\n    if (iceOptions) {\n      pc.canTrickleIceCandidates = iceOptions.substr(14).split(' ')\n          .indexOf('trickle') >= 0;\n    } else {\n      pc.canTrickleIceCandidates = false;\n    }\n\n    sections.forEach(function(mediaSection, sdpMLineIndex) {\n      var lines = SDPUtils.splitLines(mediaSection);\n      var kind = SDPUtils.getKind(mediaSection);\n      // treat bundle-only as not-rejected.\n      var rejected = SDPUtils.isRejected(mediaSection) &&\n          SDPUtils.matchPrefix(mediaSection, 'a=bundle-only').length === 0;\n      var protocol = lines[0].substr(2).split(' ')[2];\n\n      var direction = SDPUtils.getDirection(mediaSection, sessionpart);\n      var remoteMsid = SDPUtils.parseMsid(mediaSection);\n\n      var mid = SDPUtils.getMid(mediaSection) || SDPUtils.generateIdentifier();\n\n      // Reject datachannels which are not implemented yet.\n      if (rejected || (kind === 'application' && (protocol === 'DTLS/SCTP' ||\n          protocol === 'UDP/DTLS/SCTP'))) {\n        // TODO: this is dangerous in the case where a non-rejected m-line\n        //     becomes rejected.\n        pc.transceivers[sdpMLineIndex] = {\n          mid: mid,\n          kind: kind,\n          protocol: protocol,\n          rejected: true\n        };\n        return;\n      }\n\n      if (!rejected && pc.transceivers[sdpMLineIndex] &&\n          pc.transceivers[sdpMLineIndex].rejected) {\n        // recycle a rejected transceiver.\n        pc.transceivers[sdpMLineIndex] = pc._createTransceiver(kind, true);\n      }\n\n      var transceiver;\n      var iceGatherer;\n      var iceTransport;\n      var dtlsTransport;\n      var rtpReceiver;\n      var sendEncodingParameters;\n      var recvEncodingParameters;\n      var localCapabilities;\n\n      var track;\n      // FIXME: ensure the mediaSection has rtcp-mux set.\n      var remoteCapabilities = SDPUtils.parseRtpParameters(mediaSection);\n      var remoteIceParameters;\n      var remoteDtlsParameters;\n      if (!rejected) {\n        remoteIceParameters = SDPUtils.getIceParameters(mediaSection,\n            sessionpart);\n        remoteDtlsParameters = SDPUtils.getDtlsParameters(mediaSection,\n            sessionpart);\n        remoteDtlsParameters.role = 'client';\n      }\n      recvEncodingParameters =\n          SDPUtils.parseRtpEncodingParameters(mediaSection);\n\n      var rtcpParameters = SDPUtils.parseRtcpParameters(mediaSection);\n\n      var isComplete = SDPUtils.matchPrefix(mediaSection,\n          'a=end-of-candidates', sessionpart).length > 0;\n      var cands = SDPUtils.matchPrefix(mediaSection, 'a=candidate:')\n          .map(function(cand) {\n            return SDPUtils.parseCandidate(cand);\n          })\n          .filter(function(cand) {\n            return cand.component === 1;\n          });\n\n      // Check if we can use BUNDLE and dispose transports.\n      if ((description.type === 'offer' || description.type === 'answer') &&\n          !rejected && usingBundle && sdpMLineIndex > 0 &&\n          pc.transceivers[sdpMLineIndex]) {\n        pc._disposeIceAndDtlsTransports(sdpMLineIndex);\n        pc.transceivers[sdpMLineIndex].iceGatherer =\n            pc.transceivers[0].iceGatherer;\n        pc.transceivers[sdpMLineIndex].iceTransport =\n            pc.transceivers[0].iceTransport;\n        pc.transceivers[sdpMLineIndex].dtlsTransport =\n            pc.transceivers[0].dtlsTransport;\n        if (pc.transceivers[sdpMLineIndex].rtpSender) {\n          pc.transceivers[sdpMLineIndex].rtpSender.setTransport(\n              pc.transceivers[0].dtlsTransport);\n        }\n        if (pc.transceivers[sdpMLineIndex].rtpReceiver) {\n          pc.transceivers[sdpMLineIndex].rtpReceiver.setTransport(\n              pc.transceivers[0].dtlsTransport);\n        }\n      }\n      if (description.type === 'offer' && !rejected) {\n        transceiver = pc.transceivers[sdpMLineIndex] ||\n            pc._createTransceiver(kind);\n        transceiver.mid = mid;\n\n        if (!transceiver.iceGatherer) {\n          transceiver.iceGatherer = pc._createIceGatherer(sdpMLineIndex,\n              usingBundle);\n        }\n\n        if (cands.length && transceiver.iceTransport.state === 'new') {\n          if (isComplete && (!usingBundle || sdpMLineIndex === 0)) {\n            transceiver.iceTransport.setRemoteCandidates(cands);\n          } else {\n            cands.forEach(function(candidate) {\n              maybeAddCandidate(transceiver.iceTransport, candidate);\n            });\n          }\n        }\n\n        localCapabilities = window.RTCRtpReceiver.getCapabilities(kind);\n\n        // filter RTX until additional stuff needed for RTX is implemented\n        // in adapter.js\n        if (edgeVersion < 15019) {\n          localCapabilities.codecs = localCapabilities.codecs.filter(\n              function(codec) {\n                return codec.name !== 'rtx';\n              });\n        }\n\n        sendEncodingParameters = transceiver.sendEncodingParameters || [{\n          ssrc: (2 * sdpMLineIndex + 2) * 1001\n        }];\n\n        // TODO: rewrite to use http://w3c.github.io/webrtc-pc/#set-associated-remote-streams\n        var isNewTrack = false;\n        if (direction === 'sendrecv' || direction === 'sendonly') {\n          isNewTrack = !transceiver.rtpReceiver;\n          rtpReceiver = transceiver.rtpReceiver ||\n              new window.RTCRtpReceiver(transceiver.dtlsTransport, kind);\n\n          if (isNewTrack) {\n            var stream;\n            track = rtpReceiver.track;\n            // FIXME: does not work with Plan B.\n            if (remoteMsid && remoteMsid.stream === '-') {\n              // no-op. a stream id of '-' means: no associated stream.\n            } else if (remoteMsid) {\n              if (!streams[remoteMsid.stream]) {\n                streams[remoteMsid.stream] = new window.MediaStream();\n                Object.defineProperty(streams[remoteMsid.stream], 'id', {\n                  get: function() {\n                    return remoteMsid.stream;\n                  }\n                });\n              }\n              Object.defineProperty(track, 'id', {\n                get: function() {\n                  return remoteMsid.track;\n                }\n              });\n              stream = streams[remoteMsid.stream];\n            } else {\n              if (!streams.default) {\n                streams.default = new window.MediaStream();\n              }\n              stream = streams.default;\n            }\n            if (stream) {\n              addTrackToStreamAndFireEvent(track, stream);\n              transceiver.associatedRemoteMediaStreams.push(stream);\n            }\n            receiverList.push([track, rtpReceiver, stream]);\n          }\n        } else if (transceiver.rtpReceiver && transceiver.rtpReceiver.track) {\n          transceiver.associatedRemoteMediaStreams.forEach(function(s) {\n            var nativeTrack = s.getTracks().find(function(t) {\n              return t.id === transceiver.rtpReceiver.track.id;\n            });\n            if (nativeTrack) {\n              removeTrackFromStreamAndFireEvent(nativeTrack, s);\n            }\n          });\n          transceiver.associatedRemoteMediaStreams = [];\n        }\n\n        transceiver.localCapabilities = localCapabilities;\n        transceiver.remoteCapabilities = remoteCapabilities;\n        transceiver.rtpReceiver = rtpReceiver;\n        transceiver.rtcpParameters = rtcpParameters;\n        transceiver.sendEncodingParameters = sendEncodingParameters;\n        transceiver.recvEncodingParameters = recvEncodingParameters;\n\n        // Start the RTCRtpReceiver now. The RTPSender is started in\n        // setLocalDescription.\n        pc._transceive(pc.transceivers[sdpMLineIndex],\n            false,\n            isNewTrack);\n      } else if (description.type === 'answer' && !rejected) {\n        transceiver = pc.transceivers[sdpMLineIndex];\n        iceGatherer = transceiver.iceGatherer;\n        iceTransport = transceiver.iceTransport;\n        dtlsTransport = transceiver.dtlsTransport;\n        rtpReceiver = transceiver.rtpReceiver;\n        sendEncodingParameters = transceiver.sendEncodingParameters;\n        localCapabilities = transceiver.localCapabilities;\n\n        pc.transceivers[sdpMLineIndex].recvEncodingParameters =\n            recvEncodingParameters;\n        pc.transceivers[sdpMLineIndex].remoteCapabilities =\n            remoteCapabilities;\n        pc.transceivers[sdpMLineIndex].rtcpParameters = rtcpParameters;\n\n        if (cands.length && iceTransport.state === 'new') {\n          if ((isIceLite || isComplete) &&\n              (!usingBundle || sdpMLineIndex === 0)) {\n            iceTransport.setRemoteCandidates(cands);\n          } else {\n            cands.forEach(function(candidate) {\n              maybeAddCandidate(transceiver.iceTransport, candidate);\n            });\n          }\n        }\n\n        if (!usingBundle || sdpMLineIndex === 0) {\n          if (iceTransport.state === 'new') {\n            iceTransport.start(iceGatherer, remoteIceParameters,\n                'controlling');\n          }\n          if (dtlsTransport.state === 'new') {\n            dtlsTransport.start(remoteDtlsParameters);\n          }\n        }\n\n        // If the offer contained RTX but the answer did not,\n        // remove RTX from sendEncodingParameters.\n        var commonCapabilities = getCommonCapabilities(\n          transceiver.localCapabilities,\n          transceiver.remoteCapabilities);\n\n        var hasRtx = commonCapabilities.codecs.filter(function(c) {\n          return c.name.toLowerCase() === 'rtx';\n        }).length;\n        if (!hasRtx && transceiver.sendEncodingParameters[0].rtx) {\n          delete transceiver.sendEncodingParameters[0].rtx;\n        }\n\n        pc._transceive(transceiver,\n            direction === 'sendrecv' || direction === 'recvonly',\n            direction === 'sendrecv' || direction === 'sendonly');\n\n        // TODO: rewrite to use http://w3c.github.io/webrtc-pc/#set-associated-remote-streams\n        if (rtpReceiver &&\n            (direction === 'sendrecv' || direction === 'sendonly')) {\n          track = rtpReceiver.track;\n          if (remoteMsid) {\n            if (!streams[remoteMsid.stream]) {\n              streams[remoteMsid.stream] = new window.MediaStream();\n            }\n            addTrackToStreamAndFireEvent(track, streams[remoteMsid.stream]);\n            receiverList.push([track, rtpReceiver, streams[remoteMsid.stream]]);\n          } else {\n            if (!streams.default) {\n              streams.default = new window.MediaStream();\n            }\n            addTrackToStreamAndFireEvent(track, streams.default);\n            receiverList.push([track, rtpReceiver, streams.default]);\n          }\n        } else {\n          // FIXME: actually the receiver should be created later.\n          delete transceiver.rtpReceiver;\n        }\n      }\n    });\n\n    if (pc._dtlsRole === undefined) {\n      pc._dtlsRole = description.type === 'offer' ? 'active' : 'passive';\n    }\n\n    pc._remoteDescription = {\n      type: description.type,\n      sdp: description.sdp\n    };\n    if (description.type === 'offer') {\n      pc._updateSignalingState('have-remote-offer');\n    } else {\n      pc._updateSignalingState('stable');\n    }\n    Object.keys(streams).forEach(function(sid) {\n      var stream = streams[sid];\n      if (stream.getTracks().length) {\n        if (pc.remoteStreams.indexOf(stream) === -1) {\n          pc.remoteStreams.push(stream);\n          var event = new Event('addstream');\n          event.stream = stream;\n          window.setTimeout(function() {\n            pc._dispatchEvent('addstream', event);\n          });\n        }\n\n        receiverList.forEach(function(item) {\n          var track = item[0];\n          var receiver = item[1];\n          if (stream.id !== item[2].id) {\n            return;\n          }\n          fireAddTrack(pc, track, receiver, [stream]);\n        });\n      }\n    });\n    receiverList.forEach(function(item) {\n      if (item[2]) {\n        return;\n      }\n      fireAddTrack(pc, item[0], item[1], []);\n    });\n\n    // check whether addIceCandidate({}) was called within four seconds after\n    // setRemoteDescription.\n    window.setTimeout(function() {\n      if (!(pc && pc.transceivers)) {\n        return;\n      }\n      pc.transceivers.forEach(function(transceiver) {\n        if (transceiver.iceTransport &&\n            transceiver.iceTransport.state === 'new' &&\n            transceiver.iceTransport.getRemoteCandidates().length > 0) {\n          console.warn('Timeout for addRemoteCandidate. Consider sending ' +\n              'an end-of-candidates notification');\n          transceiver.iceTransport.addRemoteCandidate({});\n        }\n      });\n    }, 4000);\n\n    return Promise.resolve();\n  };\n\n  RTCPeerConnection.prototype.close = function() {\n    this.transceivers.forEach(function(transceiver) {\n      /* not yet\n      if (transceiver.iceGatherer) {\n        transceiver.iceGatherer.close();\n      }\n      */\n      if (transceiver.iceTransport) {\n        transceiver.iceTransport.stop();\n      }\n      if (transceiver.dtlsTransport) {\n        transceiver.dtlsTransport.stop();\n      }\n      if (transceiver.rtpSender) {\n        transceiver.rtpSender.stop();\n      }\n      if (transceiver.rtpReceiver) {\n        transceiver.rtpReceiver.stop();\n      }\n    });\n    // FIXME: clean up tracks, local streams, remote streams, etc\n    this._isClosed = true;\n    this._updateSignalingState('closed');\n  };\n\n  // Update the signaling state.\n  RTCPeerConnection.prototype._updateSignalingState = function(newState) {\n    this.signalingState = newState;\n    var event = new Event('signalingstatechange');\n    this._dispatchEvent('signalingstatechange', event);\n  };\n\n  // Determine whether to fire the negotiationneeded event.\n  RTCPeerConnection.prototype._maybeFireNegotiationNeeded = function() {\n    var pc = this;\n    if (this.signalingState !== 'stable' || this.needNegotiation === true) {\n      return;\n    }\n    this.needNegotiation = true;\n    window.setTimeout(function() {\n      if (pc.needNegotiation) {\n        pc.needNegotiation = false;\n        var event = new Event('negotiationneeded');\n        pc._dispatchEvent('negotiationneeded', event);\n      }\n    }, 0);\n  };\n\n  // Update the ice connection state.\n  RTCPeerConnection.prototype._updateIceConnectionState = function() {\n    var newState;\n    var states = {\n      'new': 0,\n      closed: 0,\n      checking: 0,\n      connected: 0,\n      completed: 0,\n      disconnected: 0,\n      failed: 0\n    };\n    this.transceivers.forEach(function(transceiver) {\n      if (transceiver.iceTransport && !transceiver.rejected) {\n        states[transceiver.iceTransport.state]++;\n      }\n    });\n\n    newState = 'new';\n    if (states.failed > 0) {\n      newState = 'failed';\n    } else if (states.checking > 0) {\n      newState = 'checking';\n    } else if (states.disconnected > 0) {\n      newState = 'disconnected';\n    } else if (states.new > 0) {\n      newState = 'new';\n    } else if (states.connected > 0) {\n      newState = 'connected';\n    } else if (states.completed > 0) {\n      newState = 'completed';\n    }\n\n    if (newState !== this.iceConnectionState) {\n      this.iceConnectionState = newState;\n      var event = new Event('iceconnectionstatechange');\n      this._dispatchEvent('iceconnectionstatechange', event);\n    }\n  };\n\n  // Update the connection state.\n  RTCPeerConnection.prototype._updateConnectionState = function() {\n    var newState;\n    var states = {\n      'new': 0,\n      closed: 0,\n      connecting: 0,\n      connected: 0,\n      completed: 0,\n      disconnected: 0,\n      failed: 0\n    };\n    this.transceivers.forEach(function(transceiver) {\n      if (transceiver.iceTransport && transceiver.dtlsTransport &&\n          !transceiver.rejected) {\n        states[transceiver.iceTransport.state]++;\n        states[transceiver.dtlsTransport.state]++;\n      }\n    });\n    // ICETransport.completed and connected are the same for this purpose.\n    states.connected += states.completed;\n\n    newState = 'new';\n    if (states.failed > 0) {\n      newState = 'failed';\n    } else if (states.connecting > 0) {\n      newState = 'connecting';\n    } else if (states.disconnected > 0) {\n      newState = 'disconnected';\n    } else if (states.new > 0) {\n      newState = 'new';\n    } else if (states.connected > 0) {\n      newState = 'connected';\n    }\n\n    if (newState !== this.connectionState) {\n      this.connectionState = newState;\n      var event = new Event('connectionstatechange');\n      this._dispatchEvent('connectionstatechange', event);\n    }\n  };\n\n  RTCPeerConnection.prototype.createOffer = function() {\n    var pc = this;\n\n    if (pc._isClosed) {\n      return Promise.reject(makeError('InvalidStateError',\n          'Can not call createOffer after close'));\n    }\n\n    var numAudioTracks = pc.transceivers.filter(function(t) {\n      return t.kind === 'audio';\n    }).length;\n    var numVideoTracks = pc.transceivers.filter(function(t) {\n      return t.kind === 'video';\n    }).length;\n\n    // Determine number of audio and video tracks we need to send/recv.\n    var offerOptions = arguments[0];\n    if (offerOptions) {\n      // Reject Chrome legacy constraints.\n      if (offerOptions.mandatory || offerOptions.optional) {\n        throw new TypeError(\n            'Legacy mandatory/optional constraints not supported.');\n      }\n      if (offerOptions.offerToReceiveAudio !== undefined) {\n        if (offerOptions.offerToReceiveAudio === true) {\n          numAudioTracks = 1;\n        } else if (offerOptions.offerToReceiveAudio === false) {\n          numAudioTracks = 0;\n        } else {\n          numAudioTracks = offerOptions.offerToReceiveAudio;\n        }\n      }\n      if (offerOptions.offerToReceiveVideo !== undefined) {\n        if (offerOptions.offerToReceiveVideo === true) {\n          numVideoTracks = 1;\n        } else if (offerOptions.offerToReceiveVideo === false) {\n          numVideoTracks = 0;\n        } else {\n          numVideoTracks = offerOptions.offerToReceiveVideo;\n        }\n      }\n    }\n\n    pc.transceivers.forEach(function(transceiver) {\n      if (transceiver.kind === 'audio') {\n        numAudioTracks--;\n        if (numAudioTracks < 0) {\n          transceiver.wantReceive = false;\n        }\n      } else if (transceiver.kind === 'video') {\n        numVideoTracks--;\n        if (numVideoTracks < 0) {\n          transceiver.wantReceive = false;\n        }\n      }\n    });\n\n    // Create M-lines for recvonly streams.\n    while (numAudioTracks > 0 || numVideoTracks > 0) {\n      if (numAudioTracks > 0) {\n        pc._createTransceiver('audio');\n        numAudioTracks--;\n      }\n      if (numVideoTracks > 0) {\n        pc._createTransceiver('video');\n        numVideoTracks--;\n      }\n    }\n\n    var sdp = SDPUtils.writeSessionBoilerplate(pc._sdpSessionId,\n        pc._sdpSessionVersion++);\n    pc.transceivers.forEach(function(transceiver, sdpMLineIndex) {\n      // For each track, create an ice gatherer, ice transport,\n      // dtls transport, potentially rtpsender and rtpreceiver.\n      var track = transceiver.track;\n      var kind = transceiver.kind;\n      var mid = transceiver.mid || SDPUtils.generateIdentifier();\n      transceiver.mid = mid;\n\n      if (!transceiver.iceGatherer) {\n        transceiver.iceGatherer = pc._createIceGatherer(sdpMLineIndex,\n            pc.usingBundle);\n      }\n\n      var localCapabilities = window.RTCRtpSender.getCapabilities(kind);\n      // filter RTX until additional stuff needed for RTX is implemented\n      // in adapter.js\n      if (edgeVersion < 15019) {\n        localCapabilities.codecs = localCapabilities.codecs.filter(\n            function(codec) {\n              return codec.name !== 'rtx';\n            });\n      }\n      localCapabilities.codecs.forEach(function(codec) {\n        // work around https://bugs.chromium.org/p/webrtc/issues/detail?id=6552\n        // by adding level-asymmetry-allowed=1\n        if (codec.name === 'H264' &&\n            codec.parameters['level-asymmetry-allowed'] === undefined) {\n          codec.parameters['level-asymmetry-allowed'] = '1';\n        }\n\n        // for subsequent offers, we might have to re-use the payload\n        // type of the last offer.\n        if (transceiver.remoteCapabilities &&\n            transceiver.remoteCapabilities.codecs) {\n          transceiver.remoteCapabilities.codecs.forEach(function(remoteCodec) {\n            if (codec.name.toLowerCase() === remoteCodec.name.toLowerCase() &&\n                codec.clockRate === remoteCodec.clockRate) {\n              codec.preferredPayloadType = remoteCodec.payloadType;\n            }\n          });\n        }\n      });\n      localCapabilities.headerExtensions.forEach(function(hdrExt) {\n        var remoteExtensions = transceiver.remoteCapabilities &&\n            transceiver.remoteCapabilities.headerExtensions || [];\n        remoteExtensions.forEach(function(rHdrExt) {\n          if (hdrExt.uri === rHdrExt.uri) {\n            hdrExt.id = rHdrExt.id;\n          }\n        });\n      });\n\n      // generate an ssrc now, to be used later in rtpSender.send\n      var sendEncodingParameters = transceiver.sendEncodingParameters || [{\n        ssrc: (2 * sdpMLineIndex + 1) * 1001\n      }];\n      if (track) {\n        // add RTX\n        if (edgeVersion >= 15019 && kind === 'video' &&\n            !sendEncodingParameters[0].rtx) {\n          sendEncodingParameters[0].rtx = {\n            ssrc: sendEncodingParameters[0].ssrc + 1\n          };\n        }\n      }\n\n      if (transceiver.wantReceive) {\n        transceiver.rtpReceiver = new window.RTCRtpReceiver(\n            transceiver.dtlsTransport, kind);\n      }\n\n      transceiver.localCapabilities = localCapabilities;\n      transceiver.sendEncodingParameters = sendEncodingParameters;\n    });\n\n    // always offer BUNDLE and dispose on return if not supported.\n    if (pc._config.bundlePolicy !== 'max-compat') {\n      sdp += 'a=group:BUNDLE ' + pc.transceivers.map(function(t) {\n        return t.mid;\n      }).join(' ') + '\\r\\n';\n    }\n    sdp += 'a=ice-options:trickle\\r\\n';\n\n    pc.transceivers.forEach(function(transceiver, sdpMLineIndex) {\n      sdp += writeMediaSection(transceiver, transceiver.localCapabilities,\n          'offer', transceiver.stream, pc._dtlsRole);\n      sdp += 'a=rtcp-rsize\\r\\n';\n\n      if (transceiver.iceGatherer && pc.iceGatheringState !== 'new' &&\n          (sdpMLineIndex === 0 || !pc.usingBundle)) {\n        transceiver.iceGatherer.getLocalCandidates().forEach(function(cand) {\n          cand.component = 1;\n          sdp += 'a=' + SDPUtils.writeCandidate(cand) + '\\r\\n';\n        });\n\n        if (transceiver.iceGatherer.state === 'completed') {\n          sdp += 'a=end-of-candidates\\r\\n';\n        }\n      }\n    });\n\n    var desc = new window.RTCSessionDescription({\n      type: 'offer',\n      sdp: sdp\n    });\n    return Promise.resolve(desc);\n  };\n\n  RTCPeerConnection.prototype.createAnswer = function() {\n    var pc = this;\n\n    if (pc._isClosed) {\n      return Promise.reject(makeError('InvalidStateError',\n          'Can not call createAnswer after close'));\n    }\n\n    if (!(pc.signalingState === 'have-remote-offer' ||\n        pc.signalingState === 'have-local-pranswer')) {\n      return Promise.reject(makeError('InvalidStateError',\n          'Can not call createAnswer in signalingState ' + pc.signalingState));\n    }\n\n    var sdp = SDPUtils.writeSessionBoilerplate(pc._sdpSessionId,\n        pc._sdpSessionVersion++);\n    if (pc.usingBundle) {\n      sdp += 'a=group:BUNDLE ' + pc.transceivers.map(function(t) {\n        return t.mid;\n      }).join(' ') + '\\r\\n';\n    }\n    sdp += 'a=ice-options:trickle\\r\\n';\n\n    var mediaSectionsInOffer = SDPUtils.getMediaSections(\n        pc._remoteDescription.sdp).length;\n    pc.transceivers.forEach(function(transceiver, sdpMLineIndex) {\n      if (sdpMLineIndex + 1 > mediaSectionsInOffer) {\n        return;\n      }\n      if (transceiver.rejected) {\n        if (transceiver.kind === 'application') {\n          if (transceiver.protocol === 'DTLS/SCTP') { // legacy fmt\n            sdp += 'm=application 0 DTLS/SCTP 5000\\r\\n';\n          } else {\n            sdp += 'm=application 0 ' + transceiver.protocol +\n                ' webrtc-datachannel\\r\\n';\n          }\n        } else if (transceiver.kind === 'audio') {\n          sdp += 'm=audio 0 UDP/TLS/RTP/SAVPF 0\\r\\n' +\n              'a=rtpmap:0 PCMU/8000\\r\\n';\n        } else if (transceiver.kind === 'video') {\n          sdp += 'm=video 0 UDP/TLS/RTP/SAVPF 120\\r\\n' +\n              'a=rtpmap:120 VP8/90000\\r\\n';\n        }\n        sdp += 'c=IN IP4 0.0.0.0\\r\\n' +\n            'a=inactive\\r\\n' +\n            'a=mid:' + transceiver.mid + '\\r\\n';\n        return;\n      }\n\n      // FIXME: look at direction.\n      if (transceiver.stream) {\n        var localTrack;\n        if (transceiver.kind === 'audio') {\n          localTrack = transceiver.stream.getAudioTracks()[0];\n        } else if (transceiver.kind === 'video') {\n          localTrack = transceiver.stream.getVideoTracks()[0];\n        }\n        if (localTrack) {\n          // add RTX\n          if (edgeVersion >= 15019 && transceiver.kind === 'video' &&\n              !transceiver.sendEncodingParameters[0].rtx) {\n            transceiver.sendEncodingParameters[0].rtx = {\n              ssrc: transceiver.sendEncodingParameters[0].ssrc + 1\n            };\n          }\n        }\n      }\n\n      // Calculate intersection of capabilities.\n      var commonCapabilities = getCommonCapabilities(\n          transceiver.localCapabilities,\n          transceiver.remoteCapabilities);\n\n      var hasRtx = commonCapabilities.codecs.filter(function(c) {\n        return c.name.toLowerCase() === 'rtx';\n      }).length;\n      if (!hasRtx && transceiver.sendEncodingParameters[0].rtx) {\n        delete transceiver.sendEncodingParameters[0].rtx;\n      }\n\n      sdp += writeMediaSection(transceiver, commonCapabilities,\n          'answer', transceiver.stream, pc._dtlsRole);\n      if (transceiver.rtcpParameters &&\n          transceiver.rtcpParameters.reducedSize) {\n        sdp += 'a=rtcp-rsize\\r\\n';\n      }\n    });\n\n    var desc = new window.RTCSessionDescription({\n      type: 'answer',\n      sdp: sdp\n    });\n    return Promise.resolve(desc);\n  };\n\n  RTCPeerConnection.prototype.addIceCandidate = function(candidate) {\n    var pc = this;\n    var sections;\n    if (candidate && !(candidate.sdpMLineIndex !== undefined ||\n        candidate.sdpMid)) {\n      return Promise.reject(new TypeError('sdpMLineIndex or sdpMid required'));\n    }\n\n    // TODO: needs to go into ops queue.\n    return new Promise(function(resolve, reject) {\n      if (!pc._remoteDescription) {\n        return reject(makeError('InvalidStateError',\n            'Can not add ICE candidate without a remote description'));\n      } else if (!candidate || candidate.candidate === '') {\n        for (var j = 0; j < pc.transceivers.length; j++) {\n          if (pc.transceivers[j].rejected) {\n            continue;\n          }\n          pc.transceivers[j].iceTransport.addRemoteCandidate({});\n          sections = SDPUtils.getMediaSections(pc._remoteDescription.sdp);\n          sections[j] += 'a=end-of-candidates\\r\\n';\n          pc._remoteDescription.sdp =\n              SDPUtils.getDescription(pc._remoteDescription.sdp) +\n              sections.join('');\n          if (pc.usingBundle) {\n            break;\n          }\n        }\n      } else {\n        var sdpMLineIndex = candidate.sdpMLineIndex;\n        if (candidate.sdpMid) {\n          for (var i = 0; i < pc.transceivers.length; i++) {\n            if (pc.transceivers[i].mid === candidate.sdpMid) {\n              sdpMLineIndex = i;\n              break;\n            }\n          }\n        }\n        var transceiver = pc.transceivers[sdpMLineIndex];\n        if (transceiver) {\n          if (transceiver.rejected) {\n            return resolve();\n          }\n          var cand = Object.keys(candidate.candidate).length > 0 ?\n              SDPUtils.parseCandidate(candidate.candidate) : {};\n          // Ignore Chrome's invalid candidates since Edge does not like them.\n          if (cand.protocol === 'tcp' && (cand.port === 0 || cand.port === 9)) {\n            return resolve();\n          }\n          // Ignore RTCP candidates, we assume RTCP-MUX.\n          if (cand.component && cand.component !== 1) {\n            return resolve();\n          }\n          // when using bundle, avoid adding candidates to the wrong\n          // ice transport. And avoid adding candidates added in the SDP.\n          if (sdpMLineIndex === 0 || (sdpMLineIndex > 0 &&\n              transceiver.iceTransport !== pc.transceivers[0].iceTransport)) {\n            if (!maybeAddCandidate(transceiver.iceTransport, cand)) {\n              return reject(makeError('OperationError',\n                  'Can not add ICE candidate'));\n            }\n          }\n\n          // update the remoteDescription.\n          var candidateString = candidate.candidate.trim();\n          if (candidateString.indexOf('a=') === 0) {\n            candidateString = candidateString.substr(2);\n          }\n          sections = SDPUtils.getMediaSections(pc._remoteDescription.sdp);\n          sections[sdpMLineIndex] += 'a=' +\n              (cand.type ? candidateString : 'end-of-candidates')\n              + '\\r\\n';\n          pc._remoteDescription.sdp =\n              SDPUtils.getDescription(pc._remoteDescription.sdp) +\n              sections.join('');\n        } else {\n          return reject(makeError('OperationError',\n              'Can not add ICE candidate'));\n        }\n      }\n      resolve();\n    });\n  };\n\n  RTCPeerConnection.prototype.getStats = function(selector) {\n    if (selector && selector instanceof window.MediaStreamTrack) {\n      var senderOrReceiver = null;\n      this.transceivers.forEach(function(transceiver) {\n        if (transceiver.rtpSender &&\n            transceiver.rtpSender.track === selector) {\n          senderOrReceiver = transceiver.rtpSender;\n        } else if (transceiver.rtpReceiver &&\n            transceiver.rtpReceiver.track === selector) {\n          senderOrReceiver = transceiver.rtpReceiver;\n        }\n      });\n      if (!senderOrReceiver) {\n        throw makeError('InvalidAccessError', 'Invalid selector.');\n      }\n      return senderOrReceiver.getStats();\n    }\n\n    var promises = [];\n    this.transceivers.forEach(function(transceiver) {\n      ['rtpSender', 'rtpReceiver', 'iceGatherer', 'iceTransport',\n          'dtlsTransport'].forEach(function(method) {\n            if (transceiver[method]) {\n              promises.push(transceiver[method].getStats());\n            }\n          });\n    });\n    return Promise.all(promises).then(function(allStats) {\n      var results = new Map();\n      allStats.forEach(function(stats) {\n        stats.forEach(function(stat) {\n          results.set(stat.id, stat);\n        });\n      });\n      return results;\n    });\n  };\n\n  // fix low-level stat names and return Map instead of object.\n  var ortcObjects = ['RTCRtpSender', 'RTCRtpReceiver', 'RTCIceGatherer',\n    'RTCIceTransport', 'RTCDtlsTransport'];\n  ortcObjects.forEach(function(ortcObjectName) {\n    var obj = window[ortcObjectName];\n    if (obj && obj.prototype && obj.prototype.getStats) {\n      var nativeGetstats = obj.prototype.getStats;\n      obj.prototype.getStats = function() {\n        return nativeGetstats.apply(this)\n        .then(function(nativeStats) {\n          var mapStats = new Map();\n          Object.keys(nativeStats).forEach(function(id) {\n            nativeStats[id].type = fixStatsType(nativeStats[id]);\n            mapStats.set(id, nativeStats[id]);\n          });\n          return mapStats;\n        });\n      };\n    }\n  });\n\n  // legacy callback shims. Should be moved to adapter.js some days.\n  var methods = ['createOffer', 'createAnswer'];\n  methods.forEach(function(method) {\n    var nativeMethod = RTCPeerConnection.prototype[method];\n    RTCPeerConnection.prototype[method] = function() {\n      var args = arguments;\n      if (typeof args[0] === 'function' ||\n          typeof args[1] === 'function') { // legacy\n        return nativeMethod.apply(this, [arguments[2]])\n        .then(function(description) {\n          if (typeof args[0] === 'function') {\n            args[0].apply(null, [description]);\n          }\n        }, function(error) {\n          if (typeof args[1] === 'function') {\n            args[1].apply(null, [error]);\n          }\n        });\n      }\n      return nativeMethod.apply(this, arguments);\n    };\n  });\n\n  methods = ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate'];\n  methods.forEach(function(method) {\n    var nativeMethod = RTCPeerConnection.prototype[method];\n    RTCPeerConnection.prototype[method] = function() {\n      var args = arguments;\n      if (typeof args[1] === 'function' ||\n          typeof args[2] === 'function') { // legacy\n        return nativeMethod.apply(this, arguments)\n        .then(function() {\n          if (typeof args[1] === 'function') {\n            args[1].apply(null);\n          }\n        }, function(error) {\n          if (typeof args[2] === 'function') {\n            args[2].apply(null, [error]);\n          }\n        });\n      }\n      return nativeMethod.apply(this, arguments);\n    };\n  });\n\n  // getStats is special. It doesn't have a spec legacy method yet we support\n  // getStats(something, cb) without error callbacks.\n  ['getStats'].forEach(function(method) {\n    var nativeMethod = RTCPeerConnection.prototype[method];\n    RTCPeerConnection.prototype[method] = function() {\n      var args = arguments;\n      if (typeof args[1] === 'function') {\n        return nativeMethod.apply(this, arguments)\n        .then(function() {\n          if (typeof args[1] === 'function') {\n            args[1].apply(null);\n          }\n        });\n      }\n      return nativeMethod.apply(this, arguments);\n    };\n  });\n\n  return RTCPeerConnection;\n};\n","import mod from \"-!../node_modules/vue-style-loader/index.js!../node_modules/css-loader/dist/cjs.js!../node_modules/vue-loader/lib/loaders/stylePostLoader.js!../node_modules/vue-loader/lib/index.js??vue-loader-options!./Scanner.vue?vue&type=style&index=0&id=4ebacf15&scoped=true&lang=css&\"; export default mod; export * from \"-!../node_modules/vue-style-loader/index.js!../node_modules/css-loader/dist/cjs.js!../node_modules/vue-loader/lib/loaders/stylePostLoader.js!../node_modules/vue-loader/lib/index.js??vue-loader-options!./Scanner.vue?vue&type=style&index=0&id=4ebacf15&scoped=true&lang=css&\"","exports = module.exports = require(\"../node_modules/css-loader/dist/runtime/api.js\")(false);\n// Module\nexports.push([module.id, \"\\n.viewport[data-v-4ebacf15] {\\n  position: relative;\\n}\\n.viewport canvas[data-v-4ebacf15],\\n.viewport video[data-v-4ebacf15] {\\n  position: absolute;\\n  left: 0;\\n  top: 0;\\n}\\n\", \"\"]);\n\n","\"use strict\";\n\n/*\n  MIT License http://www.opensource.org/licenses/mit-license.php\n  Author Tobias Koppers @sokra\n*/\n// css base code, injected by the css-loader\nmodule.exports = function (useSourceMap) {\n  var list = []; // return the list of modules as css string\n\n  list.toString = function toString() {\n    return this.map(function (item) {\n      var content = cssWithMappingToString(item, useSourceMap);\n\n      if (item[2]) {\n        return '@media ' + item[2] + '{' + content + '}';\n      } else {\n        return content;\n      }\n    }).join('');\n  }; // import a list of modules into the list\n\n\n  list.i = function (modules, mediaQuery) {\n    if (typeof modules === 'string') {\n      modules = [[null, modules, '']];\n    }\n\n    var alreadyImportedModules = {};\n\n    for (var i = 0; i < this.length; i++) {\n      var id = this[i][0];\n\n      if (id != null) {\n        alreadyImportedModules[id] = true;\n      }\n    }\n\n    for (i = 0; i < modules.length; i++) {\n      var item = modules[i]; // skip already imported module\n      // this implementation is not 100% perfect for weird media query combinations\n      // when a module is imported multiple times with different media queries.\n      // I hope this will never occur (Hey this way we have smaller bundles)\n\n      if (item[0] == null || !alreadyImportedModules[item[0]]) {\n        if (mediaQuery && !item[2]) {\n          item[2] = mediaQuery;\n        } else if (mediaQuery) {\n          item[2] = '(' + item[2] + ') and (' + mediaQuery + ')';\n        }\n\n        list.push(item);\n      }\n    }\n  };\n\n  return list;\n};\n\nfunction cssWithMappingToString(item, useSourceMap) {\n  var content = item[1] || '';\n  var cssMapping = item[3];\n\n  if (!cssMapping) {\n    return content;\n  }\n\n  if (useSourceMap && typeof btoa === 'function') {\n    var sourceMapping = toComment(cssMapping);\n    var sourceURLs = cssMapping.sources.map(function (source) {\n      return '/*# sourceURL=' + cssMapping.sourceRoot + source + ' */';\n    });\n    return [content].concat(sourceURLs).concat([sourceMapping]).join('\\n');\n  }\n\n  return [content].join('\\n');\n} // Adapted from convert-source-map (MIT)\n\n\nfunction toComment(sourceMap) {\n  // eslint-disable-next-line no-undef\n  var base64 = btoa(unescape(encodeURIComponent(JSON.stringify(sourceMap))));\n  var data = 'sourceMappingURL=data:application/json;charset=utf-8;base64,' + base64;\n  return '/*# ' + data + ' */';\n}","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n /* eslint-env node */\n'use strict';\n\nlet logDisabled_ = true;\nlet deprecationWarnings_ = true;\n\n/**\n * Extract browser version out of the provided user agent string.\n *\n * @param {!string} uastring userAgent string.\n * @param {!string} expr Regular expression used as match criteria.\n * @param {!number} pos position in the version string to be returned.\n * @return {!number} browser version.\n */\nexport function extractVersion(uastring, expr, pos) {\n  const match = uastring.match(expr);\n  return match && match.length >= pos && parseInt(match[pos], 10);\n}\n\n// Wraps the peerconnection event eventNameToWrap in a function\n// which returns the modified event object (or false to prevent\n// the event).\nexport function wrapPeerConnectionEvent(window, eventNameToWrap, wrapper) {\n  if (!window.RTCPeerConnection) {\n    return;\n  }\n  const proto = window.RTCPeerConnection.prototype;\n  const nativeAddEventListener = proto.addEventListener;\n  proto.addEventListener = function(nativeEventName, cb) {\n    if (nativeEventName !== eventNameToWrap) {\n      return nativeAddEventListener.apply(this, arguments);\n    }\n    const wrappedCallback = (e) => {\n      const modifiedEvent = wrapper(e);\n      if (modifiedEvent) {\n        cb(modifiedEvent);\n      }\n    };\n    this._eventMap = this._eventMap || {};\n    this._eventMap[cb] = wrappedCallback;\n    return nativeAddEventListener.apply(this, [nativeEventName,\n      wrappedCallback]);\n  };\n\n  const nativeRemoveEventListener = proto.removeEventListener;\n  proto.removeEventListener = function(nativeEventName, cb) {\n    if (nativeEventName !== eventNameToWrap || !this._eventMap\n        || !this._eventMap[cb]) {\n      return nativeRemoveEventListener.apply(this, arguments);\n    }\n    const unwrappedCb = this._eventMap[cb];\n    delete this._eventMap[cb];\n    return nativeRemoveEventListener.apply(this, [nativeEventName,\n      unwrappedCb]);\n  };\n\n  Object.defineProperty(proto, 'on' + eventNameToWrap, {\n    get() {\n      return this['_on' + eventNameToWrap];\n    },\n    set(cb) {\n      if (this['_on' + eventNameToWrap]) {\n        this.removeEventListener(eventNameToWrap,\n            this['_on' + eventNameToWrap]);\n        delete this['_on' + eventNameToWrap];\n      }\n      if (cb) {\n        this.addEventListener(eventNameToWrap,\n            this['_on' + eventNameToWrap] = cb);\n      }\n    },\n    enumerable: true,\n    configurable: true\n  });\n}\n\nexport function disableLog(bool) {\n  if (typeof bool !== 'boolean') {\n    return new Error('Argument type: ' + typeof bool +\n        '. Please use a boolean.');\n  }\n  logDisabled_ = bool;\n  return (bool) ? 'adapter.js logging disabled' :\n      'adapter.js logging enabled';\n}\n\n/**\n * Disable or enable deprecation warnings\n * @param {!boolean} bool set to true to disable warnings.\n */\nexport function disableWarnings(bool) {\n  if (typeof bool !== 'boolean') {\n    return new Error('Argument type: ' + typeof bool +\n        '. Please use a boolean.');\n  }\n  deprecationWarnings_ = !bool;\n  return 'adapter.js deprecation warnings ' + (bool ? 'disabled' : 'enabled');\n}\n\nexport function log() {\n  if (typeof window === 'object') {\n    if (logDisabled_) {\n      return;\n    }\n    if (typeof console !== 'undefined' && typeof console.log === 'function') {\n      console.log.apply(console, arguments);\n    }\n  }\n}\n\n/**\n * Shows a deprecation warning suggesting the modern and spec-compatible API.\n */\nexport function deprecated(oldMethod, newMethod) {\n  if (!deprecationWarnings_) {\n    return;\n  }\n  console.warn(oldMethod + ' is deprecated, please use ' + newMethod +\n      ' instead.');\n}\n\n/**\n * Browser detector.\n *\n * @return {object} result containing browser and version\n *     properties.\n */\nexport function detectBrowser(window) {\n  const {navigator} = window;\n\n  // Returned result object.\n  const result = {browser: null, version: null};\n\n  // Fail early if it's not a browser\n  if (typeof window === 'undefined' || !window.navigator) {\n    result.browser = 'Not a browser.';\n    return result;\n  }\n\n  if (navigator.mozGetUserMedia) { // Firefox.\n    result.browser = 'firefox';\n    result.version = extractVersion(navigator.userAgent,\n        /Firefox\\/(\\d+)\\./, 1);\n  } else if (navigator.webkitGetUserMedia) {\n    // Chrome, Chromium, Webview, Opera.\n    // Version matches Chrome/WebRTC version.\n    result.browser = 'chrome';\n    result.version = extractVersion(navigator.userAgent,\n        /Chrom(e|ium)\\/(\\d+)\\./, 2);\n  } else if (navigator.mediaDevices &&\n      navigator.userAgent.match(/Edge\\/(\\d+).(\\d+)$/)) { // Edge.\n    result.browser = 'edge';\n    result.version = extractVersion(navigator.userAgent,\n        /Edge\\/(\\d+).(\\d+)$/, 2);\n  } else if (window.RTCPeerConnection &&\n      navigator.userAgent.match(/AppleWebKit\\/(\\d+)\\./)) { // Safari.\n    result.browser = 'safari';\n    result.version = extractVersion(navigator.userAgent,\n        /AppleWebKit\\/(\\d+)\\./, 1);\n  } else { // Default fallthrough: not supported.\n    result.browser = 'Not a supported browser.';\n    return result;\n  }\n\n  return result;\n}\n\n/**\n * Remove all empty objects and undefined values\n * from a nested object -- an enhanced and vanilla version\n * of Lodash's `compact`.\n */\nexport function compactObject(data) {\n  if (typeof data !== 'object') {\n    return data;\n  }\n\n  return Object.keys(data).reduce(function(accumulator, key) {\n    const isObject = typeof data[key] === 'object';\n    const value = isObject ? compactObject(data[key]) : data[key];\n    const isEmptyObject = isObject && !Object.keys(value).length;\n    if (value === undefined || isEmptyObject) {\n      return accumulator;\n    }\n\n    return Object.assign(accumulator, {[key]: value});\n  }, {});\n}\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\nimport * as utils from '../utils.js';\nconst logging = utils.log;\n\nexport function shimGetUserMedia(window) {\n  const navigator = window && window.navigator;\n\n  if (!navigator.mediaDevices) {\n    return;\n  }\n\n  const browserDetails = utils.detectBrowser(window);\n\n  const constraintsToChrome_ = function(c) {\n    if (typeof c !== 'object' || c.mandatory || c.optional) {\n      return c;\n    }\n    const cc = {};\n    Object.keys(c).forEach(key => {\n      if (key === 'require' || key === 'advanced' || key === 'mediaSource') {\n        return;\n      }\n      const r = (typeof c[key] === 'object') ? c[key] : {ideal: c[key]};\n      if (r.exact !== undefined && typeof r.exact === 'number') {\n        r.min = r.max = r.exact;\n      }\n      const oldname_ = function(prefix, name) {\n        if (prefix) {\n          return prefix + name.charAt(0).toUpperCase() + name.slice(1);\n        }\n        return (name === 'deviceId') ? 'sourceId' : name;\n      };\n      if (r.ideal !== undefined) {\n        cc.optional = cc.optional || [];\n        let oc = {};\n        if (typeof r.ideal === 'number') {\n          oc[oldname_('min', key)] = r.ideal;\n          cc.optional.push(oc);\n          oc = {};\n          oc[oldname_('max', key)] = r.ideal;\n          cc.optional.push(oc);\n        } else {\n          oc[oldname_('', key)] = r.ideal;\n          cc.optional.push(oc);\n        }\n      }\n      if (r.exact !== undefined && typeof r.exact !== 'number') {\n        cc.mandatory = cc.mandatory || {};\n        cc.mandatory[oldname_('', key)] = r.exact;\n      } else {\n        ['min', 'max'].forEach(mix => {\n          if (r[mix] !== undefined) {\n            cc.mandatory = cc.mandatory || {};\n            cc.mandatory[oldname_(mix, key)] = r[mix];\n          }\n        });\n      }\n    });\n    if (c.advanced) {\n      cc.optional = (cc.optional || []).concat(c.advanced);\n    }\n    return cc;\n  };\n\n  const shimConstraints_ = function(constraints, func) {\n    if (browserDetails.version >= 61) {\n      return func(constraints);\n    }\n    constraints = JSON.parse(JSON.stringify(constraints));\n    if (constraints && typeof constraints.audio === 'object') {\n      const remap = function(obj, a, b) {\n        if (a in obj && !(b in obj)) {\n          obj[b] = obj[a];\n          delete obj[a];\n        }\n      };\n      constraints = JSON.parse(JSON.stringify(constraints));\n      remap(constraints.audio, 'autoGainControl', 'googAutoGainControl');\n      remap(constraints.audio, 'noiseSuppression', 'googNoiseSuppression');\n      constraints.audio = constraintsToChrome_(constraints.audio);\n    }\n    if (constraints && typeof constraints.video === 'object') {\n      // Shim facingMode for mobile & surface pro.\n      let face = constraints.video.facingMode;\n      face = face && ((typeof face === 'object') ? face : {ideal: face});\n      const getSupportedFacingModeLies = browserDetails.version < 66;\n\n      if ((face && (face.exact === 'user' || face.exact === 'environment' ||\n                    face.ideal === 'user' || face.ideal === 'environment')) &&\n          !(navigator.mediaDevices.getSupportedConstraints &&\n            navigator.mediaDevices.getSupportedConstraints().facingMode &&\n            !getSupportedFacingModeLies)) {\n        delete constraints.video.facingMode;\n        let matches;\n        if (face.exact === 'environment' || face.ideal === 'environment') {\n          matches = ['back', 'rear'];\n        } else if (face.exact === 'user' || face.ideal === 'user') {\n          matches = ['front'];\n        }\n        if (matches) {\n          // Look for matches in label, or use last cam for back (typical).\n          return navigator.mediaDevices.enumerateDevices()\n          .then(devices => {\n            devices = devices.filter(d => d.kind === 'videoinput');\n            let dev = devices.find(d => matches.some(match =>\n              d.label.toLowerCase().includes(match)));\n            if (!dev && devices.length && matches.includes('back')) {\n              dev = devices[devices.length - 1]; // more likely the back cam\n            }\n            if (dev) {\n              constraints.video.deviceId = face.exact ? {exact: dev.deviceId} :\n                                                        {ideal: dev.deviceId};\n            }\n            constraints.video = constraintsToChrome_(constraints.video);\n            logging('chrome: ' + JSON.stringify(constraints));\n            return func(constraints);\n          });\n        }\n      }\n      constraints.video = constraintsToChrome_(constraints.video);\n    }\n    logging('chrome: ' + JSON.stringify(constraints));\n    return func(constraints);\n  };\n\n  const shimError_ = function(e) {\n    if (browserDetails.version >= 64) {\n      return e;\n    }\n    return {\n      name: {\n        PermissionDeniedError: 'NotAllowedError',\n        PermissionDismissedError: 'NotAllowedError',\n        InvalidStateError: 'NotAllowedError',\n        DevicesNotFoundError: 'NotFoundError',\n        ConstraintNotSatisfiedError: 'OverconstrainedError',\n        TrackStartError: 'NotReadableError',\n        MediaDeviceFailedDueToShutdown: 'NotAllowedError',\n        MediaDeviceKillSwitchOn: 'NotAllowedError',\n        TabCaptureError: 'AbortError',\n        ScreenCaptureError: 'AbortError',\n        DeviceCaptureError: 'AbortError'\n      }[e.name] || e.name,\n      message: e.message,\n      constraint: e.constraint || e.constraintName,\n      toString() {\n        return this.name + (this.message && ': ') + this.message;\n      }\n    };\n  };\n\n  const getUserMedia_ = function(constraints, onSuccess, onError) {\n    shimConstraints_(constraints, c => {\n      navigator.webkitGetUserMedia(c, onSuccess, e => {\n        if (onError) {\n          onError(shimError_(e));\n        }\n      });\n    });\n  };\n  navigator.getUserMedia = getUserMedia_.bind(navigator);\n\n  // Even though Chrome 45 has navigator.mediaDevices and a getUserMedia\n  // function which returns a Promise, it does not accept spec-style\n  // constraints.\n  const origGetUserMedia = navigator.mediaDevices.getUserMedia.\n      bind(navigator.mediaDevices);\n  navigator.mediaDevices.getUserMedia = function(cs) {\n    return shimConstraints_(cs, c => origGetUserMedia(c).then(stream => {\n      if (c.audio && !stream.getAudioTracks().length ||\n          c.video && !stream.getVideoTracks().length) {\n        stream.getTracks().forEach(track => {\n          track.stop();\n        });\n        throw new DOMException('', 'NotFoundError');\n      }\n      return stream;\n    }, e => Promise.reject(shimError_(e))));\n  };\n}\n","/*\n *  Copyright (c) 2018 The adapter.js project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\nexport function shimGetDisplayMedia(window, getSourceId) {\n  if (window.navigator.mediaDevices &&\n    'getDisplayMedia' in window.navigator.mediaDevices) {\n    return;\n  }\n  if (!(window.navigator.mediaDevices)) {\n    return;\n  }\n  // getSourceId is a function that returns a promise resolving with\n  // the sourceId of the screen/window/tab to be shared.\n  if (typeof getSourceId !== 'function') {\n    console.error('shimGetDisplayMedia: getSourceId argument is not ' +\n        'a function');\n    return;\n  }\n  window.navigator.mediaDevices.getDisplayMedia = function(constraints) {\n    return getSourceId(constraints)\n      .then(sourceId => {\n        const widthSpecified = constraints.video && constraints.video.width;\n        const heightSpecified = constraints.video && constraints.video.height;\n        const frameRateSpecified = constraints.video &&\n          constraints.video.frameRate;\n        constraints.video = {\n          mandatory: {\n            chromeMediaSource: 'desktop',\n            chromeMediaSourceId: sourceId,\n            maxFrameRate: frameRateSpecified || 3\n          }\n        };\n        if (widthSpecified) {\n          constraints.video.mandatory.maxWidth = widthSpecified;\n        }\n        if (heightSpecified) {\n          constraints.video.mandatory.maxHeight = heightSpecified;\n        }\n        return window.navigator.mediaDevices.getUserMedia(constraints);\n      });\n  };\n}\n","\n/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n /* eslint-env node */\n'use strict';\nimport * as utils from '../utils.js';\n\n/* iterates the stats graph recursively. */\nfunction walkStats(stats, base, resultSet) {\n  if (!base || resultSet.has(base.id)) {\n    return;\n  }\n  resultSet.set(base.id, base);\n  Object.keys(base).forEach(name => {\n    if (name.endsWith('Id')) {\n      walkStats(stats, stats.get(base[name]), resultSet);\n    } else if (name.endsWith('Ids')) {\n      base[name].forEach(id => {\n        walkStats(stats, stats.get(id), resultSet);\n      });\n    }\n  });\n}\n\n/* filter getStats for a sender/receiver track. */\nfunction filterStats(result, track, outbound) {\n  const streamStatsType = outbound ? 'outbound-rtp' : 'inbound-rtp';\n  const filteredResult = new Map();\n  if (track === null) {\n    return filteredResult;\n  }\n  const trackStats = [];\n  result.forEach(value => {\n    if (value.type === 'track' &&\n        value.trackIdentifier === track.id) {\n      trackStats.push(value);\n    }\n  });\n  trackStats.forEach(trackStat => {\n    result.forEach(stats => {\n      if (stats.type === streamStatsType && stats.trackId === trackStat.id) {\n        walkStats(result, stats, filteredResult);\n      }\n    });\n  });\n  return filteredResult;\n}\n\nexport {shimGetUserMedia} from './getusermedia';\nexport {shimGetDisplayMedia} from './getdisplaymedia';\n\nexport function shimMediaStream(window) {\n  window.MediaStream = window.MediaStream || window.webkitMediaStream;\n}\n\nexport function shimOnTrack(window) {\n  if (typeof window === 'object' && window.RTCPeerConnection && !('ontrack' in\n      window.RTCPeerConnection.prototype)) {\n    Object.defineProperty(window.RTCPeerConnection.prototype, 'ontrack', {\n      get() {\n        return this._ontrack;\n      },\n      set(f) {\n        if (this._ontrack) {\n          this.removeEventListener('track', this._ontrack);\n        }\n        this.addEventListener('track', this._ontrack = f);\n      },\n      enumerable: true,\n      configurable: true\n    });\n    const origSetRemoteDescription =\n        window.RTCPeerConnection.prototype.setRemoteDescription;\n    window.RTCPeerConnection.prototype.setRemoteDescription = function() {\n      if (!this._ontrackpoly) {\n        this._ontrackpoly = (e) => {\n          // onaddstream does not fire when a track is added to an existing\n          // stream. But stream.onaddtrack is implemented so we use that.\n          e.stream.addEventListener('addtrack', te => {\n            let receiver;\n            if (window.RTCPeerConnection.prototype.getReceivers) {\n              receiver = this.getReceivers()\n                .find(r => r.track && r.track.id === te.track.id);\n            } else {\n              receiver = {track: te.track};\n            }\n\n            const event = new Event('track');\n            event.track = te.track;\n            event.receiver = receiver;\n            event.transceiver = {receiver};\n            event.streams = [e.stream];\n            this.dispatchEvent(event);\n          });\n          e.stream.getTracks().forEach(track => {\n            let receiver;\n            if (window.RTCPeerConnection.prototype.getReceivers) {\n              receiver = this.getReceivers()\n                .find(r => r.track && r.track.id === track.id);\n            } else {\n              receiver = {track};\n            }\n            const event = new Event('track');\n            event.track = track;\n            event.receiver = receiver;\n            event.transceiver = {receiver};\n            event.streams = [e.stream];\n            this.dispatchEvent(event);\n          });\n        };\n        this.addEventListener('addstream', this._ontrackpoly);\n      }\n      return origSetRemoteDescription.apply(this, arguments);\n    };\n  } else {\n    // even if RTCRtpTransceiver is in window, it is only used and\n    // emitted in unified-plan. Unfortunately this means we need\n    // to unconditionally wrap the event.\n    utils.wrapPeerConnectionEvent(window, 'track', e => {\n      if (!e.transceiver) {\n        Object.defineProperty(e, 'transceiver',\n          {value: {receiver: e.receiver}});\n      }\n      return e;\n    });\n  }\n}\n\nexport function shimGetSendersWithDtmf(window) {\n  // Overrides addTrack/removeTrack, depends on shimAddTrackRemoveTrack.\n  if (typeof window === 'object' && window.RTCPeerConnection &&\n      !('getSenders' in window.RTCPeerConnection.prototype) &&\n      'createDTMFSender' in window.RTCPeerConnection.prototype) {\n    const shimSenderWithDtmf = function(pc, track) {\n      return {\n        track,\n        get dtmf() {\n          if (this._dtmf === undefined) {\n            if (track.kind === 'audio') {\n              this._dtmf = pc.createDTMFSender(track);\n            } else {\n              this._dtmf = null;\n            }\n          }\n          return this._dtmf;\n        },\n        _pc: pc\n      };\n    };\n\n    // augment addTrack when getSenders is not available.\n    if (!window.RTCPeerConnection.prototype.getSenders) {\n      window.RTCPeerConnection.prototype.getSenders = function() {\n        this._senders = this._senders || [];\n        return this._senders.slice(); // return a copy of the internal state.\n      };\n      const origAddTrack = window.RTCPeerConnection.prototype.addTrack;\n      window.RTCPeerConnection.prototype.addTrack = function(track, stream) {\n        let sender = origAddTrack.apply(this, arguments);\n        if (!sender) {\n          sender = shimSenderWithDtmf(this, track);\n          this._senders.push(sender);\n        }\n        return sender;\n      };\n\n      const origRemoveTrack = window.RTCPeerConnection.prototype.removeTrack;\n      window.RTCPeerConnection.prototype.removeTrack = function(sender) {\n        origRemoveTrack.apply(this, arguments);\n        const idx = this._senders.indexOf(sender);\n        if (idx !== -1) {\n          this._senders.splice(idx, 1);\n        }\n      };\n    }\n    const origAddStream = window.RTCPeerConnection.prototype.addStream;\n    window.RTCPeerConnection.prototype.addStream = function(stream) {\n      this._senders = this._senders || [];\n      origAddStream.apply(this, [stream]);\n      stream.getTracks().forEach(track => {\n        this._senders.push(shimSenderWithDtmf(this, track));\n      });\n    };\n\n    const origRemoveStream = window.RTCPeerConnection.prototype.removeStream;\n    window.RTCPeerConnection.prototype.removeStream = function(stream) {\n      this._senders = this._senders || [];\n      origRemoveStream.apply(this, [stream]);\n\n      stream.getTracks().forEach(track => {\n        const sender = this._senders.find(s => s.track === track);\n        if (sender) { // remove sender\n          this._senders.splice(this._senders.indexOf(sender), 1);\n        }\n      });\n    };\n  } else if (typeof window === 'object' && window.RTCPeerConnection &&\n             'getSenders' in window.RTCPeerConnection.prototype &&\n             'createDTMFSender' in window.RTCPeerConnection.prototype &&\n             window.RTCRtpSender &&\n             !('dtmf' in window.RTCRtpSender.prototype)) {\n    const origGetSenders = window.RTCPeerConnection.prototype.getSenders;\n    window.RTCPeerConnection.prototype.getSenders = function() {\n      const senders = origGetSenders.apply(this, []);\n      senders.forEach(sender => sender._pc = this);\n      return senders;\n    };\n\n    Object.defineProperty(window.RTCRtpSender.prototype, 'dtmf', {\n      get() {\n        if (this._dtmf === undefined) {\n          if (this.track.kind === 'audio') {\n            this._dtmf = this._pc.createDTMFSender(this.track);\n          } else {\n            this._dtmf = null;\n          }\n        }\n        return this._dtmf;\n      }\n    });\n  }\n}\n\nexport function shimSenderReceiverGetStats(window) {\n  if (!(typeof window === 'object' && window.RTCPeerConnection &&\n      window.RTCRtpSender && window.RTCRtpReceiver)) {\n    return;\n  }\n\n  // shim sender stats.\n  if (!('getStats' in window.RTCRtpSender.prototype)) {\n    const origGetSenders = window.RTCPeerConnection.prototype.getSenders;\n    if (origGetSenders) {\n      window.RTCPeerConnection.prototype.getSenders = function() {\n        const senders = origGetSenders.apply(this, []);\n        senders.forEach(sender => sender._pc = this);\n        return senders;\n      };\n    }\n\n    const origAddTrack = window.RTCPeerConnection.prototype.addTrack;\n    if (origAddTrack) {\n      window.RTCPeerConnection.prototype.addTrack = function() {\n        const sender = origAddTrack.apply(this, arguments);\n        sender._pc = this;\n        return sender;\n      };\n    }\n    window.RTCRtpSender.prototype.getStats = function() {\n      const sender = this;\n      return this._pc.getStats().then(result =>\n        /* Note: this will include stats of all senders that\n         *   send a track with the same id as sender.track as\n         *   it is not possible to identify the RTCRtpSender.\n         */\n        filterStats(result, sender.track, true));\n    };\n  }\n\n  // shim receiver stats.\n  if (!('getStats' in window.RTCRtpReceiver.prototype)) {\n    const origGetReceivers = window.RTCPeerConnection.prototype.getReceivers;\n    if (origGetReceivers) {\n      window.RTCPeerConnection.prototype.getReceivers = function() {\n        const receivers = origGetReceivers.apply(this, []);\n        receivers.forEach(receiver => receiver._pc = this);\n        return receivers;\n      };\n    }\n    utils.wrapPeerConnectionEvent(window, 'track', e => {\n      e.receiver._pc = e.srcElement;\n      return e;\n    });\n    window.RTCRtpReceiver.prototype.getStats = function() {\n      const receiver = this;\n      return this._pc.getStats().then(result =>\n        filterStats(result, receiver.track, false));\n    };\n  }\n\n  if (!('getStats' in window.RTCRtpSender.prototype &&\n      'getStats' in window.RTCRtpReceiver.prototype)) {\n    return;\n  }\n\n  // shim RTCPeerConnection.getStats(track).\n  const origGetStats = window.RTCPeerConnection.prototype.getStats;\n  window.RTCPeerConnection.prototype.getStats = function() {\n    if (arguments.length > 0 &&\n        arguments[0] instanceof window.MediaStreamTrack) {\n      const track = arguments[0];\n      let sender;\n      let receiver;\n      let err;\n      this.getSenders().forEach(s => {\n        if (s.track === track) {\n          if (sender) {\n            err = true;\n          } else {\n            sender = s;\n          }\n        }\n      });\n      this.getReceivers().forEach(r => {\n        if (r.track === track) {\n          if (receiver) {\n            err = true;\n          } else {\n            receiver = r;\n          }\n        }\n        return r.track === track;\n      });\n      if (err || (sender && receiver)) {\n        return Promise.reject(new DOMException(\n          'There are more than one sender or receiver for the track.',\n          'InvalidAccessError'));\n      } else if (sender) {\n        return sender.getStats();\n      } else if (receiver) {\n        return receiver.getStats();\n      }\n      return Promise.reject(new DOMException(\n        'There is no sender or receiver for the track.',\n        'InvalidAccessError'));\n    }\n    return origGetStats.apply(this, arguments);\n  };\n}\n\nexport function shimAddTrackRemoveTrackWithNative(window) {\n  // shim addTrack/removeTrack with native variants in order to make\n  // the interactions with legacy getLocalStreams behave as in other browsers.\n  // Keeps a mapping stream.id => [stream, rtpsenders...]\n  window.RTCPeerConnection.prototype.getLocalStreams = function() {\n    this._shimmedLocalStreams = this._shimmedLocalStreams || {};\n    return Object.keys(this._shimmedLocalStreams)\n      .map(streamId => this._shimmedLocalStreams[streamId][0]);\n  };\n\n  const origAddTrack = window.RTCPeerConnection.prototype.addTrack;\n  window.RTCPeerConnection.prototype.addTrack = function(track, stream) {\n    if (!stream) {\n      return origAddTrack.apply(this, arguments);\n    }\n    this._shimmedLocalStreams = this._shimmedLocalStreams || {};\n\n    const sender = origAddTrack.apply(this, arguments);\n    if (!this._shimmedLocalStreams[stream.id]) {\n      this._shimmedLocalStreams[stream.id] = [stream, sender];\n    } else if (this._shimmedLocalStreams[stream.id].indexOf(sender) === -1) {\n      this._shimmedLocalStreams[stream.id].push(sender);\n    }\n    return sender;\n  };\n\n  const origAddStream = window.RTCPeerConnection.prototype.addStream;\n  window.RTCPeerConnection.prototype.addStream = function(stream) {\n    this._shimmedLocalStreams = this._shimmedLocalStreams || {};\n\n    stream.getTracks().forEach(track => {\n      const alreadyExists = this.getSenders().find(s => s.track === track);\n      if (alreadyExists) {\n        throw new DOMException('Track already exists.',\n            'InvalidAccessError');\n      }\n    });\n    const existingSenders = this.getSenders();\n    origAddStream.apply(this, arguments);\n    const newSenders = this.getSenders()\n      .filter(newSender => existingSenders.indexOf(newSender) === -1);\n    this._shimmedLocalStreams[stream.id] = [stream].concat(newSenders);\n  };\n\n  const origRemoveStream = window.RTCPeerConnection.prototype.removeStream;\n  window.RTCPeerConnection.prototype.removeStream = function(stream) {\n    this._shimmedLocalStreams = this._shimmedLocalStreams || {};\n    delete this._shimmedLocalStreams[stream.id];\n    return origRemoveStream.apply(this, arguments);\n  };\n\n  const origRemoveTrack = window.RTCPeerConnection.prototype.removeTrack;\n  window.RTCPeerConnection.prototype.removeTrack = function(sender) {\n    this._shimmedLocalStreams = this._shimmedLocalStreams || {};\n    if (sender) {\n      Object.keys(this._shimmedLocalStreams).forEach(streamId => {\n        const idx = this._shimmedLocalStreams[streamId].indexOf(sender);\n        if (idx !== -1) {\n          this._shimmedLocalStreams[streamId].splice(idx, 1);\n        }\n        if (this._shimmedLocalStreams[streamId].length === 1) {\n          delete this._shimmedLocalStreams[streamId];\n        }\n      });\n    }\n    return origRemoveTrack.apply(this, arguments);\n  };\n}\n\nexport function shimAddTrackRemoveTrack(window) {\n  if (!window.RTCPeerConnection) {\n    return;\n  }\n  const browserDetails = utils.detectBrowser(window);\n  // shim addTrack and removeTrack.\n  if (window.RTCPeerConnection.prototype.addTrack &&\n      browserDetails.version >= 65) {\n    return shimAddTrackRemoveTrackWithNative(window);\n  }\n\n  // also shim pc.getLocalStreams when addTrack is shimmed\n  // to return the original streams.\n  const origGetLocalStreams = window.RTCPeerConnection.prototype\n      .getLocalStreams;\n  window.RTCPeerConnection.prototype.getLocalStreams = function() {\n    const nativeStreams = origGetLocalStreams.apply(this);\n    this._reverseStreams = this._reverseStreams || {};\n    return nativeStreams.map(stream => this._reverseStreams[stream.id]);\n  };\n\n  const origAddStream = window.RTCPeerConnection.prototype.addStream;\n  window.RTCPeerConnection.prototype.addStream = function(stream) {\n    this._streams = this._streams || {};\n    this._reverseStreams = this._reverseStreams || {};\n\n    stream.getTracks().forEach(track => {\n      const alreadyExists = this.getSenders().find(s => s.track === track);\n      if (alreadyExists) {\n        throw new DOMException('Track already exists.',\n            'InvalidAccessError');\n      }\n    });\n    // Add identity mapping for consistency with addTrack.\n    // Unless this is being used with a stream from addTrack.\n    if (!this._reverseStreams[stream.id]) {\n      const newStream = new window.MediaStream(stream.getTracks());\n      this._streams[stream.id] = newStream;\n      this._reverseStreams[newStream.id] = stream;\n      stream = newStream;\n    }\n    origAddStream.apply(this, [stream]);\n  };\n\n  const origRemoveStream = window.RTCPeerConnection.prototype.removeStream;\n  window.RTCPeerConnection.prototype.removeStream = function(stream) {\n    this._streams = this._streams || {};\n    this._reverseStreams = this._reverseStreams || {};\n\n    origRemoveStream.apply(this, [(this._streams[stream.id] || stream)]);\n    delete this._reverseStreams[(this._streams[stream.id] ?\n        this._streams[stream.id].id : stream.id)];\n    delete this._streams[stream.id];\n  };\n\n  window.RTCPeerConnection.prototype.addTrack = function(track, stream) {\n    if (this.signalingState === 'closed') {\n      throw new DOMException(\n        'The RTCPeerConnection\\'s signalingState is \\'closed\\'.',\n        'InvalidStateError');\n    }\n    const streams = [].slice.call(arguments, 1);\n    if (streams.length !== 1 ||\n        !streams[0].getTracks().find(t => t === track)) {\n      // this is not fully correct but all we can manage without\n      // [[associated MediaStreams]] internal slot.\n      throw new DOMException(\n        'The adapter.js addTrack polyfill only supports a single ' +\n        ' stream which is associated with the specified track.',\n        'NotSupportedError');\n    }\n\n    const alreadyExists = this.getSenders().find(s => s.track === track);\n    if (alreadyExists) {\n      throw new DOMException('Track already exists.',\n          'InvalidAccessError');\n    }\n\n    this._streams = this._streams || {};\n    this._reverseStreams = this._reverseStreams || {};\n    const oldStream = this._streams[stream.id];\n    if (oldStream) {\n      // this is using odd Chrome behaviour, use with caution:\n      // https://bugs.chromium.org/p/webrtc/issues/detail?id=7815\n      // Note: we rely on the high-level addTrack/dtmf shim to\n      // create the sender with a dtmf sender.\n      oldStream.addTrack(track);\n\n      // Trigger ONN async.\n      Promise.resolve().then(() => {\n        this.dispatchEvent(new Event('negotiationneeded'));\n      });\n    } else {\n      const newStream = new window.MediaStream([track]);\n      this._streams[stream.id] = newStream;\n      this._reverseStreams[newStream.id] = stream;\n      this.addStream(newStream);\n    }\n    return this.getSenders().find(s => s.track === track);\n  };\n\n  // replace the internal stream id with the external one and\n  // vice versa.\n  function replaceInternalStreamId(pc, description) {\n    let sdp = description.sdp;\n    Object.keys(pc._reverseStreams || []).forEach(internalId => {\n      const externalStream = pc._reverseStreams[internalId];\n      const internalStream = pc._streams[externalStream.id];\n      sdp = sdp.replace(new RegExp(internalStream.id, 'g'),\n          externalStream.id);\n    });\n    return new RTCSessionDescription({\n      type: description.type,\n      sdp\n    });\n  }\n  function replaceExternalStreamId(pc, description) {\n    let sdp = description.sdp;\n    Object.keys(pc._reverseStreams || []).forEach(internalId => {\n      const externalStream = pc._reverseStreams[internalId];\n      const internalStream = pc._streams[externalStream.id];\n      sdp = sdp.replace(new RegExp(externalStream.id, 'g'),\n          internalStream.id);\n    });\n    return new RTCSessionDescription({\n      type: description.type,\n      sdp\n    });\n  }\n  ['createOffer', 'createAnswer'].forEach(function(method) {\n    const nativeMethod = window.RTCPeerConnection.prototype[method];\n    window.RTCPeerConnection.prototype[method] = function() {\n      const args = arguments;\n      const isLegacyCall = arguments.length &&\n          typeof arguments[0] === 'function';\n      if (isLegacyCall) {\n        return nativeMethod.apply(this, [\n          (description) => {\n            const desc = replaceInternalStreamId(this, description);\n            args[0].apply(null, [desc]);\n          },\n          (err) => {\n            if (args[1]) {\n              args[1].apply(null, err);\n            }\n          }, arguments[2]\n        ]);\n      }\n      return nativeMethod.apply(this, arguments)\n      .then(description => replaceInternalStreamId(this, description));\n    };\n  });\n\n  const origSetLocalDescription =\n      window.RTCPeerConnection.prototype.setLocalDescription;\n  window.RTCPeerConnection.prototype.setLocalDescription = function() {\n    if (!arguments.length || !arguments[0].type) {\n      return origSetLocalDescription.apply(this, arguments);\n    }\n    arguments[0] = replaceExternalStreamId(this, arguments[0]);\n    return origSetLocalDescription.apply(this, arguments);\n  };\n\n  // TODO: mangle getStats: https://w3c.github.io/webrtc-stats/#dom-rtcmediastreamstats-streamidentifier\n\n  const origLocalDescription = Object.getOwnPropertyDescriptor(\n      window.RTCPeerConnection.prototype, 'localDescription');\n  Object.defineProperty(window.RTCPeerConnection.prototype,\n      'localDescription', {\n        get() {\n          const description = origLocalDescription.get.apply(this);\n          if (description.type === '') {\n            return description;\n          }\n          return replaceInternalStreamId(this, description);\n        }\n      });\n\n  window.RTCPeerConnection.prototype.removeTrack = function(sender) {\n    if (this.signalingState === 'closed') {\n      throw new DOMException(\n        'The RTCPeerConnection\\'s signalingState is \\'closed\\'.',\n        'InvalidStateError');\n    }\n    // We can not yet check for sender instanceof RTCRtpSender\n    // since we shim RTPSender. So we check if sender._pc is set.\n    if (!sender._pc) {\n      throw new DOMException('Argument 1 of RTCPeerConnection.removeTrack ' +\n          'does not implement interface RTCRtpSender.', 'TypeError');\n    }\n    const isLocal = sender._pc === this;\n    if (!isLocal) {\n      throw new DOMException('Sender was not created by this connection.',\n          'InvalidAccessError');\n    }\n\n    // Search for the native stream the senders track belongs to.\n    this._streams = this._streams || {};\n    let stream;\n    Object.keys(this._streams).forEach(streamid => {\n      const hasTrack = this._streams[streamid].getTracks()\n        .find(track => sender.track === track);\n      if (hasTrack) {\n        stream = this._streams[streamid];\n      }\n    });\n\n    if (stream) {\n      if (stream.getTracks().length === 1) {\n        // if this is the last track of the stream, remove the stream. This\n        // takes care of any shimmed _senders.\n        this.removeStream(this._reverseStreams[stream.id]);\n      } else {\n        // relying on the same odd chrome behaviour as above.\n        stream.removeTrack(sender.track);\n      }\n      this.dispatchEvent(new Event('negotiationneeded'));\n    }\n  };\n}\n\nexport function shimPeerConnection(window) {\n  if (!window.RTCPeerConnection && window.webkitRTCPeerConnection) {\n    // very basic support for old versions.\n    window.RTCPeerConnection = window.webkitRTCPeerConnection;\n  }\n  if (!window.RTCPeerConnection) {\n    return;\n  }\n\n  const origGetStats = window.RTCPeerConnection.prototype.getStats;\n  window.RTCPeerConnection.prototype.getStats = function(selector,\n      successCallback, errorCallback) {\n    const args = arguments;\n\n    // If selector is a function then we are in the old style stats so just\n    // pass back the original getStats format to avoid breaking old users.\n    if (arguments.length > 0 && typeof selector === 'function') {\n      return origGetStats.apply(this, arguments);\n    }\n\n    // When spec-style getStats is supported, return those when called with\n    // either no arguments or the selector argument is null.\n    if (origGetStats.length === 0 && (arguments.length === 0 ||\n        typeof arguments[0] !== 'function')) {\n      return origGetStats.apply(this, []);\n    }\n\n    const fixChromeStats_ = function(response) {\n      const standardReport = {};\n      const reports = response.result();\n      reports.forEach(report => {\n        const standardStats = {\n          id: report.id,\n          timestamp: report.timestamp,\n          type: {\n            localcandidate: 'local-candidate',\n            remotecandidate: 'remote-candidate'\n          }[report.type] || report.type\n        };\n        report.names().forEach(name => {\n          standardStats[name] = report.stat(name);\n        });\n        standardReport[standardStats.id] = standardStats;\n      });\n\n      return standardReport;\n    };\n\n    // shim getStats with maplike support\n    const makeMapStats = function(stats) {\n      return new Map(Object.keys(stats).map(key => [key, stats[key]]));\n    };\n\n    if (arguments.length >= 2) {\n      const successCallbackWrapper_ = function(response) {\n        args[1](makeMapStats(fixChromeStats_(response)));\n      };\n\n      return origGetStats.apply(this, [successCallbackWrapper_,\n        arguments[0]]);\n    }\n\n    // promise-support\n    return new Promise((resolve, reject) => {\n      origGetStats.apply(this, [\n        function(response) {\n          resolve(makeMapStats(fixChromeStats_(response)));\n        }, reject]);\n    }).then(successCallback, errorCallback);\n  };\n\n  // shim implicit creation of RTCSessionDescription/RTCIceCandidate\n  ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate']\n      .forEach(function(method) {\n        const nativeMethod = window.RTCPeerConnection.prototype[method];\n        window.RTCPeerConnection.prototype[method] = function() {\n          arguments[0] = new ((method === 'addIceCandidate') ?\n              window.RTCIceCandidate :\n              window.RTCSessionDescription)(arguments[0]);\n          return nativeMethod.apply(this, arguments);\n        };\n      });\n\n  // support for addIceCandidate(null or undefined)\n  const nativeAddIceCandidate =\n      window.RTCPeerConnection.prototype.addIceCandidate;\n  window.RTCPeerConnection.prototype.addIceCandidate = function() {\n    if (!arguments[0]) {\n      if (arguments[1]) {\n        arguments[1].apply(null);\n      }\n      return Promise.resolve();\n    }\n    return nativeAddIceCandidate.apply(this, arguments);\n  };\n}\n\nexport function fixNegotiationNeeded(window) {\n  utils.wrapPeerConnectionEvent(window, 'negotiationneeded', e => {\n    const pc = e.target;\n    if (pc.signalingState !== 'stable') {\n      return;\n    }\n    return e;\n  });\n}\n","/*\n *  Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\n\nimport * as utils from '../utils';\n// Edge does not like\n// 1) stun: filtered after 14393 unless ?transport=udp is present\n// 2) turn: that does not have all of turn:host:port?transport=udp\n// 3) turn: with ipv6 addresses\n// 4) turn: occurring muliple times\nexport function filterIceServers(iceServers, edgeVersion) {\n  let hasTurn = false;\n  iceServers = JSON.parse(JSON.stringify(iceServers));\n  return iceServers.filter(server => {\n    if (server && (server.urls || server.url)) {\n      var urls = server.urls || server.url;\n      if (server.url && !server.urls) {\n        utils.deprecated('RTCIceServer.url', 'RTCIceServer.urls');\n      }\n      const isString = typeof urls === 'string';\n      if (isString) {\n        urls = [urls];\n      }\n      urls = urls.filter(url => {\n        // filter STUN unconditionally.\n        if (url.indexOf('stun:') === 0) {\n          return false;\n        }\n\n        const validTurn = url.startsWith('turn') &&\n            !url.startsWith('turn:[') &&\n            url.includes('transport=udp');\n        if (validTurn && !hasTurn) {\n          hasTurn = true;\n          return true;\n        }\n        return validTurn && !hasTurn;\n      });\n\n      delete server.url;\n      server.urls = isString ? urls[0] : urls;\n      return !!urls.length;\n    }\n  });\n}\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n /* eslint-env node */\n'use strict';\n\nexport function shimGetUserMedia(window) {\n  const navigator = window && window.navigator;\n\n  const shimError_ = function(e) {\n    return {\n      name: {PermissionDeniedError: 'NotAllowedError'}[e.name] || e.name,\n      message: e.message,\n      constraint: e.constraint,\n      toString() {\n        return this.name;\n      }\n    };\n  };\n\n  // getUserMedia error shim.\n  const origGetUserMedia = navigator.mediaDevices.getUserMedia.\n      bind(navigator.mediaDevices);\n  navigator.mediaDevices.getUserMedia = function(c) {\n    return origGetUserMedia(c).catch(e => Promise.reject(shimError_(e)));\n  };\n}\n","/*\n *  Copyright (c) 2018 The adapter.js project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n /* eslint-env node */\n'use strict';\n\nexport function shimGetDisplayMedia(window) {\n  if (!('getDisplayMedia' in window.navigator)) {\n    return;\n  }\n  if (!(window.navigator.mediaDevices)) {\n    return;\n  }\n  if (window.navigator.mediaDevices &&\n    'getDisplayMedia' in window.navigator.mediaDevices) {\n    return;\n  }\n  window.navigator.mediaDevices.getDisplayMedia =\n    window.navigator.getDisplayMedia.bind(window.navigator.mediaDevices);\n}\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\n\nimport * as utils from '../utils';\nimport {filterIceServers} from './filtericeservers';\nimport shimRTCPeerConnection from 'rtcpeerconnection-shim';\n\nexport {shimGetUserMedia} from './getusermedia';\nexport {shimGetDisplayMedia} from './getdisplaymedia';\n\nexport function shimPeerConnection(window) {\n  const browserDetails = utils.detectBrowser(window);\n\n  if (window.RTCIceGatherer) {\n    if (!window.RTCIceCandidate) {\n      window.RTCIceCandidate = function(args) {\n        return args;\n      };\n    }\n    if (!window.RTCSessionDescription) {\n      window.RTCSessionDescription = function(args) {\n        return args;\n      };\n    }\n    // this adds an additional event listener to MediaStrackTrack that signals\n    // when a tracks enabled property was changed. Workaround for a bug in\n    // addStream, see below. No longer required in 15025+\n    if (browserDetails.version < 15025) {\n      const origMSTEnabled = Object.getOwnPropertyDescriptor(\n          window.MediaStreamTrack.prototype, 'enabled');\n      Object.defineProperty(window.MediaStreamTrack.prototype, 'enabled', {\n        set(value) {\n          origMSTEnabled.set.call(this, value);\n          const ev = new Event('enabled');\n          ev.enabled = value;\n          this.dispatchEvent(ev);\n        }\n      });\n    }\n  }\n\n  // ORTC defines the DTMF sender a bit different.\n  // https://github.com/w3c/ortc/issues/714\n  if (window.RTCRtpSender && !('dtmf' in window.RTCRtpSender.prototype)) {\n    Object.defineProperty(window.RTCRtpSender.prototype, 'dtmf', {\n      get() {\n        if (this._dtmf === undefined) {\n          if (this.track.kind === 'audio') {\n            this._dtmf = new window.RTCDtmfSender(this);\n          } else if (this.track.kind === 'video') {\n            this._dtmf = null;\n          }\n        }\n        return this._dtmf;\n      }\n    });\n  }\n  // Edge currently only implements the RTCDtmfSender, not the\n  // RTCDTMFSender alias. See http://draft.ortc.org/#rtcdtmfsender2*\n  if (window.RTCDtmfSender && !window.RTCDTMFSender) {\n    window.RTCDTMFSender = window.RTCDtmfSender;\n  }\n\n  const RTCPeerConnectionShim = shimRTCPeerConnection(window,\n      browserDetails.version);\n  window.RTCPeerConnection = function(config) {\n    if (config && config.iceServers) {\n      config.iceServers = filterIceServers(config.iceServers,\n        browserDetails.version);\n      utils.log('ICE servers after filtering:', config.iceServers);\n    }\n    return new RTCPeerConnectionShim(config);\n  };\n  window.RTCPeerConnection.prototype = RTCPeerConnectionShim.prototype;\n}\n\nexport function shimReplaceTrack(window) {\n  // ORTC has replaceTrack -- https://github.com/w3c/ortc/issues/614\n  if (window.RTCRtpSender &&\n      !('replaceTrack' in window.RTCRtpSender.prototype)) {\n    window.RTCRtpSender.prototype.replaceTrack =\n        window.RTCRtpSender.prototype.setTrack;\n  }\n}\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\n\nimport * as utils from '../utils';\n\nexport function shimGetUserMedia(window) {\n  const browserDetails = utils.detectBrowser(window);\n  const navigator = window && window.navigator;\n  const MediaStreamTrack = window && window.MediaStreamTrack;\n\n  navigator.getUserMedia = function(constraints, onSuccess, onError) {\n    // Replace Firefox 44+'s deprecation warning with unprefixed version.\n    utils.deprecated('navigator.getUserMedia',\n        'navigator.mediaDevices.getUserMedia');\n    navigator.mediaDevices.getUserMedia(constraints).then(onSuccess, onError);\n  };\n\n  if (!(browserDetails.version > 55 &&\n      'autoGainControl' in navigator.mediaDevices.getSupportedConstraints())) {\n    const remap = function(obj, a, b) {\n      if (a in obj && !(b in obj)) {\n        obj[b] = obj[a];\n        delete obj[a];\n      }\n    };\n\n    const nativeGetUserMedia = navigator.mediaDevices.getUserMedia.\n        bind(navigator.mediaDevices);\n    navigator.mediaDevices.getUserMedia = function(c) {\n      if (typeof c === 'object' && typeof c.audio === 'object') {\n        c = JSON.parse(JSON.stringify(c));\n        remap(c.audio, 'autoGainControl', 'mozAutoGainControl');\n        remap(c.audio, 'noiseSuppression', 'mozNoiseSuppression');\n      }\n      return nativeGetUserMedia(c);\n    };\n\n    if (MediaStreamTrack && MediaStreamTrack.prototype.getSettings) {\n      const nativeGetSettings = MediaStreamTrack.prototype.getSettings;\n      MediaStreamTrack.prototype.getSettings = function() {\n        const obj = nativeGetSettings.apply(this, arguments);\n        remap(obj, 'mozAutoGainControl', 'autoGainControl');\n        remap(obj, 'mozNoiseSuppression', 'noiseSuppression');\n        return obj;\n      };\n    }\n\n    if (MediaStreamTrack && MediaStreamTrack.prototype.applyConstraints) {\n      const nativeApplyConstraints =\n        MediaStreamTrack.prototype.applyConstraints;\n      MediaStreamTrack.prototype.applyConstraints = function(c) {\n        if (this.kind === 'audio' && typeof c === 'object') {\n          c = JSON.parse(JSON.stringify(c));\n          remap(c, 'autoGainControl', 'mozAutoGainControl');\n          remap(c, 'noiseSuppression', 'mozNoiseSuppression');\n        }\n        return nativeApplyConstraints.apply(this, [c]);\n      };\n    }\n  }\n}\n","/*\n *  Copyright (c) 2018 The adapter.js project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\n\nexport function shimGetDisplayMedia(window, preferredMediaSource) {\n  if (window.navigator.mediaDevices &&\n    'getDisplayMedia' in window.navigator.mediaDevices) {\n    return;\n  }\n  if (!(window.navigator.mediaDevices)) {\n    return;\n  }\n  window.navigator.mediaDevices.getDisplayMedia = function(constraints) {\n    if (!(constraints && constraints.video)) {\n      const err = new DOMException('getDisplayMedia without video ' +\n          'constraints is undefined');\n      err.name = 'NotFoundError';\n      // from https://heycam.github.io/webidl/#idl-DOMException-error-names\n      err.code = 8;\n      return Promise.reject(err);\n    }\n    if (constraints.video === true) {\n      constraints.video = {mediaSource: preferredMediaSource};\n    } else {\n      constraints.video.mediaSource = preferredMediaSource;\n    }\n    return window.navigator.mediaDevices.getUserMedia(constraints);\n  };\n}\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\n\nimport * as utils from '../utils';\nexport {shimGetUserMedia} from './getusermedia';\nexport {shimGetDisplayMedia} from './getdisplaymedia';\n\nexport function shimOnTrack(window) {\n  if (typeof window === 'object' && window.RTCTrackEvent &&\n      ('receiver' in window.RTCTrackEvent.prototype) &&\n      !('transceiver' in window.RTCTrackEvent.prototype)) {\n    Object.defineProperty(window.RTCTrackEvent.prototype, 'transceiver', {\n      get() {\n        return {receiver: this.receiver};\n      }\n    });\n  }\n}\n\nexport function shimPeerConnection(window) {\n  const browserDetails = utils.detectBrowser(window);\n\n  if (typeof window !== 'object' ||\n      !(window.RTCPeerConnection || window.mozRTCPeerConnection)) {\n    return; // probably media.peerconnection.enabled=false in about:config\n  }\n  if (!window.RTCPeerConnection && window.mozRTCPeerConnection) {\n    // very basic support for old versions.\n    window.RTCPeerConnection = window.mozRTCPeerConnection;\n  }\n\n  // shim away need for obsolete RTCIceCandidate/RTCSessionDescription.\n  ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate']\n      .forEach(function(method) {\n        const nativeMethod = window.RTCPeerConnection.prototype[method];\n        window.RTCPeerConnection.prototype[method] = function() {\n          arguments[0] = new ((method === 'addIceCandidate') ?\n              window.RTCIceCandidate :\n              window.RTCSessionDescription)(arguments[0]);\n          return nativeMethod.apply(this, arguments);\n        };\n      });\n\n  // support for addIceCandidate(null or undefined)\n  const nativeAddIceCandidate =\n      window.RTCPeerConnection.prototype.addIceCandidate;\n  window.RTCPeerConnection.prototype.addIceCandidate = function() {\n    if (!arguments[0]) {\n      if (arguments[1]) {\n        arguments[1].apply(null);\n      }\n      return Promise.resolve();\n    }\n    return nativeAddIceCandidate.apply(this, arguments);\n  };\n\n  const modernStatsTypes = {\n    inboundrtp: 'inbound-rtp',\n    outboundrtp: 'outbound-rtp',\n    candidatepair: 'candidate-pair',\n    localcandidate: 'local-candidate',\n    remotecandidate: 'remote-candidate'\n  };\n\n  const nativeGetStats = window.RTCPeerConnection.prototype.getStats;\n  window.RTCPeerConnection.prototype.getStats = function(\n    selector,\n    onSucc,\n    onErr\n  ) {\n    return nativeGetStats.apply(this, [selector || null])\n      .then(stats => {\n        if (browserDetails.version < 53 && !onSucc) {\n          // Shim only promise getStats with spec-hyphens in type names\n          // Leave callback version alone; misc old uses of forEach before Map\n          try {\n            stats.forEach(stat => {\n              stat.type = modernStatsTypes[stat.type] || stat.type;\n            });\n          } catch (e) {\n            if (e.name !== 'TypeError') {\n              throw e;\n            }\n            // Avoid TypeError: \"type\" is read-only, in old versions. 34-43ish\n            stats.forEach((stat, i) => {\n              stats.set(i, Object.assign({}, stat, {\n                type: modernStatsTypes[stat.type] || stat.type\n              }));\n            });\n          }\n        }\n        return stats;\n      })\n      .then(onSucc, onErr);\n  };\n}\n\nexport function shimSenderGetStats(window) {\n  if (!(typeof window === 'object' && window.RTCPeerConnection &&\n      window.RTCRtpSender)) {\n    return;\n  }\n  if (window.RTCRtpSender && 'getStats' in window.RTCRtpSender.prototype) {\n    return;\n  }\n  const origGetSenders = window.RTCPeerConnection.prototype.getSenders;\n  if (origGetSenders) {\n    window.RTCPeerConnection.prototype.getSenders = function() {\n      const senders = origGetSenders.apply(this, []);\n      senders.forEach(sender => sender._pc = this);\n      return senders;\n    };\n  }\n\n  const origAddTrack = window.RTCPeerConnection.prototype.addTrack;\n  if (origAddTrack) {\n    window.RTCPeerConnection.prototype.addTrack = function() {\n      const sender = origAddTrack.apply(this, arguments);\n      sender._pc = this;\n      return sender;\n    };\n  }\n  window.RTCRtpSender.prototype.getStats = function() {\n    return this.track ? this._pc.getStats(this.track) :\n        Promise.resolve(new Map());\n  };\n}\n\nexport function shimReceiverGetStats(window) {\n  if (!(typeof window === 'object' && window.RTCPeerConnection &&\n      window.RTCRtpSender)) {\n    return;\n  }\n  if (window.RTCRtpSender && 'getStats' in window.RTCRtpReceiver.prototype) {\n    return;\n  }\n  const origGetReceivers = window.RTCPeerConnection.prototype.getReceivers;\n  if (origGetReceivers) {\n    window.RTCPeerConnection.prototype.getReceivers = function() {\n      const receivers = origGetReceivers.apply(this, []);\n      receivers.forEach(receiver => receiver._pc = this);\n      return receivers;\n    };\n  }\n  utils.wrapPeerConnectionEvent(window, 'track', e => {\n    e.receiver._pc = e.srcElement;\n    return e;\n  });\n  window.RTCRtpReceiver.prototype.getStats = function() {\n    return this._pc.getStats(this.track);\n  };\n}\n\nexport function shimRemoveStream(window) {\n  if (!window.RTCPeerConnection ||\n      'removeStream' in window.RTCPeerConnection.prototype) {\n    return;\n  }\n  window.RTCPeerConnection.prototype.removeStream = function(stream) {\n    utils.deprecated('removeStream', 'removeTrack');\n    this.getSenders().forEach(sender => {\n      if (sender.track && stream.getTracks().includes(sender.track)) {\n        this.removeTrack(sender);\n      }\n    });\n  };\n}\n\nexport function shimRTCDataChannel(window) {\n  // rename DataChannel to RTCDataChannel (native fix in FF60):\n  // https://bugzilla.mozilla.org/show_bug.cgi?id=1173851\n  if (window.DataChannel && !window.RTCDataChannel) {\n    window.RTCDataChannel = window.DataChannel;\n  }\n}\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n'use strict';\nimport * as utils from '../utils';\n\nexport function shimLocalStreamsAPI(window) {\n  if (typeof window !== 'object' || !window.RTCPeerConnection) {\n    return;\n  }\n  if (!('getLocalStreams' in window.RTCPeerConnection.prototype)) {\n    window.RTCPeerConnection.prototype.getLocalStreams = function() {\n      if (!this._localStreams) {\n        this._localStreams = [];\n      }\n      return this._localStreams;\n    };\n  }\n  if (!('addStream' in window.RTCPeerConnection.prototype)) {\n    const _addTrack = window.RTCPeerConnection.prototype.addTrack;\n    window.RTCPeerConnection.prototype.addStream = function(stream) {\n      if (!this._localStreams) {\n        this._localStreams = [];\n      }\n      if (!this._localStreams.includes(stream)) {\n        this._localStreams.push(stream);\n      }\n      stream.getTracks().forEach(track => _addTrack.call(this, track, stream));\n    };\n\n    window.RTCPeerConnection.prototype.addTrack = function(track, stream) {\n      if (stream) {\n        if (!this._localStreams) {\n          this._localStreams = [stream];\n        } else if (!this._localStreams.includes(stream)) {\n          this._localStreams.push(stream);\n        }\n      }\n      return _addTrack.call(this, track, stream);\n    };\n  }\n  if (!('removeStream' in window.RTCPeerConnection.prototype)) {\n    window.RTCPeerConnection.prototype.removeStream = function(stream) {\n      if (!this._localStreams) {\n        this._localStreams = [];\n      }\n      const index = this._localStreams.indexOf(stream);\n      if (index === -1) {\n        return;\n      }\n      this._localStreams.splice(index, 1);\n      const tracks = stream.getTracks();\n      this.getSenders().forEach(sender => {\n        if (tracks.includes(sender.track)) {\n          this.removeTrack(sender);\n        }\n      });\n    };\n  }\n}\n\nexport function shimRemoteStreamsAPI(window) {\n  if (typeof window !== 'object' || !window.RTCPeerConnection) {\n    return;\n  }\n  if (!('getRemoteStreams' in window.RTCPeerConnection.prototype)) {\n    window.RTCPeerConnection.prototype.getRemoteStreams = function() {\n      return this._remoteStreams ? this._remoteStreams : [];\n    };\n  }\n  if (!('onaddstream' in window.RTCPeerConnection.prototype)) {\n    Object.defineProperty(window.RTCPeerConnection.prototype, 'onaddstream', {\n      get() {\n        return this._onaddstream;\n      },\n      set(f) {\n        if (this._onaddstream) {\n          this.removeEventListener('addstream', this._onaddstream);\n          this.removeEventListener('track', this._onaddstreampoly);\n        }\n        this.addEventListener('addstream', this._onaddstream = f);\n        this.addEventListener('track', this._onaddstreampoly = (e) => {\n          e.streams.forEach(stream => {\n            if (!this._remoteStreams) {\n              this._remoteStreams = [];\n            }\n            if (this._remoteStreams.includes(stream)) {\n              return;\n            }\n            this._remoteStreams.push(stream);\n            const event = new Event('addstream');\n            event.stream = stream;\n            this.dispatchEvent(event);\n          });\n        });\n      }\n    });\n    const origSetRemoteDescription =\n      window.RTCPeerConnection.prototype.setRemoteDescription;\n    window.RTCPeerConnection.prototype.setRemoteDescription = function() {\n      const pc = this;\n      if (!this._onaddstreampoly) {\n        this.addEventListener('track', this._onaddstreampoly = function(e) {\n          e.streams.forEach(stream => {\n            if (!pc._remoteStreams) {\n              pc._remoteStreams = [];\n            }\n            if (pc._remoteStreams.indexOf(stream) >= 0) {\n              return;\n            }\n            pc._remoteStreams.push(stream);\n            const event = new Event('addstream');\n            event.stream = stream;\n            pc.dispatchEvent(event);\n          });\n        });\n      }\n      return origSetRemoteDescription.apply(pc, arguments);\n    };\n  }\n}\n\nexport function shimCallbacksAPI(window) {\n  if (typeof window !== 'object' || !window.RTCPeerConnection) {\n    return;\n  }\n  const prototype = window.RTCPeerConnection.prototype;\n  const createOffer = prototype.createOffer;\n  const createAnswer = prototype.createAnswer;\n  const setLocalDescription = prototype.setLocalDescription;\n  const setRemoteDescription = prototype.setRemoteDescription;\n  const addIceCandidate = prototype.addIceCandidate;\n\n  prototype.createOffer = function(successCallback, failureCallback) {\n    const options = (arguments.length >= 2) ? arguments[2] : arguments[0];\n    const promise = createOffer.apply(this, [options]);\n    if (!failureCallback) {\n      return promise;\n    }\n    promise.then(successCallback, failureCallback);\n    return Promise.resolve();\n  };\n\n  prototype.createAnswer = function(successCallback, failureCallback) {\n    const options = (arguments.length >= 2) ? arguments[2] : arguments[0];\n    const promise = createAnswer.apply(this, [options]);\n    if (!failureCallback) {\n      return promise;\n    }\n    promise.then(successCallback, failureCallback);\n    return Promise.resolve();\n  };\n\n  let withCallback = function(description, successCallback, failureCallback) {\n    const promise = setLocalDescription.apply(this, [description]);\n    if (!failureCallback) {\n      return promise;\n    }\n    promise.then(successCallback, failureCallback);\n    return Promise.resolve();\n  };\n  prototype.setLocalDescription = withCallback;\n\n  withCallback = function(description, successCallback, failureCallback) {\n    const promise = setRemoteDescription.apply(this, [description]);\n    if (!failureCallback) {\n      return promise;\n    }\n    promise.then(successCallback, failureCallback);\n    return Promise.resolve();\n  };\n  prototype.setRemoteDescription = withCallback;\n\n  withCallback = function(candidate, successCallback, failureCallback) {\n    const promise = addIceCandidate.apply(this, [candidate]);\n    if (!failureCallback) {\n      return promise;\n    }\n    promise.then(successCallback, failureCallback);\n    return Promise.resolve();\n  };\n  prototype.addIceCandidate = withCallback;\n}\n\nexport function shimGetUserMedia(window) {\n  const navigator = window && window.navigator;\n\n  if (navigator.mediaDevices && navigator.mediaDevices.getUserMedia) {\n    // shim not needed in Safari 12.1\n    const mediaDevices = navigator.mediaDevices;\n    const _getUserMedia = mediaDevices.getUserMedia.bind(mediaDevices);\n    navigator.mediaDevices.getUserMedia = (constraints) => {\n      return _getUserMedia(shimConstraints(constraints));\n    };\n  }\n\n  if (!navigator.getUserMedia && navigator.mediaDevices &&\n    navigator.mediaDevices.getUserMedia) {\n    navigator.getUserMedia = function(constraints, cb, errcb) {\n      navigator.mediaDevices.getUserMedia(constraints)\n      .then(cb, errcb);\n    }.bind(navigator);\n  }\n}\n\nexport function shimConstraints(constraints) {\n  if (constraints && constraints.video !== undefined) {\n    return Object.assign({},\n      constraints,\n      {video: utils.compactObject(constraints.video)}\n    );\n  }\n\n  return constraints;\n}\n\nexport function shimRTCIceServerUrls(window) {\n  // migrate from non-spec RTCIceServer.url to RTCIceServer.urls\n  const OrigPeerConnection = window.RTCPeerConnection;\n  window.RTCPeerConnection = function(pcConfig, pcConstraints) {\n    if (pcConfig && pcConfig.iceServers) {\n      const newIceServers = [];\n      for (let i = 0; i < pcConfig.iceServers.length; i++) {\n        let server = pcConfig.iceServers[i];\n        if (!server.hasOwnProperty('urls') &&\n            server.hasOwnProperty('url')) {\n          utils.deprecated('RTCIceServer.url', 'RTCIceServer.urls');\n          server = JSON.parse(JSON.stringify(server));\n          server.urls = server.url;\n          delete server.url;\n          newIceServers.push(server);\n        } else {\n          newIceServers.push(pcConfig.iceServers[i]);\n        }\n      }\n      pcConfig.iceServers = newIceServers;\n    }\n    return new OrigPeerConnection(pcConfig, pcConstraints);\n  };\n  window.RTCPeerConnection.prototype = OrigPeerConnection.prototype;\n  // wrap static methods. Currently just generateCertificate.\n  if ('generateCertificate' in window.RTCPeerConnection) {\n    Object.defineProperty(window.RTCPeerConnection, 'generateCertificate', {\n      get() {\n        return OrigPeerConnection.generateCertificate;\n      }\n    });\n  }\n}\n\nexport function shimTrackEventTransceiver(window) {\n  // Add event.transceiver member over deprecated event.receiver\n  if (typeof window === 'object' && window.RTCPeerConnection &&\n      ('receiver' in window.RTCTrackEvent.prototype) &&\n      // can't check 'transceiver' in window.RTCTrackEvent.prototype, as it is\n      // defined for some reason even when window.RTCTransceiver is not.\n      !window.RTCTransceiver) {\n    Object.defineProperty(window.RTCTrackEvent.prototype, 'transceiver', {\n      get() {\n        return {receiver: this.receiver};\n      }\n    });\n  }\n}\n\nexport function shimCreateOfferLegacy(window) {\n  const origCreateOffer = window.RTCPeerConnection.prototype.createOffer;\n  window.RTCPeerConnection.prototype.createOffer = function(offerOptions) {\n    if (offerOptions) {\n      if (typeof offerOptions.offerToReceiveAudio !== 'undefined') {\n        // support bit values\n        offerOptions.offerToReceiveAudio = !!offerOptions.offerToReceiveAudio;\n      }\n      const audioTransceiver = this.getTransceivers().find(transceiver =>\n        transceiver.sender.track &&\n        transceiver.sender.track.kind === 'audio');\n      if (offerOptions.offerToReceiveAudio === false && audioTransceiver) {\n        if (audioTransceiver.direction === 'sendrecv') {\n          if (audioTransceiver.setDirection) {\n            audioTransceiver.setDirection('sendonly');\n          } else {\n            audioTransceiver.direction = 'sendonly';\n          }\n        } else if (audioTransceiver.direction === 'recvonly') {\n          if (audioTransceiver.setDirection) {\n            audioTransceiver.setDirection('inactive');\n          } else {\n            audioTransceiver.direction = 'inactive';\n          }\n        }\n      } else if (offerOptions.offerToReceiveAudio === true &&\n          !audioTransceiver) {\n        this.addTransceiver('audio');\n      }\n\n      if (typeof offerOptions.offerToReceiveVideo !== 'undefined') {\n        // support bit values\n        offerOptions.offerToReceiveVideo = !!offerOptions.offerToReceiveVideo;\n      }\n      const videoTransceiver = this.getTransceivers().find(transceiver =>\n        transceiver.sender.track &&\n        transceiver.sender.track.kind === 'video');\n      if (offerOptions.offerToReceiveVideo === false && videoTransceiver) {\n        if (videoTransceiver.direction === 'sendrecv') {\n          if (videoTransceiver.setDirection) {\n            videoTransceiver.setDirection('sendonly');\n          } else {\n            videoTransceiver.direction = 'sendonly';\n          }\n        } else if (videoTransceiver.direction === 'recvonly') {\n          if (videoTransceiver.setDirection) {\n            videoTransceiver.setDirection('inactive');\n          } else {\n            videoTransceiver.direction = 'inactive';\n          }\n        }\n      } else if (offerOptions.offerToReceiveVideo === true &&\n          !videoTransceiver) {\n        this.addTransceiver('video');\n      }\n    }\n    return origCreateOffer.apply(this, arguments);\n  };\n}\n","/*\n *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\n\nimport SDPUtils from 'sdp';\nimport * as utils from './utils';\n\nexport function shimRTCIceCandidate(window) {\n  // foundation is arbitrarily chosen as an indicator for full support for\n  // https://w3c.github.io/webrtc-pc/#rtcicecandidate-interface\n  if (!window.RTCIceCandidate || (window.RTCIceCandidate && 'foundation' in\n      window.RTCIceCandidate.prototype)) {\n    return;\n  }\n\n  const NativeRTCIceCandidate = window.RTCIceCandidate;\n  window.RTCIceCandidate = function(args) {\n    // Remove the a= which shouldn't be part of the candidate string.\n    if (typeof args === 'object' && args.candidate &&\n        args.candidate.indexOf('a=') === 0) {\n      args = JSON.parse(JSON.stringify(args));\n      args.candidate = args.candidate.substr(2);\n    }\n\n    if (args.candidate && args.candidate.length) {\n      // Augment the native candidate with the parsed fields.\n      const nativeCandidate = new NativeRTCIceCandidate(args);\n      const parsedCandidate = SDPUtils.parseCandidate(args.candidate);\n      const augmentedCandidate = Object.assign(nativeCandidate,\n          parsedCandidate);\n\n      // Add a serializer that does not serialize the extra attributes.\n      augmentedCandidate.toJSON = function() {\n        return {\n          candidate: augmentedCandidate.candidate,\n          sdpMid: augmentedCandidate.sdpMid,\n          sdpMLineIndex: augmentedCandidate.sdpMLineIndex,\n          usernameFragment: augmentedCandidate.usernameFragment,\n        };\n      };\n      return augmentedCandidate;\n    }\n    return new NativeRTCIceCandidate(args);\n  };\n  window.RTCIceCandidate.prototype = NativeRTCIceCandidate.prototype;\n\n  // Hook up the augmented candidate in onicecandidate and\n  // addEventListener('icecandidate', ...)\n  utils.wrapPeerConnectionEvent(window, 'icecandidate', e => {\n    if (e.candidate) {\n      Object.defineProperty(e, 'candidate', {\n        value: new window.RTCIceCandidate(e.candidate),\n        writable: 'false'\n      });\n    }\n    return e;\n  });\n}\n\nexport function shimMaxMessageSize(window) {\n  if (window.RTCSctpTransport || !window.RTCPeerConnection) {\n    return;\n  }\n  const browserDetails = utils.detectBrowser(window);\n\n  if (!('sctp' in window.RTCPeerConnection.prototype)) {\n    Object.defineProperty(window.RTCPeerConnection.prototype, 'sctp', {\n      get() {\n        return typeof this._sctp === 'undefined' ? null : this._sctp;\n      }\n    });\n  }\n\n  const sctpInDescription = function(description) {\n    const sections = SDPUtils.splitSections(description.sdp);\n    sections.shift();\n    return sections.some(mediaSection => {\n      const mLine = SDPUtils.parseMLine(mediaSection);\n      return mLine && mLine.kind === 'application'\n          && mLine.protocol.indexOf('SCTP') !== -1;\n    });\n  };\n\n  const getRemoteFirefoxVersion = function(description) {\n    // TODO: Is there a better solution for detecting Firefox?\n    const match = description.sdp.match(/mozilla...THIS_IS_SDPARTA-(\\d+)/);\n    if (match === null || match.length < 2) {\n      return -1;\n    }\n    const version = parseInt(match[1], 10);\n    // Test for NaN (yes, this is ugly)\n    return version !== version ? -1 : version;\n  };\n\n  const getCanSendMaxMessageSize = function(remoteIsFirefox) {\n    // Every implementation we know can send at least 64 KiB.\n    // Note: Although Chrome is technically able to send up to 256 KiB, the\n    //       data does not reach the other peer reliably.\n    //       See: https://bugs.chromium.org/p/webrtc/issues/detail?id=8419\n    let canSendMaxMessageSize = 65536;\n    if (browserDetails.browser === 'firefox') {\n      if (browserDetails.version < 57) {\n        if (remoteIsFirefox === -1) {\n          // FF < 57 will send in 16 KiB chunks using the deprecated PPID\n          // fragmentation.\n          canSendMaxMessageSize = 16384;\n        } else {\n          // However, other FF (and RAWRTC) can reassemble PPID-fragmented\n          // messages. Thus, supporting ~2 GiB when sending.\n          canSendMaxMessageSize = 2147483637;\n        }\n      } else if (browserDetails.version < 60) {\n        // Currently, all FF >= 57 will reset the remote maximum message size\n        // to the default value when a data channel is created at a later\n        // stage. :(\n        // See: https://bugzilla.mozilla.org/show_bug.cgi?id=1426831\n        canSendMaxMessageSize =\n          browserDetails.version === 57 ? 65535 : 65536;\n      } else {\n        // FF >= 60 supports sending ~2 GiB\n        canSendMaxMessageSize = 2147483637;\n      }\n    }\n    return canSendMaxMessageSize;\n  };\n\n  const getMaxMessageSize = function(description, remoteIsFirefox) {\n    // Note: 65536 bytes is the default value from the SDP spec. Also,\n    //       every implementation we know supports receiving 65536 bytes.\n    let maxMessageSize = 65536;\n\n    // FF 57 has a slightly incorrect default remote max message size, so\n    // we need to adjust it here to avoid a failure when sending.\n    // See: https://bugzilla.mozilla.org/show_bug.cgi?id=1425697\n    if (browserDetails.browser === 'firefox'\n         && browserDetails.version === 57) {\n      maxMessageSize = 65535;\n    }\n\n    const match = SDPUtils.matchPrefix(description.sdp,\n      'a=max-message-size:');\n    if (match.length > 0) {\n      maxMessageSize = parseInt(match[0].substr(19), 10);\n    } else if (browserDetails.browser === 'firefox' &&\n                remoteIsFirefox !== -1) {\n      // If the maximum message size is not present in the remote SDP and\n      // both local and remote are Firefox, the remote peer can receive\n      // ~2 GiB.\n      maxMessageSize = 2147483637;\n    }\n    return maxMessageSize;\n  };\n\n  const origSetRemoteDescription =\n      window.RTCPeerConnection.prototype.setRemoteDescription;\n  window.RTCPeerConnection.prototype.setRemoteDescription = function() {\n    this._sctp = null;\n\n    if (sctpInDescription(arguments[0])) {\n      // Check if the remote is FF.\n      const isFirefox = getRemoteFirefoxVersion(arguments[0]);\n\n      // Get the maximum message size the local peer is capable of sending\n      const canSendMMS = getCanSendMaxMessageSize(isFirefox);\n\n      // Get the maximum message size of the remote peer.\n      const remoteMMS = getMaxMessageSize(arguments[0], isFirefox);\n\n      // Determine final maximum message size\n      let maxMessageSize;\n      if (canSendMMS === 0 && remoteMMS === 0) {\n        maxMessageSize = Number.POSITIVE_INFINITY;\n      } else if (canSendMMS === 0 || remoteMMS === 0) {\n        maxMessageSize = Math.max(canSendMMS, remoteMMS);\n      } else {\n        maxMessageSize = Math.min(canSendMMS, remoteMMS);\n      }\n\n      // Create a dummy RTCSctpTransport object and the 'maxMessageSize'\n      // attribute.\n      const sctp = {};\n      Object.defineProperty(sctp, 'maxMessageSize', {\n        get() {\n          return maxMessageSize;\n        }\n      });\n      this._sctp = sctp;\n    }\n\n    return origSetRemoteDescription.apply(this, arguments);\n  };\n}\n\nexport function shimSendThrowTypeError(window) {\n  if (!(window.RTCPeerConnection &&\n      'createDataChannel' in window.RTCPeerConnection.prototype)) {\n    return;\n  }\n\n  // Note: Although Firefox >= 57 has a native implementation, the maximum\n  //       message size can be reset for all data channels at a later stage.\n  //       See: https://bugzilla.mozilla.org/show_bug.cgi?id=1426831\n\n  function wrapDcSend(dc, pc) {\n    const origDataChannelSend = dc.send;\n    dc.send = function() {\n      const data = arguments[0];\n      const length = data.length || data.size || data.byteLength;\n      if (dc.readyState === 'open' &&\n          pc.sctp && length > pc.sctp.maxMessageSize) {\n        throw new TypeError('Message too large (can send a maximum of ' +\n          pc.sctp.maxMessageSize + ' bytes)');\n      }\n      return origDataChannelSend.apply(dc, arguments);\n    };\n  }\n  const origCreateDataChannel =\n    window.RTCPeerConnection.prototype.createDataChannel;\n  window.RTCPeerConnection.prototype.createDataChannel = function() {\n    const dataChannel = origCreateDataChannel.apply(this, arguments);\n    wrapDcSend(dataChannel, this);\n    return dataChannel;\n  };\n  utils.wrapPeerConnectionEvent(window, 'datachannel', e => {\n    wrapDcSend(e.channel, e.target);\n    return e;\n  });\n}\n\n\n/* shims RTCConnectionState by pretending it is the same as iceConnectionState.\n * See https://bugs.chromium.org/p/webrtc/issues/detail?id=6145#c12\n * for why this is a valid hack in Chrome. In Firefox it is slightly incorrect\n * since DTLS failures would be hidden. See\n * https://bugzilla.mozilla.org/show_bug.cgi?id=1265827\n * for the Firefox tracking bug.\n */\nexport function shimConnectionState(window) {\n  if (!window.RTCPeerConnection ||\n      'connectionState' in window.RTCPeerConnection.prototype) {\n    return;\n  }\n  const proto = window.RTCPeerConnection.prototype;\n  Object.defineProperty(proto, 'connectionState', {\n    get() {\n      return {\n        completed: 'connected',\n        checking: 'connecting'\n      }[this.iceConnectionState] || this.iceConnectionState;\n    },\n    enumerable: true,\n    configurable: true\n  });\n  Object.defineProperty(proto, 'onconnectionstatechange', {\n    get() {\n      return this._onconnectionstatechange || null;\n    },\n    set(cb) {\n      if (this._onconnectionstatechange) {\n        this.removeEventListener('connectionstatechange',\n            this._onconnectionstatechange);\n        delete this._onconnectionstatechange;\n      }\n      if (cb) {\n        this.addEventListener('connectionstatechange',\n            this._onconnectionstatechange = cb);\n      }\n    },\n    enumerable: true,\n    configurable: true\n  });\n\n  ['setLocalDescription', 'setRemoteDescription'].forEach((method) => {\n    const origMethod = proto[method];\n    proto[method] = function() {\n      if (!this._connectionstatechangepoly) {\n        this._connectionstatechangepoly = e => {\n          const pc = e.target;\n          if (pc._lastConnectionState !== pc.connectionState) {\n            pc._lastConnectionState = pc.connectionState;\n            const newEvent = new Event('connectionstatechange', e);\n            pc.dispatchEvent(newEvent);\n          }\n          return e;\n        };\n        this.addEventListener('iceconnectionstatechange',\n          this._connectionstatechangepoly);\n      }\n      return origMethod.apply(this, arguments);\n    };\n  });\n}\n\nexport function removeAllowExtmapMixed(window) {\n  /* remove a=extmap-allow-mixed for Chrome < M71 */\n  if (!window.RTCPeerConnection) {\n    return;\n  }\n  const browserDetails = utils.detectBrowser(window);\n  if (browserDetails.browser === 'chrome' && browserDetails.version >= 71) {\n    return;\n  }\n  const nativeSRD = window.RTCPeerConnection.prototype.setRemoteDescription;\n  window.RTCPeerConnection.prototype.setRemoteDescription = function(desc) {\n    if (desc && desc.sdp && desc.sdp.indexOf('\\na=extmap-allow-mixed') !== -1) {\n      desc.sdp = desc.sdp.split('\\n').filter((line) => {\n        return line.trim() !== 'a=extmap-allow-mixed';\n      }).join('\\n');\n    }\n    return nativeSRD.apply(this, arguments);\n  };\n}\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\nimport * as utils from './utils';\n\n  // Browser shims.\nimport * as chromeShim from './chrome/chrome_shim';\nimport * as edgeShim from './edge/edge_shim';\nimport * as firefoxShim from './firefox/firefox_shim';\nimport * as safariShim from './safari/safari_shim';\nimport * as commonShim from './common_shim';\n\n// Shimming starts here.\nexport function adapterFactory({window} = {}, options = {\n  shimChrome: true,\n  shimFirefox: true,\n  shimEdge: true,\n  shimSafari: true,\n}) {\n  // Utils.\n  const logging = utils.log;\n  const browserDetails = utils.detectBrowser(window);\n\n  const adapter = {\n    browserDetails,\n    commonShim,\n    extractVersion: utils.extractVersion,\n    disableLog: utils.disableLog,\n    disableWarnings: utils.disableWarnings\n  };\n\n  // Shim browser if found.\n  switch (browserDetails.browser) {\n    case 'chrome':\n      if (!chromeShim || !chromeShim.shimPeerConnection ||\n          !options.shimChrome) {\n        logging('Chrome shim is not included in this adapter release.');\n        return adapter;\n      }\n      logging('adapter.js shimming chrome.');\n      // Export to the adapter global object visible in the browser.\n      adapter.browserShim = chromeShim;\n\n      chromeShim.shimGetUserMedia(window);\n      chromeShim.shimMediaStream(window);\n      chromeShim.shimPeerConnection(window);\n      chromeShim.shimOnTrack(window);\n      chromeShim.shimAddTrackRemoveTrack(window);\n      chromeShim.shimGetSendersWithDtmf(window);\n      chromeShim.shimSenderReceiverGetStats(window);\n      chromeShim.fixNegotiationNeeded(window);\n\n      commonShim.shimRTCIceCandidate(window);\n      commonShim.shimConnectionState(window);\n      commonShim.shimMaxMessageSize(window);\n      commonShim.shimSendThrowTypeError(window);\n      commonShim.removeAllowExtmapMixed(window);\n      break;\n    case 'firefox':\n      if (!firefoxShim || !firefoxShim.shimPeerConnection ||\n          !options.shimFirefox) {\n        logging('Firefox shim is not included in this adapter release.');\n        return adapter;\n      }\n      logging('adapter.js shimming firefox.');\n      // Export to the adapter global object visible in the browser.\n      adapter.browserShim = firefoxShim;\n\n      firefoxShim.shimGetUserMedia(window);\n      firefoxShim.shimPeerConnection(window);\n      firefoxShim.shimOnTrack(window);\n      firefoxShim.shimRemoveStream(window);\n      firefoxShim.shimSenderGetStats(window);\n      firefoxShim.shimReceiverGetStats(window);\n      firefoxShim.shimRTCDataChannel(window);\n\n      commonShim.shimRTCIceCandidate(window);\n      commonShim.shimConnectionState(window);\n      commonShim.shimMaxMessageSize(window);\n      commonShim.shimSendThrowTypeError(window);\n      break;\n    case 'edge':\n      if (!edgeShim || !edgeShim.shimPeerConnection || !options.shimEdge) {\n        logging('MS edge shim is not included in this adapter release.');\n        return adapter;\n      }\n      logging('adapter.js shimming edge.');\n      // Export to the adapter global object visible in the browser.\n      adapter.browserShim = edgeShim;\n\n      edgeShim.shimGetUserMedia(window);\n      edgeShim.shimGetDisplayMedia(window);\n      edgeShim.shimPeerConnection(window);\n      edgeShim.shimReplaceTrack(window);\n\n      // the edge shim implements the full RTCIceCandidate object.\n\n      commonShim.shimMaxMessageSize(window);\n      commonShim.shimSendThrowTypeError(window);\n      break;\n    case 'safari':\n      if (!safariShim || !options.shimSafari) {\n        logging('Safari shim is not included in this adapter release.');\n        return adapter;\n      }\n      logging('adapter.js shimming safari.');\n      // Export to the adapter global object visible in the browser.\n      adapter.browserShim = safariShim;\n\n      safariShim.shimRTCIceServerUrls(window);\n      safariShim.shimCreateOfferLegacy(window);\n      safariShim.shimCallbacksAPI(window);\n      safariShim.shimLocalStreamsAPI(window);\n      safariShim.shimRemoteStreamsAPI(window);\n      safariShim.shimTrackEventTransceiver(window);\n      safariShim.shimGetUserMedia(window);\n\n      commonShim.shimRTCIceCandidate(window);\n      commonShim.shimMaxMessageSize(window);\n      commonShim.shimSendThrowTypeError(window);\n      commonShim.removeAllowExtmapMixed(window);\n      break;\n    default:\n      logging('Unsupported browser!');\n      break;\n  }\n\n  return adapter;\n}\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n\n'use strict';\n\nimport {adapterFactory} from './adapter_factory.js';\n\nconst adapter = adapterFactory({window});\nexport default adapter;\n","var render = function() {\n  var _vm = this\n  var _h = _vm.$createElement\n  var _c = _vm._self._c || _h\n  return _vm._m(0)\n}\nvar staticRenderFns = [\n  function() {\n    var _vm = this\n    var _h = _vm.$createElement\n    var _c = _vm._self._c || _h\n    return _c(\n      \"div\",\n      { staticClass: \"viewport scanner\", attrs: { id: \"interactive\" } },\n      [_c(\"video\"), _vm._v(\" \"), _c(\"canvas\", { staticClass: \"drawingBuffer\" })]\n    )\n  }\n]\nrender._withStripped = true\n\nexport { render, staticRenderFns }","<template>\n  <div id=\"interactive\" class=\"viewport scanner\">\n    <video />\n    <canvas class=\"drawingBuffer\" />\n  </div>\n</template>\n\n<script>\nimport Quagga from 'quagga';\n\nexport default {\n  name: 'QuaggaScanner',\n  props: {\n    onDetected: {\n      type: Function,\n      default(result) {\n        console.log('detected: ', result);\n      },\n    },\n    onProcessed: {\n      type: Function,\n      default(result) {\n        let drawingCtx = Quagga.canvas.ctx.overlay;\n\n        let drawingCanvas = Quagga.canvas.dom.overlay;\n\n        if (result) {\n          if (result.boxes) {\n            drawingCtx.clearRect(\n              0,\n              0,\n              parseInt(drawingCanvas.getAttribute('width')),\n              parseInt(drawingCanvas.getAttribute('height'))\n            );\n            result.boxes\n              .filter(function(box) {\n                return box !== result.box;\n              })\n              .forEach(function(box) {\n                Quagga.ImageDebug.drawPath(box, { x: 0, y: 1 }, drawingCtx, {\n                  color: 'green',\n                  lineWidth: 2,\n                });\n              });\n          }\n          if (result.box) {\n            Quagga.ImageDebug.drawPath(result.box, { x: 0, y: 1 }, drawingCtx, {\n              color: '#00F',\n              lineWidth: 2,\n            });\n          }\n\n          if (result.codeResult && result.codeResult.code) {\n            Quagga.ImageDebug.drawPath(\n              result.line,\n              { x: 'x', y: 'y' },\n              drawingCtx,\n              { color: 'red', lineWidth: 3 }\n            );\n          }\n        }\n      },\n    },\n    readerTypes: {\n      type: Array,\n      default: () => ['code_128_reader'],\n    },\n    readerSize: {\n      type: Object,\n      default: () => ({\n        width: 640,\n        height: 480,\n      }),\n      validator: o =>\n        typeof o.width === 'number' && typeof o.width === 'number',\n    },\n  },\n  data: function() {\n    return {\n      quaggaState: {\n        inputStream: {\n          type: 'LiveStream',\n          constraints: {\n            width: { min: this.readerSize.width },\n            height: { min: this.readerSize.height },\n            facingMode: 'environment',\n            aspectRatio: { min: 1, max: 2 },\n          },\n        },\n        locator: {\n          patchSize: 'medium',\n          halfSample: true,\n        },\n        numOfWorkers: 2,\n        frequency: 10,\n        decoder: {\n          readers: this.readerTypes,\n        },\n        locate: true,\n      },\n    };\n  },\n  mounted: function() {\n    Quagga.init(this.quaggaState, function(err) {\n      if (err) {\n        return console.log(err);\n      }\n      Quagga.start();\n    });\n    Quagga.onDetected(this.onDetected);\n    Quagga.onProcessed(this.onProcessed);\n  },\n  destroyed: function() {\n    Quagga.stop();\n  },\n};\n</script>\n\n<style scoped>\n.viewport {\n  position: relative;\n}\n\n.viewport canvas,\n.viewport video {\n  position: absolute;\n  left: 0;\n  top: 0;\n}\n</style>\n","import mod from \"-!../node_modules/babel-loader/lib/index.js!../node_modules/vue-loader/lib/index.js??vue-loader-options!./Scanner.vue?vue&type=script&lang=js&\"; export default mod; export * from \"-!../node_modules/babel-loader/lib/index.js!../node_modules/vue-loader/lib/index.js??vue-loader-options!./Scanner.vue?vue&type=script&lang=js&\"","/* globals __VUE_SSR_CONTEXT__ */\n\n// IMPORTANT: Do NOT use ES2015 features in this file (except for modules).\n// This module is a runtime utility for cleaner component module output and will\n// be included in the final webpack user bundle.\n\nexport default function normalizeComponent (\n  scriptExports,\n  render,\n  staticRenderFns,\n  functionalTemplate,\n  injectStyles,\n  scopeId,\n  moduleIdentifier, /* server only */\n  shadowMode /* vue-cli only */\n) {\n  // Vue.extend constructor export interop\n  var options = typeof scriptExports === 'function'\n    ? scriptExports.options\n    : scriptExports\n\n  // render functions\n  if (render) {\n    options.render = render\n    options.staticRenderFns = staticRenderFns\n    options._compiled = true\n  }\n\n  // functional template\n  if (functionalTemplate) {\n    options.functional = true\n  }\n\n  // scopedId\n  if (scopeId) {\n    options._scopeId = 'data-v-' + scopeId\n  }\n\n  var hook\n  if (moduleIdentifier) { // server build\n    hook = function (context) {\n      // 2.3 injection\n      context =\n        context || // cached call\n        (this.$vnode && this.$vnode.ssrContext) || // stateful\n        (this.parent && this.parent.$vnode && this.parent.$vnode.ssrContext) // functional\n      // 2.2 with runInNewContext: true\n      if (!context && typeof __VUE_SSR_CONTEXT__ !== 'undefined') {\n        context = __VUE_SSR_CONTEXT__\n      }\n      // inject component styles\n      if (injectStyles) {\n        injectStyles.call(this, context)\n      }\n      // register component module identifier for async chunk inferrence\n      if (context && context._registeredComponents) {\n        context._registeredComponents.add(moduleIdentifier)\n      }\n    }\n    // used by ssr in case component is cached and beforeCreate\n    // never gets called\n    options._ssrRegister = hook\n  } else if (injectStyles) {\n    hook = shadowMode\n      ? function () { injectStyles.call(this, this.$root.$options.shadowRoot) }\n      : injectStyles\n  }\n\n  if (hook) {\n    if (options.functional) {\n      // for template-only hot-reload because in that case the render fn doesn't\n      // go through the normalizer\n      options._injectStyles = hook\n      // register for functioal component in vue file\n      var originalRender = options.render\n      options.render = function renderWithStyleInjection (h, context) {\n        hook.call(context)\n        return originalRender(h, context)\n      }\n    } else {\n      // inject component registration as beforeCreate hook\n      var existing = options.beforeCreate\n      options.beforeCreate = existing\n        ? [].concat(existing, hook)\n        : [hook]\n    }\n  }\n\n  return {\n    exports: scriptExports,\n    options: options\n  }\n}\n","import { render, staticRenderFns } from \"./Scanner.vue?vue&type=template&id=4ebacf15&scoped=true&\"\nimport script from \"./Scanner.vue?vue&type=script&lang=js&\"\nexport * from \"./Scanner.vue?vue&type=script&lang=js&\"\nimport style0 from \"./Scanner.vue?vue&type=style&index=0&id=4ebacf15&scoped=true&lang=css&\"\n\n\n/* normalize component */\nimport normalizer from \"!../node_modules/vue-loader/lib/runtime/componentNormalizer.js\"\nvar component = normalizer(\n  script,\n  render,\n  staticRenderFns,\n  false,\n  null,\n  \"4ebacf15\",\n  null\n  \n)\n\n/* hot reload */\nif (module.hot) {\n  var api = require(\"/Users/mathieu/workspace_vendor/vue-quagga/node_modules/vue-hot-reload-api/dist/index.js\")\n  api.install(require('vue'))\n  if (api.compatible) {\n    module.hot.accept()\n    if (!module.hot.data) {\n      api.createRecord('4ebacf15', component.options)\n    } else {\n      api.reload('4ebacf15', component.options)\n    }\n    module.hot.accept(\"./Scanner.vue?vue&type=template&id=4ebacf15&scoped=true&\", function () {\n      api.rerender('4ebacf15', {\n        render: render,\n        staticRenderFns: staticRenderFns\n      })\n    })\n  }\n}\ncomponent.options.__file = \"src/Scanner.vue\"\nexport default component.exports","import 'webrtc-adapter';\nimport Scanner from './Scanner.vue';\n\nexport default {\n  install: function(Vue, options) {\n    Vue.component('v-quagga', Scanner);\n  },\n};\n","/**\n * Translates the list format produced by css-loader into something\n * easier to manipulate.\n */\nexport default function listToStyles (parentId, list) {\n  var styles = []\n  var newStyles = {}\n  for (var i = 0; i < list.length; i++) {\n    var item = list[i]\n    var id = item[0]\n    var css = item[1]\n    var media = item[2]\n    var sourceMap = item[3]\n    var part = {\n      id: parentId + ':' + i,\n      css: css,\n      media: media,\n      sourceMap: sourceMap\n    }\n    if (!newStyles[id]) {\n      styles.push(newStyles[id] = { id: id, parts: [part] })\n    } else {\n      newStyles[id].parts.push(part)\n    }\n  }\n  return styles\n}\n","/*\n  MIT License http://www.opensource.org/licenses/mit-license.php\n  Author Tobias Koppers @sokra\n  Modified by Evan You @yyx990803\n*/\n\nimport listToStyles from './listToStyles'\n\nvar hasDocument = typeof document !== 'undefined'\n\nif (typeof DEBUG !== 'undefined' && DEBUG) {\n  if (!hasDocument) {\n    throw new Error(\n    'vue-style-loader cannot be used in a non-browser environment. ' +\n    \"Use { target: 'node' } in your Webpack config to indicate a server-rendering environment.\"\n  ) }\n}\n\n/*\ntype StyleObject = {\n  id: number;\n  parts: Array<StyleObjectPart>\n}\n\ntype StyleObjectPart = {\n  css: string;\n  media: string;\n  sourceMap: ?string\n}\n*/\n\nvar stylesInDom = {/*\n  [id: number]: {\n    id: number,\n    refs: number,\n    parts: Array<(obj?: StyleObjectPart) => void>\n  }\n*/}\n\nvar head = hasDocument && (document.head || document.getElementsByTagName('head')[0])\nvar singletonElement = null\nvar singletonCounter = 0\nvar isProduction = false\nvar noop = function () {}\nvar options = null\nvar ssrIdKey = 'data-vue-ssr-id'\n\n// Force single-tag solution on IE6-9, which has a hard limit on the # of <style>\n// tags it will allow on a page\nvar isOldIE = typeof navigator !== 'undefined' && /msie [6-9]\\b/.test(navigator.userAgent.toLowerCase())\n\nexport default function addStylesClient (parentId, list, _isProduction, _options) {\n  isProduction = _isProduction\n\n  options = _options || {}\n\n  var styles = listToStyles(parentId, list)\n  addStylesToDom(styles)\n\n  return function update (newList) {\n    var mayRemove = []\n    for (var i = 0; i < styles.length; i++) {\n      var item = styles[i]\n      var domStyle = stylesInDom[item.id]\n      domStyle.refs--\n      mayRemove.push(domStyle)\n    }\n    if (newList) {\n      styles = listToStyles(parentId, newList)\n      addStylesToDom(styles)\n    } else {\n      styles = []\n    }\n    for (var i = 0; i < mayRemove.length; i++) {\n      var domStyle = mayRemove[i]\n      if (domStyle.refs === 0) {\n        for (var j = 0; j < domStyle.parts.length; j++) {\n          domStyle.parts[j]()\n        }\n        delete stylesInDom[domStyle.id]\n      }\n    }\n  }\n}\n\nfunction addStylesToDom (styles /* Array<StyleObject> */) {\n  for (var i = 0; i < styles.length; i++) {\n    var item = styles[i]\n    var domStyle = stylesInDom[item.id]\n    if (domStyle) {\n      domStyle.refs++\n      for (var j = 0; j < domStyle.parts.length; j++) {\n        domStyle.parts[j](item.parts[j])\n      }\n      for (; j < item.parts.length; j++) {\n        domStyle.parts.push(addStyle(item.parts[j]))\n      }\n      if (domStyle.parts.length > item.parts.length) {\n        domStyle.parts.length = item.parts.length\n      }\n    } else {\n      var parts = []\n      for (var j = 0; j < item.parts.length; j++) {\n        parts.push(addStyle(item.parts[j]))\n      }\n      stylesInDom[item.id] = { id: item.id, refs: 1, parts: parts }\n    }\n  }\n}\n\nfunction createStyleElement () {\n  var styleElement = document.createElement('style')\n  styleElement.type = 'text/css'\n  head.appendChild(styleElement)\n  return styleElement\n}\n\nfunction addStyle (obj /* StyleObjectPart */) {\n  var update, remove\n  var styleElement = document.querySelector('style[' + ssrIdKey + '~=\"' + obj.id + '\"]')\n\n  if (styleElement) {\n    if (isProduction) {\n      // has SSR styles and in production mode.\n      // simply do nothing.\n      return noop\n    } else {\n      // has SSR styles but in dev mode.\n      // for some reason Chrome can't handle source map in server-rendered\n      // style tags - source maps in <style> only works if the style tag is\n      // created and inserted dynamically. So we remove the server rendered\n      // styles and inject new ones.\n      styleElement.parentNode.removeChild(styleElement)\n    }\n  }\n\n  if (isOldIE) {\n    // use singleton mode for IE9.\n    var styleIndex = singletonCounter++\n    styleElement = singletonElement || (singletonElement = createStyleElement())\n    update = applyToSingletonTag.bind(null, styleElement, styleIndex, false)\n    remove = applyToSingletonTag.bind(null, styleElement, styleIndex, true)\n  } else {\n    // use multi-style-tag mode in all other cases\n    styleElement = createStyleElement()\n    update = applyToTag.bind(null, styleElement)\n    remove = function () {\n      styleElement.parentNode.removeChild(styleElement)\n    }\n  }\n\n  update(obj)\n\n  return function updateStyle (newObj /* StyleObjectPart */) {\n    if (newObj) {\n      if (newObj.css === obj.css &&\n          newObj.media === obj.media &&\n          newObj.sourceMap === obj.sourceMap) {\n        return\n      }\n      update(obj = newObj)\n    } else {\n      remove()\n    }\n  }\n}\n\nvar replaceText = (function () {\n  var textStore = []\n\n  return function (index, replacement) {\n    textStore[index] = replacement\n    return textStore.filter(Boolean).join('\\n')\n  }\n})()\n\nfunction applyToSingletonTag (styleElement, index, remove, obj) {\n  var css = remove ? '' : obj.css\n\n  if (styleElement.styleSheet) {\n    styleElement.styleSheet.cssText = replaceText(index, css)\n  } else {\n    var cssNode = document.createTextNode(css)\n    var childNodes = styleElement.childNodes\n    if (childNodes[index]) styleElement.removeChild(childNodes[index])\n    if (childNodes.length) {\n      styleElement.insertBefore(cssNode, childNodes[index])\n    } else {\n      styleElement.appendChild(cssNode)\n    }\n  }\n}\n\nfunction applyToTag (styleElement, obj) {\n  var css = obj.css\n  var media = obj.media\n  var sourceMap = obj.sourceMap\n\n  if (media) {\n    styleElement.setAttribute('media', media)\n  }\n  if (options.ssrId) {\n    styleElement.setAttribute(ssrIdKey, obj.id)\n  }\n\n  if (sourceMap) {\n    // https://developer.chrome.com/devtools/docs/javascript-debugging\n    // this makes source maps inside style tags work properly in Chrome\n    css += '\\n/*# sourceURL=' + sourceMap.sources[0] + ' */'\n    // http://stackoverflow.com/a/26603875\n    css += '\\n/*# sourceMappingURL=data:application/json;base64,' + btoa(unescape(encodeURIComponent(JSON.stringify(sourceMap)))) + ' */'\n  }\n\n  if (styleElement.styleSheet) {\n    styleElement.styleSheet.cssText = css\n  } else {\n    while (styleElement.firstChild) {\n      styleElement.removeChild(styleElement.firstChild)\n    }\n    styleElement.appendChild(document.createTextNode(css))\n  }\n}\n"],"sourceRoot":""}
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{yStart1=offset - size|0;yStart2=offset+size|0;xStart1=u - 1|0;xStart2=u+1|0;sum=(images[inImagePtr+yStart1+xStart1|0]|0)+(images[inImagePtr+yStart1+xStart2|0]|0)+(images[inImagePtr+offset+u|0]|0)+(images[inImagePtr+yStart2+xStart1|0]|0)+(images[inImagePtr+yStart2+xStart2|0]|0)|0;if ((sum|0) == (5|0)) {images[outImagePtr+offset+u|0]=1;} else {images[outImagePtr+offset+u|0]=0;}}}return;}function subtract(aImagePtr, bImagePtr, outImagePtr) {aImagePtr=aImagePtr|0;bImagePtr=bImagePtr|0;outImagePtr=outImagePtr|0;var length=0;length=imul(size, size)|0;while ((length|0)>0) {length=length - 1|0;images[outImagePtr+length|0]=(images[aImagePtr+length|0]|0) - (images[bImagePtr+length|0]|0)|0;}}function bitwiseOr(aImagePtr, bImagePtr, outImagePtr) {aImagePtr=aImagePtr|0;bImagePtr=bImagePtr|0;outImagePtr=outImagePtr|0;var length=0;length=imul(size, size)|0;while ((length|0)>0) {length=length - 1|0;images[outImagePtr+length|0]=images[aImagePtr+length|0]|0|(images[bImagePtr+length|0]|0)|0;}}function countNonZero(imagePtr) {imagePtr=imagePtr|0;var sum=0,length=0;length=imul(size, size)|0;while ((length|0)>0) {length=length - 1|0;sum=(sum|0)+(images[imagePtr+length|0]|0)|0;}return sum|0;}function init(imagePtr, value) {imagePtr=imagePtr|0;value=value|0;var length=0;length=imul(size, size)|0;while ((length|0)>0) {length=length - 1|0;images[imagePtr+length|0]=value;}}function dilate(inImagePtr, outImagePtr) {inImagePtr=inImagePtr|0;outImagePtr=outImagePtr|0;var v=0,u=0,sum=0,yStart1=0,yStart2=0,xStart1=0,xStart2=0,offset=0;for (v=1; (v|0)<(size - 1|0); v=v+1|0) {offset=offset+size|0;for (u=1; (u|0)<(size - 1|0); u=u+1|0) {yStart1=offset - size|0;yStart2=offset+size|0;xStart1=u - 1|0;xStart2=u+1|0;sum=(images[inImagePtr+yStart1+xStart1|0]|0)+(images[inImagePtr+yStart1+xStart2|0]|0)+(images[inImagePtr+offset+u|0]|0)+(images[inImagePtr+yStart2+xStart1|0]|0)+(images[inImagePtr+yStart2+xStart2|0]|0)|0;if ((sum|0)>(0|0)) {images[outImagePtr+offset+u|0]=1;} else {images[outImagePtr+offset+u|0]=0;}}}return;}function memcpy(srcImagePtr, dstImagePtr) {srcImagePtr=srcImagePtr|0;dstImagePtr=dstImagePtr|0;var length=0;length=imul(size, size)|0;while ((length|0)>0) {length=length - 1|0;images[dstImagePtr+length|0]=images[srcImagePtr+length|0]|0;}}function zeroBorder(imagePtr) {imagePtr=imagePtr|0;var x=0,y=0;for (x=0; (x|0)<(size - 1|0); x=x+1|0) {images[imagePtr+x|0]=0;images[imagePtr+y|0]=0;y=y+size - 1|0;images[imagePtr+y|0]=0;y=y+1|0;}for (x=0; (x|0)<(size|0); x=x+1|0) {images[imagePtr+y|0]=0;y=y+1|0;}}function skeletonize() {var subImagePtr=0,erodedImagePtr=0,tempImagePtr=0,skelImagePtr=0,sum=0,done=0;erodedImagePtr=imul(size, size)|0;tempImagePtr=erodedImagePtr+erodedImagePtr|0;skelImagePtr=tempImagePtr+erodedImagePtr|0;init(skelImagePtr, 0);zeroBorder(subImagePtr);do {erode(subImagePtr, erodedImagePtr);dilate(erodedImagePtr, tempImagePtr);subtract(subImagePtr, tempImagePtr, tempImagePtr);bitwiseOr(skelImagePtr, tempImagePtr, skelImagePtr);memcpy(erodedImagePtr, subImagePtr);sum=countNonZero(subImagePtr)|0;done=(sum|0) == 0|0;} while (!done);}return {skeletonize: skeletonize};} __webpack_exports__[\"a\"]=Skeletonizer; },function(t,e,n){\"use strict\";function r(t){o.a.call(this,t),this.barSpaceRatio=[1,1]}var o=n(1),i=1,a=3,u={START_PATTERN:{value:[a,i,a,i,i,i]},STOP_PATTERN:{value:[a,i,i,i,a]},CODE_PATTERN:{value:[[i,i,a,a,i],[a,i,i,i,a],[i,a,i,i,a],[a,a,i,i,i],[i,i,a,i,a],[a,i,a,i,i],[i,a,a,i,i],[i,i,i,a,a],[a,i,i,a,i],[i,a,i,a,i]]},SINGLE_CODE_ERROR:{value:.78,writable:!0},AVG_CODE_ERROR:{value:.3,writable:!0},FORMAT:{value:\"2of5\"}},c=u.START_PATTERN.value.reduce(function(t,e){return t+e},0);r.prototype=Object.create(o.a.prototype,u),r.prototype.constructor=r,r.prototype._findPattern=function(t,e,n,r){var o,i,a,u,c=[],s=this,f=0,l={error:Number.MAX_VALUE,code:-1,start:0,end:0},d=s.AVG_CODE_ERROR;for(n=n||!1,r=r||!1,e||(e=s._nextSet(s._row)),o=0;o<t.length;o++)c[o]=0;for(o=e;o<s._row.length;o++)if(s._row[o]^n)c[f]++;else{if(f===c.length-1){for(u=0,a=0;a<c.length;a++)u+=c[a];if((i=s._matchPattern(c,t))<d)return l.error=i,l.start=o-u,l.end=o,l;if(!r)return null;for(a=0;a<c.length-2;a++)c[a]=c[a+2];c[c.length-2]=0,c[c.length-1]=0,f--}else f++;c[f]=1,n=!n}return null},r.prototype._findStart=function(){for(var t,e,n=this,r=n._nextSet(n._row),o=1;!e;){if(!(e=n._findPattern(n.START_PATTERN,r,!1,!0)))return null;if(o=Math.floor((e.end-e.start)/c),(t=e.start-5*o)>=0&&n._matchRange(t,e.start,0))return e;r=e.end,e=null}},r.prototype._verifyTrailingWhitespace=function(t){var e,n=this;return e=t.end+(t.end-t.start)/2,e<n._row.length&&n._matchRange(t.end,e,0)?t:null},r.prototype._findEnd=function(){var t,e,n,r=this;return r._row.reverse(),n=r._nextSet(r._row),t=r._findPattern(r.STOP_PATTERN,n,!1,!0),r._row.reverse(),null===t?null:(e=t.start,t.start=r._row.length-t.end,t.end=r._row.length-e,null!==t?r._verifyTrailingWhitespace(t):null)},r.prototype._decodeCode=function(t){var e,n,r,o=this,i=0,a=o.AVG_CODE_ERROR,u={error:Number.MAX_VALUE,code:-1,start:0,end:0};for(e=0;e<t.length;e++)i+=t[e];for(r=0;r<o.CODE_PATTERN.length;r++)(n=o._matchPattern(t,o.CODE_PATTERN[r]))<u.error&&(u.code=r,u.error=n);if(u.error<a)return u},r.prototype._decodePayload=function(t,e,n){for(var r,o,i=this,a=0,u=t.length,c=[0,0,0,0,0];a<u;){for(r=0;r<5;r++)c[r]=t[a]*this.barSpaceRatio[0],a+=2;if(!(o=i._decodeCode(c)))return null;e.push(o.code+\"\"),n.push(o)}return o},r.prototype._verifyCounterLength=function(t){return t.length%10==0},r.prototype._decode=function(){var t,e,n,r=this,o=[],i=[];return(t=r._findStart())?(i.push(t),(e=r._findEnd())?(n=r._fillCounters(t.end,e.start,!1),r._verifyCounterLength(n)&&r._decodePayload(n,o,i)?o.length<5?null:(i.push(e),{code:o.join(\"\"),start:t.start,end:e.end,startInfo:t,decodedCodes:i}):null):null):null},e.a=r},function(t,e,n){\"use strict\";function r(){o.a.call(this),this._counters=[]}var o=n(1),i={ALPHABETH_STRING:{value:\"0123456789-$:/.+ABCD\"},ALPHABET:{value:[48,49,50,51,52,53,54,55,56,57,45,36,58,47,46,43,65,66,67,68]},CHARACTER_ENCODINGS:{value:[3,6,9,96,18,66,33,36,48,72,12,24,69,81,84,21,26,41,11,14]},START_END:{value:[26,41,11,14]},MIN_ENCODED_CHARS:{value:4},MAX_ACCEPTABLE:{value:2},PADDING:{value:1.5},FORMAT:{value:\"codabar\",writeable:!1}};r.prototype=Object.create(o.a.prototype,i),r.prototype.constructor=r,r.prototype._decode=function(){var t,e,n,r,o,i=this,a=[];if(this._counters=i._fillCounters(),!(t=i._findStart()))return null;r=t.startCounter;do{if((n=i._toPattern(r))<0)return null;if((e=i._patternToChar(n))<0)return null;if(a.push(e),r+=8,a.length>1&&i._isStartEnd(n))break}while(r<i._counters.length);return a.length-2<i.MIN_ENCODED_CHARS||!i._isStartEnd(n)?null:i._verifyWhitespace(t.startCounter,r-8)&&i._validateResult(a,t.startCounter)?(r=r>i._counters.length?i._counters.length:r,o=t.start+i._sumCounters(t.startCounter,r-8),{code:a.join(\"\"),start:t.start,end:o,startInfo:t,decodedCodes:a}):null},r.prototype._verifyWhitespace=function(t,e){return(t-1<=0||this._counters[t-1]>=this._calculatePatternLength(t)/2)&&(e+8>=this._counters.length||this._counters[e+7]>=this._calculatePatternLength(e)/2)},r.prototype._calculatePatternLength=function(t){var e,n=0;for(e=t;e<t+7;e++)n+=this._counters[e];return n},r.prototype._thresholdResultPattern=function(t,e){var n,r,o,i,a,u=this,c={space:{narrow:{size:0,counts:0,min:0,max:Number.MAX_VALUE},wide:{size:0,counts:0,min:0,max:Number.MAX_VALUE}},bar:{narrow:{size:0,counts:0,min:0,max:Number.MAX_VALUE},wide:{size:0,counts:0,min:0,max:Number.MAX_VALUE}}},s=e;for(o=0;o<t.length;o++){for(a=u._charToPattern(t[o]),i=6;i>=0;i--)n=2==(1&i)?c.bar:c.space,r=1==(1&a)?n.wide:n.narrow,r.size+=u._counters[s+i],r.counts++,a>>=1;s+=8}return[\"space\",\"bar\"].forEach(function(t){var e=c[t];e.wide.min=Math.floor((e.narrow.size/e.narrow.counts+e.wide.size/e.wide.counts)/2),e.narrow.max=Math.ceil(e.wide.min),e.wide.max=Math.ceil((e.wide.size*u.MAX_ACCEPTABLE+u.PADDING)/e.wide.counts)}),c},r.prototype._charToPattern=function(t){var e,n=this,r=t.charCodeAt(0);for(e=0;e<n.ALPHABET.length;e++)if(n.ALPHABET[e]===r)return n.CHARACTER_ENCODINGS[e];return 0},r.prototype._validateResult=function(t,e){var n,r,o,i,a,u,c=this,s=c._thresholdResultPattern(t,e),f=e;for(n=0;n<t.length;n++){for(u=c._charToPattern(t[n]),r=6;r>=0;r--){if(o=0==(1&r)?s.bar:s.space,i=1==(1&u)?o.wide:o.narrow,(a=c._counters[f+r])<i.min||a>i.max)return!1;u>>=1}f+=8}return!0},r.prototype._patternToChar=function(t){var e,n=this;for(e=0;e<n.CHARACTER_ENCODINGS.length;e++)if(n.CHARACTER_ENCODINGS[e]===t)return String.fromCharCode(n.ALPHABET[e]);return-1},r.prototype._computeAlternatingThreshold=function(t,e){var n,r,o=Number.MAX_VALUE,i=0;for(n=t;n<e;n+=2)r=this._counters[n],r>i&&(i=r),r<o&&(o=r);return(o+i)/2|0},r.prototype._toPattern=function(t){var e,n,r,o,i=7,a=t+i,u=1<<i-1,c=0;if(a>this._counters.length)return-1;for(e=this._computeAlternatingThreshold(t,a),n=this._computeAlternatingThreshold(t+1,a),r=0;r<i;r++)o=0==(1&r)?e:n,this._counters[t+r]>o&&(c|=u),u>>=1;return c},r.prototype._isStartEnd=function(t){var e;for(e=0;e<this.START_END.length;e++)if(this.START_END[e]===t)return!0;return!1},r.prototype._sumCounters=function(t,e){var n,r=0;for(n=t;n<e;n++)r+=this._counters[n];return r},r.prototype._findStart=function(){var t,e,n,r=this,o=r._nextUnset(r._row);for(t=1;t<this._counters.length;t++)if((e=r._toPattern(t))!==-1&&r._isStartEnd(e))return o+=r._sumCounters(0,t),n=o+r._sumCounters(t,t+8),{start:o,end:n,startCounter:t,endCounter:t+8}},e.a=r},function(t,e,n){\"use strict\";function r(){i.a.call(this)}function o(t,e,n){for(var r=n.length,o=0,i=0;r--;)i+=t[n[r]],o+=e[n[r]];return i/o}var i=n(1),a={CODE_SHIFT:{value:98},CODE_C:{value:99},CODE_B:{value:100},CODE_A:{value:101},START_CODE_A:{value:103},START_CODE_B:{value:104},START_CODE_C:{value:105},STOP_CODE:{value:106},CODE_PATTERN:{value:[[2,1,2,2,2,2],[2,2,2,1,2,2],[2,2,2,2,2,1],[1,2,1,2,2,3],[1,2,1,3,2,2],[1,3,1,2,2,2],[1,2,2,2,1,3],[1,2,2,3,1,2],[1,3,2,2,1,2],[2,2,1,2,1,3],[2,2,1,3,1,2],[2,3,1,2,1,2],[1,1,2,2,3,2],[1,2,2,1,3,2],[1,2,2,2,3,1],[1,1,3,2,2,2],[1,2,3,1,2,2],[1,2,3,2,2,1],[2,2,3,2,1,1],[2,2,1,1,3,2],[2,2,1,2,3,1],[2,1,3,2,1,2],[2,2,3,1,1,2],[3,1,2,1,3,1],[3,1,1,2,2,2],[3,2,1,1,2,2],[3,2,1,2,2,1],[3,1,2,2,1,2],[3,2,2,1,1,2],[3,2,2,2,1,1],[2,1,2,1,2,3],[2,1,2,3,2,1],[2,3,2,1,2,1],[1,1,1,3,2,3],[1,3,1,1,2,3],[1,3,1,3,2,1],[1,1,2,3,1,3],[1,3,2,1,1,3],[1,3,2,3,1,1],[2,1,1,3,1,3],[2,3,1,1,1,3],[2,3,1,3,1,1],[1,1,2,1,3,3],[1,1,2,3,3,1],[1,3,2,1,3,1],[1,1,3,1,2,3],[1,1,3,3,2,1],[1,3,3,1,2,1],[3,1,3,1,2,1],[2,1,1,3,3,1],[2,3,1,1,3,1],[2,1,3,1,1,3],[2,1,3,3,1,1],[2,1,3,1,3,1],[3,1,1,1,2,3],[3,1,1,3,2,1],[3,3,1,1,2,1],[3,1,2,1,1,3],[3,1,2,3,1,1],[3,3,2,1,1,1],[3,1,4,1,1,1],[2,2,1,4,1,1],[4,3,1,1,1,1],[1,1,1,2,2,4],[1,1,1,4,2,2],[1,2,1,1,2,4],[1,2,1,4,2,1],[1,4,1,1,2,2],[1,4,1,2,2,1],[1,1,2,2,1,4],[1,1,2,4,1,2],[1,2,2,1,1,4],[1,2,2,4,1,1],[1,4,2,1,1,2],[1,4,2,2,1,1],[2,4,1,2,1,1],[2,2,1,1,1,4],[4,1,3,1,1,1],[2,4,1,1,1,2],[1,3,4,1,1,1],[1,1,1,2,4,2],[1,2,1,1,4,2],[1,2,1,2,4,1],[1,1,4,2,1,2],[1,2,4,1,1,2],[1,2,4,2,1,1],[4,1,1,2,1,2],[4,2,1,1,1,2],[4,2,1,2,1,1],[2,1,2,1,4,1],[2,1,4,1,2,1],[4,1,2,1,2,1],[1,1,1,1,4,3],[1,1,1,3,4,1],[1,3,1,1,4,1],[1,1,4,1,1,3],[1,1,4,3,1,1],[4,1,1,1,1,3],[4,1,1,3,1,1],[1,1,3,1,4,1],[1,1,4,1,3,1],[3,1,1,1,4,1],[4,1,1,1,3,1],[2,1,1,4,1,2],[2,1,1,2,1,4],[2,1,1,2,3,2],[2,3,3,1,1,1,2]]},SINGLE_CODE_ERROR:{value:.64},AVG_CODE_ERROR:{value:.3},FORMAT:{value:\"code_128\",writeable:!1},MODULE_INDICES:{value:{bar:[0,2,4],space:[1,3,5]}}};r.prototype=Object.create(i.a.prototype,a),r.prototype.constructor=r,r.prototype._decodeCode=function(t,e){var n,r,i,a=[0,0,0,0,0,0],u=this,c=t,s=!u._row[c],f=0,l={error:Number.MAX_VALUE,code:-1,start:t,end:t,correction:{bar:1,space:1}};for(n=c;n<u._row.length;n++)if(u._row[n]^s)a[f]++;else{if(f===a.length-1){for(e&&u._correct(a,e),r=0;r<u.CODE_PATTERN.length;r++)(i=u._matchPattern(a,u.CODE_PATTERN[r]))<l.error&&(l.code=r,l.error=i);return l.end=n,l.code===-1||l.error>u.AVG_CODE_ERROR?null:(u.CODE_PATTERN[l.code]&&(l.correction.bar=o(u.CODE_PATTERN[l.code],a,this.MODULE_INDICES.bar),l.correction.space=o(u.CODE_PATTERN[l.code],a,this.MODULE_INDICES.space)),l)}f++,a[f]=1,s=!s}return null},r.prototype._correct=function(t,e){this._correctBars(t,e.bar,this.MODULE_INDICES.bar),this._correctBars(t,e.space,this.MODULE_INDICES.space)},r.prototype._findStart=function(){var t,e,n,r,i,a=[0,0,0,0,0,0],u=this,c=u._nextSet(u._row),s=!1,f=0,l={error:Number.MAX_VALUE,code:-1,start:0,end:0,correction:{bar:1,space:1}};for(t=c;t<u._row.length;t++)if(u._row[t]^s)a[f]++;else{if(f===a.length-1){for(i=0,r=0;r<a.length;r++)i+=a[r];for(e=u.START_CODE_A;e<=u.START_CODE_C;e++)(n=u._matchPattern(a,u.CODE_PATTERN[e]))<l.error&&(l.code=e,l.error=n);if(l.error<u.AVG_CODE_ERROR)return l.start=t-i,l.end=t,l.correction.bar=o(u.CODE_PATTERN[l.code],a,this.MODULE_INDICES.bar),l.correction.space=o(u.CODE_PATTERN[l.code],a,this.MODULE_INDICES.space),l;for(r=0;r<4;r++)a[r]=a[r+2];a[4]=0,a[5]=0,f--}else f++;a[f]=1,s=!s}return null},r.prototype._decode=function(){var t,e,n=this,r=n._findStart(),o=null,i=!1,a=[],u=0,c=0,s=[],f=[],l=!1,d=!0;if(null===r)return null;switch(o={code:r.code,start:r.start,end:r.end,correction:{bar:r.correction.bar,space:r.correction.space}},f.push(o),c=o.code,o.code){case n.START_CODE_A:t=n.CODE_A;break;case n.START_CODE_B:t=n.CODE_B;break;case n.START_CODE_C:t=n.CODE_C;break;default:return null}for(;!i;){if(e=l,l=!1,null!==(o=n._decodeCode(o.end,o.correction)))switch(o.code!==n.STOP_CODE&&(d=!0),o.code!==n.STOP_CODE&&(s.push(o.code),u++,c+=u*o.code),f.push(o),t){case n.CODE_A:if(o.code<64)a.push(String.fromCharCode(32+o.code));else if(o.code<96)a.push(String.fromCharCode(o.code-64));else switch(o.code!==n.STOP_CODE&&(d=!1),o.code){case n.CODE_SHIFT:l=!0,t=n.CODE_B;break;case n.CODE_B:t=n.CODE_B;break;case n.CODE_C:t=n.CODE_C;break;case n.STOP_CODE:i=!0}break;case n.CODE_B:if(o.code<96)a.push(String.fromCharCode(32+o.code));else switch(o.code!==n.STOP_CODE&&(d=!1),o.code){case n.CODE_SHIFT:l=!0,t=n.CODE_A;break;case n.CODE_A:t=n.CODE_A;break;case n.CODE_C:t=n.CODE_C;break;case n.STOP_CODE:i=!0}break;case n.CODE_C:if(o.code<100)a.push(o.code<10?\"0\"+o.code:o.code);else switch(o.code!==n.STOP_CODE&&(d=!1),o.code){case n.CODE_A:t=n.CODE_A;break;case n.CODE_B:t=n.CODE_B;break;case n.STOP_CODE:i=!0}}else i=!0;e&&(t=t===n.CODE_A?n.CODE_B:n.CODE_A)}return null===o?null:(o.end=n._nextUnset(n._row,o.end),n._verifyTrailingWhitespace(o)?(c-=u*s[s.length-1])%103!==s[s.length-1]?null:a.length?(d&&a.splice(a.length-1,1),{code:a.join(\"\"),start:r.start,end:o.end,codeset:t,startInfo:r,decodedCodes:f,endInfo:o}):null:null)},i.a.prototype._verifyTrailingWhitespace=function(t){var e,n=this;return e=t.end+(t.end-t.start)/2,e<n._row.length&&n._matchRange(t.end,e,0)?t:null},e.a=r},function(t,e,n){\"use strict\";function r(){o.a.call(this)}var o=n(31),i={IOQ:/[IOQ]/g,AZ09:/[A-Z0-9]{17}/};r.prototype=Object.create(o.a.prototype),r.prototype.constructor=r,r.prototype._decode=function(){var t=o.a.prototype._decode.apply(this);if(!t)return null;var e=t.code;return e?(e=e.replace(i.IOQ,\"\"),e.match(i.AZ09)&&this._checkChecksum(e)?(t.code=e,t):null):null},r.prototype._checkChecksum=function(t){return!!t},e.a=r},function(t,e,n){\"use strict\";function r(){o.a.call(this)}var o=n(1),i=n(3),a=\"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ-. $/+%abcd*\",u={ALPHABETH_STRING:{value:a},ALPHABET:{value:a.split(\"\").map(function(t){return t.charCodeAt(0)})},CHARACTER_ENCODINGS:{value:[276,328,324,322,296,292,290,336,274,266,424,420,418,404,402,394,360,356,354,308,282,344,332,326,300,278,436,434,428,422,406,410,364,358,310,314,302,468,466,458,366,374,430,294,474,470,306,350]},ASTERISK:{value:350},FORMAT:{value:\"code_93\",writeable:!1}};r.prototype=Object.create(o.a.prototype,u),r.prototype.constructor=r,r.prototype._decode=function(){var t,e,n,r,o=this,a=[0,0,0,0,0,0],u=[],c=o._findStart();if(!c)return null;r=o._nextSet(o._row,c.end);do{if(a=o._toCounters(r,a),(n=o._toPattern(a))<0)return null;if((t=o._patternToChar(n))<0)return null;u.push(t),e=r,r+=i.a.sum(a),r=o._nextSet(o._row,r)}while(\"*\"!==t);return u.pop(),u.length&&o._verifyEnd(e,r,a)&&o._verifyChecksums(u)?(u=u.slice(0,u.length-2),null===(u=o._decodeExtended(u))?null:{code:u.join(\"\"),start:c.start,end:r,startInfo:c,decodedCodes:u}):null},r.prototype._verifyEnd=function(t,e){return!(t===e||!this._row[e])},r.prototype._patternToChar=function(t){var e,n=this;for(e=0;e<n.CHARACTER_ENCODINGS.length;e++)if(n.CHARACTER_ENCODINGS[e]===t)return String.fromCharCode(n.ALPHABET[e]);return-1},r.prototype._toPattern=function(t){for(var e=t.length,n=0,r=0,o=0;o<e;o++)r+=t[o];for(var i=0;i<e;i++){var a=Math.round(9*t[i]/r);if(a<1||a>4)return-1;if(0==(1&i))for(var u=0;u<a;u++)n=n<<1|1;else n<<=a}return n},r.prototype._findStart=function(){var t,e,n,r=this,o=r._nextSet(r._row),i=o,a=[0,0,0,0,0,0],u=0,c=!1;for(t=o;t<r._row.length;t++)if(r._row[t]^c)a[u]++;else{if(u===a.length-1){if(r._toPattern(a)===r.ASTERISK&&(n=Math.floor(Math.max(0,i-(t-i)/4)),r._matchRange(n,i,0)))return{start:i,end:t};for(i+=a[0]+a[1],e=0;e<4;e++)a[e]=a[e+2];a[4]=0,a[5]=0,u--}else u++;a[u]=1,c=!c}return null},r.prototype._decodeExtended=function(t){for(var e=t.length,n=[],r=0;r<e;r++){var o=t[r];if(o>=\"a\"&&o<=\"d\"){if(r>e-2)return null;var i=t[++r],a=i.charCodeAt(0),u=void 0;switch(o){case\"a\":if(!(i>=\"A\"&&i<=\"Z\"))return null;u=String.fromCharCode(a-64);break;case\"b\":if(i>=\"A\"&&i<=\"E\")u=String.fromCharCode(a-38);else if(i>=\"F\"&&i<=\"J\")u=String.fromCharCode(a-11);else if(i>=\"K\"&&i<=\"O\")u=String.fromCharCode(a+16);else if(i>=\"P\"&&i<=\"S\")u=String.fromCharCode(a+43);else{if(!(i>=\"T\"&&i<=\"Z\"))return null;u=String.fromCharCode(127)}break;case\"c\":if(i>=\"A\"&&i<=\"O\")u=String.fromCharCode(a-32);else{if(\"Z\"!==i)return 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o,i,a,u,c=[],s=this,f=0,l={error:Number.MAX_VALUE,code:-1,start:0,end:0},d=s.AVG_CODE_ERROR;for(n=n||!1,r=r||!1,e||(e=s._nextSet(s._row)),o=0;o<t.length;o++)c[o]=0;for(o=e;o<s._row.length;o++)if(s._row[o]^n)c[f]++;else{if(f===c.length-1){for(u=0,a=0;a<c.length;a++)u+=c[a];if((i=s._matchPattern(c,t))<d)return l.error=i,l.start=o-u,l.end=o,l;if(!r)return null;for(a=0;a<c.length-2;a++)c[a]=c[a+2];c[c.length-2]=0,c[c.length-1]=0,f--}else f++;c[f]=1,n=!n}return null},r.prototype._findStart=function(){for(var t,e,n=this,r=n._nextSet(n._row),o=1;!e;){if(!(e=n._findPattern(n.START_PATTERN,r,!1,!0)))return null;if(o=Math.floor((e.end-e.start)/4),(t=e.start-10*o)>=0&&n._matchRange(t,e.start,0))return e;r=e.end,e=null}},r.prototype._verifyTrailingWhitespace=function(t){var e,n=this;return e=t.end+(t.end-t.start)/2,e<n._row.length&&n._matchRange(t.end,e,0)?t:null},r.prototype._findEnd=function(){var t,e,n=this;return n._row.reverse(),t=n._findPattern(n.STOP_PATTERN),n._row.reverse(),null===t?null:(e=t.start,t.start=n._row.length-t.end,t.end=n._row.length-e,null!==t?n._verifyTrailingWhitespace(t):null)},r.prototype._decodePair=function(t){var e,n,r=[],o=this;for(e=0;e<t.length;e++){if(!(n=o._decodeCode(t[e])))return null;r.push(n)}return r},r.prototype._decodeCode=function(t){var e,n,r,o=this,i=0,a=o.AVG_CODE_ERROR,u={error:Number.MAX_VALUE,code:-1,start:0,end:0};for(e=0;e<t.length;e++)i+=t[e];for(r=0;r<o.CODE_PATTERN.length;r++)(n=o._matchPattern(t,o.CODE_PATTERN[r]))<u.error&&(u.code=r,u.error=n);if(u.error<a)return u},r.prototype._decodePayload=function(t,e,n){for(var r,o,i=this,a=0,u=t.length,c=[[0,0,0,0,0],[0,0,0,0,0]];a<u;){for(r=0;r<5;r++)c[0][r]=t[a]*this.barSpaceRatio[0],c[1][r]=t[a+1]*this.barSpaceRatio[1],a+=2;if(!(o=i._decodePair(c)))return null;for(r=0;r<o.length;r++)e.push(o[r].code+\"\"),n.push(o[r])}return o},r.prototype._verifyCounterLength=function(t){return 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blob.trim().split('\\n').map(function(line) {\n    return line.trim();\n  });\n};\n// Splits SDP into sessionpart and mediasections. Ensures CRLF.\nSDPUtils.splitSections = function(blob) {\n  var parts = blob.split('\\nm=');\n  return parts.map(function(part, index) {\n    return (index > 0 ? 'm=' + part : part).trim() + '\\r\\n';\n  });\n};\n\n// returns the session description.\nSDPUtils.getDescription = function(blob) {\n  var sections = SDPUtils.splitSections(blob);\n  return sections && sections[0];\n};\n\n// returns the individual media sections.\nSDPUtils.getMediaSections = function(blob) {\n  var sections = SDPUtils.splitSections(blob);\n  sections.shift();\n  return sections;\n};\n\n// Returns lines that start with a certain prefix.\nSDPUtils.matchPrefix = function(blob, prefix) {\n  return SDPUtils.splitLines(blob).filter(function(line) {\n    return line.indexOf(prefix) === 0;\n  });\n};\n\n// Parses an ICE candidate line. Sample input:\n// candidate:702786350 2 udp 41819902 8.8.8.8 60769 typ relay raddr 8.8.8.8\n// rport 55996\"\nSDPUtils.parseCandidate = function(line) {\n  var parts;\n  // Parse both variants.\n  if (line.indexOf('a=candidate:') === 0) {\n    parts = line.substring(12).split(' ');\n  } else {\n    parts = line.substring(10).split(' ');\n  }\n\n  var candidate = {\n    foundation: parts[0],\n    component: parseInt(parts[1], 10),\n    protocol: parts[2].toLowerCase(),\n    priority: parseInt(parts[3], 10),\n    ip: parts[4],\n    address: parts[4], // address is an alias for ip.\n    port: parseInt(parts[5], 10),\n    // skip parts[6] == 'typ'\n    type: parts[7]\n  };\n\n  for (var i = 8; i < parts.length; i += 2) {\n    switch (parts[i]) {\n      case 'raddr':\n        candidate.relatedAddress = parts[i + 1];\n        break;\n      case 'rport':\n        candidate.relatedPort = parseInt(parts[i + 1], 10);\n        break;\n      case 'tcptype':\n        candidate.tcpType = parts[i + 1];\n        break;\n      case 'ufrag':\n        candidate.ufrag = parts[i + 1]; // for backward compability.\n        candidate.usernameFragment = parts[i + 1];\n        break;\n      default: // extension handling, in particular ufrag\n        candidate[parts[i]] = parts[i + 1];\n        break;\n    }\n  }\n  return candidate;\n};\n\n// Translates a candidate object into SDP candidate attribute.\nSDPUtils.writeCandidate = function(candidate) {\n  var sdp = [];\n  sdp.push(candidate.foundation);\n  sdp.push(candidate.component);\n  sdp.push(candidate.protocol.toUpperCase());\n  sdp.push(candidate.priority);\n  sdp.push(candidate.address || candidate.ip);\n  sdp.push(candidate.port);\n\n  var type = candidate.type;\n  sdp.push('typ');\n  sdp.push(type);\n  if (type !== 'host' && candidate.relatedAddress &&\n      candidate.relatedPort) {\n    sdp.push('raddr');\n    sdp.push(candidate.relatedAddress);\n    sdp.push('rport');\n    sdp.push(candidate.relatedPort);\n  }\n  if (candidate.tcpType && candidate.protocol.toLowerCase() === 'tcp') {\n    sdp.push('tcptype');\n    sdp.push(candidate.tcpType);\n  }\n  if (candidate.usernameFragment || candidate.ufrag) {\n    sdp.push('ufrag');\n    sdp.push(candidate.usernameFragment || candidate.ufrag);\n  }\n  return 'candidate:' + sdp.join(' ');\n};\n\n// Parses an ice-options line, returns an array of option tags.\n// a=ice-options:foo bar\nSDPUtils.parseIceOptions = function(line) {\n  return line.substr(14).split(' ');\n};\n\n// Parses an rtpmap line, returns RTCRtpCoddecParameters. Sample input:\n// a=rtpmap:111 opus/48000/2\nSDPUtils.parseRtpMap = function(line) {\n  var parts = line.substr(9).split(' ');\n  var parsed = {\n    payloadType: parseInt(parts.shift(), 10) // was: id\n  };\n\n  parts = parts[0].split('/');\n\n  parsed.name = parts[0];\n  parsed.clockRate = parseInt(parts[1], 10); // was: clockrate\n  parsed.channels = parts.length === 3 ? parseInt(parts[2], 10) : 1;\n  // legacy alias, got renamed back to channels in ORTC.\n  parsed.numChannels = parsed.channels;\n  return parsed;\n};\n\n// Generate an a=rtpmap line from RTCRtpCodecCapability or\n// RTCRtpCodecParameters.\nSDPUtils.writeRtpMap = function(codec) {\n  var pt = codec.payloadType;\n  if (codec.preferredPayloadType !== undefined) {\n    pt = codec.preferredPayloadType;\n  }\n  var channels = codec.channels || codec.numChannels || 1;\n  return 'a=rtpmap:' + pt + ' ' + codec.name + '/' + codec.clockRate +\n      (channels !== 1 ? '/' + channels : '') + '\\r\\n';\n};\n\n// Parses an a=extmap line (headerextension from RFC 5285). Sample input:\n// a=extmap:2 urn:ietf:params:rtp-hdrext:toffset\n// a=extmap:2/sendonly urn:ietf:params:rtp-hdrext:toffset\nSDPUtils.parseExtmap = function(line) {\n  var parts = line.substr(9).split(' ');\n  return {\n    id: parseInt(parts[0], 10),\n    direction: parts[0].indexOf('/') > 0 ? parts[0].split('/')[1] : 'sendrecv',\n    uri: parts[1]\n  };\n};\n\n// Generates a=extmap line from RTCRtpHeaderExtensionParameters or\n// RTCRtpHeaderExtension.\nSDPUtils.writeExtmap = function(headerExtension) {\n  return 'a=extmap:' + (headerExtension.id || headerExtension.preferredId) +\n      (headerExtension.direction && headerExtension.direction !== 'sendrecv'\n          ? '/' + headerExtension.direction\n          : '') +\n      ' ' + headerExtension.uri + '\\r\\n';\n};\n\n// Parses an ftmp line, returns dictionary. Sample input:\n// a=fmtp:96 vbr=on;cng=on\n// Also deals with vbr=on; cng=on\nSDPUtils.parseFmtp = function(line) {\n  var parsed = {};\n  var kv;\n  var parts = line.substr(line.indexOf(' ') + 1).split(';');\n  for (var j = 0; j < parts.length; j++) {\n    kv = parts[j].trim().split('=');\n    parsed[kv[0].trim()] = kv[1];\n  }\n  return parsed;\n};\n\n// Generates an a=ftmp line from RTCRtpCodecCapability or RTCRtpCodecParameters.\nSDPUtils.writeFmtp = function(codec) {\n  var line = '';\n  var pt = codec.payloadType;\n  if (codec.preferredPayloadType !== undefined) {\n    pt = codec.preferredPayloadType;\n  }\n  if (codec.parameters && Object.keys(codec.parameters).length) {\n    var params = [];\n    Object.keys(codec.parameters).forEach(function(param) {\n      if (codec.parameters[param]) {\n        params.push(param + '=' + codec.parameters[param]);\n      } else {\n        params.push(param);\n      }\n    });\n    line += 'a=fmtp:' + pt + ' ' + params.join(';') + '\\r\\n';\n  }\n  return line;\n};\n\n// Parses an rtcp-fb line, returns RTCPRtcpFeedback object. Sample input:\n// a=rtcp-fb:98 nack rpsi\nSDPUtils.parseRtcpFb = function(line) {\n  var parts = line.substr(line.indexOf(' ') + 1).split(' ');\n  return {\n    type: parts.shift(),\n    parameter: parts.join(' ')\n  };\n};\n// Generate a=rtcp-fb lines from RTCRtpCodecCapability or RTCRtpCodecParameters.\nSDPUtils.writeRtcpFb = function(codec) {\n  var lines = '';\n  var pt = codec.payloadType;\n  if (codec.preferredPayloadType !== undefined) {\n    pt = codec.preferredPayloadType;\n  }\n  if (codec.rtcpFeedback && codec.rtcpFeedback.length) {\n    // FIXME: special handling for trr-int?\n    codec.rtcpFeedback.forEach(function(fb) {\n      lines += 'a=rtcp-fb:' + pt + ' ' + fb.type +\n      (fb.parameter && fb.parameter.length ? ' ' + fb.parameter : '') +\n          '\\r\\n';\n    });\n  }\n  return lines;\n};\n\n// Parses an RFC 5576 ssrc media attribute. Sample input:\n// a=ssrc:3735928559 cname:something\nSDPUtils.parseSsrcMedia = function(line) {\n  var sp = line.indexOf(' ');\n  var parts = {\n    ssrc: parseInt(line.substr(7, sp - 7), 10)\n  };\n  var colon = line.indexOf(':', sp);\n  if (colon > -1) {\n    parts.attribute = line.substr(sp + 1, colon - sp - 1);\n    parts.value = line.substr(colon + 1);\n  } else {\n    parts.attribute = line.substr(sp + 1);\n  }\n  return parts;\n};\n\nSDPUtils.parseSsrcGroup = function(line) {\n  var parts = line.substr(13).split(' ');\n  return {\n    semantics: parts.shift(),\n    ssrcs: parts.map(function(ssrc) {\n      return parseInt(ssrc, 10);\n    })\n  };\n};\n\n// Extracts the MID (RFC 5888) from a media section.\n// returns the MID or undefined if no mid line was found.\nSDPUtils.getMid = function(mediaSection) {\n  var mid = SDPUtils.matchPrefix(mediaSection, 'a=mid:')[0];\n  if (mid) {\n    return mid.substr(6);\n  }\n};\n\nSDPUtils.parseFingerprint = function(line) {\n  var parts = line.substr(14).split(' ');\n  return {\n    algorithm: parts[0].toLowerCase(), // algorithm is case-sensitive in Edge.\n    value: parts[1]\n  };\n};\n\n// Extracts DTLS parameters from SDP media section or sessionpart.\n// FIXME: for consistency with other functions this should only\n//   get the fingerprint line as input. See also getIceParameters.\nSDPUtils.getDtlsParameters = function(mediaSection, sessionpart) {\n  var lines = SDPUtils.matchPrefix(mediaSection + sessionpart,\n      'a=fingerprint:');\n  // Note: a=setup line is ignored since we use the 'auto' role.\n  // Note2: 'algorithm' is not case sensitive except in Edge.\n  return {\n    role: 'auto',\n    fingerprints: lines.map(SDPUtils.parseFingerprint)\n  };\n};\n\n// Serializes DTLS parameters to SDP.\nSDPUtils.writeDtlsParameters = function(params, setupType) {\n  var sdp = 'a=setup:' + setupType + '\\r\\n';\n  params.fingerprints.forEach(function(fp) {\n    sdp += 'a=fingerprint:' + fp.algorithm + ' ' + fp.value + '\\r\\n';\n  });\n  return sdp;\n};\n// Parses ICE information from SDP media section or sessionpart.\n// FIXME: for consistency with other functions this should only\n//   get the ice-ufrag and ice-pwd lines as input.\nSDPUtils.getIceParameters = function(mediaSection, sessionpart) {\n  var lines = SDPUtils.splitLines(mediaSection);\n  // Search in session part, too.\n  lines = lines.concat(SDPUtils.splitLines(sessionpart));\n  var iceParameters = {\n    usernameFragment: lines.filter(function(line) {\n      return line.indexOf('a=ice-ufrag:') === 0;\n    })[0].substr(12),\n    password: lines.filter(function(line) {\n      return line.indexOf('a=ice-pwd:') === 0;\n    })[0].substr(10)\n  };\n  return iceParameters;\n};\n\n// Serializes ICE parameters to SDP.\nSDPUtils.writeIceParameters = function(params) {\n  return 'a=ice-ufrag:' + params.usernameFragment + '\\r\\n' +\n      'a=ice-pwd:' + params.password + '\\r\\n';\n};\n\n// Parses the SDP media section and returns RTCRtpParameters.\nSDPUtils.parseRtpParameters = function(mediaSection) {\n  var description = {\n    codecs: [],\n    headerExtensions: [],\n    fecMechanisms: [],\n    rtcp: []\n  };\n  var lines = SDPUtils.splitLines(mediaSection);\n  var mline = lines[0].split(' ');\n  for (var i = 3; i < mline.length; i++) { // find all codecs from mline[3..]\n    var pt = mline[i];\n    var rtpmapline = SDPUtils.matchPrefix(\n        mediaSection, 'a=rtpmap:' + pt + ' ')[0];\n    if (rtpmapline) {\n      var codec = SDPUtils.parseRtpMap(rtpmapline);\n      var fmtps = SDPUtils.matchPrefix(\n          mediaSection, 'a=fmtp:' + pt + ' ');\n      // Only the first a=fmtp:<pt> is considered.\n      codec.parameters = fmtps.length ? SDPUtils.parseFmtp(fmtps[0]) : {};\n      codec.rtcpFeedback = SDPUtils.matchPrefix(\n          mediaSection, 'a=rtcp-fb:' + pt + ' ')\n        .map(SDPUtils.parseRtcpFb);\n      description.codecs.push(codec);\n      // parse FEC mechanisms from rtpmap lines.\n      switch (codec.name.toUpperCase()) {\n        case 'RED':\n        case 'ULPFEC':\n          description.fecMechanisms.push(codec.name.toUpperCase());\n          break;\n        default: // only RED and ULPFEC are recognized as FEC mechanisms.\n          break;\n      }\n    }\n  }\n  SDPUtils.matchPrefix(mediaSection, 'a=extmap:').forEach(function(line) {\n    description.headerExtensions.push(SDPUtils.parseExtmap(line));\n  });\n  // FIXME: parse rtcp.\n  return description;\n};\n\n// Generates parts of the SDP media section describing the capabilities /\n// parameters.\nSDPUtils.writeRtpDescription = function(kind, caps) {\n  var sdp = '';\n\n  // Build the mline.\n  sdp += 'm=' + kind + ' ';\n  sdp += caps.codecs.length > 0 ? '9' : '0'; // reject if no codecs.\n  sdp += ' UDP/TLS/RTP/SAVPF ';\n  sdp += caps.codecs.map(function(codec) {\n    if (codec.preferredPayloadType !== undefined) {\n      return codec.preferredPayloadType;\n    }\n    return codec.payloadType;\n  }).join(' ') + '\\r\\n';\n\n  sdp += 'c=IN IP4 0.0.0.0\\r\\n';\n  sdp += 'a=rtcp:9 IN IP4 0.0.0.0\\r\\n';\n\n  // Add a=rtpmap lines for each codec. Also fmtp and rtcp-fb.\n  caps.codecs.forEach(function(codec) {\n    sdp += SDPUtils.writeRtpMap(codec);\n    sdp += SDPUtils.writeFmtp(codec);\n    sdp += SDPUtils.writeRtcpFb(codec);\n  });\n  var maxptime = 0;\n  caps.codecs.forEach(function(codec) {\n    if (codec.maxptime > maxptime) {\n      maxptime = codec.maxptime;\n    }\n  });\n  if (maxptime > 0) {\n    sdp += 'a=maxptime:' + maxptime + '\\r\\n';\n  }\n  sdp += 'a=rtcp-mux\\r\\n';\n\n  if (caps.headerExtensions) {\n    caps.headerExtensions.forEach(function(extension) {\n      sdp += SDPUtils.writeExtmap(extension);\n    });\n  }\n  // FIXME: write fecMechanisms.\n  return sdp;\n};\n\n// Parses the SDP media section and returns an array of\n// RTCRtpEncodingParameters.\nSDPUtils.parseRtpEncodingParameters = function(mediaSection) {\n  var encodingParameters = [];\n  var description = SDPUtils.parseRtpParameters(mediaSection);\n  var hasRed = description.fecMechanisms.indexOf('RED') !== -1;\n  var hasUlpfec = description.fecMechanisms.indexOf('ULPFEC') !== -1;\n\n  // filter a=ssrc:... cname:, ignore PlanB-msid\n  var ssrcs = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:')\n  .map(function(line) {\n    return SDPUtils.parseSsrcMedia(line);\n  })\n  .filter(function(parts) {\n    return parts.attribute === 'cname';\n  });\n  var primarySsrc = ssrcs.length > 0 && ssrcs[0].ssrc;\n  var secondarySsrc;\n\n  var flows = SDPUtils.matchPrefix(mediaSection, 'a=ssrc-group:FID')\n  .map(function(line) {\n    var parts = line.substr(17).split(' ');\n    return parts.map(function(part) {\n      return parseInt(part, 10);\n    });\n  });\n  if (flows.length > 0 && flows[0].length > 1 && flows[0][0] === primarySsrc) {\n    secondarySsrc = flows[0][1];\n  }\n\n  description.codecs.forEach(function(codec) {\n    if (codec.name.toUpperCase() === 'RTX' && codec.parameters.apt) {\n      var encParam = {\n        ssrc: primarySsrc,\n        codecPayloadType: parseInt(codec.parameters.apt, 10)\n      };\n      if (primarySsrc && secondarySsrc) {\n        encParam.rtx = {ssrc: secondarySsrc};\n      }\n      encodingParameters.push(encParam);\n      if (hasRed) {\n        encParam = JSON.parse(JSON.stringify(encParam));\n        encParam.fec = {\n          ssrc: primarySsrc,\n          mechanism: hasUlpfec ? 'red+ulpfec' : 'red'\n        };\n        encodingParameters.push(encParam);\n      }\n    }\n  });\n  if (encodingParameters.length === 0 && primarySsrc) {\n    encodingParameters.push({\n      ssrc: primarySsrc\n    });\n  }\n\n  // we support both b=AS and b=TIAS but interpret AS as TIAS.\n  var bandwidth = SDPUtils.matchPrefix(mediaSection, 'b=');\n  if (bandwidth.length) {\n    if (bandwidth[0].indexOf('b=TIAS:') === 0) {\n      bandwidth = parseInt(bandwidth[0].substr(7), 10);\n    } else if (bandwidth[0].indexOf('b=AS:') === 0) {\n      // use formula from JSEP to convert b=AS to TIAS value.\n      bandwidth = parseInt(bandwidth[0].substr(5), 10) * 1000 * 0.95\n          - (50 * 40 * 8);\n    } else {\n      bandwidth = undefined;\n    }\n    encodingParameters.forEach(function(params) {\n      params.maxBitrate = bandwidth;\n    });\n  }\n  return encodingParameters;\n};\n\n// parses http://draft.ortc.org/#rtcrtcpparameters*\nSDPUtils.parseRtcpParameters = function(mediaSection) {\n  var rtcpParameters = {};\n\n  // Gets the first SSRC. Note tha with RTX there might be multiple\n  // SSRCs.\n  var remoteSsrc = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:')\n      .map(function(line) {\n        return SDPUtils.parseSsrcMedia(line);\n      })\n      .filter(function(obj) {\n        return obj.attribute === 'cname';\n      })[0];\n  if (remoteSsrc) {\n    rtcpParameters.cname = remoteSsrc.value;\n    rtcpParameters.ssrc = remoteSsrc.ssrc;\n  }\n\n  // Edge uses the compound attribute instead of reducedSize\n  // compound is !reducedSize\n  var rsize = SDPUtils.matchPrefix(mediaSection, 'a=rtcp-rsize');\n  rtcpParameters.reducedSize = rsize.length > 0;\n  rtcpParameters.compound = rsize.length === 0;\n\n  // parses the rtcp-mux attrіbute.\n  // Note that Edge does not support unmuxed RTCP.\n  var mux = SDPUtils.matchPrefix(mediaSection, 'a=rtcp-mux');\n  rtcpParameters.mux = mux.length > 0;\n\n  return rtcpParameters;\n};\n\n// parses either a=msid: or a=ssrc:... msid lines and returns\n// the id of the MediaStream and MediaStreamTrack.\nSDPUtils.parseMsid = function(mediaSection) {\n  var parts;\n  var spec = SDPUtils.matchPrefix(mediaSection, 'a=msid:');\n  if (spec.length === 1) {\n    parts = spec[0].substr(7).split(' ');\n    return {stream: parts[0], track: parts[1]};\n  }\n  var planB = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:')\n  .map(function(line) {\n    return SDPUtils.parseSsrcMedia(line);\n  })\n  .filter(function(msidParts) {\n    return msidParts.attribute === 'msid';\n  });\n  if (planB.length > 0) {\n    parts = planB[0].value.split(' ');\n    return {stream: parts[0], track: parts[1]};\n  }\n};\n\n// Generate a session ID for SDP.\n// https://tools.ietf.org/html/draft-ietf-rtcweb-jsep-20#section-5.2.1\n// recommends using a cryptographically random +ve 64-bit value\n// but right now this should be acceptable and within the right range\nSDPUtils.generateSessionId = function() {\n  return Math.random().toString().substr(2, 21);\n};\n\n// Write boilder plate for start of SDP\n// sessId argument is optional - if not supplied it will\n// be generated randomly\n// sessVersion is optional and defaults to 2\n// sessUser is optional and defaults to 'thisisadapterortc'\nSDPUtils.writeSessionBoilerplate = function(sessId, sessVer, sessUser) {\n  var sessionId;\n  var version = sessVer !== undefined ? sessVer : 2;\n  if (sessId) {\n    sessionId = sessId;\n  } else {\n    sessionId = SDPUtils.generateSessionId();\n  }\n  var user = sessUser || 'thisisadapterortc';\n  // FIXME: sess-id should be an NTP timestamp.\n  return 'v=0\\r\\n' +\n      'o=' + user + ' ' + sessionId + ' ' + version +\n        ' IN IP4 127.0.0.1\\r\\n' +\n      's=-\\r\\n' +\n      't=0 0\\r\\n';\n};\n\nSDPUtils.writeMediaSection = function(transceiver, caps, type, stream) {\n  var sdp = SDPUtils.writeRtpDescription(transceiver.kind, caps);\n\n  // Map ICE parameters (ufrag, pwd) to SDP.\n  sdp += SDPUtils.writeIceParameters(\n      transceiver.iceGatherer.getLocalParameters());\n\n  // Map DTLS parameters to SDP.\n  sdp += SDPUtils.writeDtlsParameters(\n      transceiver.dtlsTransport.getLocalParameters(),\n      type === 'offer' ? 'actpass' : 'active');\n\n  sdp += 'a=mid:' + transceiver.mid + '\\r\\n';\n\n  if (transceiver.direction) {\n    sdp += 'a=' + transceiver.direction + '\\r\\n';\n  } else if (transceiver.rtpSender && transceiver.rtpReceiver) {\n    sdp += 'a=sendrecv\\r\\n';\n  } else if (transceiver.rtpSender) {\n    sdp += 'a=sendonly\\r\\n';\n  } else if (transceiver.rtpReceiver) {\n    sdp += 'a=recvonly\\r\\n';\n  } else {\n    sdp += 'a=inactive\\r\\n';\n  }\n\n  if (transceiver.rtpSender) {\n    // spec.\n    var msid = 'msid:' + stream.id + ' ' +\n        transceiver.rtpSender.track.id + '\\r\\n';\n    sdp += 'a=' + msid;\n\n    // for Chrome.\n    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +\n        ' ' + msid;\n    if (transceiver.sendEncodingParameters[0].rtx) {\n      sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +\n          ' ' + msid;\n      sdp += 'a=ssrc-group:FID ' +\n          transceiver.sendEncodingParameters[0].ssrc + ' ' +\n          transceiver.sendEncodingParameters[0].rtx.ssrc +\n          '\\r\\n';\n    }\n  }\n  // FIXME: this should be written by writeRtpDescription.\n  sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +\n      ' cname:' + SDPUtils.localCName + '\\r\\n';\n  if (transceiver.rtpSender && transceiver.sendEncodingParameters[0].rtx) {\n    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +\n        ' cname:' + SDPUtils.localCName + '\\r\\n';\n  }\n  return sdp;\n};\n\n// Gets the direction from the mediaSection or the sessionpart.\nSDPUtils.getDirection = function(mediaSection, sessionpart) {\n  // Look for sendrecv, sendonly, recvonly, inactive, default to sendrecv.\n  var lines = SDPUtils.splitLines(mediaSection);\n  for (var i = 0; i < lines.length; i++) {\n    switch (lines[i]) {\n      case 'a=sendrecv':\n      case 'a=sendonly':\n      case 'a=recvonly':\n      case 'a=inactive':\n        return lines[i].substr(2);\n      default:\n        // FIXME: What should happen here?\n    }\n  }\n  if (sessionpart) {\n    return SDPUtils.getDirection(sessionpart);\n  }\n  return 'sendrecv';\n};\n\nSDPUtils.getKind = function(mediaSection) {\n  var lines = SDPUtils.splitLines(mediaSection);\n  var mline = lines[0].split(' ');\n  return mline[0].substr(2);\n};\n\nSDPUtils.isRejected = function(mediaSection) {\n  return mediaSection.split(' ', 2)[1] === '0';\n};\n\nSDPUtils.parseMLine = function(mediaSection) {\n  var lines = SDPUtils.splitLines(mediaSection);\n  var parts = lines[0].substr(2).split(' ');\n  return {\n    kind: parts[0],\n    port: parseInt(parts[1], 10),\n    protocol: parts[2],\n    fmt: parts.slice(3).join(' ')\n  };\n};\n\nSDPUtils.parseOLine = function(mediaSection) {\n  var line = SDPUtils.matchPrefix(mediaSection, 'o=')[0];\n  var parts = line.substr(2).split(' ');\n  return {\n    username: parts[0],\n    sessionId: parts[1],\n    sessionVersion: parseInt(parts[2], 10),\n    netType: parts[3],\n    addressType: parts[4],\n    address: parts[5]\n  };\n};\n\n// a very naive interpretation of a valid SDP.\nSDPUtils.isValidSDP = function(blob) {\n  if (typeof blob !== 'string' || blob.length === 0) {\n    return false;\n  }\n  var lines = SDPUtils.splitLines(blob);\n  for (var i = 0; i < lines.length; i++) {\n    if (lines[i].length < 2 || lines[i].charAt(1) !== '=') {\n      return false;\n    }\n    // TODO: check the modifier a bit more.\n  }\n  return true;\n};\n\n// Expose public methods.\nif (typeof module === 'object') {\n  module.exports = SDPUtils;\n}\n","// style-loader: Adds some css to the DOM by adding a <style> tag\n\n// load the styles\nvar content = require(\"!!../node_modules/css-loader/dist/cjs.js!../node_modules/vue-loader/lib/loaders/stylePostLoader.js!../node_modules/vue-loader/lib/index.js??vue-loader-options!./Scanner.vue?vue&type=style&index=0&id=4ebacf15&scoped=true&lang=css&\");\nif(typeof content === 'string') content = [[module.id, content, '']];\nif(content.locals) module.exports = content.locals;\n// add the styles to the DOM\nvar add = require(\"!../node_modules/vue-style-loader/lib/addStylesClient.js\").default\nvar update = add(\"b437ebe2\", content, false, {});\n// Hot Module Replacement\nif(module.hot) {\n // When the styles change, update the <style> tags\n if(!content.locals) {\n   module.hot.accept(\"!!../node_modules/css-loader/dist/cjs.js!../node_modules/vue-loader/lib/loaders/stylePostLoader.js!../node_modules/vue-loader/lib/index.js??vue-loader-options!./Scanner.vue?vue&type=style&index=0&id=4ebacf15&scoped=true&lang=css&\", function() {\n     var newContent = require(\"!!../node_modules/css-loader/dist/cjs.js!../node_modules/vue-loader/lib/loaders/stylePostLoader.js!../node_modules/vue-loader/lib/index.js??vue-loader-options!./Scanner.vue?vue&type=style&index=0&id=4ebacf15&scoped=true&lang=css&\");\n     if(typeof newContent === 'string') newContent = [[module.id, newContent, '']];\n     update(newContent);\n   });\n }\n // When the module is disposed, remove the <style> tags\n module.hot.dispose(function() { update(); });\n}","/*\n *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n /* eslint-env node */\n'use strict';\n\nvar SDPUtils = require('sdp');\n\nfunction fixStatsType(stat) {\n  return {\n    inboundrtp: 'inbound-rtp',\n    outboundrtp: 'outbound-rtp',\n    candidatepair: 'candidate-pair',\n    localcandidate: 'local-candidate',\n    remotecandidate: 'remote-candidate'\n  }[stat.type] || stat.type;\n}\n\nfunction writeMediaSection(transceiver, caps, type, stream, dtlsRole) {\n  var sdp = SDPUtils.writeRtpDescription(transceiver.kind, caps);\n\n  // Map ICE parameters (ufrag, pwd) to SDP.\n  sdp += SDPUtils.writeIceParameters(\n      transceiver.iceGatherer.getLocalParameters());\n\n  // Map DTLS parameters to SDP.\n  sdp += SDPUtils.writeDtlsParameters(\n      transceiver.dtlsTransport.getLocalParameters(),\n      type === 'offer' ? 'actpass' : dtlsRole || 'active');\n\n  sdp += 'a=mid:' + transceiver.mid + '\\r\\n';\n\n  if (transceiver.rtpSender && transceiver.rtpReceiver) {\n    sdp += 'a=sendrecv\\r\\n';\n  } else if (transceiver.rtpSender) {\n    sdp += 'a=sendonly\\r\\n';\n  } else if (transceiver.rtpReceiver) {\n    sdp += 'a=recvonly\\r\\n';\n  } else {\n    sdp += 'a=inactive\\r\\n';\n  }\n\n  if (transceiver.rtpSender) {\n    var trackId = transceiver.rtpSender._initialTrackId ||\n        transceiver.rtpSender.track.id;\n    transceiver.rtpSender._initialTrackId = trackId;\n    // spec.\n    var msid = 'msid:' + (stream ? stream.id : '-') + ' ' +\n        trackId + '\\r\\n';\n    sdp += 'a=' + msid;\n    // for Chrome. Legacy should no longer be required.\n    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +\n        ' ' + msid;\n\n    // RTX\n    if (transceiver.sendEncodingParameters[0].rtx) {\n      sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +\n          ' ' + msid;\n      sdp += 'a=ssrc-group:FID ' +\n          transceiver.sendEncodingParameters[0].ssrc + ' ' +\n          transceiver.sendEncodingParameters[0].rtx.ssrc +\n          '\\r\\n';\n    }\n  }\n  // FIXME: this should be written by writeRtpDescription.\n  sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +\n      ' cname:' + SDPUtils.localCName + '\\r\\n';\n  if (transceiver.rtpSender && transceiver.sendEncodingParameters[0].rtx) {\n    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +\n        ' cname:' + SDPUtils.localCName + '\\r\\n';\n  }\n  return sdp;\n}\n\n// Edge does not like\n// 1) stun: filtered after 14393 unless ?transport=udp is present\n// 2) turn: that does not have all of turn:host:port?transport=udp\n// 3) turn: with ipv6 addresses\n// 4) turn: occurring muliple times\nfunction filterIceServers(iceServers, edgeVersion) {\n  var hasTurn = false;\n  iceServers = JSON.parse(JSON.stringify(iceServers));\n  return iceServers.filter(function(server) {\n    if (server && (server.urls || server.url)) {\n      var urls = server.urls || server.url;\n      if (server.url && !server.urls) {\n        console.warn('RTCIceServer.url is deprecated! Use urls instead.');\n      }\n      var isString = typeof urls === 'string';\n      if (isString) {\n        urls = [urls];\n      }\n      urls = urls.filter(function(url) {\n        var validTurn = url.indexOf('turn:') === 0 &&\n            url.indexOf('transport=udp') !== -1 &&\n            url.indexOf('turn:[') === -1 &&\n            !hasTurn;\n\n        if (validTurn) {\n          hasTurn = true;\n          return true;\n        }\n        return url.indexOf('stun:') === 0 && edgeVersion >= 14393 &&\n            url.indexOf('?transport=udp') === -1;\n      });\n\n      delete server.url;\n      server.urls = isString ? urls[0] : urls;\n      return !!urls.length;\n    }\n  });\n}\n\n// Determines the intersection of local and remote capabilities.\nfunction getCommonCapabilities(localCapabilities, remoteCapabilities) {\n  var commonCapabilities = {\n    codecs: [],\n    headerExtensions: [],\n    fecMechanisms: []\n  };\n\n  var findCodecByPayloadType = function(pt, codecs) {\n    pt = parseInt(pt, 10);\n    for (var i = 0; i < codecs.length; i++) {\n      if (codecs[i].payloadType === pt ||\n          codecs[i].preferredPayloadType === pt) {\n        return codecs[i];\n      }\n    }\n  };\n\n  var rtxCapabilityMatches = function(lRtx, rRtx, lCodecs, rCodecs) {\n    var lCodec = findCodecByPayloadType(lRtx.parameters.apt, lCodecs);\n    var rCodec = findCodecByPayloadType(rRtx.parameters.apt, rCodecs);\n    return lCodec && rCodec &&\n        lCodec.name.toLowerCase() === rCodec.name.toLowerCase();\n  };\n\n  localCapabilities.codecs.forEach(function(lCodec) {\n    for (var i = 0; i < remoteCapabilities.codecs.length; i++) {\n      var rCodec = remoteCapabilities.codecs[i];\n      if (lCodec.name.toLowerCase() === rCodec.name.toLowerCase() &&\n          lCodec.clockRate === rCodec.clockRate) {\n        if (lCodec.name.toLowerCase() === 'rtx' &&\n            lCodec.parameters && rCodec.parameters.apt) {\n          // for RTX we need to find the local rtx that has a apt\n          // which points to the same local codec as the remote one.\n          if (!rtxCapabilityMatches(lCodec, rCodec,\n              localCapabilities.codecs, remoteCapabilities.codecs)) {\n            continue;\n          }\n        }\n        rCodec = JSON.parse(JSON.stringify(rCodec)); // deepcopy\n        // number of channels is the highest common number of channels\n        rCodec.numChannels = Math.min(lCodec.numChannels,\n            rCodec.numChannels);\n        // push rCodec so we reply with offerer payload type\n        commonCapabilities.codecs.push(rCodec);\n\n        // determine common feedback mechanisms\n        rCodec.rtcpFeedback = rCodec.rtcpFeedback.filter(function(fb) {\n          for (var j = 0; j < lCodec.rtcpFeedback.length; j++) {\n            if (lCodec.rtcpFeedback[j].type === fb.type &&\n                lCodec.rtcpFeedback[j].parameter === fb.parameter) {\n              return true;\n            }\n          }\n          return false;\n        });\n        // FIXME: also need to determine .parameters\n        //  see https://github.com/openpeer/ortc/issues/569\n        break;\n      }\n    }\n  });\n\n  localCapabilities.headerExtensions.forEach(function(lHeaderExtension) {\n    for (var i = 0; i < remoteCapabilities.headerExtensions.length;\n         i++) {\n      var rHeaderExtension = remoteCapabilities.headerExtensions[i];\n      if (lHeaderExtension.uri === rHeaderExtension.uri) {\n        commonCapabilities.headerExtensions.push(rHeaderExtension);\n        break;\n      }\n    }\n  });\n\n  // FIXME: fecMechanisms\n  return commonCapabilities;\n}\n\n// is action=setLocalDescription with type allowed in signalingState\nfunction isActionAllowedInSignalingState(action, type, signalingState) {\n  return {\n    offer: {\n      setLocalDescription: ['stable', 'have-local-offer'],\n      setRemoteDescription: ['stable', 'have-remote-offer']\n    },\n    answer: {\n      setLocalDescription: ['have-remote-offer', 'have-local-pranswer'],\n      setRemoteDescription: ['have-local-offer', 'have-remote-pranswer']\n    }\n  }[type][action].indexOf(signalingState) !== -1;\n}\n\nfunction maybeAddCandidate(iceTransport, candidate) {\n  // Edge's internal representation adds some fields therefore\n  // not all fieldѕ are taken into account.\n  var alreadyAdded = iceTransport.getRemoteCandidates()\n      .find(function(remoteCandidate) {\n        return candidate.foundation === remoteCandidate.foundation &&\n            candidate.ip === remoteCandidate.ip &&\n            candidate.port === remoteCandidate.port &&\n            candidate.priority === remoteCandidate.priority &&\n            candidate.protocol === remoteCandidate.protocol &&\n            candidate.type === remoteCandidate.type;\n      });\n  if (!alreadyAdded) {\n    iceTransport.addRemoteCandidate(candidate);\n  }\n  return !alreadyAdded;\n}\n\n\nfunction makeError(name, description) {\n  var e = new Error(description);\n  e.name = name;\n  // legacy error codes from https://heycam.github.io/webidl/#idl-DOMException-error-names\n  e.code = {\n    NotSupportedError: 9,\n    InvalidStateError: 11,\n    InvalidAccessError: 15,\n    TypeError: undefined,\n    OperationError: undefined\n  }[name];\n  return e;\n}\n\nmodule.exports = function(window, edgeVersion) {\n  // https://w3c.github.io/mediacapture-main/#mediastream\n  // Helper function to add the track to the stream and\n  // dispatch the event ourselves.\n  function addTrackToStreamAndFireEvent(track, stream) {\n    stream.addTrack(track);\n    stream.dispatchEvent(new window.MediaStreamTrackEvent('addtrack',\n        {track: track}));\n  }\n\n  function removeTrackFromStreamAndFireEvent(track, stream) {\n    stream.removeTrack(track);\n    stream.dispatchEvent(new window.MediaStreamTrackEvent('removetrack',\n        {track: track}));\n  }\n\n  function fireAddTrack(pc, track, receiver, streams) {\n    var trackEvent = new Event('track');\n    trackEvent.track = track;\n    trackEvent.receiver = receiver;\n    trackEvent.transceiver = {receiver: receiver};\n    trackEvent.streams = streams;\n    window.setTimeout(function() {\n      pc._dispatchEvent('track', trackEvent);\n    });\n  }\n\n  var RTCPeerConnection = function(config) {\n    var pc = this;\n\n    var _eventTarget = document.createDocumentFragment();\n    ['addEventListener', 'removeEventListener', 'dispatchEvent']\n        .forEach(function(method) {\n          pc[method] = _eventTarget[method].bind(_eventTarget);\n        });\n\n    this.canTrickleIceCandidates = null;\n\n    this.needNegotiation = false;\n\n    this.localStreams = [];\n    this.remoteStreams = [];\n\n    this._localDescription = null;\n    this._remoteDescription = null;\n\n    this.signalingState = 'stable';\n    this.iceConnectionState = 'new';\n    this.connectionState = 'new';\n    this.iceGatheringState = 'new';\n\n    config = JSON.parse(JSON.stringify(config || {}));\n\n    this.usingBundle = config.bundlePolicy === 'max-bundle';\n    if (config.rtcpMuxPolicy === 'negotiate') {\n      throw(makeError('NotSupportedError',\n          'rtcpMuxPolicy \\'negotiate\\' is not supported'));\n    } else if (!config.rtcpMuxPolicy) {\n      config.rtcpMuxPolicy = 'require';\n    }\n\n    switch (config.iceTransportPolicy) {\n      case 'all':\n      case 'relay':\n        break;\n      default:\n        config.iceTransportPolicy = 'all';\n        break;\n    }\n\n    switch (config.bundlePolicy) {\n      case 'balanced':\n      case 'max-compat':\n      case 'max-bundle':\n        break;\n      default:\n        config.bundlePolicy = 'balanced';\n        break;\n    }\n\n    config.iceServers = filterIceServers(config.iceServers || [], edgeVersion);\n\n    this._iceGatherers = [];\n    if (config.iceCandidatePoolSize) {\n      for (var i = config.iceCandidatePoolSize; i > 0; i--) {\n        this._iceGatherers.push(new window.RTCIceGatherer({\n          iceServers: config.iceServers,\n          gatherPolicy: config.iceTransportPolicy\n        }));\n      }\n    } else {\n      config.iceCandidatePoolSize = 0;\n    }\n\n    this._config = config;\n\n    // per-track iceGathers, iceTransports, dtlsTransports, rtpSenders, ...\n    // everything that is needed to describe a SDP m-line.\n    this.transceivers = [];\n\n    this._sdpSessionId = SDPUtils.generateSessionId();\n    this._sdpSessionVersion = 0;\n\n    this._dtlsRole = undefined; // role for a=setup to use in answers.\n\n    this._isClosed = false;\n  };\n\n  Object.defineProperty(RTCPeerConnection.prototype, 'localDescription', {\n    configurable: true,\n    get: function() {\n      return this._localDescription;\n    }\n  });\n  Object.defineProperty(RTCPeerConnection.prototype, 'remoteDescription', {\n    configurable: true,\n    get: function() {\n      return this._remoteDescription;\n    }\n  });\n\n  // set up event handlers on prototype\n  RTCPeerConnection.prototype.onicecandidate = null;\n  RTCPeerConnection.prototype.onaddstream = null;\n  RTCPeerConnection.prototype.ontrack = null;\n  RTCPeerConnection.prototype.onremovestream = null;\n  RTCPeerConnection.prototype.onsignalingstatechange = null;\n  RTCPeerConnection.prototype.oniceconnectionstatechange = null;\n  RTCPeerConnection.prototype.onconnectionstatechange = null;\n  RTCPeerConnection.prototype.onicegatheringstatechange = null;\n  RTCPeerConnection.prototype.onnegotiationneeded = null;\n  RTCPeerConnection.prototype.ondatachannel = null;\n\n  RTCPeerConnection.prototype._dispatchEvent = function(name, event) {\n    if (this._isClosed) {\n      return;\n    }\n    this.dispatchEvent(event);\n    if (typeof this['on' + name] === 'function') {\n      this['on' + name](event);\n    }\n  };\n\n  RTCPeerConnection.prototype._emitGatheringStateChange = function() {\n    var event = new Event('icegatheringstatechange');\n    this._dispatchEvent('icegatheringstatechange', event);\n  };\n\n  RTCPeerConnection.prototype.getConfiguration = function() {\n    return this._config;\n  };\n\n  RTCPeerConnection.prototype.getLocalStreams = function() {\n    return this.localStreams;\n  };\n\n  RTCPeerConnection.prototype.getRemoteStreams = function() {\n    return this.remoteStreams;\n  };\n\n  // internal helper to create a transceiver object.\n  // (which is not yet the same as the WebRTC 1.0 transceiver)\n  RTCPeerConnection.prototype._createTransceiver = function(kind, doNotAdd) {\n    var hasBundleTransport = this.transceivers.length > 0;\n    var transceiver = {\n      track: null,\n      iceGatherer: null,\n      iceTransport: null,\n      dtlsTransport: null,\n      localCapabilities: null,\n      remoteCapabilities: null,\n      rtpSender: null,\n      rtpReceiver: null,\n      kind: kind,\n      mid: null,\n      sendEncodingParameters: null,\n      recvEncodingParameters: null,\n      stream: null,\n      associatedRemoteMediaStreams: [],\n      wantReceive: true\n    };\n    if (this.usingBundle && hasBundleTransport) {\n      transceiver.iceTransport = this.transceivers[0].iceTransport;\n      transceiver.dtlsTransport = this.transceivers[0].dtlsTransport;\n    } else {\n      var transports = this._createIceAndDtlsTransports();\n      transceiver.iceTransport = transports.iceTransport;\n      transceiver.dtlsTransport = transports.dtlsTransport;\n    }\n    if (!doNotAdd) {\n      this.transceivers.push(transceiver);\n    }\n    return transceiver;\n  };\n\n  RTCPeerConnection.prototype.addTrack = function(track, stream) {\n    if (this._isClosed) {\n      throw makeError('InvalidStateError',\n          'Attempted to call addTrack on a closed peerconnection.');\n    }\n\n    var alreadyExists = this.transceivers.find(function(s) {\n      return s.track === track;\n    });\n\n    if (alreadyExists) {\n      throw makeError('InvalidAccessError', 'Track already exists.');\n    }\n\n    var transceiver;\n    for (var i = 0; i < this.transceivers.length; i++) {\n      if (!this.transceivers[i].track &&\n          this.transceivers[i].kind === track.kind) {\n        transceiver = this.transceivers[i];\n      }\n    }\n    if (!transceiver) {\n      transceiver = this._createTransceiver(track.kind);\n    }\n\n    this._maybeFireNegotiationNeeded();\n\n    if (this.localStreams.indexOf(stream) === -1) {\n      this.localStreams.push(stream);\n    }\n\n    transceiver.track = track;\n    transceiver.stream = stream;\n    transceiver.rtpSender = new window.RTCRtpSender(track,\n        transceiver.dtlsTransport);\n    return transceiver.rtpSender;\n  };\n\n  RTCPeerConnection.prototype.addStream = function(stream) {\n    var pc = this;\n    if (edgeVersion >= 15025) {\n      stream.getTracks().forEach(function(track) {\n        pc.addTrack(track, stream);\n      });\n    } else {\n      // Clone is necessary for local demos mostly, attaching directly\n      // to two different senders does not work (build 10547).\n      // Fixed in 15025 (or earlier)\n      var clonedStream = stream.clone();\n      stream.getTracks().forEach(function(track, idx) {\n        var clonedTrack = clonedStream.getTracks()[idx];\n        track.addEventListener('enabled', function(event) {\n          clonedTrack.enabled = event.enabled;\n        });\n      });\n      clonedStream.getTracks().forEach(function(track) {\n        pc.addTrack(track, clonedStream);\n      });\n    }\n  };\n\n  RTCPeerConnection.prototype.removeTrack = function(sender) {\n    if (this._isClosed) {\n      throw makeError('InvalidStateError',\n          'Attempted to call removeTrack on a closed peerconnection.');\n    }\n\n    if (!(sender instanceof window.RTCRtpSender)) {\n      throw new TypeError('Argument 1 of RTCPeerConnection.removeTrack ' +\n          'does not implement interface RTCRtpSender.');\n    }\n\n    var transceiver = this.transceivers.find(function(t) {\n      return t.rtpSender === sender;\n    });\n\n    if (!transceiver) {\n      throw makeError('InvalidAccessError',\n          'Sender was not created by this connection.');\n    }\n    var stream = transceiver.stream;\n\n    transceiver.rtpSender.stop();\n    transceiver.rtpSender = null;\n    transceiver.track = null;\n    transceiver.stream = null;\n\n    // remove the stream from the set of local streams\n    var localStreams = this.transceivers.map(function(t) {\n      return t.stream;\n    });\n    if (localStreams.indexOf(stream) === -1 &&\n        this.localStreams.indexOf(stream) > -1) {\n      this.localStreams.splice(this.localStreams.indexOf(stream), 1);\n    }\n\n    this._maybeFireNegotiationNeeded();\n  };\n\n  RTCPeerConnection.prototype.removeStream = function(stream) {\n    var pc = this;\n    stream.getTracks().forEach(function(track) {\n      var sender = pc.getSenders().find(function(s) {\n        return s.track === track;\n      });\n      if (sender) {\n        pc.removeTrack(sender);\n      }\n    });\n  };\n\n  RTCPeerConnection.prototype.getSenders = function() {\n    return this.transceivers.filter(function(transceiver) {\n      return !!transceiver.rtpSender;\n    })\n    .map(function(transceiver) {\n      return transceiver.rtpSender;\n    });\n  };\n\n  RTCPeerConnection.prototype.getReceivers = function() {\n    return this.transceivers.filter(function(transceiver) {\n      return !!transceiver.rtpReceiver;\n    })\n    .map(function(transceiver) {\n      return transceiver.rtpReceiver;\n    });\n  };\n\n\n  RTCPeerConnection.prototype._createIceGatherer = function(sdpMLineIndex,\n      usingBundle) {\n    var pc = this;\n    if (usingBundle && sdpMLineIndex > 0) {\n      return this.transceivers[0].iceGatherer;\n    } else if (this._iceGatherers.length) {\n      return this._iceGatherers.shift();\n    }\n    var iceGatherer = new window.RTCIceGatherer({\n      iceServers: this._config.iceServers,\n      gatherPolicy: this._config.iceTransportPolicy\n    });\n    Object.defineProperty(iceGatherer, 'state',\n        {value: 'new', writable: true}\n    );\n\n    this.transceivers[sdpMLineIndex].bufferedCandidateEvents = [];\n    this.transceivers[sdpMLineIndex].bufferCandidates = function(event) {\n      var end = !event.candidate || Object.keys(event.candidate).length === 0;\n      // polyfill since RTCIceGatherer.state is not implemented in\n      // Edge 10547 yet.\n      iceGatherer.state = end ? 'completed' : 'gathering';\n      if (pc.transceivers[sdpMLineIndex].bufferedCandidateEvents !== null) {\n        pc.transceivers[sdpMLineIndex].bufferedCandidateEvents.push(event);\n      }\n    };\n    iceGatherer.addEventListener('localcandidate',\n      this.transceivers[sdpMLineIndex].bufferCandidates);\n    return iceGatherer;\n  };\n\n  // start gathering from an RTCIceGatherer.\n  RTCPeerConnection.prototype._gather = function(mid, sdpMLineIndex) {\n    var pc = this;\n    var iceGatherer = this.transceivers[sdpMLineIndex].iceGatherer;\n    if (iceGatherer.onlocalcandidate) {\n      return;\n    }\n    var bufferedCandidateEvents =\n      this.transceivers[sdpMLineIndex].bufferedCandidateEvents;\n    this.transceivers[sdpMLineIndex].bufferedCandidateEvents = null;\n    iceGatherer.removeEventListener('localcandidate',\n      this.transceivers[sdpMLineIndex].bufferCandidates);\n    iceGatherer.onlocalcandidate = function(evt) {\n      if (pc.usingBundle && sdpMLineIndex > 0) {\n        // if we know that we use bundle we can drop candidates with\n        // ѕdpMLineIndex > 0. If we don't do this then our state gets\n        // confused since we dispose the extra ice gatherer.\n        return;\n      }\n      var event = new Event('icecandidate');\n      event.candidate = {sdpMid: mid, sdpMLineIndex: sdpMLineIndex};\n\n      var cand = evt.candidate;\n      // Edge emits an empty object for RTCIceCandidateComplete‥\n      var end = !cand || Object.keys(cand).length === 0;\n      if (end) {\n        // polyfill since RTCIceGatherer.state is not implemented in\n        // Edge 10547 yet.\n        if (iceGatherer.state === 'new' || iceGatherer.state === 'gathering') {\n          iceGatherer.state = 'completed';\n        }\n      } else {\n        if (iceGatherer.state === 'new') {\n          iceGatherer.state = 'gathering';\n        }\n        // RTCIceCandidate doesn't have a component, needs to be added\n        cand.component = 1;\n        // also the usernameFragment. TODO: update SDP to take both variants.\n        cand.ufrag = iceGatherer.getLocalParameters().usernameFragment;\n\n        var serializedCandidate = SDPUtils.writeCandidate(cand);\n        event.candidate = Object.assign(event.candidate,\n            SDPUtils.parseCandidate(serializedCandidate));\n\n        event.candidate.candidate = serializedCandidate;\n        event.candidate.toJSON = function() {\n          return {\n            candidate: event.candidate.candidate,\n            sdpMid: event.candidate.sdpMid,\n            sdpMLineIndex: event.candidate.sdpMLineIndex,\n            usernameFragment: event.candidate.usernameFragment\n          };\n        };\n      }\n\n      // update local description.\n      var sections = SDPUtils.getMediaSections(pc._localDescription.sdp);\n      if (!end) {\n        sections[event.candidate.sdpMLineIndex] +=\n            'a=' + event.candidate.candidate + '\\r\\n';\n      } else {\n        sections[event.candidate.sdpMLineIndex] +=\n            'a=end-of-candidates\\r\\n';\n      }\n      pc._localDescription.sdp =\n          SDPUtils.getDescription(pc._localDescription.sdp) +\n          sections.join('');\n      var complete = pc.transceivers.every(function(transceiver) {\n        return transceiver.iceGatherer &&\n            transceiver.iceGatherer.state === 'completed';\n      });\n\n      if (pc.iceGatheringState !== 'gathering') {\n        pc.iceGatheringState = 'gathering';\n        pc._emitGatheringStateChange();\n      }\n\n      // Emit candidate. Also emit null candidate when all gatherers are\n      // complete.\n      if (!end) {\n        pc._dispatchEvent('icecandidate', event);\n      }\n      if (complete) {\n        pc._dispatchEvent('icecandidate', new Event('icecandidate'));\n        pc.iceGatheringState = 'complete';\n        pc._emitGatheringStateChange();\n      }\n    };\n\n    // emit already gathered candidates.\n    window.setTimeout(function() {\n      bufferedCandidateEvents.forEach(function(e) {\n        iceGatherer.onlocalcandidate(e);\n      });\n    }, 0);\n  };\n\n  // Create ICE transport and DTLS transport.\n  RTCPeerConnection.prototype._createIceAndDtlsTransports = function() {\n    var pc = this;\n    var iceTransport = new window.RTCIceTransport(null);\n    iceTransport.onicestatechange = function() {\n      pc._updateIceConnectionState();\n      pc._updateConnectionState();\n    };\n\n    var dtlsTransport = new window.RTCDtlsTransport(iceTransport);\n    dtlsTransport.ondtlsstatechange = function() {\n      pc._updateConnectionState();\n    };\n    dtlsTransport.onerror = function() {\n      // onerror does not set state to failed by itself.\n      Object.defineProperty(dtlsTransport, 'state',\n          {value: 'failed', writable: true});\n      pc._updateConnectionState();\n    };\n\n    return {\n      iceTransport: iceTransport,\n      dtlsTransport: dtlsTransport\n    };\n  };\n\n  // Destroy ICE gatherer, ICE transport and DTLS transport.\n  // Without triggering the callbacks.\n  RTCPeerConnection.prototype._disposeIceAndDtlsTransports = function(\n      sdpMLineIndex) {\n    var iceGatherer = this.transceivers[sdpMLineIndex].iceGatherer;\n    if (iceGatherer) {\n      delete iceGatherer.onlocalcandidate;\n      delete this.transceivers[sdpMLineIndex].iceGatherer;\n    }\n    var iceTransport = this.transceivers[sdpMLineIndex].iceTransport;\n    if (iceTransport) {\n      delete iceTransport.onicestatechange;\n      delete this.transceivers[sdpMLineIndex].iceTransport;\n    }\n    var dtlsTransport = this.transceivers[sdpMLineIndex].dtlsTransport;\n    if (dtlsTransport) {\n      delete dtlsTransport.ondtlsstatechange;\n      delete dtlsTransport.onerror;\n      delete this.transceivers[sdpMLineIndex].dtlsTransport;\n    }\n  };\n\n  // Start the RTP Sender and Receiver for a transceiver.\n  RTCPeerConnection.prototype._transceive = function(transceiver,\n      send, recv) {\n    var params = getCommonCapabilities(transceiver.localCapabilities,\n        transceiver.remoteCapabilities);\n    if (send && transceiver.rtpSender) {\n      params.encodings = transceiver.sendEncodingParameters;\n      params.rtcp = {\n        cname: SDPUtils.localCName,\n        compound: transceiver.rtcpParameters.compound\n      };\n      if (transceiver.recvEncodingParameters.length) {\n        params.rtcp.ssrc = transceiver.recvEncodingParameters[0].ssrc;\n      }\n      transceiver.rtpSender.send(params);\n    }\n    if (recv && transceiver.rtpReceiver && params.codecs.length > 0) {\n      // remove RTX field in Edge 14942\n      if (transceiver.kind === 'video'\n          && transceiver.recvEncodingParameters\n          && edgeVersion < 15019) {\n        transceiver.recvEncodingParameters.forEach(function(p) {\n          delete p.rtx;\n        });\n      }\n      if (transceiver.recvEncodingParameters.length) {\n        params.encodings = transceiver.recvEncodingParameters;\n      } else {\n        params.encodings = [{}];\n      }\n      params.rtcp = {\n        compound: transceiver.rtcpParameters.compound\n      };\n      if (transceiver.rtcpParameters.cname) {\n        params.rtcp.cname = transceiver.rtcpParameters.cname;\n      }\n      if (transceiver.sendEncodingParameters.length) {\n        params.rtcp.ssrc = transceiver.sendEncodingParameters[0].ssrc;\n      }\n      transceiver.rtpReceiver.receive(params);\n    }\n  };\n\n  RTCPeerConnection.prototype.setLocalDescription = function(description) {\n    var pc = this;\n\n    // Note: pranswer is not supported.\n    if (['offer', 'answer'].indexOf(description.type) === -1) {\n      return Promise.reject(makeError('TypeError',\n          'Unsupported type \"' + description.type + '\"'));\n    }\n\n    if (!isActionAllowedInSignalingState('setLocalDescription',\n        description.type, pc.signalingState) || pc._isClosed) {\n      return Promise.reject(makeError('InvalidStateError',\n          'Can not set local ' + description.type +\n          ' in state ' + pc.signalingState));\n    }\n\n    var sections;\n    var sessionpart;\n    if (description.type === 'offer') {\n      // VERY limited support for SDP munging. Limited to:\n      // * changing the order of codecs\n      sections = SDPUtils.splitSections(description.sdp);\n      sessionpart = sections.shift();\n      sections.forEach(function(mediaSection, sdpMLineIndex) {\n        var caps = SDPUtils.parseRtpParameters(mediaSection);\n        pc.transceivers[sdpMLineIndex].localCapabilities = caps;\n      });\n\n      pc.transceivers.forEach(function(transceiver, sdpMLineIndex) {\n        pc._gather(transceiver.mid, sdpMLineIndex);\n      });\n    } else if (description.type === 'answer') {\n      sections = SDPUtils.splitSections(pc._remoteDescription.sdp);\n      sessionpart = sections.shift();\n      var isIceLite = SDPUtils.matchPrefix(sessionpart,\n          'a=ice-lite').length > 0;\n      sections.forEach(function(mediaSection, sdpMLineIndex) {\n        var transceiver = pc.transceivers[sdpMLineIndex];\n        var iceGatherer = transceiver.iceGatherer;\n        var iceTransport = transceiver.iceTransport;\n        var dtlsTransport = transceiver.dtlsTransport;\n        var localCapabilities = transceiver.localCapabilities;\n        var remoteCapabilities = transceiver.remoteCapabilities;\n\n        // treat bundle-only as not-rejected.\n        var rejected = SDPUtils.isRejected(mediaSection) &&\n            SDPUtils.matchPrefix(mediaSection, 'a=bundle-only').length === 0;\n\n        if (!rejected && !transceiver.rejected) {\n          var remoteIceParameters = SDPUtils.getIceParameters(\n              mediaSection, sessionpart);\n          var remoteDtlsParameters = SDPUtils.getDtlsParameters(\n              mediaSection, sessionpart);\n          if (isIceLite) {\n            remoteDtlsParameters.role = 'server';\n          }\n\n          if (!pc.usingBundle || sdpMLineIndex === 0) {\n            pc._gather(transceiver.mid, sdpMLineIndex);\n            if (iceTransport.state === 'new') {\n              iceTransport.start(iceGatherer, remoteIceParameters,\n                  isIceLite ? 'controlling' : 'controlled');\n            }\n            if (dtlsTransport.state === 'new') {\n              dtlsTransport.start(remoteDtlsParameters);\n            }\n          }\n\n          // Calculate intersection of capabilities.\n          var params = getCommonCapabilities(localCapabilities,\n              remoteCapabilities);\n\n          // Start the RTCRtpSender. The RTCRtpReceiver for this\n          // transceiver has already been started in setRemoteDescription.\n          pc._transceive(transceiver,\n              params.codecs.length > 0,\n              false);\n        }\n      });\n    }\n\n    pc._localDescription = {\n      type: description.type,\n      sdp: description.sdp\n    };\n    if (description.type === 'offer') {\n      pc._updateSignalingState('have-local-offer');\n    } else {\n      pc._updateSignalingState('stable');\n    }\n\n    return Promise.resolve();\n  };\n\n  RTCPeerConnection.prototype.setRemoteDescription = function(description) {\n    var pc = this;\n\n    // Note: pranswer is not supported.\n    if (['offer', 'answer'].indexOf(description.type) === -1) {\n      return Promise.reject(makeError('TypeError',\n          'Unsupported type \"' + description.type + '\"'));\n    }\n\n    if (!isActionAllowedInSignalingState('setRemoteDescription',\n        description.type, pc.signalingState) || pc._isClosed) {\n      return Promise.reject(makeError('InvalidStateError',\n          'Can not set remote ' + description.type +\n          ' in state ' + pc.signalingState));\n    }\n\n    var streams = {};\n    pc.remoteStreams.forEach(function(stream) {\n      streams[stream.id] = stream;\n    });\n    var receiverList = [];\n    var sections = SDPUtils.splitSections(description.sdp);\n    var sessionpart = sections.shift();\n    var isIceLite = SDPUtils.matchPrefix(sessionpart,\n        'a=ice-lite').length > 0;\n    var usingBundle = SDPUtils.matchPrefix(sessionpart,\n        'a=group:BUNDLE ').length > 0;\n    pc.usingBundle = usingBundle;\n    var iceOptions = SDPUtils.matchPrefix(sessionpart,\n        'a=ice-options:')[0];\n    if (iceOptions) {\n      pc.canTrickleIceCandidates = iceOptions.substr(14).split(' ')\n          .indexOf('trickle') >= 0;\n    } else {\n      pc.canTrickleIceCandidates = false;\n    }\n\n    sections.forEach(function(mediaSection, sdpMLineIndex) {\n      var lines = SDPUtils.splitLines(mediaSection);\n      var kind = SDPUtils.getKind(mediaSection);\n      // treat bundle-only as not-rejected.\n      var rejected = SDPUtils.isRejected(mediaSection) &&\n          SDPUtils.matchPrefix(mediaSection, 'a=bundle-only').length === 0;\n      var protocol = lines[0].substr(2).split(' ')[2];\n\n      var direction = SDPUtils.getDirection(mediaSection, sessionpart);\n      var remoteMsid = SDPUtils.parseMsid(mediaSection);\n\n      var mid = SDPUtils.getMid(mediaSection) || SDPUtils.generateIdentifier();\n\n      // Reject datachannels which are not implemented yet.\n      if (rejected || (kind === 'application' && (protocol === 'DTLS/SCTP' ||\n          protocol === 'UDP/DTLS/SCTP'))) {\n        // TODO: this is dangerous in the case where a non-rejected m-line\n        //     becomes rejected.\n        pc.transceivers[sdpMLineIndex] = {\n          mid: mid,\n          kind: kind,\n          protocol: protocol,\n          rejected: true\n        };\n        return;\n      }\n\n      if (!rejected && pc.transceivers[sdpMLineIndex] &&\n          pc.transceivers[sdpMLineIndex].rejected) {\n        // recycle a rejected transceiver.\n        pc.transceivers[sdpMLineIndex] = pc._createTransceiver(kind, true);\n      }\n\n      var transceiver;\n      var iceGatherer;\n      var iceTransport;\n      var dtlsTransport;\n      var rtpReceiver;\n      var sendEncodingParameters;\n      var recvEncodingParameters;\n      var localCapabilities;\n\n      var track;\n      // FIXME: ensure the mediaSection has rtcp-mux set.\n      var remoteCapabilities = SDPUtils.parseRtpParameters(mediaSection);\n      var remoteIceParameters;\n      var remoteDtlsParameters;\n      if (!rejected) {\n        remoteIceParameters = SDPUtils.getIceParameters(mediaSection,\n            sessionpart);\n        remoteDtlsParameters = SDPUtils.getDtlsParameters(mediaSection,\n            sessionpart);\n        remoteDtlsParameters.role = 'client';\n      }\n      recvEncodingParameters =\n          SDPUtils.parseRtpEncodingParameters(mediaSection);\n\n      var rtcpParameters = SDPUtils.parseRtcpParameters(mediaSection);\n\n      var isComplete = SDPUtils.matchPrefix(mediaSection,\n          'a=end-of-candidates', sessionpart).length > 0;\n      var cands = SDPUtils.matchPrefix(mediaSection, 'a=candidate:')\n          .map(function(cand) {\n            return SDPUtils.parseCandidate(cand);\n          })\n          .filter(function(cand) {\n            return cand.component === 1;\n          });\n\n      // Check if we can use BUNDLE and dispose transports.\n      if ((description.type === 'offer' || description.type === 'answer') &&\n          !rejected && usingBundle && sdpMLineIndex > 0 &&\n          pc.transceivers[sdpMLineIndex]) {\n        pc._disposeIceAndDtlsTransports(sdpMLineIndex);\n        pc.transceivers[sdpMLineIndex].iceGatherer =\n            pc.transceivers[0].iceGatherer;\n        pc.transceivers[sdpMLineIndex].iceTransport =\n            pc.transceivers[0].iceTransport;\n        pc.transceivers[sdpMLineIndex].dtlsTransport =\n            pc.transceivers[0].dtlsTransport;\n        if (pc.transceivers[sdpMLineIndex].rtpSender) {\n          pc.transceivers[sdpMLineIndex].rtpSender.setTransport(\n              pc.transceivers[0].dtlsTransport);\n        }\n        if (pc.transceivers[sdpMLineIndex].rtpReceiver) {\n          pc.transceivers[sdpMLineIndex].rtpReceiver.setTransport(\n              pc.transceivers[0].dtlsTransport);\n        }\n      }\n      if (description.type === 'offer' && !rejected) {\n        transceiver = pc.transceivers[sdpMLineIndex] ||\n            pc._createTransceiver(kind);\n        transceiver.mid = mid;\n\n        if (!transceiver.iceGatherer) {\n          transceiver.iceGatherer = pc._createIceGatherer(sdpMLineIndex,\n              usingBundle);\n        }\n\n        if (cands.length && transceiver.iceTransport.state === 'new') {\n          if (isComplete && (!usingBundle || sdpMLineIndex === 0)) {\n            transceiver.iceTransport.setRemoteCandidates(cands);\n          } else {\n            cands.forEach(function(candidate) {\n              maybeAddCandidate(transceiver.iceTransport, candidate);\n            });\n          }\n        }\n\n        localCapabilities = window.RTCRtpReceiver.getCapabilities(kind);\n\n        // filter RTX until additional stuff needed for RTX is implemented\n        // in adapter.js\n        if (edgeVersion < 15019) {\n          localCapabilities.codecs = localCapabilities.codecs.filter(\n              function(codec) {\n                return codec.name !== 'rtx';\n              });\n        }\n\n        sendEncodingParameters = transceiver.sendEncodingParameters || [{\n          ssrc: (2 * sdpMLineIndex + 2) * 1001\n        }];\n\n        // TODO: rewrite to use http://w3c.github.io/webrtc-pc/#set-associated-remote-streams\n        var isNewTrack = false;\n        if (direction === 'sendrecv' || direction === 'sendonly') {\n          isNewTrack = !transceiver.rtpReceiver;\n          rtpReceiver = transceiver.rtpReceiver ||\n              new window.RTCRtpReceiver(transceiver.dtlsTransport, kind);\n\n          if (isNewTrack) {\n            var stream;\n            track = rtpReceiver.track;\n            // FIXME: does not work with Plan B.\n            if (remoteMsid && remoteMsid.stream === '-') {\n              // no-op. a stream id of '-' means: no associated stream.\n            } else if (remoteMsid) {\n              if (!streams[remoteMsid.stream]) {\n                streams[remoteMsid.stream] = new window.MediaStream();\n                Object.defineProperty(streams[remoteMsid.stream], 'id', {\n                  get: function() {\n                    return remoteMsid.stream;\n                  }\n                });\n              }\n              Object.defineProperty(track, 'id', {\n                get: function() {\n                  return remoteMsid.track;\n                }\n              });\n              stream = streams[remoteMsid.stream];\n            } else {\n              if (!streams.default) {\n                streams.default = new window.MediaStream();\n              }\n              stream = streams.default;\n            }\n            if (stream) {\n              addTrackToStreamAndFireEvent(track, stream);\n              transceiver.associatedRemoteMediaStreams.push(stream);\n            }\n            receiverList.push([track, rtpReceiver, stream]);\n          }\n        } else if (transceiver.rtpReceiver && transceiver.rtpReceiver.track) {\n          transceiver.associatedRemoteMediaStreams.forEach(function(s) {\n            var nativeTrack = s.getTracks().find(function(t) {\n              return t.id === transceiver.rtpReceiver.track.id;\n            });\n            if (nativeTrack) {\n              removeTrackFromStreamAndFireEvent(nativeTrack, s);\n            }\n          });\n          transceiver.associatedRemoteMediaStreams = [];\n        }\n\n        transceiver.localCapabilities = localCapabilities;\n        transceiver.remoteCapabilities = remoteCapabilities;\n        transceiver.rtpReceiver = rtpReceiver;\n        transceiver.rtcpParameters = rtcpParameters;\n        transceiver.sendEncodingParameters = sendEncodingParameters;\n        transceiver.recvEncodingParameters = recvEncodingParameters;\n\n        // Start the RTCRtpReceiver now. The RTPSender is started in\n        // setLocalDescription.\n        pc._transceive(pc.transceivers[sdpMLineIndex],\n            false,\n            isNewTrack);\n      } else if (description.type === 'answer' && !rejected) {\n        transceiver = pc.transceivers[sdpMLineIndex];\n        iceGatherer = transceiver.iceGatherer;\n        iceTransport = transceiver.iceTransport;\n        dtlsTransport = transceiver.dtlsTransport;\n        rtpReceiver = transceiver.rtpReceiver;\n        sendEncodingParameters = transceiver.sendEncodingParameters;\n        localCapabilities = transceiver.localCapabilities;\n\n        pc.transceivers[sdpMLineIndex].recvEncodingParameters =\n            recvEncodingParameters;\n        pc.transceivers[sdpMLineIndex].remoteCapabilities =\n            remoteCapabilities;\n        pc.transceivers[sdpMLineIndex].rtcpParameters = rtcpParameters;\n\n        if (cands.length && iceTransport.state === 'new') {\n          if ((isIceLite || isComplete) &&\n              (!usingBundle || sdpMLineIndex === 0)) {\n            iceTransport.setRemoteCandidates(cands);\n          } else {\n            cands.forEach(function(candidate) {\n              maybeAddCandidate(transceiver.iceTransport, candidate);\n            });\n          }\n        }\n\n        if (!usingBundle || sdpMLineIndex === 0) {\n          if (iceTransport.state === 'new') {\n            iceTransport.start(iceGatherer, remoteIceParameters,\n                'controlling');\n          }\n          if (dtlsTransport.state === 'new') {\n            dtlsTransport.start(remoteDtlsParameters);\n          }\n        }\n\n        // If the offer contained RTX but the answer did not,\n        // remove RTX from sendEncodingParameters.\n        var commonCapabilities = getCommonCapabilities(\n          transceiver.localCapabilities,\n          transceiver.remoteCapabilities);\n\n        var hasRtx = commonCapabilities.codecs.filter(function(c) {\n          return c.name.toLowerCase() === 'rtx';\n        }).length;\n        if (!hasRtx && transceiver.sendEncodingParameters[0].rtx) {\n          delete transceiver.sendEncodingParameters[0].rtx;\n        }\n\n        pc._transceive(transceiver,\n            direction === 'sendrecv' || direction === 'recvonly',\n            direction === 'sendrecv' || direction === 'sendonly');\n\n        // TODO: rewrite to use http://w3c.github.io/webrtc-pc/#set-associated-remote-streams\n        if (rtpReceiver &&\n            (direction === 'sendrecv' || direction === 'sendonly')) {\n          track = rtpReceiver.track;\n          if (remoteMsid) {\n            if (!streams[remoteMsid.stream]) {\n              streams[remoteMsid.stream] = new window.MediaStream();\n            }\n            addTrackToStreamAndFireEvent(track, streams[remoteMsid.stream]);\n            receiverList.push([track, rtpReceiver, streams[remoteMsid.stream]]);\n          } else {\n            if (!streams.default) {\n              streams.default = new window.MediaStream();\n            }\n            addTrackToStreamAndFireEvent(track, streams.default);\n            receiverList.push([track, rtpReceiver, streams.default]);\n          }\n        } else {\n          // FIXME: actually the receiver should be created later.\n          delete transceiver.rtpReceiver;\n        }\n      }\n    });\n\n    if (pc._dtlsRole === undefined) {\n      pc._dtlsRole = description.type === 'offer' ? 'active' : 'passive';\n    }\n\n    pc._remoteDescription = {\n      type: description.type,\n      sdp: description.sdp\n    };\n    if (description.type === 'offer') {\n      pc._updateSignalingState('have-remote-offer');\n    } else {\n      pc._updateSignalingState('stable');\n    }\n    Object.keys(streams).forEach(function(sid) {\n      var stream = streams[sid];\n      if (stream.getTracks().length) {\n        if (pc.remoteStreams.indexOf(stream) === -1) {\n          pc.remoteStreams.push(stream);\n          var event = new Event('addstream');\n          event.stream = stream;\n          window.setTimeout(function() {\n            pc._dispatchEvent('addstream', event);\n          });\n        }\n\n        receiverList.forEach(function(item) {\n          var track = item[0];\n          var receiver = item[1];\n          if (stream.id !== item[2].id) {\n            return;\n          }\n          fireAddTrack(pc, track, receiver, [stream]);\n        });\n      }\n    });\n    receiverList.forEach(function(item) {\n      if (item[2]) {\n        return;\n      }\n      fireAddTrack(pc, item[0], item[1], []);\n    });\n\n    // check whether addIceCandidate({}) was called within four seconds after\n    // setRemoteDescription.\n    window.setTimeout(function() {\n      if (!(pc && pc.transceivers)) {\n        return;\n      }\n      pc.transceivers.forEach(function(transceiver) {\n        if (transceiver.iceTransport &&\n            transceiver.iceTransport.state === 'new' &&\n            transceiver.iceTransport.getRemoteCandidates().length > 0) {\n          console.warn('Timeout for addRemoteCandidate. Consider sending ' +\n              'an end-of-candidates notification');\n          transceiver.iceTransport.addRemoteCandidate({});\n        }\n      });\n    }, 4000);\n\n    return Promise.resolve();\n  };\n\n  RTCPeerConnection.prototype.close = function() {\n    this.transceivers.forEach(function(transceiver) {\n      /* not yet\n      if (transceiver.iceGatherer) {\n        transceiver.iceGatherer.close();\n      }\n      */\n      if (transceiver.iceTransport) {\n        transceiver.iceTransport.stop();\n      }\n      if (transceiver.dtlsTransport) {\n        transceiver.dtlsTransport.stop();\n      }\n      if (transceiver.rtpSender) {\n        transceiver.rtpSender.stop();\n      }\n      if (transceiver.rtpReceiver) {\n        transceiver.rtpReceiver.stop();\n      }\n    });\n    // FIXME: clean up tracks, local streams, remote streams, etc\n    this._isClosed = true;\n    this._updateSignalingState('closed');\n  };\n\n  // Update the signaling state.\n  RTCPeerConnection.prototype._updateSignalingState = function(newState) {\n    this.signalingState = newState;\n    var event = new Event('signalingstatechange');\n    this._dispatchEvent('signalingstatechange', event);\n  };\n\n  // Determine whether to fire the negotiationneeded event.\n  RTCPeerConnection.prototype._maybeFireNegotiationNeeded = function() {\n    var pc = this;\n    if (this.signalingState !== 'stable' || this.needNegotiation === true) {\n      return;\n    }\n    this.needNegotiation = true;\n    window.setTimeout(function() {\n      if (pc.needNegotiation) {\n        pc.needNegotiation = false;\n        var event = new Event('negotiationneeded');\n        pc._dispatchEvent('negotiationneeded', event);\n      }\n    }, 0);\n  };\n\n  // Update the ice connection state.\n  RTCPeerConnection.prototype._updateIceConnectionState = function() {\n    var newState;\n    var states = {\n      'new': 0,\n      closed: 0,\n      checking: 0,\n      connected: 0,\n      completed: 0,\n      disconnected: 0,\n      failed: 0\n    };\n    this.transceivers.forEach(function(transceiver) {\n      if (transceiver.iceTransport && !transceiver.rejected) {\n        states[transceiver.iceTransport.state]++;\n      }\n    });\n\n    newState = 'new';\n    if (states.failed > 0) {\n      newState = 'failed';\n    } else if (states.checking > 0) {\n      newState = 'checking';\n    } else if (states.disconnected > 0) {\n      newState = 'disconnected';\n    } else if (states.new > 0) {\n      newState = 'new';\n    } else if (states.connected > 0) {\n      newState = 'connected';\n    } else if (states.completed > 0) {\n      newState = 'completed';\n    }\n\n    if (newState !== this.iceConnectionState) {\n      this.iceConnectionState = newState;\n      var event = new Event('iceconnectionstatechange');\n      this._dispatchEvent('iceconnectionstatechange', event);\n    }\n  };\n\n  // Update the connection state.\n  RTCPeerConnection.prototype._updateConnectionState = function() {\n    var newState;\n    var states = {\n      'new': 0,\n      closed: 0,\n      connecting: 0,\n      connected: 0,\n      completed: 0,\n      disconnected: 0,\n      failed: 0\n    };\n    this.transceivers.forEach(function(transceiver) {\n      if (transceiver.iceTransport && transceiver.dtlsTransport &&\n          !transceiver.rejected) {\n        states[transceiver.iceTransport.state]++;\n        states[transceiver.dtlsTransport.state]++;\n      }\n    });\n    // ICETransport.completed and connected are the same for this purpose.\n    states.connected += states.completed;\n\n    newState = 'new';\n    if (states.failed > 0) {\n      newState = 'failed';\n    } else if (states.connecting > 0) {\n      newState = 'connecting';\n    } else if (states.disconnected > 0) {\n      newState = 'disconnected';\n    } else if (states.new > 0) {\n      newState = 'new';\n    } else if (states.connected > 0) {\n      newState = 'connected';\n    }\n\n    if (newState !== this.connectionState) {\n      this.connectionState = newState;\n      var event = new Event('connectionstatechange');\n      this._dispatchEvent('connectionstatechange', event);\n    }\n  };\n\n  RTCPeerConnection.prototype.createOffer = function() {\n    var pc = this;\n\n    if (pc._isClosed) {\n      return Promise.reject(makeError('InvalidStateError',\n          'Can not call createOffer after close'));\n    }\n\n    var numAudioTracks = pc.transceivers.filter(function(t) {\n      return t.kind === 'audio';\n    }).length;\n    var numVideoTracks = pc.transceivers.filter(function(t) {\n      return t.kind === 'video';\n    }).length;\n\n    // Determine number of audio and video tracks we need to send/recv.\n    var offerOptions = arguments[0];\n    if (offerOptions) {\n      // Reject Chrome legacy constraints.\n      if (offerOptions.mandatory || offerOptions.optional) {\n        throw new TypeError(\n            'Legacy mandatory/optional constraints not supported.');\n      }\n      if (offerOptions.offerToReceiveAudio !== undefined) {\n        if (offerOptions.offerToReceiveAudio === true) {\n          numAudioTracks = 1;\n        } else if (offerOptions.offerToReceiveAudio === false) {\n          numAudioTracks = 0;\n        } else {\n          numAudioTracks = offerOptions.offerToReceiveAudio;\n        }\n      }\n      if (offerOptions.offerToReceiveVideo !== undefined) {\n        if (offerOptions.offerToReceiveVideo === true) {\n          numVideoTracks = 1;\n        } else if (offerOptions.offerToReceiveVideo === false) {\n          numVideoTracks = 0;\n        } else {\n          numVideoTracks = offerOptions.offerToReceiveVideo;\n        }\n      }\n    }\n\n    pc.transceivers.forEach(function(transceiver) {\n      if (transceiver.kind === 'audio') {\n        numAudioTracks--;\n        if (numAudioTracks < 0) {\n          transceiver.wantReceive = false;\n        }\n      } else if (transceiver.kind === 'video') {\n        numVideoTracks--;\n        if (numVideoTracks < 0) {\n          transceiver.wantReceive = false;\n        }\n      }\n    });\n\n    // Create M-lines for recvonly streams.\n    while (numAudioTracks > 0 || numVideoTracks > 0) {\n      if (numAudioTracks > 0) {\n        pc._createTransceiver('audio');\n        numAudioTracks--;\n      }\n      if (numVideoTracks > 0) {\n        pc._createTransceiver('video');\n        numVideoTracks--;\n      }\n    }\n\n    var sdp = SDPUtils.writeSessionBoilerplate(pc._sdpSessionId,\n        pc._sdpSessionVersion++);\n    pc.transceivers.forEach(function(transceiver, sdpMLineIndex) {\n      // For each track, create an ice gatherer, ice transport,\n      // dtls transport, potentially rtpsender and rtpreceiver.\n      var track = transceiver.track;\n      var kind = transceiver.kind;\n      var mid = transceiver.mid || SDPUtils.generateIdentifier();\n      transceiver.mid = mid;\n\n      if (!transceiver.iceGatherer) {\n        transceiver.iceGatherer = pc._createIceGatherer(sdpMLineIndex,\n            pc.usingBundle);\n      }\n\n      var localCapabilities = window.RTCRtpSender.getCapabilities(kind);\n      // filter RTX until additional stuff needed for RTX is implemented\n      // in adapter.js\n      if (edgeVersion < 15019) {\n        localCapabilities.codecs = localCapabilities.codecs.filter(\n            function(codec) {\n              return codec.name !== 'rtx';\n            });\n      }\n      localCapabilities.codecs.forEach(function(codec) {\n        // work around https://bugs.chromium.org/p/webrtc/issues/detail?id=6552\n        // by adding level-asymmetry-allowed=1\n        if (codec.name === 'H264' &&\n            codec.parameters['level-asymmetry-allowed'] === undefined) {\n          codec.parameters['level-asymmetry-allowed'] = '1';\n        }\n\n        // for subsequent offers, we might have to re-use the payload\n        // type of the last offer.\n        if (transceiver.remoteCapabilities &&\n            transceiver.remoteCapabilities.codecs) {\n          transceiver.remoteCapabilities.codecs.forEach(function(remoteCodec) {\n            if (codec.name.toLowerCase() === remoteCodec.name.toLowerCase() &&\n                codec.clockRate === remoteCodec.clockRate) {\n              codec.preferredPayloadType = remoteCodec.payloadType;\n            }\n          });\n        }\n      });\n      localCapabilities.headerExtensions.forEach(function(hdrExt) {\n        var remoteExtensions = transceiver.remoteCapabilities &&\n            transceiver.remoteCapabilities.headerExtensions || [];\n        remoteExtensions.forEach(function(rHdrExt) {\n          if (hdrExt.uri === rHdrExt.uri) {\n            hdrExt.id = rHdrExt.id;\n          }\n        });\n      });\n\n      // generate an ssrc now, to be used later in rtpSender.send\n      var sendEncodingParameters = transceiver.sendEncodingParameters || [{\n        ssrc: (2 * sdpMLineIndex + 1) * 1001\n      }];\n      if (track) {\n        // add RTX\n        if (edgeVersion >= 15019 && kind === 'video' &&\n            !sendEncodingParameters[0].rtx) {\n          sendEncodingParameters[0].rtx = {\n            ssrc: sendEncodingParameters[0].ssrc + 1\n          };\n        }\n      }\n\n      if (transceiver.wantReceive) {\n        transceiver.rtpReceiver = new window.RTCRtpReceiver(\n            transceiver.dtlsTransport, kind);\n      }\n\n      transceiver.localCapabilities = localCapabilities;\n      transceiver.sendEncodingParameters = sendEncodingParameters;\n    });\n\n    // always offer BUNDLE and dispose on return if not supported.\n    if (pc._config.bundlePolicy !== 'max-compat') {\n      sdp += 'a=group:BUNDLE ' + pc.transceivers.map(function(t) {\n        return t.mid;\n      }).join(' ') + '\\r\\n';\n    }\n    sdp += 'a=ice-options:trickle\\r\\n';\n\n    pc.transceivers.forEach(function(transceiver, sdpMLineIndex) {\n      sdp += writeMediaSection(transceiver, transceiver.localCapabilities,\n          'offer', transceiver.stream, pc._dtlsRole);\n      sdp += 'a=rtcp-rsize\\r\\n';\n\n      if (transceiver.iceGatherer && pc.iceGatheringState !== 'new' &&\n          (sdpMLineIndex === 0 || !pc.usingBundle)) {\n        transceiver.iceGatherer.getLocalCandidates().forEach(function(cand) {\n          cand.component = 1;\n          sdp += 'a=' + SDPUtils.writeCandidate(cand) + '\\r\\n';\n        });\n\n        if (transceiver.iceGatherer.state === 'completed') {\n          sdp += 'a=end-of-candidates\\r\\n';\n        }\n      }\n    });\n\n    var desc = new window.RTCSessionDescription({\n      type: 'offer',\n      sdp: sdp\n    });\n    return Promise.resolve(desc);\n  };\n\n  RTCPeerConnection.prototype.createAnswer = function() {\n    var pc = this;\n\n    if (pc._isClosed) {\n      return Promise.reject(makeError('InvalidStateError',\n          'Can not call createAnswer after close'));\n    }\n\n    if (!(pc.signalingState === 'have-remote-offer' ||\n        pc.signalingState === 'have-local-pranswer')) {\n      return Promise.reject(makeError('InvalidStateError',\n          'Can not call createAnswer in signalingState ' + pc.signalingState));\n    }\n\n    var sdp = SDPUtils.writeSessionBoilerplate(pc._sdpSessionId,\n        pc._sdpSessionVersion++);\n    if (pc.usingBundle) {\n      sdp += 'a=group:BUNDLE ' + pc.transceivers.map(function(t) {\n        return t.mid;\n      }).join(' ') + '\\r\\n';\n    }\n    sdp += 'a=ice-options:trickle\\r\\n';\n\n    var mediaSectionsInOffer = SDPUtils.getMediaSections(\n        pc._remoteDescription.sdp).length;\n    pc.transceivers.forEach(function(transceiver, sdpMLineIndex) {\n      if (sdpMLineIndex + 1 > mediaSectionsInOffer) {\n        return;\n      }\n      if (transceiver.rejected) {\n        if (transceiver.kind === 'application') {\n          if (transceiver.protocol === 'DTLS/SCTP') { // legacy fmt\n            sdp += 'm=application 0 DTLS/SCTP 5000\\r\\n';\n          } else {\n            sdp += 'm=application 0 ' + transceiver.protocol +\n                ' webrtc-datachannel\\r\\n';\n          }\n        } else if (transceiver.kind === 'audio') {\n          sdp += 'm=audio 0 UDP/TLS/RTP/SAVPF 0\\r\\n' +\n              'a=rtpmap:0 PCMU/8000\\r\\n';\n        } else if (transceiver.kind === 'video') {\n          sdp += 'm=video 0 UDP/TLS/RTP/SAVPF 120\\r\\n' +\n              'a=rtpmap:120 VP8/90000\\r\\n';\n        }\n        sdp += 'c=IN IP4 0.0.0.0\\r\\n' +\n            'a=inactive\\r\\n' +\n            'a=mid:' + transceiver.mid + '\\r\\n';\n        return;\n      }\n\n      // FIXME: look at direction.\n      if (transceiver.stream) {\n        var localTrack;\n        if (transceiver.kind === 'audio') {\n          localTrack = transceiver.stream.getAudioTracks()[0];\n        } else if (transceiver.kind === 'video') {\n          localTrack = transceiver.stream.getVideoTracks()[0];\n        }\n        if (localTrack) {\n          // add RTX\n          if (edgeVersion >= 15019 && transceiver.kind === 'video' &&\n              !transceiver.sendEncodingParameters[0].rtx) {\n            transceiver.sendEncodingParameters[0].rtx = {\n              ssrc: transceiver.sendEncodingParameters[0].ssrc + 1\n            };\n          }\n        }\n      }\n\n      // Calculate intersection of capabilities.\n      var commonCapabilities = getCommonCapabilities(\n          transceiver.localCapabilities,\n          transceiver.remoteCapabilities);\n\n      var hasRtx = commonCapabilities.codecs.filter(function(c) {\n        return c.name.toLowerCase() === 'rtx';\n      }).length;\n      if (!hasRtx && transceiver.sendEncodingParameters[0].rtx) {\n        delete transceiver.sendEncodingParameters[0].rtx;\n      }\n\n      sdp += writeMediaSection(transceiver, commonCapabilities,\n          'answer', transceiver.stream, pc._dtlsRole);\n      if (transceiver.rtcpParameters &&\n          transceiver.rtcpParameters.reducedSize) {\n        sdp += 'a=rtcp-rsize\\r\\n';\n      }\n    });\n\n    var desc = new window.RTCSessionDescription({\n      type: 'answer',\n      sdp: sdp\n    });\n    return Promise.resolve(desc);\n  };\n\n  RTCPeerConnection.prototype.addIceCandidate = function(candidate) {\n    var pc = this;\n    var sections;\n    if (candidate && !(candidate.sdpMLineIndex !== undefined ||\n        candidate.sdpMid)) {\n      return Promise.reject(new TypeError('sdpMLineIndex or sdpMid required'));\n    }\n\n    // TODO: needs to go into ops queue.\n    return new Promise(function(resolve, reject) {\n      if (!pc._remoteDescription) {\n        return reject(makeError('InvalidStateError',\n            'Can not add ICE candidate without a remote description'));\n      } else if (!candidate || candidate.candidate === '') {\n        for (var j = 0; j < pc.transceivers.length; j++) {\n          if (pc.transceivers[j].rejected) {\n            continue;\n          }\n          pc.transceivers[j].iceTransport.addRemoteCandidate({});\n          sections = SDPUtils.getMediaSections(pc._remoteDescription.sdp);\n          sections[j] += 'a=end-of-candidates\\r\\n';\n          pc._remoteDescription.sdp =\n              SDPUtils.getDescription(pc._remoteDescription.sdp) +\n              sections.join('');\n          if (pc.usingBundle) {\n            break;\n          }\n        }\n      } else {\n        var sdpMLineIndex = candidate.sdpMLineIndex;\n        if (candidate.sdpMid) {\n          for (var i = 0; i < pc.transceivers.length; i++) {\n            if (pc.transceivers[i].mid === candidate.sdpMid) {\n              sdpMLineIndex = i;\n              break;\n            }\n          }\n        }\n        var transceiver = pc.transceivers[sdpMLineIndex];\n        if (transceiver) {\n          if (transceiver.rejected) {\n            return resolve();\n          }\n          var cand = Object.keys(candidate.candidate).length > 0 ?\n              SDPUtils.parseCandidate(candidate.candidate) : {};\n          // Ignore Chrome's invalid candidates since Edge does not like them.\n          if (cand.protocol === 'tcp' && (cand.port === 0 || cand.port === 9)) {\n            return resolve();\n          }\n          // Ignore RTCP candidates, we assume RTCP-MUX.\n          if (cand.component && cand.component !== 1) {\n            return resolve();\n          }\n          // when using bundle, avoid adding candidates to the wrong\n          // ice transport. And avoid adding candidates added in the SDP.\n          if (sdpMLineIndex === 0 || (sdpMLineIndex > 0 &&\n              transceiver.iceTransport !== pc.transceivers[0].iceTransport)) {\n            if (!maybeAddCandidate(transceiver.iceTransport, cand)) {\n              return reject(makeError('OperationError',\n                  'Can not add ICE candidate'));\n            }\n          }\n\n          // update the remoteDescription.\n          var candidateString = candidate.candidate.trim();\n          if (candidateString.indexOf('a=') === 0) {\n            candidateString = candidateString.substr(2);\n          }\n          sections = SDPUtils.getMediaSections(pc._remoteDescription.sdp);\n          sections[sdpMLineIndex] += 'a=' +\n              (cand.type ? candidateString : 'end-of-candidates')\n              + '\\r\\n';\n          pc._remoteDescription.sdp =\n              SDPUtils.getDescription(pc._remoteDescription.sdp) +\n              sections.join('');\n        } else {\n          return reject(makeError('OperationError',\n              'Can not add ICE candidate'));\n        }\n      }\n      resolve();\n    });\n  };\n\n  RTCPeerConnection.prototype.getStats = function(selector) {\n    if (selector && selector instanceof window.MediaStreamTrack) {\n      var senderOrReceiver = null;\n      this.transceivers.forEach(function(transceiver) {\n        if (transceiver.rtpSender &&\n            transceiver.rtpSender.track === selector) {\n          senderOrReceiver = transceiver.rtpSender;\n        } else if (transceiver.rtpReceiver &&\n            transceiver.rtpReceiver.track === selector) {\n          senderOrReceiver = transceiver.rtpReceiver;\n        }\n      });\n      if (!senderOrReceiver) {\n        throw makeError('InvalidAccessError', 'Invalid selector.');\n      }\n      return senderOrReceiver.getStats();\n    }\n\n    var promises = [];\n    this.transceivers.forEach(function(transceiver) {\n      ['rtpSender', 'rtpReceiver', 'iceGatherer', 'iceTransport',\n          'dtlsTransport'].forEach(function(method) {\n            if (transceiver[method]) {\n              promises.push(transceiver[method].getStats());\n            }\n          });\n    });\n    return Promise.all(promises).then(function(allStats) {\n      var results = new Map();\n      allStats.forEach(function(stats) {\n        stats.forEach(function(stat) {\n          results.set(stat.id, stat);\n        });\n      });\n      return results;\n    });\n  };\n\n  // fix low-level stat names and return Map instead of object.\n  var ortcObjects = ['RTCRtpSender', 'RTCRtpReceiver', 'RTCIceGatherer',\n    'RTCIceTransport', 'RTCDtlsTransport'];\n  ortcObjects.forEach(function(ortcObjectName) {\n    var obj = window[ortcObjectName];\n    if (obj && obj.prototype && obj.prototype.getStats) {\n      var nativeGetstats = obj.prototype.getStats;\n      obj.prototype.getStats = function() {\n        return nativeGetstats.apply(this)\n        .then(function(nativeStats) {\n          var mapStats = new Map();\n          Object.keys(nativeStats).forEach(function(id) {\n            nativeStats[id].type = fixStatsType(nativeStats[id]);\n            mapStats.set(id, nativeStats[id]);\n          });\n          return mapStats;\n        });\n      };\n    }\n  });\n\n  // legacy callback shims. Should be moved to adapter.js some days.\n  var methods = ['createOffer', 'createAnswer'];\n  methods.forEach(function(method) {\n    var nativeMethod = RTCPeerConnection.prototype[method];\n    RTCPeerConnection.prototype[method] = function() {\n      var args = arguments;\n      if (typeof args[0] === 'function' ||\n          typeof args[1] === 'function') { // legacy\n        return nativeMethod.apply(this, [arguments[2]])\n        .then(function(description) {\n          if (typeof args[0] === 'function') {\n            args[0].apply(null, [description]);\n          }\n        }, function(error) {\n          if (typeof args[1] === 'function') {\n            args[1].apply(null, [error]);\n          }\n        });\n      }\n      return nativeMethod.apply(this, arguments);\n    };\n  });\n\n  methods = ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate'];\n  methods.forEach(function(method) {\n    var nativeMethod = RTCPeerConnection.prototype[method];\n    RTCPeerConnection.prototype[method] = function() {\n      var args = arguments;\n      if (typeof args[1] === 'function' ||\n          typeof args[2] === 'function') { // legacy\n        return nativeMethod.apply(this, arguments)\n        .then(function() {\n          if (typeof args[1] === 'function') {\n            args[1].apply(null);\n          }\n        }, function(error) {\n          if (typeof args[2] === 'function') {\n            args[2].apply(null, [error]);\n          }\n        });\n      }\n      return nativeMethod.apply(this, arguments);\n    };\n  });\n\n  // getStats is special. It doesn't have a spec legacy method yet we support\n  // getStats(something, cb) without error callbacks.\n  ['getStats'].forEach(function(method) {\n    var nativeMethod = RTCPeerConnection.prototype[method];\n    RTCPeerConnection.prototype[method] = function() {\n      var args = arguments;\n      if (typeof args[1] === 'function') {\n        return nativeMethod.apply(this, arguments)\n        .then(function() {\n          if (typeof args[1] === 'function') {\n            args[1].apply(null);\n          }\n        });\n      }\n      return nativeMethod.apply(this, arguments);\n    };\n  });\n\n  return RTCPeerConnection;\n};\n","import mod from \"-!../node_modules/vue-style-loader/index.js!../node_modules/css-loader/dist/cjs.js!../node_modules/vue-loader/lib/loaders/stylePostLoader.js!../node_modules/vue-loader/lib/index.js??vue-loader-options!./Scanner.vue?vue&type=style&index=0&id=4ebacf15&scoped=true&lang=css&\"; export default mod; export * from \"-!../node_modules/vue-style-loader/index.js!../node_modules/css-loader/dist/cjs.js!../node_modules/vue-loader/lib/loaders/stylePostLoader.js!../node_modules/vue-loader/lib/index.js??vue-loader-options!./Scanner.vue?vue&type=style&index=0&id=4ebacf15&scoped=true&lang=css&\"","exports = module.exports = require(\"../node_modules/css-loader/dist/runtime/api.js\")(false);\n// Module\nexports.push([module.id, \"\\n.viewport[data-v-4ebacf15] {\\n  position: relative;\\n}\\n.viewport canvas[data-v-4ebacf15],\\n.viewport video[data-v-4ebacf15] {\\n  position: absolute;\\n  left: 0;\\n  top: 0;\\n}\\n\", \"\"]);\n\n","\"use strict\";\n\n/*\n  MIT License http://www.opensource.org/licenses/mit-license.php\n  Author Tobias Koppers @sokra\n*/\n// css base code, injected by the css-loader\nmodule.exports = function (useSourceMap) {\n  var list = []; // return the list of modules as css string\n\n  list.toString = function toString() {\n    return this.map(function (item) {\n      var content = cssWithMappingToString(item, useSourceMap);\n\n      if (item[2]) {\n        return '@media ' + item[2] + '{' + content + '}';\n      } else {\n        return content;\n      }\n    }).join('');\n  }; // import a list of modules into the list\n\n\n  list.i = function (modules, mediaQuery) {\n    if (typeof modules === 'string') {\n      modules = [[null, modules, '']];\n    }\n\n    var alreadyImportedModules = {};\n\n    for (var i = 0; i < this.length; i++) {\n      var id = this[i][0];\n\n      if (id != null) {\n        alreadyImportedModules[id] = true;\n      }\n    }\n\n    for (i = 0; i < modules.length; i++) {\n      var item = modules[i]; // skip already imported module\n      // this implementation is not 100% perfect for weird media query combinations\n      // when a module is imported multiple times with different media queries.\n      // I hope this will never occur (Hey this way we have smaller bundles)\n\n      if (item[0] == null || !alreadyImportedModules[item[0]]) {\n        if (mediaQuery && !item[2]) {\n          item[2] = mediaQuery;\n        } else if (mediaQuery) {\n          item[2] = '(' + item[2] + ') and (' + mediaQuery + ')';\n        }\n\n        list.push(item);\n      }\n    }\n  };\n\n  return list;\n};\n\nfunction cssWithMappingToString(item, useSourceMap) {\n  var content = item[1] || '';\n  var cssMapping = item[3];\n\n  if (!cssMapping) {\n    return content;\n  }\n\n  if (useSourceMap && typeof btoa === 'function') {\n    var sourceMapping = toComment(cssMapping);\n    var sourceURLs = cssMapping.sources.map(function (source) {\n      return '/*# sourceURL=' + cssMapping.sourceRoot + source + ' */';\n    });\n    return [content].concat(sourceURLs).concat([sourceMapping]).join('\\n');\n  }\n\n  return [content].join('\\n');\n} // Adapted from convert-source-map (MIT)\n\n\nfunction toComment(sourceMap) {\n  // eslint-disable-next-line no-undef\n  var base64 = btoa(unescape(encodeURIComponent(JSON.stringify(sourceMap))));\n  var data = 'sourceMappingURL=data:application/json;charset=utf-8;base64,' + base64;\n  return '/*# ' + data + ' */';\n}","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n /* eslint-env node */\n'use strict';\n\nlet logDisabled_ = true;\nlet deprecationWarnings_ = true;\n\n/**\n * Extract browser version out of the provided user agent string.\n *\n * @param {!string} uastring userAgent string.\n * @param {!string} expr Regular expression used as match criteria.\n * @param {!number} pos position in the version string to be returned.\n * @return {!number} browser version.\n */\nexport function extractVersion(uastring, expr, pos) {\n  const match = uastring.match(expr);\n  return match && match.length >= pos && parseInt(match[pos], 10);\n}\n\n// Wraps the peerconnection event eventNameToWrap in a function\n// which returns the modified event object (or false to prevent\n// the event).\nexport function wrapPeerConnectionEvent(window, eventNameToWrap, wrapper) {\n  if (!window.RTCPeerConnection) {\n    return;\n  }\n  const proto = window.RTCPeerConnection.prototype;\n  const nativeAddEventListener = proto.addEventListener;\n  proto.addEventListener = function(nativeEventName, cb) {\n    if (nativeEventName !== eventNameToWrap) {\n      return nativeAddEventListener.apply(this, arguments);\n    }\n    const wrappedCallback = (e) => {\n      const modifiedEvent = wrapper(e);\n      if (modifiedEvent) {\n        cb(modifiedEvent);\n      }\n    };\n    this._eventMap = this._eventMap || {};\n    this._eventMap[cb] = wrappedCallback;\n    return nativeAddEventListener.apply(this, [nativeEventName,\n      wrappedCallback]);\n  };\n\n  const nativeRemoveEventListener = proto.removeEventListener;\n  proto.removeEventListener = function(nativeEventName, cb) {\n    if (nativeEventName !== eventNameToWrap || !this._eventMap\n        || !this._eventMap[cb]) {\n      return nativeRemoveEventListener.apply(this, arguments);\n    }\n    const unwrappedCb = this._eventMap[cb];\n    delete this._eventMap[cb];\n    return nativeRemoveEventListener.apply(this, [nativeEventName,\n      unwrappedCb]);\n  };\n\n  Object.defineProperty(proto, 'on' + eventNameToWrap, {\n    get() {\n      return this['_on' + eventNameToWrap];\n    },\n    set(cb) {\n      if (this['_on' + eventNameToWrap]) {\n        this.removeEventListener(eventNameToWrap,\n            this['_on' + eventNameToWrap]);\n        delete this['_on' + eventNameToWrap];\n      }\n      if (cb) {\n        this.addEventListener(eventNameToWrap,\n            this['_on' + eventNameToWrap] = cb);\n      }\n    },\n    enumerable: true,\n    configurable: true\n  });\n}\n\nexport function disableLog(bool) {\n  if (typeof bool !== 'boolean') {\n    return new Error('Argument type: ' + typeof bool +\n        '. Please use a boolean.');\n  }\n  logDisabled_ = bool;\n  return (bool) ? 'adapter.js logging disabled' :\n      'adapter.js logging enabled';\n}\n\n/**\n * Disable or enable deprecation warnings\n * @param {!boolean} bool set to true to disable warnings.\n */\nexport function disableWarnings(bool) {\n  if (typeof bool !== 'boolean') {\n    return new Error('Argument type: ' + typeof bool +\n        '. Please use a boolean.');\n  }\n  deprecationWarnings_ = !bool;\n  return 'adapter.js deprecation warnings ' + (bool ? 'disabled' : 'enabled');\n}\n\nexport function log() {\n  if (typeof window === 'object') {\n    if (logDisabled_) {\n      return;\n    }\n    if (typeof console !== 'undefined' && typeof console.log === 'function') {\n      console.log.apply(console, arguments);\n    }\n  }\n}\n\n/**\n * Shows a deprecation warning suggesting the modern and spec-compatible API.\n */\nexport function deprecated(oldMethod, newMethod) {\n  if (!deprecationWarnings_) {\n    return;\n  }\n  console.warn(oldMethod + ' is deprecated, please use ' + newMethod +\n      ' instead.');\n}\n\n/**\n * Browser detector.\n *\n * @return {object} result containing browser and version\n *     properties.\n */\nexport function detectBrowser(window) {\n  const {navigator} = window;\n\n  // Returned result object.\n  const result = {browser: null, version: null};\n\n  // Fail early if it's not a browser\n  if (typeof window === 'undefined' || !window.navigator) {\n    result.browser = 'Not a browser.';\n    return result;\n  }\n\n  if (navigator.mozGetUserMedia) { // Firefox.\n    result.browser = 'firefox';\n    result.version = extractVersion(navigator.userAgent,\n        /Firefox\\/(\\d+)\\./, 1);\n  } else if (navigator.webkitGetUserMedia) {\n    // Chrome, Chromium, Webview, Opera.\n    // Version matches Chrome/WebRTC version.\n    result.browser = 'chrome';\n    result.version = extractVersion(navigator.userAgent,\n        /Chrom(e|ium)\\/(\\d+)\\./, 2);\n  } else if (navigator.mediaDevices &&\n      navigator.userAgent.match(/Edge\\/(\\d+).(\\d+)$/)) { // Edge.\n    result.browser = 'edge';\n    result.version = extractVersion(navigator.userAgent,\n        /Edge\\/(\\d+).(\\d+)$/, 2);\n  } else if (window.RTCPeerConnection &&\n      navigator.userAgent.match(/AppleWebKit\\/(\\d+)\\./)) { // Safari.\n    result.browser = 'safari';\n    result.version = extractVersion(navigator.userAgent,\n        /AppleWebKit\\/(\\d+)\\./, 1);\n  } else { // Default fallthrough: not supported.\n    result.browser = 'Not a supported browser.';\n    return result;\n  }\n\n  return result;\n}\n\n/**\n * Remove all empty objects and undefined values\n * from a nested object -- an enhanced and vanilla version\n * of Lodash's `compact`.\n */\nexport function compactObject(data) {\n  if (typeof data !== 'object') {\n    return data;\n  }\n\n  return Object.keys(data).reduce(function(accumulator, key) {\n    const isObject = typeof data[key] === 'object';\n    const value = isObject ? compactObject(data[key]) : data[key];\n    const isEmptyObject = isObject && !Object.keys(value).length;\n    if (value === undefined || isEmptyObject) {\n      return accumulator;\n    }\n\n    return Object.assign(accumulator, {[key]: value});\n  }, {});\n}\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\nimport * as utils from '../utils.js';\nconst logging = utils.log;\n\nexport function shimGetUserMedia(window) {\n  const navigator = window && window.navigator;\n\n  if (!navigator.mediaDevices) {\n    return;\n  }\n\n  const browserDetails = utils.detectBrowser(window);\n\n  const constraintsToChrome_ = function(c) {\n    if (typeof c !== 'object' || c.mandatory || c.optional) {\n      return c;\n    }\n    const cc = {};\n    Object.keys(c).forEach(key => {\n      if (key === 'require' || key === 'advanced' || key === 'mediaSource') {\n        return;\n      }\n      const r = (typeof c[key] === 'object') ? c[key] : {ideal: c[key]};\n      if (r.exact !== undefined && typeof r.exact === 'number') {\n        r.min = r.max = r.exact;\n      }\n      const oldname_ = function(prefix, name) {\n        if (prefix) {\n          return prefix + name.charAt(0).toUpperCase() + name.slice(1);\n        }\n        return (name === 'deviceId') ? 'sourceId' : name;\n      };\n      if (r.ideal !== undefined) {\n        cc.optional = cc.optional || [];\n        let oc = {};\n        if (typeof r.ideal === 'number') {\n          oc[oldname_('min', key)] = r.ideal;\n          cc.optional.push(oc);\n          oc = {};\n          oc[oldname_('max', key)] = r.ideal;\n          cc.optional.push(oc);\n        } else {\n          oc[oldname_('', key)] = r.ideal;\n          cc.optional.push(oc);\n        }\n      }\n      if (r.exact !== undefined && typeof r.exact !== 'number') {\n        cc.mandatory = cc.mandatory || {};\n        cc.mandatory[oldname_('', key)] = r.exact;\n      } else {\n        ['min', 'max'].forEach(mix => {\n          if (r[mix] !== undefined) {\n            cc.mandatory = cc.mandatory || {};\n            cc.mandatory[oldname_(mix, key)] = r[mix];\n          }\n        });\n      }\n    });\n    if (c.advanced) {\n      cc.optional = (cc.optional || []).concat(c.advanced);\n    }\n    return cc;\n  };\n\n  const shimConstraints_ = function(constraints, func) {\n    if (browserDetails.version >= 61) {\n      return func(constraints);\n    }\n    constraints = JSON.parse(JSON.stringify(constraints));\n    if (constraints && typeof constraints.audio === 'object') {\n      const remap = function(obj, a, b) {\n        if (a in obj && !(b in obj)) {\n          obj[b] = obj[a];\n          delete obj[a];\n        }\n      };\n      constraints = JSON.parse(JSON.stringify(constraints));\n      remap(constraints.audio, 'autoGainControl', 'googAutoGainControl');\n      remap(constraints.audio, 'noiseSuppression', 'googNoiseSuppression');\n      constraints.audio = constraintsToChrome_(constraints.audio);\n    }\n    if (constraints && typeof constraints.video === 'object') {\n      // Shim facingMode for mobile & surface pro.\n      let face = constraints.video.facingMode;\n      face = face && ((typeof face === 'object') ? face : {ideal: face});\n      const getSupportedFacingModeLies = browserDetails.version < 66;\n\n      if ((face && (face.exact === 'user' || face.exact === 'environment' ||\n                    face.ideal === 'user' || face.ideal === 'environment')) &&\n          !(navigator.mediaDevices.getSupportedConstraints &&\n            navigator.mediaDevices.getSupportedConstraints().facingMode &&\n            !getSupportedFacingModeLies)) {\n        delete constraints.video.facingMode;\n        let matches;\n        if (face.exact === 'environment' || face.ideal === 'environment') {\n          matches = ['back', 'rear'];\n        } else if (face.exact === 'user' || face.ideal === 'user') {\n          matches = ['front'];\n        }\n        if (matches) {\n          // Look for matches in label, or use last cam for back (typical).\n          return navigator.mediaDevices.enumerateDevices()\n          .then(devices => {\n            devices = devices.filter(d => d.kind === 'videoinput');\n            let dev = devices.find(d => matches.some(match =>\n              d.label.toLowerCase().includes(match)));\n            if (!dev && devices.length && matches.includes('back')) {\n              dev = devices[devices.length - 1]; // more likely the back cam\n            }\n            if (dev) {\n              constraints.video.deviceId = face.exact ? {exact: dev.deviceId} :\n                                                        {ideal: dev.deviceId};\n            }\n            constraints.video = constraintsToChrome_(constraints.video);\n            logging('chrome: ' + JSON.stringify(constraints));\n            return func(constraints);\n          });\n        }\n      }\n      constraints.video = constraintsToChrome_(constraints.video);\n    }\n    logging('chrome: ' + JSON.stringify(constraints));\n    return func(constraints);\n  };\n\n  const shimError_ = function(e) {\n    if (browserDetails.version >= 64) {\n      return e;\n    }\n    return {\n      name: {\n        PermissionDeniedError: 'NotAllowedError',\n        PermissionDismissedError: 'NotAllowedError',\n        InvalidStateError: 'NotAllowedError',\n        DevicesNotFoundError: 'NotFoundError',\n        ConstraintNotSatisfiedError: 'OverconstrainedError',\n        TrackStartError: 'NotReadableError',\n        MediaDeviceFailedDueToShutdown: 'NotAllowedError',\n        MediaDeviceKillSwitchOn: 'NotAllowedError',\n        TabCaptureError: 'AbortError',\n        ScreenCaptureError: 'AbortError',\n        DeviceCaptureError: 'AbortError'\n      }[e.name] || e.name,\n      message: e.message,\n      constraint: e.constraint || e.constraintName,\n      toString() {\n        return this.name + (this.message && ': ') + this.message;\n      }\n    };\n  };\n\n  const getUserMedia_ = function(constraints, onSuccess, onError) {\n    shimConstraints_(constraints, c => {\n      navigator.webkitGetUserMedia(c, onSuccess, e => {\n        if (onError) {\n          onError(shimError_(e));\n        }\n      });\n    });\n  };\n  navigator.getUserMedia = getUserMedia_.bind(navigator);\n\n  // Even though Chrome 45 has navigator.mediaDevices and a getUserMedia\n  // function which returns a Promise, it does not accept spec-style\n  // constraints.\n  const origGetUserMedia = navigator.mediaDevices.getUserMedia.\n      bind(navigator.mediaDevices);\n  navigator.mediaDevices.getUserMedia = function(cs) {\n    return shimConstraints_(cs, c => origGetUserMedia(c).then(stream => {\n      if (c.audio && !stream.getAudioTracks().length ||\n          c.video && !stream.getVideoTracks().length) {\n        stream.getTracks().forEach(track => {\n          track.stop();\n        });\n        throw new DOMException('', 'NotFoundError');\n      }\n      return stream;\n    }, e => Promise.reject(shimError_(e))));\n  };\n}\n","/*\n *  Copyright (c) 2018 The adapter.js project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\nexport function shimGetDisplayMedia(window, getSourceId) {\n  if (window.navigator.mediaDevices &&\n    'getDisplayMedia' in window.navigator.mediaDevices) {\n    return;\n  }\n  if (!(window.navigator.mediaDevices)) {\n    return;\n  }\n  // getSourceId is a function that returns a promise resolving with\n  // the sourceId of the screen/window/tab to be shared.\n  if (typeof getSourceId !== 'function') {\n    console.error('shimGetDisplayMedia: getSourceId argument is not ' +\n        'a function');\n    return;\n  }\n  window.navigator.mediaDevices.getDisplayMedia = function(constraints) {\n    return getSourceId(constraints)\n      .then(sourceId => {\n        const widthSpecified = constraints.video && constraints.video.width;\n        const heightSpecified = constraints.video && constraints.video.height;\n        const frameRateSpecified = constraints.video &&\n          constraints.video.frameRate;\n        constraints.video = {\n          mandatory: {\n            chromeMediaSource: 'desktop',\n            chromeMediaSourceId: sourceId,\n            maxFrameRate: frameRateSpecified || 3\n          }\n        };\n        if (widthSpecified) {\n          constraints.video.mandatory.maxWidth = widthSpecified;\n        }\n        if (heightSpecified) {\n          constraints.video.mandatory.maxHeight = heightSpecified;\n        }\n        return window.navigator.mediaDevices.getUserMedia(constraints);\n      });\n  };\n}\n","\n/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n /* eslint-env node */\n'use strict';\nimport * as utils from '../utils.js';\n\n/* iterates the stats graph recursively. */\nfunction walkStats(stats, base, resultSet) {\n  if (!base || resultSet.has(base.id)) {\n    return;\n  }\n  resultSet.set(base.id, base);\n  Object.keys(base).forEach(name => {\n    if (name.endsWith('Id')) {\n      walkStats(stats, stats.get(base[name]), resultSet);\n    } else if (name.endsWith('Ids')) {\n      base[name].forEach(id => {\n        walkStats(stats, stats.get(id), resultSet);\n      });\n    }\n  });\n}\n\n/* filter getStats for a sender/receiver track. */\nfunction filterStats(result, track, outbound) {\n  const streamStatsType = outbound ? 'outbound-rtp' : 'inbound-rtp';\n  const filteredResult = new Map();\n  if (track === null) {\n    return filteredResult;\n  }\n  const trackStats = [];\n  result.forEach(value => {\n    if (value.type === 'track' &&\n        value.trackIdentifier === track.id) {\n      trackStats.push(value);\n    }\n  });\n  trackStats.forEach(trackStat => {\n    result.forEach(stats => {\n      if (stats.type === streamStatsType && stats.trackId === trackStat.id) {\n        walkStats(result, stats, filteredResult);\n      }\n    });\n  });\n  return filteredResult;\n}\n\nexport {shimGetUserMedia} from './getusermedia';\nexport {shimGetDisplayMedia} from './getdisplaymedia';\n\nexport function shimMediaStream(window) {\n  window.MediaStream = window.MediaStream || window.webkitMediaStream;\n}\n\nexport function shimOnTrack(window) {\n  if (typeof window === 'object' && window.RTCPeerConnection && !('ontrack' in\n      window.RTCPeerConnection.prototype)) {\n    Object.defineProperty(window.RTCPeerConnection.prototype, 'ontrack', {\n      get() {\n        return this._ontrack;\n      },\n      set(f) {\n        if (this._ontrack) {\n          this.removeEventListener('track', this._ontrack);\n        }\n        this.addEventListener('track', this._ontrack = f);\n      },\n      enumerable: true,\n      configurable: true\n    });\n    const origSetRemoteDescription =\n        window.RTCPeerConnection.prototype.setRemoteDescription;\n    window.RTCPeerConnection.prototype.setRemoteDescription = function() {\n      if (!this._ontrackpoly) {\n        this._ontrackpoly = (e) => {\n          // onaddstream does not fire when a track is added to an existing\n          // stream. But stream.onaddtrack is implemented so we use that.\n          e.stream.addEventListener('addtrack', te => {\n            let receiver;\n            if (window.RTCPeerConnection.prototype.getReceivers) {\n              receiver = this.getReceivers()\n                .find(r => r.track && r.track.id === te.track.id);\n            } else {\n              receiver = {track: te.track};\n            }\n\n            const event = new Event('track');\n            event.track = te.track;\n            event.receiver = receiver;\n            event.transceiver = {receiver};\n            event.streams = [e.stream];\n            this.dispatchEvent(event);\n          });\n          e.stream.getTracks().forEach(track => {\n            let receiver;\n            if (window.RTCPeerConnection.prototype.getReceivers) {\n              receiver = this.getReceivers()\n                .find(r => r.track && r.track.id === track.id);\n            } else {\n              receiver = {track};\n            }\n            const event = new Event('track');\n            event.track = track;\n            event.receiver = receiver;\n            event.transceiver = {receiver};\n            event.streams = [e.stream];\n            this.dispatchEvent(event);\n          });\n        };\n        this.addEventListener('addstream', this._ontrackpoly);\n      }\n      return origSetRemoteDescription.apply(this, arguments);\n    };\n  } else {\n    // even if RTCRtpTransceiver is in window, it is only used and\n    // emitted in unified-plan. Unfortunately this means we need\n    // to unconditionally wrap the event.\n    utils.wrapPeerConnectionEvent(window, 'track', e => {\n      if (!e.transceiver) {\n        Object.defineProperty(e, 'transceiver',\n          {value: {receiver: e.receiver}});\n      }\n      return e;\n    });\n  }\n}\n\nexport function shimGetSendersWithDtmf(window) {\n  // Overrides addTrack/removeTrack, depends on shimAddTrackRemoveTrack.\n  if (typeof window === 'object' && window.RTCPeerConnection &&\n      !('getSenders' in window.RTCPeerConnection.prototype) &&\n      'createDTMFSender' in window.RTCPeerConnection.prototype) {\n    const shimSenderWithDtmf = function(pc, track) {\n      return {\n        track,\n        get dtmf() {\n          if (this._dtmf === undefined) {\n            if (track.kind === 'audio') {\n              this._dtmf = pc.createDTMFSender(track);\n            } else {\n              this._dtmf = null;\n            }\n          }\n          return this._dtmf;\n        },\n        _pc: pc\n      };\n    };\n\n    // augment addTrack when getSenders is not available.\n    if (!window.RTCPeerConnection.prototype.getSenders) {\n      window.RTCPeerConnection.prototype.getSenders = function() {\n        this._senders = this._senders || [];\n        return this._senders.slice(); // return a copy of the internal state.\n      };\n      const origAddTrack = window.RTCPeerConnection.prototype.addTrack;\n      window.RTCPeerConnection.prototype.addTrack = function(track, stream) {\n        let sender = origAddTrack.apply(this, arguments);\n        if (!sender) {\n          sender = shimSenderWithDtmf(this, track);\n          this._senders.push(sender);\n        }\n        return sender;\n      };\n\n      const origRemoveTrack = window.RTCPeerConnection.prototype.removeTrack;\n      window.RTCPeerConnection.prototype.removeTrack = function(sender) {\n        origRemoveTrack.apply(this, arguments);\n        const idx = this._senders.indexOf(sender);\n        if (idx !== -1) {\n          this._senders.splice(idx, 1);\n        }\n      };\n    }\n    const origAddStream = window.RTCPeerConnection.prototype.addStream;\n    window.RTCPeerConnection.prototype.addStream = function(stream) {\n      this._senders = this._senders || [];\n      origAddStream.apply(this, [stream]);\n      stream.getTracks().forEach(track => {\n        this._senders.push(shimSenderWithDtmf(this, track));\n      });\n    };\n\n    const origRemoveStream = window.RTCPeerConnection.prototype.removeStream;\n    window.RTCPeerConnection.prototype.removeStream = function(stream) {\n      this._senders = this._senders || [];\n      origRemoveStream.apply(this, [stream]);\n\n      stream.getTracks().forEach(track => {\n        const sender = this._senders.find(s => s.track === track);\n        if (sender) { // remove sender\n          this._senders.splice(this._senders.indexOf(sender), 1);\n        }\n      });\n    };\n  } else if (typeof window === 'object' && window.RTCPeerConnection &&\n             'getSenders' in window.RTCPeerConnection.prototype &&\n             'createDTMFSender' in window.RTCPeerConnection.prototype &&\n             window.RTCRtpSender &&\n             !('dtmf' in window.RTCRtpSender.prototype)) {\n    const origGetSenders = window.RTCPeerConnection.prototype.getSenders;\n    window.RTCPeerConnection.prototype.getSenders = function() {\n      const senders = origGetSenders.apply(this, []);\n      senders.forEach(sender => sender._pc = this);\n      return senders;\n    };\n\n    Object.defineProperty(window.RTCRtpSender.prototype, 'dtmf', {\n      get() {\n        if (this._dtmf === undefined) {\n          if (this.track.kind === 'audio') {\n            this._dtmf = this._pc.createDTMFSender(this.track);\n          } else {\n            this._dtmf = null;\n          }\n        }\n        return this._dtmf;\n      }\n    });\n  }\n}\n\nexport function shimSenderReceiverGetStats(window) {\n  if (!(typeof window === 'object' && window.RTCPeerConnection &&\n      window.RTCRtpSender && window.RTCRtpReceiver)) {\n    return;\n  }\n\n  // shim sender stats.\n  if (!('getStats' in window.RTCRtpSender.prototype)) {\n    const origGetSenders = window.RTCPeerConnection.prototype.getSenders;\n    if (origGetSenders) {\n      window.RTCPeerConnection.prototype.getSenders = function() {\n        const senders = origGetSenders.apply(this, []);\n        senders.forEach(sender => sender._pc = this);\n        return senders;\n      };\n    }\n\n    const origAddTrack = window.RTCPeerConnection.prototype.addTrack;\n    if (origAddTrack) {\n      window.RTCPeerConnection.prototype.addTrack = function() {\n        const sender = origAddTrack.apply(this, arguments);\n        sender._pc = this;\n        return sender;\n      };\n    }\n    window.RTCRtpSender.prototype.getStats = function() {\n      const sender = this;\n      return this._pc.getStats().then(result =>\n        /* Note: this will include stats of all senders that\n         *   send a track with the same id as sender.track as\n         *   it is not possible to identify the RTCRtpSender.\n         */\n        filterStats(result, sender.track, true));\n    };\n  }\n\n  // shim receiver stats.\n  if (!('getStats' in window.RTCRtpReceiver.prototype)) {\n    const origGetReceivers = window.RTCPeerConnection.prototype.getReceivers;\n    if (origGetReceivers) {\n      window.RTCPeerConnection.prototype.getReceivers = function() {\n        const receivers = origGetReceivers.apply(this, []);\n        receivers.forEach(receiver => receiver._pc = this);\n        return receivers;\n      };\n    }\n    utils.wrapPeerConnectionEvent(window, 'track', e => {\n      e.receiver._pc = e.srcElement;\n      return e;\n    });\n    window.RTCRtpReceiver.prototype.getStats = function() {\n      const receiver = this;\n      return this._pc.getStats().then(result =>\n        filterStats(result, receiver.track, false));\n    };\n  }\n\n  if (!('getStats' in window.RTCRtpSender.prototype &&\n      'getStats' in window.RTCRtpReceiver.prototype)) {\n    return;\n  }\n\n  // shim RTCPeerConnection.getStats(track).\n  const origGetStats = window.RTCPeerConnection.prototype.getStats;\n  window.RTCPeerConnection.prototype.getStats = function() {\n    if (arguments.length > 0 &&\n        arguments[0] instanceof window.MediaStreamTrack) {\n      const track = arguments[0];\n      let sender;\n      let receiver;\n      let err;\n      this.getSenders().forEach(s => {\n        if (s.track === track) {\n          if (sender) {\n            err = true;\n          } else {\n            sender = s;\n          }\n        }\n      });\n      this.getReceivers().forEach(r => {\n        if (r.track === track) {\n          if (receiver) {\n            err = true;\n          } else {\n            receiver = r;\n          }\n        }\n        return r.track === track;\n      });\n      if (err || (sender && receiver)) {\n        return Promise.reject(new DOMException(\n          'There are more than one sender or receiver for the track.',\n          'InvalidAccessError'));\n      } else if (sender) {\n        return sender.getStats();\n      } else if (receiver) {\n        return receiver.getStats();\n      }\n      return Promise.reject(new DOMException(\n        'There is no sender or receiver for the track.',\n        'InvalidAccessError'));\n    }\n    return origGetStats.apply(this, arguments);\n  };\n}\n\nexport function shimAddTrackRemoveTrackWithNative(window) {\n  // shim addTrack/removeTrack with native variants in order to make\n  // the interactions with legacy getLocalStreams behave as in other browsers.\n  // Keeps a mapping stream.id => [stream, rtpsenders...]\n  window.RTCPeerConnection.prototype.getLocalStreams = function() {\n    this._shimmedLocalStreams = this._shimmedLocalStreams || {};\n    return Object.keys(this._shimmedLocalStreams)\n      .map(streamId => this._shimmedLocalStreams[streamId][0]);\n  };\n\n  const origAddTrack = window.RTCPeerConnection.prototype.addTrack;\n  window.RTCPeerConnection.prototype.addTrack = function(track, stream) {\n    if (!stream) {\n      return origAddTrack.apply(this, arguments);\n    }\n    this._shimmedLocalStreams = this._shimmedLocalStreams || {};\n\n    const sender = origAddTrack.apply(this, arguments);\n    if (!this._shimmedLocalStreams[stream.id]) {\n      this._shimmedLocalStreams[stream.id] = [stream, sender];\n    } else if (this._shimmedLocalStreams[stream.id].indexOf(sender) === -1) {\n      this._shimmedLocalStreams[stream.id].push(sender);\n    }\n    return sender;\n  };\n\n  const origAddStream = window.RTCPeerConnection.prototype.addStream;\n  window.RTCPeerConnection.prototype.addStream = function(stream) {\n    this._shimmedLocalStreams = this._shimmedLocalStreams || {};\n\n    stream.getTracks().forEach(track => {\n      const alreadyExists = this.getSenders().find(s => s.track === track);\n      if (alreadyExists) {\n        throw new DOMException('Track already exists.',\n            'InvalidAccessError');\n      }\n    });\n    const existingSenders = this.getSenders();\n    origAddStream.apply(this, arguments);\n    const newSenders = this.getSenders()\n      .filter(newSender => existingSenders.indexOf(newSender) === -1);\n    this._shimmedLocalStreams[stream.id] = [stream].concat(newSenders);\n  };\n\n  const origRemoveStream = window.RTCPeerConnection.prototype.removeStream;\n  window.RTCPeerConnection.prototype.removeStream = function(stream) {\n    this._shimmedLocalStreams = this._shimmedLocalStreams || {};\n    delete this._shimmedLocalStreams[stream.id];\n    return origRemoveStream.apply(this, arguments);\n  };\n\n  const origRemoveTrack = window.RTCPeerConnection.prototype.removeTrack;\n  window.RTCPeerConnection.prototype.removeTrack = function(sender) {\n    this._shimmedLocalStreams = this._shimmedLocalStreams || {};\n    if (sender) {\n      Object.keys(this._shimmedLocalStreams).forEach(streamId => {\n        const idx = this._shimmedLocalStreams[streamId].indexOf(sender);\n        if (idx !== -1) {\n          this._shimmedLocalStreams[streamId].splice(idx, 1);\n        }\n        if (this._shimmedLocalStreams[streamId].length === 1) {\n          delete this._shimmedLocalStreams[streamId];\n        }\n      });\n    }\n    return origRemoveTrack.apply(this, arguments);\n  };\n}\n\nexport function shimAddTrackRemoveTrack(window) {\n  if (!window.RTCPeerConnection) {\n    return;\n  }\n  const browserDetails = utils.detectBrowser(window);\n  // shim addTrack and removeTrack.\n  if (window.RTCPeerConnection.prototype.addTrack &&\n      browserDetails.version >= 65) {\n    return shimAddTrackRemoveTrackWithNative(window);\n  }\n\n  // also shim pc.getLocalStreams when addTrack is shimmed\n  // to return the original streams.\n  const origGetLocalStreams = window.RTCPeerConnection.prototype\n      .getLocalStreams;\n  window.RTCPeerConnection.prototype.getLocalStreams = function() {\n    const nativeStreams = origGetLocalStreams.apply(this);\n    this._reverseStreams = this._reverseStreams || {};\n    return nativeStreams.map(stream => this._reverseStreams[stream.id]);\n  };\n\n  const origAddStream = window.RTCPeerConnection.prototype.addStream;\n  window.RTCPeerConnection.prototype.addStream = function(stream) {\n    this._streams = this._streams || {};\n    this._reverseStreams = this._reverseStreams || {};\n\n    stream.getTracks().forEach(track => {\n      const alreadyExists = this.getSenders().find(s => s.track === track);\n      if (alreadyExists) {\n        throw new DOMException('Track already exists.',\n            'InvalidAccessError');\n      }\n    });\n    // Add identity mapping for consistency with addTrack.\n    // Unless this is being used with a stream from addTrack.\n    if (!this._reverseStreams[stream.id]) {\n      const newStream = new window.MediaStream(stream.getTracks());\n      this._streams[stream.id] = newStream;\n      this._reverseStreams[newStream.id] = stream;\n      stream = newStream;\n    }\n    origAddStream.apply(this, [stream]);\n  };\n\n  const origRemoveStream = window.RTCPeerConnection.prototype.removeStream;\n  window.RTCPeerConnection.prototype.removeStream = function(stream) {\n    this._streams = this._streams || {};\n    this._reverseStreams = this._reverseStreams || {};\n\n    origRemoveStream.apply(this, [(this._streams[stream.id] || stream)]);\n    delete this._reverseStreams[(this._streams[stream.id] ?\n        this._streams[stream.id].id : stream.id)];\n    delete this._streams[stream.id];\n  };\n\n  window.RTCPeerConnection.prototype.addTrack = function(track, stream) {\n    if (this.signalingState === 'closed') {\n      throw new DOMException(\n        'The RTCPeerConnection\\'s signalingState is \\'closed\\'.',\n        'InvalidStateError');\n    }\n    const streams = [].slice.call(arguments, 1);\n    if (streams.length !== 1 ||\n        !streams[0].getTracks().find(t => t === track)) {\n      // this is not fully correct but all we can manage without\n      // [[associated MediaStreams]] internal slot.\n      throw new DOMException(\n        'The adapter.js addTrack polyfill only supports a single ' +\n        ' stream which is associated with the specified track.',\n        'NotSupportedError');\n    }\n\n    const alreadyExists = this.getSenders().find(s => s.track === track);\n    if (alreadyExists) {\n      throw new DOMException('Track already exists.',\n          'InvalidAccessError');\n    }\n\n    this._streams = this._streams || {};\n    this._reverseStreams = this._reverseStreams || {};\n    const oldStream = this._streams[stream.id];\n    if (oldStream) {\n      // this is using odd Chrome behaviour, use with caution:\n      // https://bugs.chromium.org/p/webrtc/issues/detail?id=7815\n      // Note: we rely on the high-level addTrack/dtmf shim to\n      // create the sender with a dtmf sender.\n      oldStream.addTrack(track);\n\n      // Trigger ONN async.\n      Promise.resolve().then(() => {\n        this.dispatchEvent(new Event('negotiationneeded'));\n      });\n    } else {\n      const newStream = new window.MediaStream([track]);\n      this._streams[stream.id] = newStream;\n      this._reverseStreams[newStream.id] = stream;\n      this.addStream(newStream);\n    }\n    return this.getSenders().find(s => s.track === track);\n  };\n\n  // replace the internal stream id with the external one and\n  // vice versa.\n  function replaceInternalStreamId(pc, description) {\n    let sdp = description.sdp;\n    Object.keys(pc._reverseStreams || []).forEach(internalId => {\n      const externalStream = pc._reverseStreams[internalId];\n      const internalStream = pc._streams[externalStream.id];\n      sdp = sdp.replace(new RegExp(internalStream.id, 'g'),\n          externalStream.id);\n    });\n    return new RTCSessionDescription({\n      type: description.type,\n      sdp\n    });\n  }\n  function replaceExternalStreamId(pc, description) {\n    let sdp = description.sdp;\n    Object.keys(pc._reverseStreams || []).forEach(internalId => {\n      const externalStream = pc._reverseStreams[internalId];\n      const internalStream = pc._streams[externalStream.id];\n      sdp = sdp.replace(new RegExp(externalStream.id, 'g'),\n          internalStream.id);\n    });\n    return new RTCSessionDescription({\n      type: description.type,\n      sdp\n    });\n  }\n  ['createOffer', 'createAnswer'].forEach(function(method) {\n    const nativeMethod = window.RTCPeerConnection.prototype[method];\n    window.RTCPeerConnection.prototype[method] = function() {\n      const args = arguments;\n      const isLegacyCall = arguments.length &&\n          typeof arguments[0] === 'function';\n      if (isLegacyCall) {\n        return nativeMethod.apply(this, [\n          (description) => {\n            const desc = replaceInternalStreamId(this, description);\n            args[0].apply(null, [desc]);\n          },\n          (err) => {\n            if (args[1]) {\n              args[1].apply(null, err);\n            }\n          }, arguments[2]\n        ]);\n      }\n      return nativeMethod.apply(this, arguments)\n      .then(description => replaceInternalStreamId(this, description));\n    };\n  });\n\n  const origSetLocalDescription =\n      window.RTCPeerConnection.prototype.setLocalDescription;\n  window.RTCPeerConnection.prototype.setLocalDescription = function() {\n    if (!arguments.length || !arguments[0].type) {\n      return origSetLocalDescription.apply(this, arguments);\n    }\n    arguments[0] = replaceExternalStreamId(this, arguments[0]);\n    return origSetLocalDescription.apply(this, arguments);\n  };\n\n  // TODO: mangle getStats: https://w3c.github.io/webrtc-stats/#dom-rtcmediastreamstats-streamidentifier\n\n  const origLocalDescription = Object.getOwnPropertyDescriptor(\n      window.RTCPeerConnection.prototype, 'localDescription');\n  Object.defineProperty(window.RTCPeerConnection.prototype,\n      'localDescription', {\n        get() {\n          const description = origLocalDescription.get.apply(this);\n          if (description.type === '') {\n            return description;\n          }\n          return replaceInternalStreamId(this, description);\n        }\n      });\n\n  window.RTCPeerConnection.prototype.removeTrack = function(sender) {\n    if (this.signalingState === 'closed') {\n      throw new DOMException(\n        'The RTCPeerConnection\\'s signalingState is \\'closed\\'.',\n        'InvalidStateError');\n    }\n    // We can not yet check for sender instanceof RTCRtpSender\n    // since we shim RTPSender. So we check if sender._pc is set.\n    if (!sender._pc) {\n      throw new DOMException('Argument 1 of RTCPeerConnection.removeTrack ' +\n          'does not implement interface RTCRtpSender.', 'TypeError');\n    }\n    const isLocal = sender._pc === this;\n    if (!isLocal) {\n      throw new DOMException('Sender was not created by this connection.',\n          'InvalidAccessError');\n    }\n\n    // Search for the native stream the senders track belongs to.\n    this._streams = this._streams || {};\n    let stream;\n    Object.keys(this._streams).forEach(streamid => {\n      const hasTrack = this._streams[streamid].getTracks()\n        .find(track => sender.track === track);\n      if (hasTrack) {\n        stream = this._streams[streamid];\n      }\n    });\n\n    if (stream) {\n      if (stream.getTracks().length === 1) {\n        // if this is the last track of the stream, remove the stream. This\n        // takes care of any shimmed _senders.\n        this.removeStream(this._reverseStreams[stream.id]);\n      } else {\n        // relying on the same odd chrome behaviour as above.\n        stream.removeTrack(sender.track);\n      }\n      this.dispatchEvent(new Event('negotiationneeded'));\n    }\n  };\n}\n\nexport function shimPeerConnection(window) {\n  if (!window.RTCPeerConnection && window.webkitRTCPeerConnection) {\n    // very basic support for old versions.\n    window.RTCPeerConnection = window.webkitRTCPeerConnection;\n  }\n  if (!window.RTCPeerConnection) {\n    return;\n  }\n\n  const origGetStats = window.RTCPeerConnection.prototype.getStats;\n  window.RTCPeerConnection.prototype.getStats = function(selector,\n      successCallback, errorCallback) {\n    const args = arguments;\n\n    // If selector is a function then we are in the old style stats so just\n    // pass back the original getStats format to avoid breaking old users.\n    if (arguments.length > 0 && typeof selector === 'function') {\n      return origGetStats.apply(this, arguments);\n    }\n\n    // When spec-style getStats is supported, return those when called with\n    // either no arguments or the selector argument is null.\n    if (origGetStats.length === 0 && (arguments.length === 0 ||\n        typeof arguments[0] !== 'function')) {\n      return origGetStats.apply(this, []);\n    }\n\n    const fixChromeStats_ = function(response) {\n      const standardReport = {};\n      const reports = response.result();\n      reports.forEach(report => {\n        const standardStats = {\n          id: report.id,\n          timestamp: report.timestamp,\n          type: {\n            localcandidate: 'local-candidate',\n            remotecandidate: 'remote-candidate'\n          }[report.type] || report.type\n        };\n        report.names().forEach(name => {\n          standardStats[name] = report.stat(name);\n        });\n        standardReport[standardStats.id] = standardStats;\n      });\n\n      return standardReport;\n    };\n\n    // shim getStats with maplike support\n    const makeMapStats = function(stats) {\n      return new Map(Object.keys(stats).map(key => [key, stats[key]]));\n    };\n\n    if (arguments.length >= 2) {\n      const successCallbackWrapper_ = function(response) {\n        args[1](makeMapStats(fixChromeStats_(response)));\n      };\n\n      return origGetStats.apply(this, [successCallbackWrapper_,\n        arguments[0]]);\n    }\n\n    // promise-support\n    return new Promise((resolve, reject) => {\n      origGetStats.apply(this, [\n        function(response) {\n          resolve(makeMapStats(fixChromeStats_(response)));\n        }, reject]);\n    }).then(successCallback, errorCallback);\n  };\n\n  // shim implicit creation of RTCSessionDescription/RTCIceCandidate\n  ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate']\n      .forEach(function(method) {\n        const nativeMethod = window.RTCPeerConnection.prototype[method];\n        window.RTCPeerConnection.prototype[method] = function() {\n          arguments[0] = new ((method === 'addIceCandidate') ?\n              window.RTCIceCandidate :\n              window.RTCSessionDescription)(arguments[0]);\n          return nativeMethod.apply(this, arguments);\n        };\n      });\n\n  // support for addIceCandidate(null or undefined)\n  const nativeAddIceCandidate =\n      window.RTCPeerConnection.prototype.addIceCandidate;\n  window.RTCPeerConnection.prototype.addIceCandidate = function() {\n    if (!arguments[0]) {\n      if (arguments[1]) {\n        arguments[1].apply(null);\n      }\n      return Promise.resolve();\n    }\n    return nativeAddIceCandidate.apply(this, arguments);\n  };\n}\n\nexport function fixNegotiationNeeded(window) {\n  utils.wrapPeerConnectionEvent(window, 'negotiationneeded', e => {\n    const pc = e.target;\n    if (pc.signalingState !== 'stable') {\n      return;\n    }\n    return e;\n  });\n}\n","/*\n *  Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\n\nimport * as utils from '../utils';\n// Edge does not like\n// 1) stun: filtered after 14393 unless ?transport=udp is present\n// 2) turn: that does not have all of turn:host:port?transport=udp\n// 3) turn: with ipv6 addresses\n// 4) turn: occurring muliple times\nexport function filterIceServers(iceServers, edgeVersion) {\n  let hasTurn = false;\n  iceServers = JSON.parse(JSON.stringify(iceServers));\n  return iceServers.filter(server => {\n    if (server && (server.urls || server.url)) {\n      var urls = server.urls || server.url;\n      if (server.url && !server.urls) {\n        utils.deprecated('RTCIceServer.url', 'RTCIceServer.urls');\n      }\n      const isString = typeof urls === 'string';\n      if (isString) {\n        urls = [urls];\n      }\n      urls = urls.filter(url => {\n        // filter STUN unconditionally.\n        if (url.indexOf('stun:') === 0) {\n          return false;\n        }\n\n        const validTurn = url.startsWith('turn') &&\n            !url.startsWith('turn:[') &&\n            url.includes('transport=udp');\n        if (validTurn && !hasTurn) {\n          hasTurn = true;\n          return true;\n        }\n        return validTurn && !hasTurn;\n      });\n\n      delete server.url;\n      server.urls = isString ? urls[0] : urls;\n      return !!urls.length;\n    }\n  });\n}\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n /* eslint-env node */\n'use strict';\n\nexport function shimGetUserMedia(window) {\n  const navigator = window && window.navigator;\n\n  const shimError_ = function(e) {\n    return {\n      name: {PermissionDeniedError: 'NotAllowedError'}[e.name] || e.name,\n      message: e.message,\n      constraint: e.constraint,\n      toString() {\n        return this.name;\n      }\n    };\n  };\n\n  // getUserMedia error shim.\n  const origGetUserMedia = navigator.mediaDevices.getUserMedia.\n      bind(navigator.mediaDevices);\n  navigator.mediaDevices.getUserMedia = function(c) {\n    return origGetUserMedia(c).catch(e => Promise.reject(shimError_(e)));\n  };\n}\n","/*\n *  Copyright (c) 2018 The adapter.js project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n /* eslint-env node */\n'use strict';\n\nexport function shimGetDisplayMedia(window) {\n  if (!('getDisplayMedia' in window.navigator)) {\n    return;\n  }\n  if (!(window.navigator.mediaDevices)) {\n    return;\n  }\n  if (window.navigator.mediaDevices &&\n    'getDisplayMedia' in window.navigator.mediaDevices) {\n    return;\n  }\n  window.navigator.mediaDevices.getDisplayMedia =\n    window.navigator.getDisplayMedia.bind(window.navigator.mediaDevices);\n}\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\n\nimport * as utils from '../utils';\nimport {filterIceServers} from './filtericeservers';\nimport shimRTCPeerConnection from 'rtcpeerconnection-shim';\n\nexport {shimGetUserMedia} from './getusermedia';\nexport {shimGetDisplayMedia} from './getdisplaymedia';\n\nexport function shimPeerConnection(window) {\n  const browserDetails = utils.detectBrowser(window);\n\n  if (window.RTCIceGatherer) {\n    if (!window.RTCIceCandidate) {\n      window.RTCIceCandidate = function(args) {\n        return args;\n      };\n    }\n    if (!window.RTCSessionDescription) {\n      window.RTCSessionDescription = function(args) {\n        return args;\n      };\n    }\n    // this adds an additional event listener to MediaStrackTrack that signals\n    // when a tracks enabled property was changed. Workaround for a bug in\n    // addStream, see below. No longer required in 15025+\n    if (browserDetails.version < 15025) {\n      const origMSTEnabled = Object.getOwnPropertyDescriptor(\n          window.MediaStreamTrack.prototype, 'enabled');\n      Object.defineProperty(window.MediaStreamTrack.prototype, 'enabled', {\n        set(value) {\n          origMSTEnabled.set.call(this, value);\n          const ev = new Event('enabled');\n          ev.enabled = value;\n          this.dispatchEvent(ev);\n        }\n      });\n    }\n  }\n\n  // ORTC defines the DTMF sender a bit different.\n  // https://github.com/w3c/ortc/issues/714\n  if (window.RTCRtpSender && !('dtmf' in window.RTCRtpSender.prototype)) {\n    Object.defineProperty(window.RTCRtpSender.prototype, 'dtmf', {\n      get() {\n        if (this._dtmf === undefined) {\n          if (this.track.kind === 'audio') {\n            this._dtmf = new window.RTCDtmfSender(this);\n          } else if (this.track.kind === 'video') {\n            this._dtmf = null;\n          }\n        }\n        return this._dtmf;\n      }\n    });\n  }\n  // Edge currently only implements the RTCDtmfSender, not the\n  // RTCDTMFSender alias. See http://draft.ortc.org/#rtcdtmfsender2*\n  if (window.RTCDtmfSender && !window.RTCDTMFSender) {\n    window.RTCDTMFSender = window.RTCDtmfSender;\n  }\n\n  const RTCPeerConnectionShim = shimRTCPeerConnection(window,\n      browserDetails.version);\n  window.RTCPeerConnection = function(config) {\n    if (config && config.iceServers) {\n      config.iceServers = filterIceServers(config.iceServers,\n        browserDetails.version);\n      utils.log('ICE servers after filtering:', config.iceServers);\n    }\n    return new RTCPeerConnectionShim(config);\n  };\n  window.RTCPeerConnection.prototype = RTCPeerConnectionShim.prototype;\n}\n\nexport function shimReplaceTrack(window) {\n  // ORTC has replaceTrack -- https://github.com/w3c/ortc/issues/614\n  if (window.RTCRtpSender &&\n      !('replaceTrack' in window.RTCRtpSender.prototype)) {\n    window.RTCRtpSender.prototype.replaceTrack =\n        window.RTCRtpSender.prototype.setTrack;\n  }\n}\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\n\nimport * as utils from '../utils';\n\nexport function shimGetUserMedia(window) {\n  const browserDetails = utils.detectBrowser(window);\n  const navigator = window && window.navigator;\n  const MediaStreamTrack = window && window.MediaStreamTrack;\n\n  navigator.getUserMedia = function(constraints, onSuccess, onError) {\n    // Replace Firefox 44+'s deprecation warning with unprefixed version.\n    utils.deprecated('navigator.getUserMedia',\n        'navigator.mediaDevices.getUserMedia');\n    navigator.mediaDevices.getUserMedia(constraints).then(onSuccess, onError);\n  };\n\n  if (!(browserDetails.version > 55 &&\n      'autoGainControl' in navigator.mediaDevices.getSupportedConstraints())) {\n    const remap = function(obj, a, b) {\n      if (a in obj && !(b in obj)) {\n        obj[b] = obj[a];\n        delete obj[a];\n      }\n    };\n\n    const nativeGetUserMedia = navigator.mediaDevices.getUserMedia.\n        bind(navigator.mediaDevices);\n    navigator.mediaDevices.getUserMedia = function(c) {\n      if (typeof c === 'object' && typeof c.audio === 'object') {\n        c = JSON.parse(JSON.stringify(c));\n        remap(c.audio, 'autoGainControl', 'mozAutoGainControl');\n        remap(c.audio, 'noiseSuppression', 'mozNoiseSuppression');\n      }\n      return nativeGetUserMedia(c);\n    };\n\n    if (MediaStreamTrack && MediaStreamTrack.prototype.getSettings) {\n      const nativeGetSettings = MediaStreamTrack.prototype.getSettings;\n      MediaStreamTrack.prototype.getSettings = function() {\n        const obj = nativeGetSettings.apply(this, arguments);\n        remap(obj, 'mozAutoGainControl', 'autoGainControl');\n        remap(obj, 'mozNoiseSuppression', 'noiseSuppression');\n        return obj;\n      };\n    }\n\n    if (MediaStreamTrack && MediaStreamTrack.prototype.applyConstraints) {\n      const nativeApplyConstraints =\n        MediaStreamTrack.prototype.applyConstraints;\n      MediaStreamTrack.prototype.applyConstraints = function(c) {\n        if (this.kind === 'audio' && typeof c === 'object') {\n          c = JSON.parse(JSON.stringify(c));\n          remap(c, 'autoGainControl', 'mozAutoGainControl');\n          remap(c, 'noiseSuppression', 'mozNoiseSuppression');\n        }\n        return nativeApplyConstraints.apply(this, [c]);\n      };\n    }\n  }\n}\n","/*\n *  Copyright (c) 2018 The adapter.js project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\n\nexport function shimGetDisplayMedia(window, preferredMediaSource) {\n  if (window.navigator.mediaDevices &&\n    'getDisplayMedia' in window.navigator.mediaDevices) {\n    return;\n  }\n  if (!(window.navigator.mediaDevices)) {\n    return;\n  }\n  window.navigator.mediaDevices.getDisplayMedia = function(constraints) {\n    if (!(constraints && constraints.video)) {\n      const err = new DOMException('getDisplayMedia without video ' +\n          'constraints is undefined');\n      err.name = 'NotFoundError';\n      // from https://heycam.github.io/webidl/#idl-DOMException-error-names\n      err.code = 8;\n      return Promise.reject(err);\n    }\n    if (constraints.video === true) {\n      constraints.video = {mediaSource: preferredMediaSource};\n    } else {\n      constraints.video.mediaSource = preferredMediaSource;\n    }\n    return window.navigator.mediaDevices.getUserMedia(constraints);\n  };\n}\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\n\nimport * as utils from '../utils';\nexport {shimGetUserMedia} from './getusermedia';\nexport {shimGetDisplayMedia} from './getdisplaymedia';\n\nexport function shimOnTrack(window) {\n  if (typeof window === 'object' && window.RTCTrackEvent &&\n      ('receiver' in window.RTCTrackEvent.prototype) &&\n      !('transceiver' in window.RTCTrackEvent.prototype)) {\n    Object.defineProperty(window.RTCTrackEvent.prototype, 'transceiver', {\n      get() {\n        return {receiver: this.receiver};\n      }\n    });\n  }\n}\n\nexport function shimPeerConnection(window) {\n  const browserDetails = utils.detectBrowser(window);\n\n  if (typeof window !== 'object' ||\n      !(window.RTCPeerConnection || window.mozRTCPeerConnection)) {\n    return; // probably media.peerconnection.enabled=false in about:config\n  }\n  if (!window.RTCPeerConnection && window.mozRTCPeerConnection) {\n    // very basic support for old versions.\n    window.RTCPeerConnection = window.mozRTCPeerConnection;\n  }\n\n  // shim away need for obsolete RTCIceCandidate/RTCSessionDescription.\n  ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate']\n      .forEach(function(method) {\n        const nativeMethod = window.RTCPeerConnection.prototype[method];\n        window.RTCPeerConnection.prototype[method] = function() {\n          arguments[0] = new ((method === 'addIceCandidate') ?\n              window.RTCIceCandidate :\n              window.RTCSessionDescription)(arguments[0]);\n          return nativeMethod.apply(this, arguments);\n        };\n      });\n\n  // support for addIceCandidate(null or undefined)\n  const nativeAddIceCandidate =\n      window.RTCPeerConnection.prototype.addIceCandidate;\n  window.RTCPeerConnection.prototype.addIceCandidate = function() {\n    if (!arguments[0]) {\n      if (arguments[1]) {\n        arguments[1].apply(null);\n      }\n      return Promise.resolve();\n    }\n    return nativeAddIceCandidate.apply(this, arguments);\n  };\n\n  const modernStatsTypes = {\n    inboundrtp: 'inbound-rtp',\n    outboundrtp: 'outbound-rtp',\n    candidatepair: 'candidate-pair',\n    localcandidate: 'local-candidate',\n    remotecandidate: 'remote-candidate'\n  };\n\n  const nativeGetStats = window.RTCPeerConnection.prototype.getStats;\n  window.RTCPeerConnection.prototype.getStats = function(\n    selector,\n    onSucc,\n    onErr\n  ) {\n    return nativeGetStats.apply(this, [selector || null])\n      .then(stats => {\n        if (browserDetails.version < 53 && !onSucc) {\n          // Shim only promise getStats with spec-hyphens in type names\n          // Leave callback version alone; misc old uses of forEach before Map\n          try {\n            stats.forEach(stat => {\n              stat.type = modernStatsTypes[stat.type] || stat.type;\n            });\n          } catch (e) {\n            if (e.name !== 'TypeError') {\n              throw e;\n            }\n            // Avoid TypeError: \"type\" is read-only, in old versions. 34-43ish\n            stats.forEach((stat, i) => {\n              stats.set(i, Object.assign({}, stat, {\n                type: modernStatsTypes[stat.type] || stat.type\n              }));\n            });\n          }\n        }\n        return stats;\n      })\n      .then(onSucc, onErr);\n  };\n}\n\nexport function shimSenderGetStats(window) {\n  if (!(typeof window === 'object' && window.RTCPeerConnection &&\n      window.RTCRtpSender)) {\n    return;\n  }\n  if (window.RTCRtpSender && 'getStats' in window.RTCRtpSender.prototype) {\n    return;\n  }\n  const origGetSenders = window.RTCPeerConnection.prototype.getSenders;\n  if (origGetSenders) {\n    window.RTCPeerConnection.prototype.getSenders = function() {\n      const senders = origGetSenders.apply(this, []);\n      senders.forEach(sender => sender._pc = this);\n      return senders;\n    };\n  }\n\n  const origAddTrack = window.RTCPeerConnection.prototype.addTrack;\n  if (origAddTrack) {\n    window.RTCPeerConnection.prototype.addTrack = function() {\n      const sender = origAddTrack.apply(this, arguments);\n      sender._pc = this;\n      return sender;\n    };\n  }\n  window.RTCRtpSender.prototype.getStats = function() {\n    return this.track ? this._pc.getStats(this.track) :\n        Promise.resolve(new Map());\n  };\n}\n\nexport function shimReceiverGetStats(window) {\n  if (!(typeof window === 'object' && window.RTCPeerConnection &&\n      window.RTCRtpSender)) {\n    return;\n  }\n  if (window.RTCRtpSender && 'getStats' in window.RTCRtpReceiver.prototype) {\n    return;\n  }\n  const origGetReceivers = window.RTCPeerConnection.prototype.getReceivers;\n  if (origGetReceivers) {\n    window.RTCPeerConnection.prototype.getReceivers = function() {\n      const receivers = origGetReceivers.apply(this, []);\n      receivers.forEach(receiver => receiver._pc = this);\n      return receivers;\n    };\n  }\n  utils.wrapPeerConnectionEvent(window, 'track', e => {\n    e.receiver._pc = e.srcElement;\n    return e;\n  });\n  window.RTCRtpReceiver.prototype.getStats = function() {\n    return this._pc.getStats(this.track);\n  };\n}\n\nexport function shimRemoveStream(window) {\n  if (!window.RTCPeerConnection ||\n      'removeStream' in window.RTCPeerConnection.prototype) {\n    return;\n  }\n  window.RTCPeerConnection.prototype.removeStream = function(stream) {\n    utils.deprecated('removeStream', 'removeTrack');\n    this.getSenders().forEach(sender => {\n      if (sender.track && stream.getTracks().includes(sender.track)) {\n        this.removeTrack(sender);\n      }\n    });\n  };\n}\n\nexport function shimRTCDataChannel(window) {\n  // rename DataChannel to RTCDataChannel (native fix in FF60):\n  // https://bugzilla.mozilla.org/show_bug.cgi?id=1173851\n  if (window.DataChannel && !window.RTCDataChannel) {\n    window.RTCDataChannel = window.DataChannel;\n  }\n}\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n'use strict';\nimport * as utils from '../utils';\n\nexport function shimLocalStreamsAPI(window) {\n  if (typeof window !== 'object' || !window.RTCPeerConnection) {\n    return;\n  }\n  if (!('getLocalStreams' in window.RTCPeerConnection.prototype)) {\n    window.RTCPeerConnection.prototype.getLocalStreams = function() {\n      if (!this._localStreams) {\n        this._localStreams = [];\n      }\n      return this._localStreams;\n    };\n  }\n  if (!('addStream' in window.RTCPeerConnection.prototype)) {\n    const _addTrack = window.RTCPeerConnection.prototype.addTrack;\n    window.RTCPeerConnection.prototype.addStream = function(stream) {\n      if (!this._localStreams) {\n        this._localStreams = [];\n      }\n      if (!this._localStreams.includes(stream)) {\n        this._localStreams.push(stream);\n      }\n      stream.getTracks().forEach(track => _addTrack.call(this, track, stream));\n    };\n\n    window.RTCPeerConnection.prototype.addTrack = function(track, stream) {\n      if (stream) {\n        if (!this._localStreams) {\n          this._localStreams = [stream];\n        } else if (!this._localStreams.includes(stream)) {\n          this._localStreams.push(stream);\n        }\n      }\n      return _addTrack.call(this, track, stream);\n    };\n  }\n  if (!('removeStream' in window.RTCPeerConnection.prototype)) {\n    window.RTCPeerConnection.prototype.removeStream = function(stream) {\n      if (!this._localStreams) {\n        this._localStreams = [];\n      }\n      const index = this._localStreams.indexOf(stream);\n      if (index === -1) {\n        return;\n      }\n      this._localStreams.splice(index, 1);\n      const tracks = stream.getTracks();\n      this.getSenders().forEach(sender => {\n        if (tracks.includes(sender.track)) {\n          this.removeTrack(sender);\n        }\n      });\n    };\n  }\n}\n\nexport function shimRemoteStreamsAPI(window) {\n  if (typeof window !== 'object' || !window.RTCPeerConnection) {\n    return;\n  }\n  if (!('getRemoteStreams' in window.RTCPeerConnection.prototype)) {\n    window.RTCPeerConnection.prototype.getRemoteStreams = function() {\n      return this._remoteStreams ? this._remoteStreams : [];\n    };\n  }\n  if (!('onaddstream' in window.RTCPeerConnection.prototype)) {\n    Object.defineProperty(window.RTCPeerConnection.prototype, 'onaddstream', {\n      get() {\n        return this._onaddstream;\n      },\n      set(f) {\n        if (this._onaddstream) {\n          this.removeEventListener('addstream', this._onaddstream);\n          this.removeEventListener('track', this._onaddstreampoly);\n        }\n        this.addEventListener('addstream', this._onaddstream = f);\n        this.addEventListener('track', this._onaddstreampoly = (e) => {\n          e.streams.forEach(stream => {\n            if (!this._remoteStreams) {\n              this._remoteStreams = [];\n            }\n            if (this._remoteStreams.includes(stream)) {\n              return;\n            }\n            this._remoteStreams.push(stream);\n            const event = new Event('addstream');\n            event.stream = stream;\n            this.dispatchEvent(event);\n          });\n        });\n      }\n    });\n    const origSetRemoteDescription =\n      window.RTCPeerConnection.prototype.setRemoteDescription;\n    window.RTCPeerConnection.prototype.setRemoteDescription = function() {\n      const pc = this;\n      if (!this._onaddstreampoly) {\n        this.addEventListener('track', this._onaddstreampoly = function(e) {\n          e.streams.forEach(stream => {\n            if (!pc._remoteStreams) {\n              pc._remoteStreams = [];\n            }\n            if (pc._remoteStreams.indexOf(stream) >= 0) {\n              return;\n            }\n            pc._remoteStreams.push(stream);\n            const event = new Event('addstream');\n            event.stream = stream;\n            pc.dispatchEvent(event);\n          });\n        });\n      }\n      return origSetRemoteDescription.apply(pc, arguments);\n    };\n  }\n}\n\nexport function shimCallbacksAPI(window) {\n  if (typeof window !== 'object' || !window.RTCPeerConnection) {\n    return;\n  }\n  const prototype = window.RTCPeerConnection.prototype;\n  const createOffer = prototype.createOffer;\n  const createAnswer = prototype.createAnswer;\n  const setLocalDescription = prototype.setLocalDescription;\n  const setRemoteDescription = prototype.setRemoteDescription;\n  const addIceCandidate = prototype.addIceCandidate;\n\n  prototype.createOffer = function(successCallback, failureCallback) {\n    const options = (arguments.length >= 2) ? arguments[2] : arguments[0];\n    const promise = createOffer.apply(this, [options]);\n    if (!failureCallback) {\n      return promise;\n    }\n    promise.then(successCallback, failureCallback);\n    return Promise.resolve();\n  };\n\n  prototype.createAnswer = function(successCallback, failureCallback) {\n    const options = (arguments.length >= 2) ? arguments[2] : arguments[0];\n    const promise = createAnswer.apply(this, [options]);\n    if (!failureCallback) {\n      return promise;\n    }\n    promise.then(successCallback, failureCallback);\n    return Promise.resolve();\n  };\n\n  let withCallback = function(description, successCallback, failureCallback) {\n    const promise = setLocalDescription.apply(this, [description]);\n    if (!failureCallback) {\n      return promise;\n    }\n    promise.then(successCallback, failureCallback);\n    return Promise.resolve();\n  };\n  prototype.setLocalDescription = withCallback;\n\n  withCallback = function(description, successCallback, failureCallback) {\n    const promise = setRemoteDescription.apply(this, [description]);\n    if (!failureCallback) {\n      return promise;\n    }\n    promise.then(successCallback, failureCallback);\n    return Promise.resolve();\n  };\n  prototype.setRemoteDescription = withCallback;\n\n  withCallback = function(candidate, successCallback, failureCallback) {\n    const promise = addIceCandidate.apply(this, [candidate]);\n    if (!failureCallback) {\n      return promise;\n    }\n    promise.then(successCallback, failureCallback);\n    return Promise.resolve();\n  };\n  prototype.addIceCandidate = withCallback;\n}\n\nexport function shimGetUserMedia(window) {\n  const navigator = window && window.navigator;\n\n  if (navigator.mediaDevices && navigator.mediaDevices.getUserMedia) {\n    // shim not needed in Safari 12.1\n    const mediaDevices = navigator.mediaDevices;\n    const _getUserMedia = mediaDevices.getUserMedia.bind(mediaDevices);\n    navigator.mediaDevices.getUserMedia = (constraints) => {\n      return _getUserMedia(shimConstraints(constraints));\n    };\n  }\n\n  if (!navigator.getUserMedia && navigator.mediaDevices &&\n    navigator.mediaDevices.getUserMedia) {\n    navigator.getUserMedia = function(constraints, cb, errcb) {\n      navigator.mediaDevices.getUserMedia(constraints)\n      .then(cb, errcb);\n    }.bind(navigator);\n  }\n}\n\nexport function shimConstraints(constraints) {\n  if (constraints && constraints.video !== undefined) {\n    return Object.assign({},\n      constraints,\n      {video: utils.compactObject(constraints.video)}\n    );\n  }\n\n  return constraints;\n}\n\nexport function shimRTCIceServerUrls(window) {\n  // migrate from non-spec RTCIceServer.url to RTCIceServer.urls\n  const OrigPeerConnection = window.RTCPeerConnection;\n  window.RTCPeerConnection = function(pcConfig, pcConstraints) {\n    if (pcConfig && pcConfig.iceServers) {\n      const newIceServers = [];\n      for (let i = 0; i < pcConfig.iceServers.length; i++) {\n        let server = pcConfig.iceServers[i];\n        if (!server.hasOwnProperty('urls') &&\n            server.hasOwnProperty('url')) {\n          utils.deprecated('RTCIceServer.url', 'RTCIceServer.urls');\n          server = JSON.parse(JSON.stringify(server));\n          server.urls = server.url;\n          delete server.url;\n          newIceServers.push(server);\n        } else {\n          newIceServers.push(pcConfig.iceServers[i]);\n        }\n      }\n      pcConfig.iceServers = newIceServers;\n    }\n    return new OrigPeerConnection(pcConfig, pcConstraints);\n  };\n  window.RTCPeerConnection.prototype = OrigPeerConnection.prototype;\n  // wrap static methods. Currently just generateCertificate.\n  if ('generateCertificate' in window.RTCPeerConnection) {\n    Object.defineProperty(window.RTCPeerConnection, 'generateCertificate', {\n      get() {\n        return OrigPeerConnection.generateCertificate;\n      }\n    });\n  }\n}\n\nexport function shimTrackEventTransceiver(window) {\n  // Add event.transceiver member over deprecated event.receiver\n  if (typeof window === 'object' && window.RTCPeerConnection &&\n      ('receiver' in window.RTCTrackEvent.prototype) &&\n      // can't check 'transceiver' in window.RTCTrackEvent.prototype, as it is\n      // defined for some reason even when window.RTCTransceiver is not.\n      !window.RTCTransceiver) {\n    Object.defineProperty(window.RTCTrackEvent.prototype, 'transceiver', {\n      get() {\n        return {receiver: this.receiver};\n      }\n    });\n  }\n}\n\nexport function shimCreateOfferLegacy(window) {\n  const origCreateOffer = window.RTCPeerConnection.prototype.createOffer;\n  window.RTCPeerConnection.prototype.createOffer = function(offerOptions) {\n    if (offerOptions) {\n      if (typeof offerOptions.offerToReceiveAudio !== 'undefined') {\n        // support bit values\n        offerOptions.offerToReceiveAudio = !!offerOptions.offerToReceiveAudio;\n      }\n      const audioTransceiver = this.getTransceivers().find(transceiver =>\n        transceiver.sender.track &&\n        transceiver.sender.track.kind === 'audio');\n      if (offerOptions.offerToReceiveAudio === false && audioTransceiver) {\n        if (audioTransceiver.direction === 'sendrecv') {\n          if (audioTransceiver.setDirection) {\n            audioTransceiver.setDirection('sendonly');\n          } else {\n            audioTransceiver.direction = 'sendonly';\n          }\n        } else if (audioTransceiver.direction === 'recvonly') {\n          if (audioTransceiver.setDirection) {\n            audioTransceiver.setDirection('inactive');\n          } else {\n            audioTransceiver.direction = 'inactive';\n          }\n        }\n      } else if (offerOptions.offerToReceiveAudio === true &&\n          !audioTransceiver) {\n        this.addTransceiver('audio');\n      }\n\n      if (typeof offerOptions.offerToReceiveVideo !== 'undefined') {\n        // support bit values\n        offerOptions.offerToReceiveVideo = !!offerOptions.offerToReceiveVideo;\n      }\n      const videoTransceiver = this.getTransceivers().find(transceiver =>\n        transceiver.sender.track &&\n        transceiver.sender.track.kind === 'video');\n      if (offerOptions.offerToReceiveVideo === false && videoTransceiver) {\n        if (videoTransceiver.direction === 'sendrecv') {\n          if (videoTransceiver.setDirection) {\n            videoTransceiver.setDirection('sendonly');\n          } else {\n            videoTransceiver.direction = 'sendonly';\n          }\n        } else if (videoTransceiver.direction === 'recvonly') {\n          if (videoTransceiver.setDirection) {\n            videoTransceiver.setDirection('inactive');\n          } else {\n            videoTransceiver.direction = 'inactive';\n          }\n        }\n      } else if (offerOptions.offerToReceiveVideo === true &&\n          !videoTransceiver) {\n        this.addTransceiver('video');\n      }\n    }\n    return origCreateOffer.apply(this, arguments);\n  };\n}\n","/*\n *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\n\nimport SDPUtils from 'sdp';\nimport * as utils from './utils';\n\nexport function shimRTCIceCandidate(window) {\n  // foundation is arbitrarily chosen as an indicator for full support for\n  // https://w3c.github.io/webrtc-pc/#rtcicecandidate-interface\n  if (!window.RTCIceCandidate || (window.RTCIceCandidate && 'foundation' in\n      window.RTCIceCandidate.prototype)) {\n    return;\n  }\n\n  const NativeRTCIceCandidate = window.RTCIceCandidate;\n  window.RTCIceCandidate = function(args) {\n    // Remove the a= which shouldn't be part of the candidate string.\n    if (typeof args === 'object' && args.candidate &&\n        args.candidate.indexOf('a=') === 0) {\n      args = JSON.parse(JSON.stringify(args));\n      args.candidate = args.candidate.substr(2);\n    }\n\n    if (args.candidate && args.candidate.length) {\n      // Augment the native candidate with the parsed fields.\n      const nativeCandidate = new NativeRTCIceCandidate(args);\n      const parsedCandidate = SDPUtils.parseCandidate(args.candidate);\n      const augmentedCandidate = Object.assign(nativeCandidate,\n          parsedCandidate);\n\n      // Add a serializer that does not serialize the extra attributes.\n      augmentedCandidate.toJSON = function() {\n        return {\n          candidate: augmentedCandidate.candidate,\n          sdpMid: augmentedCandidate.sdpMid,\n          sdpMLineIndex: augmentedCandidate.sdpMLineIndex,\n          usernameFragment: augmentedCandidate.usernameFragment,\n        };\n      };\n      return augmentedCandidate;\n    }\n    return new NativeRTCIceCandidate(args);\n  };\n  window.RTCIceCandidate.prototype = NativeRTCIceCandidate.prototype;\n\n  // Hook up the augmented candidate in onicecandidate and\n  // addEventListener('icecandidate', ...)\n  utils.wrapPeerConnectionEvent(window, 'icecandidate', e => {\n    if (e.candidate) {\n      Object.defineProperty(e, 'candidate', {\n        value: new window.RTCIceCandidate(e.candidate),\n        writable: 'false'\n      });\n    }\n    return e;\n  });\n}\n\nexport function shimMaxMessageSize(window) {\n  if (window.RTCSctpTransport || !window.RTCPeerConnection) {\n    return;\n  }\n  const browserDetails = utils.detectBrowser(window);\n\n  if (!('sctp' in window.RTCPeerConnection.prototype)) {\n    Object.defineProperty(window.RTCPeerConnection.prototype, 'sctp', {\n      get() {\n        return typeof this._sctp === 'undefined' ? null : this._sctp;\n      }\n    });\n  }\n\n  const sctpInDescription = function(description) {\n    const sections = SDPUtils.splitSections(description.sdp);\n    sections.shift();\n    return sections.some(mediaSection => {\n      const mLine = SDPUtils.parseMLine(mediaSection);\n      return mLine && mLine.kind === 'application'\n          && mLine.protocol.indexOf('SCTP') !== -1;\n    });\n  };\n\n  const getRemoteFirefoxVersion = function(description) {\n    // TODO: Is there a better solution for detecting Firefox?\n    const match = description.sdp.match(/mozilla...THIS_IS_SDPARTA-(\\d+)/);\n    if (match === null || match.length < 2) {\n      return -1;\n    }\n    const version = parseInt(match[1], 10);\n    // Test for NaN (yes, this is ugly)\n    return version !== version ? -1 : version;\n  };\n\n  const getCanSendMaxMessageSize = function(remoteIsFirefox) {\n    // Every implementation we know can send at least 64 KiB.\n    // Note: Although Chrome is technically able to send up to 256 KiB, the\n    //       data does not reach the other peer reliably.\n    //       See: https://bugs.chromium.org/p/webrtc/issues/detail?id=8419\n    let canSendMaxMessageSize = 65536;\n    if (browserDetails.browser === 'firefox') {\n      if (browserDetails.version < 57) {\n        if (remoteIsFirefox === -1) {\n          // FF < 57 will send in 16 KiB chunks using the deprecated PPID\n          // fragmentation.\n          canSendMaxMessageSize = 16384;\n        } else {\n          // However, other FF (and RAWRTC) can reassemble PPID-fragmented\n          // messages. Thus, supporting ~2 GiB when sending.\n          canSendMaxMessageSize = 2147483637;\n        }\n      } else if (browserDetails.version < 60) {\n        // Currently, all FF >= 57 will reset the remote maximum message size\n        // to the default value when a data channel is created at a later\n        // stage. :(\n        // See: https://bugzilla.mozilla.org/show_bug.cgi?id=1426831\n        canSendMaxMessageSize =\n          browserDetails.version === 57 ? 65535 : 65536;\n      } else {\n        // FF >= 60 supports sending ~2 GiB\n        canSendMaxMessageSize = 2147483637;\n      }\n    }\n    return canSendMaxMessageSize;\n  };\n\n  const getMaxMessageSize = function(description, remoteIsFirefox) {\n    // Note: 65536 bytes is the default value from the SDP spec. Also,\n    //       every implementation we know supports receiving 65536 bytes.\n    let maxMessageSize = 65536;\n\n    // FF 57 has a slightly incorrect default remote max message size, so\n    // we need to adjust it here to avoid a failure when sending.\n    // See: https://bugzilla.mozilla.org/show_bug.cgi?id=1425697\n    if (browserDetails.browser === 'firefox'\n         && browserDetails.version === 57) {\n      maxMessageSize = 65535;\n    }\n\n    const match = SDPUtils.matchPrefix(description.sdp,\n      'a=max-message-size:');\n    if (match.length > 0) {\n      maxMessageSize = parseInt(match[0].substr(19), 10);\n    } else if (browserDetails.browser === 'firefox' &&\n                remoteIsFirefox !== -1) {\n      // If the maximum message size is not present in the remote SDP and\n      // both local and remote are Firefox, the remote peer can receive\n      // ~2 GiB.\n      maxMessageSize = 2147483637;\n    }\n    return maxMessageSize;\n  };\n\n  const origSetRemoteDescription =\n      window.RTCPeerConnection.prototype.setRemoteDescription;\n  window.RTCPeerConnection.prototype.setRemoteDescription = function() {\n    this._sctp = null;\n\n    if (sctpInDescription(arguments[0])) {\n      // Check if the remote is FF.\n      const isFirefox = getRemoteFirefoxVersion(arguments[0]);\n\n      // Get the maximum message size the local peer is capable of sending\n      const canSendMMS = getCanSendMaxMessageSize(isFirefox);\n\n      // Get the maximum message size of the remote peer.\n      const remoteMMS = getMaxMessageSize(arguments[0], isFirefox);\n\n      // Determine final maximum message size\n      let maxMessageSize;\n      if (canSendMMS === 0 && remoteMMS === 0) {\n        maxMessageSize = Number.POSITIVE_INFINITY;\n      } else if (canSendMMS === 0 || remoteMMS === 0) {\n        maxMessageSize = Math.max(canSendMMS, remoteMMS);\n      } else {\n        maxMessageSize = Math.min(canSendMMS, remoteMMS);\n      }\n\n      // Create a dummy RTCSctpTransport object and the 'maxMessageSize'\n      // attribute.\n      const sctp = {};\n      Object.defineProperty(sctp, 'maxMessageSize', {\n        get() {\n          return maxMessageSize;\n        }\n      });\n      this._sctp = sctp;\n    }\n\n    return origSetRemoteDescription.apply(this, arguments);\n  };\n}\n\nexport function shimSendThrowTypeError(window) {\n  if (!(window.RTCPeerConnection &&\n      'createDataChannel' in window.RTCPeerConnection.prototype)) {\n    return;\n  }\n\n  // Note: Although Firefox >= 57 has a native implementation, the maximum\n  //       message size can be reset for all data channels at a later stage.\n  //       See: https://bugzilla.mozilla.org/show_bug.cgi?id=1426831\n\n  function wrapDcSend(dc, pc) {\n    const origDataChannelSend = dc.send;\n    dc.send = function() {\n      const data = arguments[0];\n      const length = data.length || data.size || data.byteLength;\n      if (dc.readyState === 'open' &&\n          pc.sctp && length > pc.sctp.maxMessageSize) {\n        throw new TypeError('Message too large (can send a maximum of ' +\n          pc.sctp.maxMessageSize + ' bytes)');\n      }\n      return origDataChannelSend.apply(dc, arguments);\n    };\n  }\n  const origCreateDataChannel =\n    window.RTCPeerConnection.prototype.createDataChannel;\n  window.RTCPeerConnection.prototype.createDataChannel = function() {\n    const dataChannel = origCreateDataChannel.apply(this, arguments);\n    wrapDcSend(dataChannel, this);\n    return dataChannel;\n  };\n  utils.wrapPeerConnectionEvent(window, 'datachannel', e => {\n    wrapDcSend(e.channel, e.target);\n    return e;\n  });\n}\n\n\n/* shims RTCConnectionState by pretending it is the same as iceConnectionState.\n * See https://bugs.chromium.org/p/webrtc/issues/detail?id=6145#c12\n * for why this is a valid hack in Chrome. In Firefox it is slightly incorrect\n * since DTLS failures would be hidden. See\n * https://bugzilla.mozilla.org/show_bug.cgi?id=1265827\n * for the Firefox tracking bug.\n */\nexport function shimConnectionState(window) {\n  if (!window.RTCPeerConnection ||\n      'connectionState' in window.RTCPeerConnection.prototype) {\n    return;\n  }\n  const proto = window.RTCPeerConnection.prototype;\n  Object.defineProperty(proto, 'connectionState', {\n    get() {\n      return {\n        completed: 'connected',\n        checking: 'connecting'\n      }[this.iceConnectionState] || this.iceConnectionState;\n    },\n    enumerable: true,\n    configurable: true\n  });\n  Object.defineProperty(proto, 'onconnectionstatechange', {\n    get() {\n      return this._onconnectionstatechange || null;\n    },\n    set(cb) {\n      if (this._onconnectionstatechange) {\n        this.removeEventListener('connectionstatechange',\n            this._onconnectionstatechange);\n        delete this._onconnectionstatechange;\n      }\n      if (cb) {\n        this.addEventListener('connectionstatechange',\n            this._onconnectionstatechange = cb);\n      }\n    },\n    enumerable: true,\n    configurable: true\n  });\n\n  ['setLocalDescription', 'setRemoteDescription'].forEach((method) => {\n    const origMethod = proto[method];\n    proto[method] = function() {\n      if (!this._connectionstatechangepoly) {\n        this._connectionstatechangepoly = e => {\n          const pc = e.target;\n          if (pc._lastConnectionState !== pc.connectionState) {\n            pc._lastConnectionState = pc.connectionState;\n            const newEvent = new Event('connectionstatechange', e);\n            pc.dispatchEvent(newEvent);\n          }\n          return e;\n        };\n        this.addEventListener('iceconnectionstatechange',\n          this._connectionstatechangepoly);\n      }\n      return origMethod.apply(this, arguments);\n    };\n  });\n}\n\nexport function removeAllowExtmapMixed(window) {\n  /* remove a=extmap-allow-mixed for Chrome < M71 */\n  if (!window.RTCPeerConnection) {\n    return;\n  }\n  const browserDetails = utils.detectBrowser(window);\n  if (browserDetails.browser === 'chrome' && browserDetails.version >= 71) {\n    return;\n  }\n  const nativeSRD = window.RTCPeerConnection.prototype.setRemoteDescription;\n  window.RTCPeerConnection.prototype.setRemoteDescription = function(desc) {\n    if (desc && desc.sdp && desc.sdp.indexOf('\\na=extmap-allow-mixed') !== -1) {\n      desc.sdp = desc.sdp.split('\\n').filter((line) => {\n        return line.trim() !== 'a=extmap-allow-mixed';\n      }).join('\\n');\n    }\n    return nativeSRD.apply(this, arguments);\n  };\n}\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\nimport * as utils from './utils';\n\n  // Browser shims.\nimport * as chromeShim from './chrome/chrome_shim';\nimport * as edgeShim from './edge/edge_shim';\nimport * as firefoxShim from './firefox/firefox_shim';\nimport * as safariShim from './safari/safari_shim';\nimport * as commonShim from './common_shim';\n\n// Shimming starts here.\nexport function adapterFactory({window} = {}, options = {\n  shimChrome: true,\n  shimFirefox: true,\n  shimEdge: true,\n  shimSafari: true,\n}) {\n  // Utils.\n  const logging = utils.log;\n  const browserDetails = utils.detectBrowser(window);\n\n  const adapter = {\n    browserDetails,\n    commonShim,\n    extractVersion: utils.extractVersion,\n    disableLog: utils.disableLog,\n    disableWarnings: utils.disableWarnings\n  };\n\n  // Shim browser if found.\n  switch (browserDetails.browser) {\n    case 'chrome':\n      if (!chromeShim || !chromeShim.shimPeerConnection ||\n          !options.shimChrome) {\n        logging('Chrome shim is not included in this adapter release.');\n        return adapter;\n      }\n      logging('adapter.js shimming chrome.');\n      // Export to the adapter global object visible in the browser.\n      adapter.browserShim = chromeShim;\n\n      chromeShim.shimGetUserMedia(window);\n      chromeShim.shimMediaStream(window);\n      chromeShim.shimPeerConnection(window);\n      chromeShim.shimOnTrack(window);\n      chromeShim.shimAddTrackRemoveTrack(window);\n      chromeShim.shimGetSendersWithDtmf(window);\n      chromeShim.shimSenderReceiverGetStats(window);\n      chromeShim.fixNegotiationNeeded(window);\n\n      commonShim.shimRTCIceCandidate(window);\n      commonShim.shimConnectionState(window);\n      commonShim.shimMaxMessageSize(window);\n      commonShim.shimSendThrowTypeError(window);\n      commonShim.removeAllowExtmapMixed(window);\n      break;\n    case 'firefox':\n      if (!firefoxShim || !firefoxShim.shimPeerConnection ||\n          !options.shimFirefox) {\n        logging('Firefox shim is not included in this adapter release.');\n        return adapter;\n      }\n      logging('adapter.js shimming firefox.');\n      // Export to the adapter global object visible in the browser.\n      adapter.browserShim = firefoxShim;\n\n      firefoxShim.shimGetUserMedia(window);\n      firefoxShim.shimPeerConnection(window);\n      firefoxShim.shimOnTrack(window);\n      firefoxShim.shimRemoveStream(window);\n      firefoxShim.shimSenderGetStats(window);\n      firefoxShim.shimReceiverGetStats(window);\n      firefoxShim.shimRTCDataChannel(window);\n\n      commonShim.shimRTCIceCandidate(window);\n      commonShim.shimConnectionState(window);\n      commonShim.shimMaxMessageSize(window);\n      commonShim.shimSendThrowTypeError(window);\n      break;\n    case 'edge':\n      if (!edgeShim || !edgeShim.shimPeerConnection || !options.shimEdge) {\n        logging('MS edge shim is not included in this adapter release.');\n        return adapter;\n      }\n      logging('adapter.js shimming edge.');\n      // Export to the adapter global object visible in the browser.\n      adapter.browserShim = edgeShim;\n\n      edgeShim.shimGetUserMedia(window);\n      edgeShim.shimGetDisplayMedia(window);\n      edgeShim.shimPeerConnection(window);\n      edgeShim.shimReplaceTrack(window);\n\n      // the edge shim implements the full RTCIceCandidate object.\n\n      commonShim.shimMaxMessageSize(window);\n      commonShim.shimSendThrowTypeError(window);\n      break;\n    case 'safari':\n      if (!safariShim || !options.shimSafari) {\n        logging('Safari shim is not included in this adapter release.');\n        return adapter;\n      }\n      logging('adapter.js shimming safari.');\n      // Export to the adapter global object visible in the browser.\n      adapter.browserShim = safariShim;\n\n      safariShim.shimRTCIceServerUrls(window);\n      safariShim.shimCreateOfferLegacy(window);\n      safariShim.shimCallbacksAPI(window);\n      safariShim.shimLocalStreamsAPI(window);\n      safariShim.shimRemoteStreamsAPI(window);\n      safariShim.shimTrackEventTransceiver(window);\n      safariShim.shimGetUserMedia(window);\n\n      commonShim.shimRTCIceCandidate(window);\n      commonShim.shimMaxMessageSize(window);\n      commonShim.shimSendThrowTypeError(window);\n      commonShim.removeAllowExtmapMixed(window);\n      break;\n    default:\n      logging('Unsupported browser!');\n      break;\n  }\n\n  return adapter;\n}\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n\n'use strict';\n\nimport {adapterFactory} from './adapter_factory.js';\n\nconst adapter = adapterFactory({window});\nexport default adapter;\n","var render = function() {\n  var _vm = this\n  var _h = _vm.$createElement\n  var _c = _vm._self._c || _h\n  return _vm._m(0)\n}\nvar staticRenderFns = [\n  function() {\n    var _vm = this\n    var _h = _vm.$createElement\n    var _c = _vm._self._c || _h\n    return _c(\n      \"div\",\n      { staticClass: \"viewport scanner\", attrs: { id: \"interactive\" } },\n      [_c(\"video\"), _vm._v(\" \"), _c(\"canvas\", { staticClass: \"drawingBuffer\" })]\n    )\n  }\n]\nrender._withStripped = true\n\nexport { render, staticRenderFns }","<template>\n  <div id=\"interactive\" class=\"viewport scanner\">\n    <video />\n    <canvas class=\"drawingBuffer\" />\n  </div>\n</template>\n\n<script>\nimport Quagga from 'quagga';\n\nexport default {\n  name: 'QuaggaScanner',\n  props: {\n    onDetected: {\n      type: Function,\n      default(result) {\n        console.log('detected: ', result);\n      },\n    },\n    onProcessed: {\n      type: Function,\n      default(result) {\n        let drawingCtx = Quagga.canvas.ctx.overlay;\n\n        let drawingCanvas = Quagga.canvas.dom.overlay;\n\n        if (result) {\n          if (result.boxes) {\n            drawingCtx.clearRect(\n              0,\n              0,\n              parseInt(drawingCanvas.getAttribute('width')),\n              parseInt(drawingCanvas.getAttribute('height'))\n            );\n            result.boxes\n              .filter(function(box) {\n                return box !== result.box;\n              })\n              .forEach(function(box) {\n                Quagga.ImageDebug.drawPath(box, { x: 0, y: 1 }, drawingCtx, {\n                  color: 'green',\n                  lineWidth: 2,\n                });\n              });\n          }\n          if (result.box) {\n            Quagga.ImageDebug.drawPath(result.box, { x: 0, y: 1 }, drawingCtx, {\n              color: '#00F',\n              lineWidth: 2,\n            });\n          }\n\n          if (result.codeResult && result.codeResult.code) {\n            Quagga.ImageDebug.drawPath(\n              result.line,\n              { x: 'x', y: 'y' },\n              drawingCtx,\n              { color: 'red', lineWidth: 3 }\n            );\n          }\n        }\n      },\n    },\n    readerTypes: {\n      type: Array,\n      default: () => ['code_128_reader'],\n    },\n    readerSize: {\n      type: Object,\n      default: () => ({\n        width: 640,\n        height: 480,\n      }),\n      validator: o =>\n        typeof o.width === 'number' && typeof o.height === 'number',\n    },\n  },\n  data: function() {\n    return {\n      quaggaState: {\n        inputStream: {\n          type: 'LiveStream',\n          constraints: {\n            width: { min: this.readerSize.width },\n            height: { min: this.readerSize.height },\n            facingMode: 'environment',\n            aspectRatio: { min: 1, max: 2 },\n          },\n        },\n        locator: {\n          patchSize: 'medium',\n          halfSample: true,\n        },\n        numOfWorkers: 2,\n        frequency: 10,\n        decoder: {\n          readers: this.readerTypes,\n        },\n        locate: true,\n      },\n    };\n  },\n  mounted: function() {\n    Quagga.init(this.quaggaState, function(err) {\n      if (err) {\n        return console.log(err);\n      }\n      Quagga.start();\n    });\n    Quagga.onDetected(this.onDetected);\n    Quagga.onProcessed(this.onProcessed);\n  },\n  destroyed: function() {\n    Quagga.stop();\n  },\n};\n</script>\n\n<style scoped>\n.viewport {\n  position: relative;\n}\n\n.viewport canvas,\n.viewport video {\n  position: absolute;\n  left: 0;\n  top: 0;\n}\n</style>\n","import mod from \"-!../node_modules/babel-loader/lib/index.js!../node_modules/vue-loader/lib/index.js??vue-loader-options!./Scanner.vue?vue&type=script&lang=js&\"; export default mod; export * from \"-!../node_modules/babel-loader/lib/index.js!../node_modules/vue-loader/lib/index.js??vue-loader-options!./Scanner.vue?vue&type=script&lang=js&\"","/* globals __VUE_SSR_CONTEXT__ */\n\n// IMPORTANT: Do NOT use ES2015 features in this file (except for modules).\n// This module is a runtime utility for cleaner component module output and will\n// be included in the final webpack user bundle.\n\nexport default function normalizeComponent (\n  scriptExports,\n  render,\n  staticRenderFns,\n  functionalTemplate,\n  injectStyles,\n  scopeId,\n  moduleIdentifier, /* server only */\n  shadowMode /* vue-cli only */\n) {\n  // Vue.extend constructor export interop\n  var options = typeof scriptExports === 'function'\n    ? scriptExports.options\n    : scriptExports\n\n  // render functions\n  if (render) {\n    options.render = render\n    options.staticRenderFns = staticRenderFns\n    options._compiled = true\n  }\n\n  // functional template\n  if (functionalTemplate) {\n    options.functional = true\n  }\n\n  // scopedId\n  if (scopeId) {\n    options._scopeId = 'data-v-' + scopeId\n  }\n\n  var hook\n  if (moduleIdentifier) { // server build\n    hook = function (context) {\n      // 2.3 injection\n      context =\n        context || // cached call\n        (this.$vnode && this.$vnode.ssrContext) || // stateful\n        (this.parent && this.parent.$vnode && this.parent.$vnode.ssrContext) // functional\n      // 2.2 with runInNewContext: true\n      if (!context && typeof __VUE_SSR_CONTEXT__ !== 'undefined') {\n        context = __VUE_SSR_CONTEXT__\n      }\n      // inject component styles\n      if (injectStyles) {\n        injectStyles.call(this, context)\n      }\n      // register component module identifier for async chunk inferrence\n      if (context && context._registeredComponents) {\n        context._registeredComponents.add(moduleIdentifier)\n      }\n    }\n    // used by ssr in case component is cached and beforeCreate\n    // never gets called\n    options._ssrRegister = hook\n  } else if (injectStyles) {\n    hook = shadowMode\n      ? function () { injectStyles.call(this, this.$root.$options.shadowRoot) }\n      : injectStyles\n  }\n\n  if (hook) {\n    if (options.functional) {\n      // for template-only hot-reload because in that case the render fn doesn't\n      // go through the normalizer\n      options._injectStyles = hook\n      // register for functioal component in vue file\n      var originalRender = options.render\n      options.render = function renderWithStyleInjection (h, context) {\n        hook.call(context)\n        return originalRender(h, context)\n      }\n    } else {\n      // inject component registration as beforeCreate hook\n      var existing = options.beforeCreate\n      options.beforeCreate = existing\n        ? [].concat(existing, hook)\n        : [hook]\n    }\n  }\n\n  return {\n    exports: scriptExports,\n    options: options\n  }\n}\n","import { render, staticRenderFns } from \"./Scanner.vue?vue&type=template&id=4ebacf15&scoped=true&\"\nimport script from \"./Scanner.vue?vue&type=script&lang=js&\"\nexport * from \"./Scanner.vue?vue&type=script&lang=js&\"\nimport style0 from \"./Scanner.vue?vue&type=style&index=0&id=4ebacf15&scoped=true&lang=css&\"\n\n\n/* normalize component */\nimport normalizer from \"!../node_modules/vue-loader/lib/runtime/componentNormalizer.js\"\nvar component = normalizer(\n  script,\n  render,\n  staticRenderFns,\n  false,\n  null,\n  \"4ebacf15\",\n  null\n  \n)\n\n/* hot reload */\nif (module.hot) {\n  var api = require(\"/Users/shintaro/workspace_js/vuejs/vue-quagga-js/node_modules/vue-hot-reload-api/dist/index.js\")\n  api.install(require('vue'))\n  if (api.compatible) {\n    module.hot.accept()\n    if (!module.hot.data) {\n      api.createRecord('4ebacf15', component.options)\n    } else {\n      api.reload('4ebacf15', component.options)\n    }\n    module.hot.accept(\"./Scanner.vue?vue&type=template&id=4ebacf15&scoped=true&\", function () {\n      api.rerender('4ebacf15', {\n        render: render,\n        staticRenderFns: staticRenderFns\n      })\n    })\n  }\n}\ncomponent.options.__file = \"src/Scanner.vue\"\nexport default component.exports","import 'webrtc-adapter';\nimport Scanner from './Scanner.vue';\n\nexport default {\n  install: function(Vue, options) {\n    Vue.component('v-quagga', Scanner);\n  },\n};\n","/**\n * Translates the list format produced by css-loader into something\n * easier to manipulate.\n */\nexport default function listToStyles (parentId, list) {\n  var styles = []\n  var newStyles = {}\n  for (var i = 0; i < list.length; i++) {\n    var item = list[i]\n    var id = item[0]\n    var css = item[1]\n    var media = item[2]\n    var sourceMap = item[3]\n    var part = {\n      id: parentId + ':' + i,\n      css: css,\n      media: media,\n      sourceMap: sourceMap\n    }\n    if (!newStyles[id]) {\n      styles.push(newStyles[id] = { id: id, parts: [part] })\n    } else {\n      newStyles[id].parts.push(part)\n    }\n  }\n  return styles\n}\n","/*\n  MIT License http://www.opensource.org/licenses/mit-license.php\n  Author Tobias Koppers @sokra\n  Modified by Evan You @yyx990803\n*/\n\nimport listToStyles from './listToStyles'\n\nvar hasDocument = typeof document !== 'undefined'\n\nif (typeof DEBUG !== 'undefined' && DEBUG) {\n  if (!hasDocument) {\n    throw new Error(\n    'vue-style-loader cannot be used in a non-browser environment. ' +\n    \"Use { target: 'node' } in your Webpack config to indicate a server-rendering environment.\"\n  ) }\n}\n\n/*\ntype StyleObject = {\n  id: number;\n  parts: Array<StyleObjectPart>\n}\n\ntype StyleObjectPart = {\n  css: string;\n  media: string;\n  sourceMap: ?string\n}\n*/\n\nvar stylesInDom = {/*\n  [id: number]: {\n    id: number,\n    refs: number,\n    parts: Array<(obj?: StyleObjectPart) => void>\n  }\n*/}\n\nvar head = hasDocument && (document.head || document.getElementsByTagName('head')[0])\nvar singletonElement = null\nvar singletonCounter = 0\nvar isProduction = false\nvar noop = function () {}\nvar options = null\nvar ssrIdKey = 'data-vue-ssr-id'\n\n// Force single-tag solution on IE6-9, which has a hard limit on the # of <style>\n// tags it will allow on a page\nvar isOldIE = typeof navigator !== 'undefined' && /msie [6-9]\\b/.test(navigator.userAgent.toLowerCase())\n\nexport default function addStylesClient (parentId, list, _isProduction, _options) {\n  isProduction = _isProduction\n\n  options = _options || {}\n\n  var styles = listToStyles(parentId, list)\n  addStylesToDom(styles)\n\n  return function update (newList) {\n    var mayRemove = []\n    for (var i = 0; i < styles.length; i++) {\n      var item = styles[i]\n      var domStyle = stylesInDom[item.id]\n      domStyle.refs--\n      mayRemove.push(domStyle)\n    }\n    if (newList) {\n      styles = listToStyles(parentId, newList)\n      addStylesToDom(styles)\n    } else {\n      styles = []\n    }\n    for (var i = 0; i < mayRemove.length; i++) {\n      var domStyle = mayRemove[i]\n      if (domStyle.refs === 0) {\n        for (var j = 0; j < domStyle.parts.length; j++) {\n          domStyle.parts[j]()\n        }\n        delete stylesInDom[domStyle.id]\n      }\n    }\n  }\n}\n\nfunction addStylesToDom (styles /* Array<StyleObject> */) {\n  for (var i = 0; i < styles.length; i++) {\n    var item = styles[i]\n    var domStyle = stylesInDom[item.id]\n    if (domStyle) {\n      domStyle.refs++\n      for (var j = 0; j < domStyle.parts.length; j++) {\n        domStyle.parts[j](item.parts[j])\n      }\n      for (; j < item.parts.length; j++) {\n        domStyle.parts.push(addStyle(item.parts[j]))\n      }\n      if (domStyle.parts.length > item.parts.length) {\n        domStyle.parts.length = item.parts.length\n      }\n    } else {\n      var parts = []\n      for (var j = 0; j < item.parts.length; j++) {\n        parts.push(addStyle(item.parts[j]))\n      }\n      stylesInDom[item.id] = { id: item.id, refs: 1, parts: parts }\n    }\n  }\n}\n\nfunction createStyleElement () {\n  var styleElement = document.createElement('style')\n  styleElement.type = 'text/css'\n  head.appendChild(styleElement)\n  return styleElement\n}\n\nfunction addStyle (obj /* StyleObjectPart */) {\n  var update, remove\n  var styleElement = document.querySelector('style[' + ssrIdKey + '~=\"' + obj.id + '\"]')\n\n  if (styleElement) {\n    if (isProduction) {\n      // has SSR styles and in production mode.\n      // simply do nothing.\n      return noop\n    } else {\n      // has SSR styles but in dev mode.\n      // for some reason Chrome can't handle source map in server-rendered\n      // style tags - source maps in <style> only works if the style tag is\n      // created and inserted dynamically. So we remove the server rendered\n      // styles and inject new ones.\n      styleElement.parentNode.removeChild(styleElement)\n    }\n  }\n\n  if (isOldIE) {\n    // use singleton mode for IE9.\n    var styleIndex = singletonCounter++\n    styleElement = singletonElement || (singletonElement = createStyleElement())\n    update = applyToSingletonTag.bind(null, styleElement, styleIndex, false)\n    remove = applyToSingletonTag.bind(null, styleElement, styleIndex, true)\n  } else {\n    // use multi-style-tag mode in all other cases\n    styleElement = createStyleElement()\n    update = applyToTag.bind(null, styleElement)\n    remove = function () {\n      styleElement.parentNode.removeChild(styleElement)\n    }\n  }\n\n  update(obj)\n\n  return function updateStyle (newObj /* StyleObjectPart */) {\n    if (newObj) {\n      if (newObj.css === obj.css &&\n          newObj.media === obj.media &&\n          newObj.sourceMap === obj.sourceMap) {\n        return\n      }\n      update(obj = newObj)\n    } else {\n      remove()\n    }\n  }\n}\n\nvar replaceText = (function () {\n  var textStore = []\n\n  return function (index, replacement) {\n    textStore[index] = replacement\n    return textStore.filter(Boolean).join('\\n')\n  }\n})()\n\nfunction applyToSingletonTag (styleElement, index, remove, obj) {\n  var css = remove ? '' : obj.css\n\n  if (styleElement.styleSheet) {\n    styleElement.styleSheet.cssText = replaceText(index, css)\n  } else {\n    var cssNode = document.createTextNode(css)\n    var childNodes = styleElement.childNodes\n    if (childNodes[index]) styleElement.removeChild(childNodes[index])\n    if (childNodes.length) {\n      styleElement.insertBefore(cssNode, childNodes[index])\n    } else {\n      styleElement.appendChild(cssNode)\n    }\n  }\n}\n\nfunction applyToTag (styleElement, obj) {\n  var css = obj.css\n  var media = obj.media\n  var sourceMap = obj.sourceMap\n\n  if (media) {\n    styleElement.setAttribute('media', media)\n  }\n  if (options.ssrId) {\n    styleElement.setAttribute(ssrIdKey, obj.id)\n  }\n\n  if (sourceMap) {\n    // https://developer.chrome.com/devtools/docs/javascript-debugging\n    // this makes source maps inside style tags work properly in Chrome\n    css += '\\n/*# sourceURL=' + sourceMap.sources[0] + ' */'\n    // http://stackoverflow.com/a/26603875\n    css += '\\n/*# sourceMappingURL=data:application/json;base64,' + btoa(unescape(encodeURIComponent(JSON.stringify(sourceMap)))) + ' */'\n  }\n\n  if (styleElement.styleSheet) {\n    styleElement.styleSheet.cssText = css\n  } else {\n    while (styleElement.firstChild) {\n      styleElement.removeChild(styleElement.firstChild)\n    }\n    styleElement.appendChild(document.createTextNode(css))\n  }\n}\n"],"sourceRoot":""}
\ No newline at end of file
diff --git a/package.json b/package.json
index b478d2f..1f9298d 100644
--- a/package.json
+++ b/package.json
@@ -3,7 +3,7 @@
   "description": "A Vue.js component, accessing the device camera and allowing users to read barcodes, within the browser",
   "main": "dist/vue-quagga.js",
   "module": "src/index.js",
-  "version": "1.0.8",
+  "version": "1.0.9",
   "author": "Shintaro Tanaka <genaxy@gmail.com>",
   "license": "MIT",
   "scripts": {