From 66d8cf8be47bd5151b1b66fe7ce47a1a4c7d7c9f Mon Sep 17 00:00:00 2001
From: Andrew Watts <ahwatts@gmail.com>
Date: Wed, 24 May 2023 15:24:52 -0400
Subject: [PATCH] UB fix.

enum mad_layer has no variant with a discriminator equal to zero. Using
a default-initialized frame in rust causes various problems, including
segfaults and inexplicable EOF errors. Initialize this field to a valid
discriminator.
---
 simplemad_sys/libmad-src/frame.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/simplemad_sys/libmad-src/frame.c b/simplemad_sys/libmad-src/frame.c
index 0cb3d0f..b3656d4 100644
--- a/simplemad_sys/libmad-src/frame.c
+++ b/simplemad_sys/libmad-src/frame.c
@@ -67,7 +67,7 @@ int (*const decoder_table[3])(struct mad_stream *, struct mad_frame *) = {
  */
 void mad_header_init(struct mad_header *header)
 {
-  header->layer          = 0;
+  header->layer          = MAD_LAYER_I;
   header->mode           = 0;
   header->mode_extension = 0;
   header->emphasis       = 0;