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data_load.py
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data_load.py
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# -*- coding: utf-8 -*-
# /usr/bin/python2
import glob
import random
import librosa
import numpy as np
from tensorpack.dataflow.base import RNGDataFlow
from tensorpack.dataflow.common import BatchData
from tensorpack.dataflow import PrefetchData
from audio import read_wav, preemphasis, amp2db
from hparam import hparam as hp
from utils import normalize_0_1
class DataFlow(RNGDataFlow):
def __init__(self, data_path, batch_size):
self.batch_size = batch_size
self.wav_files = glob.glob(data_path)
def __call__(self, n_prefetch=1000, n_thread=1):
df = self
df = BatchData(df, self.batch_size)
df = PrefetchData(df, n_prefetch, n_thread)
return df
class Net1DataFlow(DataFlow):
def get_data(self):
while True:
wav_file = random.choice(self.wav_files)
yield get_mfccs_and_phones(wav_file=wav_file)
class Net2DataFlow(DataFlow):
def get_data(self):
while True:
wav_file = random.choice(self.wav_files)
yield get_mfccs_and_spectrogram(wav_file)
def load_data(mode):
wav_files = glob.glob(getattr(hp, mode).data_path)
return wav_files
def wav_random_crop(wav, sr, duration):
assert (wav.ndim <= 2)
target_len = sr * duration
wav_len = wav.shape[-1]
start = np.random.choice(range(np.maximum(1, wav_len - target_len)), 1)[0]
end = start + target_len
if wav.ndim == 1:
wav = wav[start:end]
else:
wav = wav[:, start:end]
return wav
def get_mfccs_and_phones(wav_file, trim=False, random_crop=True):
'''This is applied in `train1` or `test1` phase.
'''
# Load
wav = read_wav(wav_file, sr=hp.default.sr)
mfccs, _, _ = _get_mfcc_and_spec(wav, hp.default.preemphasis, hp.default.n_fft,
hp.default.win_length,
hp.default.hop_length)
# timesteps
num_timesteps = mfccs.shape[0]
# phones (targets)
phn_file = wav_file.replace("WAV.wav", "PHN").replace("wav", "PHN")
phn2idx, idx2phn = load_vocab()
phns = np.zeros(shape=(num_timesteps,))
bnd_list = []
for line in open(phn_file, 'r').read().splitlines():
start_point, _, phn = line.split()
bnd = int(start_point) // hp.default.hop_length
phns[bnd:] = phn2idx[phn]
bnd_list.append(bnd)
# Trim
if trim:
start, end = bnd_list[1], bnd_list[-1]
mfccs = mfccs[start:end]
phns = phns[start:end]
assert (len(mfccs) == len(phns))
# Random crop
n_timesteps = (hp.default.duration * hp.default.sr) // hp.default.hop_length + 1
if random_crop:
start = np.random.choice(range(np.maximum(1, len(mfccs) - n_timesteps)), 1)[0]
end = start + n_timesteps
mfccs = mfccs[start:end]
phns = phns[start:end]
assert (len(mfccs) == len(phns))
# Padding or crop
mfccs = librosa.util.fix_length(mfccs, n_timesteps, axis=0)
phns = librosa.util.fix_length(phns, n_timesteps, axis=0)
return mfccs, phns
def get_mfccs_and_spectrogram(wav_file, trim=True, random_crop=False):
'''This is applied in `train2`, `test2` or `convert` phase.
'''
# Load
wav, _ = librosa.load(wav_file, sr=hp.default.sr)
# Trim
if trim:
wav, _ = librosa.effects.trim(wav, frame_length=hp.default.win_length, hop_length=hp.default.hop_length)
if random_crop:
wav = wav_random_crop(wav, hp.default.sr, hp.default.duration)
# Padding or crop
length = hp.default.sr * hp.default.duration
wav = librosa.util.fix_length(wav, length)
return _get_mfcc_and_spec(wav, hp.default.preemphasis, hp.default.n_fft, hp.default.win_length, hp.default.hop_length)
# TODO refactoring
def _get_mfcc_and_spec(wav, preemphasis_coeff, n_fft, win_length, hop_length):
# Pre-emphasis
y_preem = preemphasis(wav, coeff=preemphasis_coeff)
# Get spectrogram
D = librosa.stft(y=y_preem, n_fft=n_fft, hop_length=hop_length, win_length=win_length)
mag = np.abs(D)
# Get mel-spectrogram
mel_basis = librosa.filters.mel(hp.default.sr, hp.default.n_fft, hp.default.n_mels) # (n_mels, 1+n_fft//2)
mel = np.dot(mel_basis, mag) # (n_mels, t) # mel spectrogram
# Get mfccs, amp to db
mag_db = amp2db(mag)
mel_db = amp2db(mel)
mfccs = np.dot(librosa.filters.dct(hp.default.n_mfcc, mel_db.shape[0]), mel_db)
# Normalization (0 ~ 1)
mag_db = normalize_0_1(mag_db, hp.default.max_db, hp.default.min_db)
mel_db = normalize_0_1(mel_db, hp.default.max_db, hp.default.min_db)
return mfccs.T, mag_db.T, mel_db.T # (t, n_mfccs), (t, 1+n_fft/2), (t, n_mels)
phns = ['h#', 'aa', 'ae', 'ah', 'ao', 'aw', 'ax', 'ax-h', 'axr', 'ay', 'b', 'bcl',
'ch', 'd', 'dcl', 'dh', 'dx', 'eh', 'el', 'em', 'en', 'eng', 'epi',
'er', 'ey', 'f', 'g', 'gcl', 'hh', 'hv', 'ih', 'ix', 'iy', 'jh',
'k', 'kcl', 'l', 'm', 'n', 'ng', 'nx', 'ow', 'oy', 'p', 'pau', 'pcl',
'q', 'r', 's', 'sh', 't', 'tcl', 'th', 'uh', 'uw', 'ux', 'v', 'w', 'y', 'z', 'zh']
def load_vocab():
phn2idx = {phn: idx for idx, phn in enumerate(phns)}
idx2phn = {idx: phn for idx, phn in enumerate(phns)}
return phn2idx, idx2phn