import argparse
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import json
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import os
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import numpy as np
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import torchaudio
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import torchaudio.compliance.kaldi as kaldi
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import yaml
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def get_parser():
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parser = argparse.ArgumentParser(
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description="computer global cmvn",
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formatter_class=argparse.ArgumentDefaultsHelpFormatter,
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)
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parser.add_argument(
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"--dim",
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default=80,
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type=int,
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help="feature dimension",
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)
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parser.add_argument(
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"--wav_path",
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default=False,
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required=True,
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type=str,
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help="the path of wav scps",
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)
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parser.add_argument(
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"--config_file",
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type=str,
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help="the config file for computing cmvn",
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)
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parser.add_argument(
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"--idx",
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default=1,
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required=True,
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type=int,
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help="index",
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)
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return parser
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def compute_fbank(wav_file,
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num_mel_bins=80,
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frame_length=25,
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frame_shift=10,
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dither=0.0,
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resample_rate=16000,
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speed=1.0,
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window_type="hamming"):
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waveform, sample_rate = torchaudio.load(wav_file)
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if resample_rate != sample_rate:
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waveform = torchaudio.transforms.Resample(orig_freq=sample_rate,
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new_freq=resample_rate)(waveform)
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if speed != 1.0:
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waveform, _ = torchaudio.sox_effects.apply_effects_tensor(
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waveform, resample_rate,
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[['speed', str(speed)], ['rate', str(resample_rate)]]
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)
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waveform = waveform * (1 << 15)
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mat = kaldi.fbank(waveform,
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num_mel_bins=num_mel_bins,
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frame_length=frame_length,
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frame_shift=frame_shift,
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dither=dither,
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energy_floor=0.0,
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window_type=window_type,
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sample_frequency=resample_rate)
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return mat.numpy()
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def main():
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parser = get_parser()
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args = parser.parse_args()
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wav_scp_file = os.path.join(args.wav_path, "wav.{}.scp".format(args.idx))
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cmvn_file = os.path.join(args.wav_path, "cmvn.{}.json".format(args.idx))
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mean_stats = np.zeros(args.dim)
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var_stats = np.zeros(args.dim)
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total_frames = 0
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# with ReadHelper('ark:{}'.format(ark_file)) as ark_reader:
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# for key, mat in ark_reader:
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# mean_stats += np.sum(mat, axis=0)
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# var_stats += np.sum(np.square(mat), axis=0)
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# total_frames += mat.shape[0]
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with open(args.config_file) as f:
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configs = yaml.safe_load(f)
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frontend_configs = configs.get("frontend_conf", {})
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num_mel_bins = frontend_configs.get("n_mels", 80)
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frame_length = frontend_configs.get("frame_length", 25)
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frame_shift = frontend_configs.get("frame_shift", 10)
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window_type = frontend_configs.get("window", "hamming")
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resample_rate = frontend_configs.get("fs", 16000)
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assert num_mel_bins == args.dim
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with open(wav_scp_file) as f:
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lines = f.readlines()
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for line in lines:
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_, wav_file = line.strip().split()
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fbank = compute_fbank(wav_file,
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num_mel_bins=args.dim,
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frame_length=frame_length,
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frame_shift=frame_shift,
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resample_rate=resample_rate,
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window_type=window_type)
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mean_stats += np.sum(fbank, axis=0)
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var_stats += np.sum(np.square(fbank), axis=0)
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total_frames += fbank.shape[0]
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cmvn_info = {
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'mean_stats': list(mean_stats.tolist()),
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'var_stats': list(var_stats.tolist()),
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'total_frames': total_frames
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}
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with open(cmvn_file, 'w') as fout:
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fout.write(json.dumps(cmvn_info))
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if __name__ == '__main__':
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main()
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