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"""Generate opus file for testing load functions"""
import argparse
import subprocess
import scipy.io.wavfile
import torch
def _parse_args():
parser = argparse.ArgumentParser(
description='Generate opus files for test'
)
parser.add_argument('--num-channels', required=True, type=int)
parser.add_argument('--compression-level', required=True, type=int, choices=list(range(11)))
parser.add_argument('--bitrate', default='96k')
return parser.parse_args()
def convert_to_opus(
src_path, dst_path,
*, bitrate, compression_level):
"""Convert audio file with `ffmpeg` command."""
command = ['ffmpeg', '-y', '-i', src_path, '-c:a', 'libopus', '-b:a', bitrate]
if compression_level is not None:
command += ['-compression_level', str(compression_level)]
command += [dst_path]
print(' '.join(command))
subprocess.run(command, check=True)
def _generate(num_channels, compression_level, bitrate):
org_path = 'original.wav'
ops_path = f'{bitrate}_{compression_level}_{num_channels}ch.opus'
# Note: ffmpeg forces sample rate 48k Hz for opus https://stackoverflow.com/a/39186779
# 1. generate original wav
data = torch.linspace(-32768, 32767, 32768, dtype=torch.int16).repeat([num_channels, 1]).t()
scipy.io.wavfile.write(org_path, 48000, data.numpy())
# 2. convert to opus
convert_to_opus(org_path, ops_path, bitrate=bitrate, compression_level=compression_level)
def _main():
args = _parse_args()
_generate(args.num_channels, args.compression_level, args.bitrate)
if __name__ == '__main__':
_main()
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