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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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