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import os |
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import subprocess |
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import sys |
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import h5py |
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import scipy.io.wavfile |
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from fuel.converters.base import fill_hdf5_file |
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def convert_youtube_audio(directory, output_directory, youtube_id, channels, |
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sample, output_filename=None): |
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"""Converts downloaded YouTube audio to HDF5 format. |
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Requires `ffmpeg` to be installed and available on the command line |
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(i.e. available on your `PATH`). |
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Parameters |
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---------- |
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directory : str |
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Directory in which input files reside. |
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output_directory : str |
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Directory in which to save the converted dataset. |
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youtube_id : str |
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11-character video ID (taken from YouTube URL) |
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channels : int |
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The number of audio channels to use in the PCM Wave file. |
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sample : int |
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The sampling rate to use in Hz, e.g. 44100 or 16000. |
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output_filename : str, optional |
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Name of the saved dataset. If `None` (the default), |
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`youtube_id.hdf5` is used. |
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""" |
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input_file = os.path.join(directory, '{}.m4a'.format(youtube_id)) |
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wav_filename = '{}.wav'.format(youtube_id) |
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wav_file = os.path.join(directory, wav_filename) |
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ffmpeg_not_available = subprocess.call(['ffmpeg', '-version']) |
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if ffmpeg_not_available: |
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raise RuntimeError('conversion requires ffmpeg') |
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subprocess.check_call(['ffmpeg', '-y', '-i', input_file, '-ac', |
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str(channels), '-ar', str(sample), wav_file], |
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stdout=sys.stdout) |
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# Load WAV into array |
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_, data = scipy.io.wavfile.read(wav_file) |
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if data.ndim == 1: |
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data = data[:, None] |
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data = data[None, :] |
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# Store in HDF5 |
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if output_filename is None: |
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output_filename = '{}.hdf5'.format(youtube_id) |
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output_file = os.path.join(output_directory, output_filename) |
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with h5py.File(output_file, 'w') as h5file: |
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fill_hdf5_file(h5file, (('train', 'features', data),)) |
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h5file['features'].dims[0].label = 'batch' |
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h5file['features'].dims[1].label = 'time' |
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h5file['features'].dims[2].label = 'feature' |
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return (output_file,) |
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def fill_subparser(subparser): |
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"""Sets up a subparser to convert YouTube audio files. |
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Adds the compulsory `--youtube-id` flag as well as the optional |
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`sample` and `channels` flags. |
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Parameters |
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---------- |
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subparser : :class:`argparse.ArgumentParser` |
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Subparser handling the `youtube_audio` command. |
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""" |
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subparser.add_argument( |
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'--youtube-id', type=str, required=True, |
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help=("The YouTube ID of the video from which to extract audio, " |
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"usually an 11-character string.") |
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) |
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subparser.add_argument( |
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'--channels', type=int, default=1, |
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help=("The number of audio channels to convert to. The default of 1" |
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"means audio is converted to mono.") |
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) |
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subparser.add_argument( |
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'--sample', type=int, default=16000, |
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help=("The sampling rate in Hz. The default of 16000 is " |
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"significantly downsampled compared to normal WAVE files; " |
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"pass 44100 for the usual sampling rate.") |
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) |
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return convert_youtube_audio |
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mila-udem /
fuel
