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""" extract.py |
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Extract CHiME 3 audio segments from continuous audio |
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Usage: |
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extract.py [-f] [-p pad] [-c channel] <segfilenm> <inwavroot> <outwavroot> |
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extract.py --help |
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Options: |
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<segfilenm> Name of the segmentation file |
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<inwavroot> Name of the root dir for the input audio file |
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<outwavroot> Name of the root dir for the output segments |
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-p <pad>, --padding=<pad> padding at start and end in seconds [default: 0] |
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-f, --fullname Use fullname for outfile |
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-c <chan>, --channel=<chan> Recording channel (defaults to all) |
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--help print this help screen |
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""" |
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from __future__ import print_function |
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import json |
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import os |
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import subprocess |
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import argparse |
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import sys |
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def extract(segment, in_root, out_root, padding=0.0, channel=0, fullname=False): |
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"""use sox to extract segment from wav file |
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in_root - root directory for unsegmented audio files |
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out_root - root directory for output audio segments |
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""" |
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infilenm = '{}/{}.CH{}.wav'.format(in_root, segment['wavfile'], channel) |
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if fullname: |
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outtemplate = '{}/{}.{}.{}.{}.{:02d}.{:03d}.ch{}.wav' |
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outfilenm = outtemplate.format(out_root, |
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segment['wavfile'], |
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segment['wsj_name'], |
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segment['environment'], |
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segment['speaker'], |
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segment['repeat'], |
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segment['index'], |
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channel) |
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else: |
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outfilenm = '{}/{}_{}_{}.CH{}.wav'.format(out_root, |
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segment['speaker'], |
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segment['wsj_name'], |
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segment['environment'], |
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channel) |
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subprocess.call(['sox', infilenm, outfilenm, |
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'trim', |
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str(segment['start'] - padding), |
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'=' + str(segment['end'] + padding)]) |
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def to_string(segment): |
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return "{}:{}-{}:{:03d}({:03d})".format(segment['wavfile'], |
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segment['start'], |
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segment['end'], |
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segment['index'], |
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segment['repeat']) |
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def do_extract(seg_filenm, in_root, out_root, |
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padding=0.0, channel=0, fullname=False): |
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""" |
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Extract segments listed in seg file from recording channel, 'channel' |
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""" |
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with open(seg_filenm, 'r') as infile: |
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json_string = infile.read() |
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segments = json.loads(json_string) |
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if not os.path.isdir(out_root): |
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os.makedirs(out_root) |
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print('Extracting audio in channel {}...'.format(channel)) |
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for i, segment in enumerate(segments): |
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sys.stdout.write(' Processing segment {: 5}/{: <5}\r'.format(i+1, len(segments))) |
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sys.stdout.flush() |
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extract(segment, in_root, out_root, padding=padding, |
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channel=channel, fullname=fullname) |
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sys.stdout.write('\n') |
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sys.stdout.flush() |
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def main(): |
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"""Main method called from commandline.""" |
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parser = argparse.ArgumentParser(description='Extract CHiME 3 audio segments from continuous audio.') |
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parser.add_argument('segfilenm', metavar='<segfilenm>', |
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help='Name of the segmentation file', type=str) |
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parser.add_argument('inwavroot', metavar='<inwavroot>', |
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help='Name of the root dir for the input audio file', type=str) |
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parser.add_argument('outwavroot', metavar='<outwavroot>', |
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help='Name of the root dir for the output segments', type=str) |
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parser.add_argument('-p', '--padding', metavar='pad', |
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help='Padding at start and end in seconds [default: 0]', type=float, default=0) |
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parser.add_argument('-f', '--fullname', |
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help='Use fullname for outfile', action='store_true') |
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parser.add_argument('-c', '--channel', metavar='channel', |
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help='Recording channel (defaults to all).', action='append', type=int, default=[]) |
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args = parser.parse_args() |
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segfilenm = args.segfilenm |
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in_root = args.inwavroot |
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out_root = args.outwavroot |
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padding = args.padding |
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fullname = args.fullname |
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channels = args.channel |
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if len(channels) == 0: |
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channels = [0, 1, 2, 3, 4, 5, 6] |
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for channel in channels: |
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do_extract(segfilenm, in_root, out_root, padding, channel, fullname) |
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if __name__ == '__main__': |
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main() |
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