68 lines
2.5 KiB
Python
68 lines
2.5 KiB
Python
#!/usr/bin/env python3
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# -*- coding: UTF-8 -*-
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import os
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import logging
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logger = logging.getLogger(__name__)
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from common.textutil import get_file_b64
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from common.procutil import subproc_succ
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SILK_DECODER = os.path.join(os.path.dirname(__file__),
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'../third-party/silk/decoder')
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if not os.path.exists(SILK_DECODER):
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logger.error("Silk decoder is not compiled. Please see README.md.")
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raise RuntimeError()
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def parse_wechat_audio_file(file_name):
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try:
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return do_parse_wechat_audio_file(file_name)
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except Exception as e:
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logger.error(f"Error when parsing audio file {file_name}: {str(e)}")
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return "", 0
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def do_parse_wechat_audio_file(file_name):
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""" return a mp3 stored in base64 unicode string, and the duration"""
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if not file_name: return "", 0
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mp3_file = os.path.join('/tmp',
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os.path.basename(file_name)[:-4] + '.mp3')
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with open(file_name, 'rb') as f:
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header = f.read(10)
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if b'AMR' in header:
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raise NotImplementedError("AMR decoding not implemented because it seems deprecated since WeChat6.0+")
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# The below is python2 only. It should be equivalent to using sox from command line?
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import pysox
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infile = pysox.CSoxStream(file_name)
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outfile = pysox.CSoxStream(mp3_file, 'w', infile.get_signal())
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chain = pysox.CEffectsChain(infile, outfile)
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chain.flow_effects()
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outfile.close()
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signal = infile.get_signal().get_signalinfo()
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duration = signal['length'] * 1.0 / signal['rate']
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elif b'SILK' in header:
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raw_file = os.path.join('/tmp',
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os.path.basename(file_name)[:-4] + '.raw')
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cmd = '{0} {1} {2}'.format(SILK_DECODER, file_name, raw_file)
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out = subproc_succ(cmd)
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for line in out.split(b'\n'):
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if b'File length' in line:
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duration = float(line[13:-3].strip())
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break
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else:
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raise RuntimeError("Error decoding silk audio file!")
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# TODO don't know how to do this with python
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subproc_succ('sox -r 24000 -e signed -b 16 -c 1 {} {}'.format(raw_file, mp3_file))
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os.unlink(raw_file)
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else:
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raise NotImplementedError("Audio file format cannot be recognized.")
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mp3_string = get_file_b64(mp3_file)
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os.unlink(mp3_file)
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return mp3_string, duration
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if __name__ == '__main__':
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import sys
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fname = sys.argv[1]
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print(parse_wechat_audio_file(fname)[1])
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