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