python-audioread 1.0.3-1 / usr / share / doc / python-audioread / examples / decode.py

# This file is part of audioread.
# Copyright 2011, Adrian Sampson.
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
# 
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.

"""Command-line tool to decode audio files to WAV files."""
from __future__ import print_function
import audioread
import sys
import os
import wave
import contextlib

def decode(filename):
    filename = os.path.abspath(os.path.expanduser(filename))
    if not os.path.exists(filename):
        print("File not found.", file=sys.stderr)
        sys.exit(1)

    try:
        with audioread.audio_open(filename) as f:
            print('Input file: %i channels at %i Hz; %.1f seconds.' % \
                  (f.channels, f.samplerate, f.duration),
                  file=sys.stderr)
            print('Backend:', str(type(f).__module__).split('.')[1],
                  file=sys.stderr)

            with contextlib.closing(wave.open(filename + '.wav', 'w')) as of:
                of.setnchannels(f.channels)
                of.setframerate(f.samplerate)
                of.setsampwidth(2)

                for buf in f:
                    of.writeframes(buf)

    except audioread.DecodeError:
        print("File could not be decoded.", file=sys.stderr)
        sys.exit(1)

if __name__ == '__main__':
    decode(sys.argv[1])