Source code for audiodata.aio.waveio

# -*- coding: UTF-8 -*-
:author:   Nicolas Chazeau, Brigitte Bigi
:summary:  Microsoft WAV support.

.. _This file is part of SPPAS:

     ___   __    __    __    ___
    /     |  \  |  \  |  \  /              the automatic
    \__   |__/  |__/  |___| \__             annotation and
       \  |     |     |   |    \             analysis
    ___/  |     |     |   | ___/              of speech

    Copyright (C) 2011-2021  Brigitte Bigi
    Laboratoire Parole et Langage, Aix-en-Provence, France

    Use of this software is governed by the GNU Public License, version 3.

    SPPAS is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    SPPAS is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with SPPAS. If not, see <>.

    This banner notice must not be removed.



import wave

from sppas.src.config import u

from import sppasAudioPCM

# ---------------------------------------------------------------------------

[docs]class WaveIO(sppasAudioPCM): """A wave file open/save sppasAudioPCM class. Waveform Audio File Format is a Microsoft and IBM audio file format standard for storing an audio bitstream on PCs. It is an application of the Resource Interchange File Format (RIFF) bitstream format method for storing data in "chunks". """
[docs] def __init__(self): """Constructor.""" super(WaveIO, self).__init__()
# -----------------------------------------------------------------------
[docs] def open(self, filename): """Get an audio from a Waveform Audio File Format file. :param filename (str) input file name. """ # Use the standard wave library to load the wave file # open method returns a Wave_read() object self._audio_fp =, "r")
# -----------------------------------------------------------------------
[docs] def save(self, filename): """Write an audio content as a Waveform Audio File Format file. :param filename (str) output filename. """ if self._audio_fp is not None: self.rewind() frames = self._audio_fp.readframes(self._audio_fp.getnframes()) self.save_fragment(filename, frames) elif len(self._channels) == 1: channel = self._channels[0] f = wave.Wave_write(u(filename)) f.setnchannels(1) f.setsampwidth(channel.get_sampwidth()) f.setframerate(channel.get_framerate()) try: f.writeframes(channel.get_frames()) finally: f.close() else: self.verify_channels() sw = self._channels[0].get_sampwidth() frames = b"" for i in range(0, self._channels[0].get_nframes()*sw, sw): for j in range(len(self._channels)): frames += self._channels[j].get_frames(sw) f = wave.Wave_write(u(filename)) f.setnchannels(len(self._channels)) f.setsampwidth(self._channels[0].get_sampwidth()) f.setframerate(self._channels[0].get_framerate()) try: f.writeframes(frames) finally: f.close()
# -----------------------------------------------------------------------
[docs] def save_fragment(self, filename, frames): """Write an audio content as a Waveform Audio File Format file. :param filename: (str) output filename. :param frames: (str) the frames to write """ f = wave.Wave_write(u(filename)) f.setnchannels(self.get_nchannels()) f.setsampwidth(self.get_sampwidth()) f.setframerate(self.get_framerate()) try: f.writeframes(frames) finally: f.close()