145 lines
4.9 KiB
Python
145 lines
4.9 KiB
Python
# ----------------------------------------------------------------------------
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# pyglet
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# Copyright (c) 2006-2008 Alex Holkner
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# Copyright (c) 2008-2021 pyglet contributors
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in
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# the documentation and/or other materials provided with the
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# distribution.
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# * Neither the name of pyglet nor the names of its
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# contributors may be used to endorse or promote products
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# derived from this software without specific prior written
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# permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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# ----------------------------------------------------------------------------
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"""Decoder for RIFF Wave files, using the standard library wave module.
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"""
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import wave
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from ..exceptions import MediaDecodeException
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from .base import StreamingSource, AudioData, AudioFormat, StaticSource
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from . import MediaEncoder, MediaDecoder
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class WAVEDecodeException(MediaDecodeException):
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pass
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class WaveSource(StreamingSource):
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def __init__(self, filename, file=None):
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if file is None:
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file = open(filename, 'rb')
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self._file = file
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try:
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self._wave = wave.open(file)
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except wave.Error as e:
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raise WAVEDecodeException(e)
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nchannels, sampwidth, framerate, nframes, comptype, compname = self._wave.getparams()
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self.audio_format = AudioFormat(channels=nchannels, sample_size=sampwidth * 8, sample_rate=framerate)
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self._bytes_per_frame = nchannels * sampwidth
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self._duration = nframes / framerate
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self._duration_per_frame = self._duration / nframes
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self._num_frames = nframes
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self._wave.rewind()
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def __del__(self):
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if hasattr(self, '_file'):
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self._file.close()
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def get_audio_data(self, num_bytes, compensation_time=0.0):
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num_frames = max(1, num_bytes // self._bytes_per_frame)
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data = self._wave.readframes(num_frames)
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if not data:
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return None
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timestamp = self._wave.tell() / self.audio_format.sample_rate
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duration = num_frames / self.audio_format.sample_rate
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return AudioData(data, len(data), timestamp, duration, [])
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def seek(self, timestamp):
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timestamp = max(0.0, min(timestamp, self._duration))
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position = int(timestamp / self._duration_per_frame)
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self._wave.setpos(position)
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#########################################
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# Decoder class:
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#########################################
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class WaveDecoder(MediaDecoder):
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def get_file_extensions(self):
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return '.wav', '.wave', '.riff'
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def decode(self, file, filename, streaming=True):
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if streaming:
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return WaveSource(filename, file)
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else:
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return StaticSource(WaveSource(filename, file))
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class WaveEncoder(MediaEncoder):
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def get_file_extensions(self):
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return '.wav', '.wave', '.riff'
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def encode(self, source, file, filename):
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"""Save the Source to disk as a standard RIFF Wave.
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A standard RIFF wave header will be added to the raw PCM
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audio data when it is saved to disk.
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:Parameters:
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`filename` : str
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The file name to save as.
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"""
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source.seek(0)
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wave_writer = wave.open(file, mode='wb')
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wave_writer.setnchannels(source.audio_format.channels)
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wave_writer.setsampwidth(source.audio_format.bytes_per_sample)
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wave_writer.setframerate(source.audio_format.sample_rate)
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# Save the data in 1-second chunks:
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chunksize = source.audio_format.bytes_per_second
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audiodata = source.get_audio_data(chunksize)
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while audiodata:
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wave_writer.writeframes(audiodata.data)
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audiodata = source.get_audio_data(chunksize)
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def get_decoders():
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return [WaveDecoder()]
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def get_encoders():
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return [WaveEncoder()]
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