def get_buffer(self, bytes):
'''Fill and return an OpenAL buffer'''
frames = ctypes.c_uint(bytes / self.bytes_per_frame)
flags = ctypes.c_uint()
buffer = (ctypes.c_byte * bytes)()
audio_buffer_list = AudioBufferList()
audio_buffer_list.mNumberBuffers = 1
audio_buffer_list.mBuffers[0].mNumberChannels = self.channels
audio_buffer_list.mBuffers[0].mDataByteSize = bytes
audio_buffer_list.mBuffers[0].mData = \
ctypes.cast(buffer, ctypes.c_void_p)
result = quicktime.MovieAudioExtractionFillBuffer(
self.extraction_session_ref,
ctypes.byref(frames),
ctypes.byref(audio_buffer_list),
ctypes.byref(flags))
_oscheck(result)
if frames.value == 0:
return None
size = audio_buffer_list.mBuffers[0].mDataByteSize
albuffer = openal.buffer_pool.get(self.time)
al.alBufferData(albuffer, self.format,
audio_buffer_list.mBuffers[0].mData, size,
int(self.sample_rate))
self.time += self.seconds_per_byte * size
return albuffer
def chain(self, this, buffer):
timestamp = buffer.contents.timestamp * 0.000000001
albuffer = openal.buffer_pool.get(timestamp)
size = buffer.contents.size
al.alBufferData(albuffer, self.format,
buffer.contents.data, size,
self.rate)
gst.gst_mini_object_unref(buffer)
self.element._add_buffer(albuffer, size / self.bytes_per_second)
return gstreamer.GST_FLOW_OK