application.py 文件源码

def audio_callback(binsim):
    """ Wrapper for callback to hand over custom data """
    assert isinstance(binsim, BinSim)

    # The pyAudio Callback
    def callback(in_data, frame_count, time_info, status):
        # print("pyAudio callback")

        current_soundfile_list = binsim.oscReceiver.get_sound_file_list()
        if current_soundfile_list:
            binsim.soundHandler.request_new_sound_file(current_soundfile_list)

        # Get sound block. At least one convolver should exist
        binsim.block[:binsim.soundHandler.get_sound_channels(), :] = binsim.soundHandler.buffer_read()

        # Update Filters and run each convolver with the current block
        for n in range(binsim.soundHandler.get_sound_channels()):

            # Get new Filter
            if binsim.oscReceiver.is_filter_update_necessary(n):
                # print('Updating Filter')
                filterValueList = binsim.oscReceiver.get_current_values(n)
                filter = binsim.filterStorage.get_filter(Pose.from_filterValueList(filterValueList))
                binsim.convolvers[n].setIR(filter, callback.config.get('enableCrossfading'))

            left, right = binsim.convolvers[n].process(binsim.block[n, :])

            # Sum results from all convolvers
            if n == 0:
                binsim.result[:, 0] = left
                binsim.result[:, 1] = right
            else:
                binsim.result[:, 0] += left
                binsim.result[:, 1] += right

        # Finally apply Headphone Filter
        if callback.config.get('useHeadphoneFilter') == 'True':
            binsim.result[:, 0], binsim.result[:, 1] = binsim.convolverHP.process(binsim.result)

        # Scale data
        binsim.result *= 1 / float((callback.config.get('maxChannels') + 1) * 2)
        binsim.result *= callback.config.get('loudnessFactor')

        # When the last block is small than the blockSize, this is probably the end of the file.
        # Call pyaudio to stop after this frame
        if binsim.block.size < callback.config.get('blockSize'):
            pyaudio.paContinue = 1

        return (binsim.result[:frame_count].tostring(), pyaudio.paContinue)

    callback.config = binsim.config

    return callback