How to use the spleeter.audio.adapter.get_default_audio_adapter function in spleeter

def adapter():
    """ Target test audio adapter fixture. """
    return get_default_audio_adapter()

def test_separate(configuration, instruments):
    """ Test separation from raw data. """
    adapter = get_default_audio_adapter()
    waveform, _ = adapter.load(TEST_AUDIO_DESCRIPTOR)
    separator = Separator(configuration)
    prediction = separator.separate(waveform)
    assert len(prediction) == len(instruments)
    for instrument in instruments:
        assert instrument in prediction
    for instrument in instruments:
        track = prediction[instrument]
        assert not (waveform == track).all()
        for compared in instruments:
            if instrument != compared:
                assert not (track == prediction[compared]).all()

def separate_to_file(
            self, audio_descriptor, destination,
            audio_adapter=get_default_audio_adapter(),
            offset=0, duration=600., codec='wav', bitrate='128k',
            filename_format='{filename}/{instrument}.{codec}',
            synchronous=True):
        """ Performs source separation and export result to file using
        given audio adapter.

        Filename format should be a Python formattable string that could use
        following parameters : {instrument}, {filename} and {codec}.

        :param audio_descriptor:    Describe song to separate, used by audio
                                    adapter to retrieve and load audio data,
                                    in case of file based audio adapter, such
                                    descriptor would be a file path.
        :param destination:         Target directory to write output to.
        :param audio_adapter:       (Optional) Audio adapter to use for I/O.
        :param offset:              (Optional) Offset of loaded song.