How to use the pydub.utils.audioop function in pydub

def max(self):
        return audioop.max(self._data, self.sample_width)

def set_sample_width(self, sample_width):
        if sample_width == self.sample_width:
            return self

        data = self._data

        if self.sample_width == 1:
            data = audioop.bias(data, 1, -128)

        if data:
            data = audioop.lin2lin(data, self.sample_width, sample_width)

        if sample_width == 1:
            data = audioop.bias(data, 1, 128)

        frame_width = self.channels * sample_width
        return self._spawn(data, overrides={'sample_width': sample_width,
                                            'frame_width': frame_width})

"""
    # pydub does not support 24-bit wav files, use wavio when this occurs
    try:
        audiofile = AudioSegment.from_file(filename)

        if limit:
            audiofile = audiofile[:limit * 1000]

        data = np.fromstring(audiofile._data, np.int16)

        channels = []
        for chn in xrange(audiofile.channels):
            channels.append(data[chn::audiofile.channels])

        fs = audiofile.frame_rate
    except audioop.error:
        fs, _, audiofile = wavio.readwav(filename)

        if limit:
            audiofile = audiofile[:limit * 1000]

        audiofile = audiofile.T
        audiofile = audiofile.astype(np.int16)

        channels = []
        for chn in audiofile:
            channels.append(chn)

    return channels, fs

songname, extension = os.path.splitext(os.path.basename(self.filename))

    try:
      audiofile = AudioSegment.from_file(self.filename)

      if limit:
        audiofile = audiofile[:limit * 1000]

      data = np.fromstring(audiofile._data, np.int16)

      channels = []
      for chn in xrange(audiofile.channels):
        channels.append(data[chn::audiofile.channels])

      fs = audiofile.frame_rate
    except audioop.error:
      print('audioop.error')
      pass
        # fs, _, audiofile = wavio.readwav(filename)

        # if limit:
        #     audiofile = audiofile[:limit * 1000]

        # audiofile = audiofile.T
        # audiofile = audiofile.astype(np.int16)

        # channels = []
        # for chn in audiofile:
        #     channels.append(chn)

    return {
      "songname": songname,

"""
    # pydub does not support 24-bit wav files, use wavio when this occurs
    try:
        audiofile = AudioSegment.from_file(filename)

        if limit:
            audiofile = audiofile[:limit * 1000]

        data = np.fromstring(audiofile._data, np.int16)

        channels = []
        for chn in xrange(audiofile.channels):
            channels.append(data[chn::audiofile.channels])

        fs = audiofile.frame_rate
    except audioop.error:
        fs, _, audiofile = wavio.readwav(filename)

        if limit:
            audiofile = audiofile[:limit * 1000]

        audiofile = audiofile.T
        audiofile = audiofile.astype(np.int16)

        channels = []
        for chn in audiofile:
            channels.append(chn)

    return channels, fs

"""
    left_gain - amount of gain to apply to the left channel (in dB)
    right_gain - amount of gain to apply to the right channel (in dB)
    
    note: mono audio segments will be converted to stereo
    """
    if seg.channels == 1:
        left = right = seg
    elif seg.channels == 2:
        left, right = seg.split_to_mono()
    
    l_mult_factor = db_to_float(left_gain)
    r_mult_factor = db_to_float(right_gain)
    
    left_data = audioop.mul(left._data, left.sample_width, l_mult_factor)
    left_data = audioop.tostereo(left_data, left.sample_width, 1, 0)
    
    right_data = audioop.mul(right._data, right.sample_width, r_mult_factor)
    right_data = audioop.tostereo(right_data, right.sample_width, 0, 1)
    
    output = audioop.add(left_data, right_data, seg.sample_width)
    
    return seg._spawn(data=output,
                overrides={'channels': 2,
                           'frame_width': 2 * seg.sample_width})