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

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})

def remove_data_dc(data, off):
            if not off:
                off = audioop.avg(data, self.sample_width)
            return audioop.bias(data, self.sample_width, -off)

def remove_data_dc(data, off):
            if not off:
                off = audioop.avg(data, self.sample_width)
            return audioop.bias(data, self.sample_width, -off)

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})

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})