def _get_audio_channels(self, audio_abs_path):
        """
        Parameters
        ----------
        audio_abs_path : str

        Returns
        -------
        channel_num : int
        """
        channel_num = int(
            subprocess.check_output(
                ("""sox --i {} | grep "{}" | awk -F " : " '{{print $2}}'"""
                 ).format(audio_abs_path, "Channels"),
                shell=True, universal_newlines=True).rstrip())
        return channel_num
Parameters
        ----------
        audio_abs_path : str

        Returns
        -------
        channel_num : int