code: def _get_audio_channels(self, audio_abs_path):
          
          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
docs: Parameters
          ----------
          audio_abs_path : str
  
          Returns
          -------
          channel_num : int