code: def send_audio(self, left_channel, right_channel):
          
          self.lastaudioframe_left = left_channel
          self.lastaudioframe_right = right_channel
docs: Add the audio samples to the stream. The left and the right
          channel should have the same shape.
  
          :param left_channel: array containing the audio signal.
          :type left_channel: numpy array with shape (k, )
              containing values between -1.0 and 1.0. k can be any integer
          :param right_channel: array containing the audio signal.
          :type right_channel: numpy array with shape (k, )
              containing values between -1.0 and 1.0. k can be any integer