Terminate audio processing.

        This waits until all pending audio buffers have been played
        before it returns. If successful, the stream is considered
        inactive.

def stop(self):
        """Terminate audio processing.

        This waits until all pending audio buffers have been played
        before it returns. If successful, the stream is considered
        inactive.

        """
        err = _pa.Pa_StopStream(self._stream)
        if err == _pa.paStreamIsStopped:
            return
        self._handle_error(err)