Set the callback function that is called whenever the stream is
* moved to a different sink/source. Use pa_stream_get_device_name() or
* pa_stream_get_device_index() to query the new sink/source. This
* notification is only generated when the server is at least
* 0.9.8. \since 0.9.8
Set the callback function that is called whenever the stream is * moved to a different sink/source. Use pa_stream_get_device_name() or * pa_stream_get_device_index() to query the new sink/source. This * notification is only generated when the server is at least * 0.9.8. \since 0.9.8