Tanu Kaskinen authored Apr 05, 2021 and PulseAudio Marge Bot committed Apr 05, 2021

The hooks are fired when the preferred device changes. This is useful
for module-stream-restore.

I added new set_preferred_sink/source() functions for firing the hooks.
The functions also log the preferred device changes.

There was already pa_sink_input_set_preferred_sink(), but that had a
side effect of moving the stream, so I needed a new function. Since it
can be confusing when the two similarly named functions should be
called, I added a comment for pa_sink_input_set_preferred_sink() that
explains the different situations.

Part-of: <pulseaudio/pulseaudio!535>