On Fri, 06.02.09 04:35, Lennart Poettering (lennart at poettering.net) wrote: > > On Wed, 28.01.09 13:44, Bastian, Waldo (waldo.bastian at intel.com) wrote: > > > > 2) Add a GStreamer interface for events like this. > > > > > > 3) If a client doesn't handle these request the streams in question > > > should simply be muted/unmuted. > > > > The problem that I see with this approach is that executing the > > policy will have a dependency on the application responding quickly > > enough and behaving properly. What about starting with step 3) -> > > Mute the audio stream and then do step 1) and 2) after that to let > > the application know that it might be a good idea to pause? > > > > I think such approach would also combine better with volume ramping: > > policy engine could fade out the stream before muting it and then > > advice application to pause. Thoughts? > > Yes, I actually thought about this too. I guess PA generally should > not depend on the client's stability to work properly. Hence yes, I > agree that this kind of "synchronous" communication as I originally > suggested above is a bad idea. The server should never have to 'wait' > for a client to make decisions. > > Hence I would simply add a simple, asynchronous notification > system. Something like this: > > <snip> > typedef void (*pa_stream_event_cb_t)(pa_stream *p, const char *event, pa_proplist *proplist, void *userdata); > > void pa_stream_set_event_callback(pa_stream *p, pa_stream_event_cb_t cb, void *userdata); > </snip> I have now implemented this. It's available in git master. I also implemented a little module that will pause/mute all video/music streams as long a s a phone stream is existant. Works quite well. You can test it with this: PULSE_PROP="media.role=music" pacat some-signal.raw And then on another terminal: PULSE_PROP="media.role=phone" pacat some-other-signal.raw And as long as the latter is running the former will be muted. Also, you will see the pause/resume request messages. Lennart -- Lennart Poettering Red Hat, Inc. lennart [at] poettering [dot] net ICQ# 11060553 http://0pointer.net/lennart/ GnuPG 0x1A015CC4
