What spec/blueprint you want? If you are asking how to resolve problem mentioned in the thread. Pls see below mail:
> Such an "inline" policy request notification subsystem should be > trivial to add. This should probably be extensible so that we can add > further notifications such as keypresses from BT devices or jack > sensing events from the sink. > > 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? Cheers, Waldo >-----Original Message----- >From: [email protected] [mailto:pulseaudio- >[email protected]] On Behalf Of Jason Taylor >Sent: 2009年2月5日 14:33 >To: General PulseAudio Discussion >Subject: Re: [pulseaudio-discuss] why command_cork_playback_stream() will >be invoked many times? > >Is there a spec/blueprint for this some where? > > > > > >-----Original Message----- > >From: [email protected] >[mailto:pulseaudio- > >[email protected]] On Behalf Of Lennart Poettering > >Sent: 2009年1月23日 6:36 > >To: [email protected] > >Subject: Re: [pulseaudio-discuss] why command_cork_playback_stream() >will > >be invoked many times? > > > >On Tue, 20.01.09 10:13, pl bossart ([email protected]) wrote: > > > >> Hi Lennart, > >> Here is the use case Xing is referring to: you are listening to >music, > >and a > >> VoIP call starts. The user may not want to mix the music and the >speech > >> call. > >> > >> So the idea is to pause the music while the call takes place, and >resume > >the > >> music once the call finishes. PulseAudio receives both streams, >and it > >would > >> seem natural to configure said behavior in a PulseAudio module. So >we > >either > >> need the ability to pause a stream within PulseAudio, or we need a >means > >to > >> inform the client they need to pause. > >> > >> I agree with you that pausing may create timing havoc on the >client; but > >we > >> are missing a generic protocol to notify the clients and implement >this > >> legitimate use case. > > > >This issue has come up before. e.g. Nokia folks needs this kind of > >policy enforcing module, too. > > > >Simply pausing client streams without having explicit client support > >for it is not really an option though. So I generally think the way > >forward is like this: > > > >1) Add an API to PA to allow informing clients of policy requests >from the > > server. i.e. add some mechanism so that clients that allocate a > > pa_stream object can set a callback that is called whenever some > > policy engine inside PA wants the client to stop/pause/resume > > playback or has similar requests. It would then be up to the > > client to actually do something about it and then pause the >stream > > and update the UI accordingly. > > > > Such an "inline" policy request notification subsystem should be > > trivial to add. This should probably be extensible so that we can >add > > further notifications such as keypresses from BT devices or jack > > sensing events from the sink. > > > >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. > > > >That's the rough plan I have. Patches always welcome. > > > >Lennart > > > >-- > >Lennart Poettering Red Hat, Inc. > >lennart [at] poettering [dot] net ICQ# 11060553 > >http://0pointer.net/lennart/ GnuPG 0x1A015CC4 > >_______________________________________________ > >pulseaudio-discuss mailing list > >[email protected] > >https://tango.0pointer.de/mailman/listinfo/pulseaudio-discuss > _______________________________________________ > pulseaudio-discuss mailing list > [email protected] > https://tango.0pointer.de/mailman/listinfo/pulseaudio-discuss > > > > > >-- >"A little rudeness and disrespect can elevate a meaningless interaction to >a battle of wills and add drama to an otherwise dull day." - Calven _______________________________________________ pulseaudio-discuss mailing list [email protected] https://tango.0pointer.de/mailman/listinfo/pulseaudio-discuss
