On Tue, Jul 28, 2015 at 11:15 PM Tanu Kaskinen <tanuk at iki.fi> wrote: > On Wed, Jul 29, 2015, at 08:44, Andrew Kelley wrote: > > Screenshot of problem: http://i.imgur.com/ENpSCoG.png > > I see no problem there. > > I believe by default the PulseAudio JACK Sink and PulseAudio JACK Source > > are switched around. > > > > In PulseAudio lingo, "Sink" means an output device, and "Source" means an > > input device. Yet, the Sink is registered as a readable client and the > > Source is registered as a writable client, which is backwards. > > It's not backwards. Let's say that we have a music player that connects > to pulseaudio. The user wants the audio from the music player to go to > the speakers, and the speakers are under the control of jack. Inside > PulseAudio there needs to be a sink where the music player's playback > stream can connect. When the audio gets from the player to the sink, the > next problem is to get the audio from the sink to the speakers, which > are represented by two input ports in jack. In jack, audio flows from > output ports to input ports, so PulseAudio needs to create two output > ports. So, the audio flow becomes: music player -> (pulseaudio sink -> > jack output ports) -> jack input ports. The part in parentheses > represents the part that the jack sink module in PulseAudio implements. > After squinting my eyes for a few minutes, I see how it is supposed to work, and it makes sense. I apologize for the mistake and taking your time. This code was written many years ago; of course if there was such an obvious problem someone would have seen it and fixed it by now. > > > I think this happened because when you register a port, > > JackPortIsOutput/JackPortIsInput is relative to the server, not the > > client. > > See: > > > https://github.com/jackaudio/example-clients/blob/master/simple_client.c#L121 > > > > Indeed, applications are happily outputting to PulseAudio, but they go > > silent when I turn the JACK server on. This is explained by my hypothesis > > above. > > There is some other explanation for the silence. Do the applications get > automatically moved to the jack sink? This was a good clue, I looked at pavucontrol and switched the applications to the JACK sink and the audio is correctly routed to the speakers. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.freedesktop.org/archives/pulseaudio-discuss/attachments/20150729/b7a93232/attachment.html>
