On Thu, September 13, 2012 5:00 pm, Paul Davis wrote: > On Thu, Sep 13, 2012 at 6:51 PM, Len Ovens <len@xxxxxxxxxxxxx> wrote: > >> >> It depends how pulse is set up. If pulse is also connected to the >> internal >> card (that is the internal card is not turned off in pulse) Then the >> pulse >> jacksink/source modules will hold jack to whatever that internal card is >> doing. > > > there is some confusion here. the pulse jacksink/source modules connect > pulse to JACK, not vice-versa. JACK will be using whatever hardware it was > told to use. the only situation in which JACK routes audio via Pulse is if > the user tells JACK to use an ALSA PCM device that is actually a pulse > pseudo-device (eg. "default" on a system set up with Pulse as the > default). If pulse has the module-jack-source loaded, then jack feeds audio to pulse. and if module-jack-sink is loaded then pulse feeds audio to jack. Normally they are both loaded at the same time by module-jackdbus-detect. It is possible to route audio in through one device to jack through pulse and out to another device. Pulse has routing too... much harder to use though. I have a netbook with intel HDA audio. When I use Jack to run it the lowest latency I can get jack to start at is -p128. At that latency the wireless driver causes xruns on a regular basis. I also have an ART USB audio interface. If I have manually unloaded the module-jackdbus-detect module from pulse, The USB audio interface will start with jack with the latency at -p 64 and no xruns. If I reload the same module I can now only start the USB sound at -p 128 and I get the same xruns...on the USB card. now if I configure pulse to ignore the internal sound interface...even with the module-jackdbus-detect module loaded and streaming sound through pulse and then jack... I can start jack at -p 64 with no problem. Pulse does in some cases affect jack. I have repeated this more than once it is always the same. Low latency kernel, jack is starting in RT. In the same way that I do not know the internals of jack, I don't know the internals of pulse. I am sure you know more than I do about both. But it is hard to argue with experimental data. -- Len Ovens www.OvenWerks.net _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
