On Wednesday 10 November 2010 05:08:00 torbenh wrote: > On Tue, Nov 09, 2010 at 11:43:09PM -0800, Ken Restivo wrote: > > Question about the alsa_out tool in the JACK github. > > > > How critical is the libresample portion of the code? What would happen if > > I removed it? > > > > i.e. if I were sending, say, one stereo pair to one amp, and another > > stereo pair to a different amp, and didn't care about the word clocks > > being in sync, do I really need that libresample stuff sucking up > > valuable CPU? Or could I whack it? What would be the difficulties > > created by doing that? Again, this'd be only for output channels and I > > wouldn't need the word clocks to be in sync. > > you are confusing things here. > its not about wordclocks being in sync. if your wordclocks are in sync. > you dont need alsa_out. > > but most likely your wordclocks are not in sync. this means your > soundcards run at different drifing samplerates, and one soundcard will > consume a different amount of samples per jack cycle. but jack is > feeding period samples each cycle. > > first try using -q option set to 0 because that will use linear resampling. > reducing the value of the -s option (default 256) will also improve cpu > usage. but might yield worse performance of the algorithm. it depends a bit > on the soundcards you are using. Didn't he mention having one physical soundcard with 4 outs that only presented 2 outs to jack? If so, do any such single physical soundcards actually have two clocks? The alsa-out trick would just get the other two outs on the same card to show in jack. Or is my memory acting up this morning? all the best, drew _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
