On Wed, Mar 14, 2012 at 9:04 AM, Paul Davis <paul@xxxxxxxxxxxxxxxxxxxxx> wrote: > On Wed, Mar 14, 2012 at 11:52 AM, Ralf Mardorf > <ralf.mardorf@xxxxxxxxxxxxx> wrote: > >> Especially in combination with Jack2's -Xalsarawmidi you'll get zero hw >> MIDI jitter, aka hard real-time. > > I don't know if this is the new code that was added recently. > > If its the old stuff then it absolutely is not zero jitter. You're > confused about the difference between "real time", "low latency" and > "jitter". The whole problem of the old code is that was absolutely > "deliver it as fast as possible" and that is precisely is what causes > jitter. The 'alsarawmidi' slave driver in JACK 2 does not have this problem. It postpones the delivery of events based on the audio buffer size. Back in April, when I requested MIDI latency/jitter test results for the driver, I saw peak jitter results as low as 60 microseconds. The 'seq' and 'raw' drivers attached to the ALSA audio driver still suffer from this problem. -- Devin Anderson surfacepatterns (at) gmail (dot) com blog - http://surfacepatterns.blogspot.com/ synthclone - http://synthclone.googlecode.com/ _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
