On Wed, Mar 14, 2012 at 9:04 AM, Paul Davis <paul@email-addr-hidden> wrote:
> On Wed, Mar 14, 2012 at 11:52 AM, Ralf Mardorf
> <ralf.mardorf@email-addr-hidden-dsl.net> 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@email-addr-hidden http://lists.linuxaudio.org/listinfo/linux-audio-userReceived on Wed Mar 14 20:15:05 2012
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