linuxaudio.org

On Wed, Mar 14, 2012 at 9:04 AM, Paul Davis  wrote:

quoted text
> On Wed, Mar 14, 2012 at 11:52 AM, Ralf Mardorf

>  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@lists.linuxaudio.org

http://lists.linuxaudio.org/listinfo/linux-audio-user