[LAD] ALSA MIDI latency test results are far away from reality

Robin Gareus robin at gareus.org
Wed Jul 14 17:42:53 UTC 2010


On 07/14/2010 06:31 PM, Nedko Arnaudov wrote:
> Robin Gareus <robin-+VlDMftONaMdnm+yROfE0A at public.gmane.org> writes:
> 
>> I was hinting that the audible midi-jitter could be a result of
>> midi-messages getting 'quantizied' to jack-periods.
>>
>> A JACK-MIDI app which does not honor 'jack_midi_event_t->time' but
>> simply processes all queued midi-events on each jack_process_callback()
>> will result in the symptoms you describe (snare & kick on the same
>> beat). One example of such an app is "a2j".
> 
> What version? 

release-4 - the latest on svn://svn.gna.org/svn/a2jmidid

> I can clearly see code that handles this in the current
> version. It is in jack.c, a2j_alsa_output_thread(), lines 385-411

I've just seen that there's git://repo.or.cz/a2jmidid.git and jumped
from release-4 to release-6.

ciao,
robin


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Robin Gareus                           mail: robin at gareus.org
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