Re: [Jack-Devel] OS X jack midi message issues between jack and core midi

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DateThu, 02 Aug 2012 18:44:18 -0700
From Devin Anderson <[hidden] at gmail dot com>
ToStéphane Letz <[hidden] at grame dot fr>
Cc[hidden] at lists dot jackaudio dot org, [hidden] at yahoogroups dot com
In-Reply-ToStéphane Letz Re: [Jack-Devel] OS X jack midi message issues between jack and core midi
Follow-UpStéphane Letz Re: [Jack-Devel] [jackosx] Re: OS X jack midi message issues between jack and core midi
On Thu, Aug 2, 2012 at 1:54 PM, Stéphane Letz <[hidden]> wrote:

> Le 2 août 2012 à 21:40, Devin Anderson a écrit :
>> I got around to looking at the JACK 2 code on github.com/jackaudio,
>> and I don't see the fix applied for duplicate messages that I sent
>> over.  I think the fix should be applied.
>
> The patch has been applied on my private tree and is part of
> latest JackOSX package, but it does not seem to fix the issue.

I don't think it fixes the *whole* issue.  Note that Iain said:

> - occasional clock messages are either dropped or duplicated
> - if you look at the top of the screen shot, you can see:
> - 24 clock messages per quarter in the jack_midi_dump output
> - a duplicate clock message at 9:38:838 and 9:38:839 in the midi
> monitor
> - when these duplicate messages happen, there is a noticeable
> lurch in the sync with abletone live ( running using jack as audio
> driver )

... referencing both dropped messages and duplicate messages.  I think
that my patch takes care of one possible source of duplicate messages.

> So the issue still seems there...

I assume you've verified that the problem exists, and checked to make
sure that Restart() hasn't been called when messages are dropped.
I'll look elsewhere.

@Iain: Have you checked to see if JACK is outputting any error
messages when MIDI messages are dropped?

-- 
Devin Anderson
surfacepatterns (at) gmail (dot) com

blog - http://surfacepatterns.blogspot.com/
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