Subject: Re: [linux-audio-dev] midi events in jack callback (was: Reborn)
From: Tim Goetze (tim_AT_quitte.de)
Date: Mon Aug 19 2002 - 21:52:21 EEST
Martijn Sipkema wrote:
>> This
>> would not help make things simpler. It would also mean that a Sysex
>> or pitch/CC burst routed through can delay MIDI clocks because of the
>> limited bandwidth on the MIDI wire.
>
>Sysex can hurt timing for other events, but that's MIDI. MIDI clock (any
>MIDI realtime message) can interleave other messages. And yes, merging
>MIDI streams is not easy.
The merging itself is not so hard I think. It becomes real hard when
'immediate' writing has already written too many bytes to the card
(or driver) fifo.
>> Thinking about it -- it's hypothetical because we don't have them in
>> Linux yet -- I believe a decent MIDI out handler using a firm timer
>> would be an order of magnitude more complicated than one based on the
>> RTC. Have you coded one yet?
>
>Yes, and it is not that complex I think. Note that this would only have to
>be done
>in a driver process or a user-space sequencer application and not for every
>client
>application.
>
>I'll try to get a version of my MIDI I/O API/framework ready, but it will
>probably still
>take me some time to get finished.
I see. If you're designing it on the premise that we have firm timers
in Linux, it's certainly going to take some time. ;)
Sorry, couldn't resist. Good luck with it.
tim
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