Re: [seq24-users] Midi Clock Sync patch (slave seq24 to external sequencers)

[Kevin M. <ke...@su...>]

sounds reasonable.   Without looking at the code - I think you're pointing
out that I don't do the "if running" checks.

I can add that.   I will try to get it done within the next week...   Or...
Let me know if you were planning to do it yourself and I'll ignore it. :)
Should be an easy change either way.

---
kevin meinert | http://www.subatomicglue.com


On Thu, Jun 25, 2009 at 12:31 PM, Guido Scholz
<gui...@ba...>wrote:

> Am Tue, 14. Apr 2009 um 21:43:24 -0500 schrieb Kevin Meinert:
>
> > Hello Everyone,
>
> Hi Kevin,
>
> > Attached is a patch to upgrade perform.cpp and perform.h to have the Midi
> > Clock Sync feature.   Test it out and tell me how it goes.
>
> [...]
>
> > documentation:
> > ==============================================================
> > Midi Clock input:
> >
> > seq24 will slave off of incoming MidiClock messages
> > 0xfc 0xfa 0xf8   (start stop and tick)
> >
> > This has been tested with another seq24 instance (stop/start works)
> > This has been tested with a x0xb0x in (start/stop works)
> >
> > It will also pay attention to 0xfb (continue) and 0xf2 (Midi Song Pos)
> but
> > these aren't tested...
>
> I would like to come back to this topic. Some weeks ago I followed a
> discussion on the Linux Audio User (LAU) mailinglist, dealing with MIDI
> clock support:
>
> http://lists.linuxaudio.org/pipermail/linux-audio-user/2009-May/060534.html
>
> Reading our code I found the current implementation in seq24 is not at a
> perfect state. I spend some time to look for an internet resource about
> this topic and found this article, giving some clear statements about
> how a "MIDI clock client" should behave:
>
>  http://home.roadrunner.com/~jgglatt/tech/midispec/seq.htm<http://home.roadrunner.com/%7Ejgglatt/tech/midispec/seq.htm>
>
> The current code is not so far away from the theory, but there are some
> basic differences. As I understand the MIDI events should trigger
> actions like this:
>
> MIDI Start:
>  * Prepare for a start at the very beginning of the song
>  * if running, ignore this event
>
> MIDI Continue:
>  * Prepare for a start at the current position
>  * if running, ignore this event
>
> MIDI Clock:
>  * if not running, start running
>
> MIDI song position:
>  * if running, ignore event else update position
>
> MIDI Stop:
>  * if running, stop else ignore event
>
> Do you agree?
> Guido
>
>
> --
> http://www.bayernline.de/~gscholz/ <http://www.bayernline.de/%7Egscholz/>
> http://www.lug-burghausen.org/
>
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