[chuck-users] chuck and midi clock (again), ignoreTypes() method

[Stefan Blixt]

I am also interested in this. I have tried to make a homebrewed MIDI clock
to OSC in Java, but find it hard prevent the ChucK application (that
receives my OSC messages) to lose sync if more MIDI messages than the clocks
appear in the midi stream. It would be great to be able to receive 0xf8 in
ChucK apps - I personally don't need other messages like stop/start or
timecode.

/Stefan

On Dec 17, 2007 7:20 PM, Julien Canet <jools at free.fr> wrote:

> Dear All,
>
> I am learning chuck and I've made some scripts for the monome 40h
> interface (if someone wants I can post them).
> I really need to sync my script with another software, using MIDI.
> I saw on the users mailing list (
>
> https://lists.cs.princeton.edu/pipermail/chuck-users/2006-April/000503.html
> ) that midi sync wasn't possible. I didn't really understood why at
> first, because I thought we just have to make a midi input handler
> that waits for MIDI clock messages, just like the example in the
> message :
>
> 0 => int device; // number of the device to open (see: chuck --probe)
> MidiIn min;     // the midi event
> MidiMsg msg;    // the message for retrieving data
> if( !min.open( device ) ) me.exit();    // open the device
>
> spork ~ handleMIDI();
>
> fun void handleMIDI()
> {
>
>   while (1)     {
>        min => now;                 // wait on the event 'min'
>        while( min.recv(msg) )          // get the message(s)
>                {
>         if (msg.data1 == 248)   {      // MIDI Clock
>            // Do clocky stuff, count to 24, determine delta-now, whatever
>         }
>   }
> }
> }
>
> So I wrote a little loop waiting for midi clock message, similar to
> the script above.
> I never received midi clock messages... (I am sure they are sent using
> a MIDI monitor).
> I read on chuck forum that MIDI clock messages were not parsed.
>
> So I had a quick look into Chuck source code and try to found why. I
> said quick look because I do not understand the whole code to 100%,
> I've just tried to find more about these MIDI clock messages.
> I saw that in the midiInputCallback, the midi time code and tick
> messages (and some other midi messages) are ignored depending on some
> RtMidiInData flags : the ignoreFlags, initialized to true (ignoreFlags
> set to 7 in fact) in the constructor.
>
> If these flags are true, the size of the message is set to 0 and it is
> ignored.
>
> I saw that there is a method called RTMidiIn::ignoreTypes that can
> changes these flags.
>
> But my BIG question : how to access this ignoreTypes method in chuck
> language?
>
> I recompiled chuck with ignoreFlags initialized to 0. And now I received
> them...
>
> So what is the problem with the midi clock messages? Why disabling them?
>
> Can the end-user re enable them without recompiling?
>
>
> Thanks and congratulations for chuck, this is really wonderful,
>
> Best regards,
>
> Julien.
> _______________________________________________
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> chuck-users at lists.cs.princeton.edu
> https://lists.cs.princeton.edu/mailman/listinfo/chuck-users
>



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