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December 2007

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2 discussions

chuck and midi clock (again), ignoreTypes() method
by Julien Canet 17 Dec '07

17 Dec '07

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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multi-channel in chuck
by Jeff Smith 14 Dec '07

14 Dec '07

I'm new to Chuck but am beginning to build out a toolset for future compositions. I'm a first year Phd student in computer music @ Stanford. I did my b.s. in computer science long ago... I'm attaching two code examples. The first is a sample for using chuck with 4-channel sound output. The second is a composition that uses this technique. The second example is less a composition, more a proof of concept. From it, I hope to create a fugue of engines (including a lawnmower, blowdryer, xbox360, hedge trimmer, and handmixer, and leafblower) . (If you require concrete sound files let me know). I find most composition by tape is arduous and suffers from too many dependencies among the various tools and iterations of output across those tools. As a contrast, I want to create sound-sculptures -- namely, a discrete entity (e.g. a single chuck program) that requires no pre or post processing. Changes to the entity affect the whole. Extensibility, however, becomes built into the structure. If you review the code, the extension to n-channel will seem reasonably straightforward. Jeff

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