[chuck-users] how to use MIDI clock in ChucK

[Michael Heuer]

The tempo in BPM is what drives the TimeSignature class in LicK <https://github.com/heuermh/lick/blob/master/lick/duration/TimeSignature.ck>, for example a 4/4 kick drum

RolandTr808 rolandTr808;
TimeSignature.common(120) @=> TimeSignature ts;
ts.quarterProvider() @=> QuarterProvider q;

spork ~ Loops.loop(rolandTr808.kickE, q).run();

// wait a minute, then change the tempo to 110 BPM
1::minute => now;
110 => ts.tempo;

// wait another minute, then decelerate the tempo by 0.8 over the next 30 seconds
1::minute => now;
spork ~ ts.decel(0.8, 30::second);

etc.

If I can calculate the BPM from external clock, then I can adjust the BPM in the TimeSignature class as it is running.

   michael


> On Jul 2, 2019, at 4:37 PM, Mario Buoninfante <mario.buoninfante at gmail.com> wrote:
> 
> about receiving external clock, I think the goal there is to use the clock to drive the algorithm.
> I wouldn't try to calculate the BPM if not for just displaying it somewhere.
> 
> On Tue, 2 Jul 2019 at 22:17, Michael Heuer <heuermh at gmail.com <mailto:heuermh at gmail.com>> wrote:
> All,
> 
> I'm curious how to use MIDI clock effectively in ChucK, in two main use cases:
> 
> From a sample-rate-based timer in ChucK, how should I send out MIDI clock?
> 
> while (true) {
>   10::ms => now;
>   // send MIDI clock
> }
> 
> or
> 
> TimeSignature.common(120) @=> TimeSignature ts;
> 
> while (true) {
>   ts.e => now;
>   // send MIDI clock
> }
> 
> or (this one allows the caller to modify the tempo later)
> 
> TimeSignature.common(120) @=> TimeSignature ts;
> ts.eighthProvider() @=> EighthProvider e;
> 
> while (true) {
>   e.evaluate() => now;
>   // send MIDI clock
> }
> 
> 
> From receiving MIDI clock messages from an external source, how should one adjust the BPM in ChucK?
> 
> MidiIn min;
> MidiMsg msg;
> 
> TimeSignature.common(120) @=> TimeSignature ts;
> 
> while (min.recv(msg)) {
>   // if is clock … {
>     /* new BPM */ => ts.tempo;
>   }
> }
> 
> I would imagine I would want to window over the last n clock messages to average?
> 
> Thanks in advance,
> 
>    michael
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