Adding Ableton Link synchronisation to TempoClock

[smiarx]

I needed support for Ableton Link in Supercollider for a live project. LinkUGen already exists but it only works on the server side, and I usually work with Patterns and Routines. Unfortunately quarks don't allow hard-coded C++ extensions of sclang, so I created a fork implementing it.

It adds some primitives and a method TempoClock.link(state=true) that allow any TempoClock beats and tempo to be synchronized to the current Link sessions. One way to test it is to create a pattern with quant, removing server latency.

t = TempoClock(90/60).link;
Pbind(\degree, Pseq([0,1,2,3],inf), \latency, 0).play(t, quant:4);

This should be synchronized with every other Link application.

It also add the variables TempoClock.numPeers which is set to the number of connected peers in the session, and TempoClock.linkTempoChanged which can be set to a callback function called when the tempo is changed in the session by other users.

Since adding this as a quark is impossible right now, I'd like to know the team opinion on this and if it's worth making a pull request. Many people work with Live and more and more application support Link, I think it would be a great addition to SuperCollider.

[nhthn]

wonderful!! i think this would be a perfectly appropriate feature to introduce to core for SC 3.10.

[telephon]

very nice, yes, please make a pull request! Then we can discuss the details about what the best code interface is.

[brianlheim]

Cool! I also support moving this to core.

[smiarx]

Pull request is here #3351

[brianlheim]

Closed by #4331 , thanks again @smiarx for getting this started!