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clocks
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clocks


  • Subject: clocks
  • From: Sam Aaron <email@hidden>
  • Date: Mon, 17 Nov 2008 15:53:17 +0100

Hi there,

I have a dream involving clocks; I can't really talk to my wife about it as her eyes tend to glaze over pretty quicksmart... However, this list might provide a more appropriate audience, particularly as I need a little bootstrapping help to get things started. My goals are as follows:

* Have one strongly-timed clock that beats very accurately and calls a particular method on clock ticks. (I'm looking for something more accurate than a thread in a sleep/execute loop).

That's it really.

Now, of course, dreams have no bounds, and eventually I would like to do the following:

* Be able to change the tempo of ticks on the fly (speed it up and slow it down at whim),
* Have similar, concurrent, clocks that are related in tempo by a function (i.e. twice as fast, 1/3 the speed etc.),
* Have the method that is called by a particular clock be able to read a buffer of midi/osc packets in reasonable speed,
* Have the method that is called by a particular clock be able to send midi/osc packets as quickly as possible.


And for the really wild stuff...

* Be able to program it in Ruby (or MacRuby, or in JRuby on the JVM) without affecting performance.

Now, I understand that not all of this may be possible (particularly the last goal) however, I'd like to see how far I can get. I just need some initial directions. For example, the following are possible options:

* code all this in C with core audio clocks and wrap it in Ruby via a foreign function interface,
* write it in objective-c and have it as a stand alone module..
* write it in java calling out to core audio clocks, and call the java from jruby..
* use macruby and get the best of all worlds..


I am very interested in any advice/hints/pointers on which route I should take with this project.

Thanks in advance,

Sam Aaron


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