This is very nice. Thanks.
Oeyvind

2007/1/31, Victor Lazzarini <Victor.Lazzarini@nuim.ie>:
> Following up a recent discussion on the other list, I have added
> a mechanism for using callbacks in Python (as well as C++)
> to the CsoundPerformanceThread class.
>
> Here's a trivial example (I have added this to the sources as well):
>
> import csnd
> import time
>
> # create & compile instance
> cs = csnd.Csound()
> cs.Compile("cb.csd")
>
> # define callback
> def callback(csound):
>     a = csound.GetChannel("freq")
>     if(a < 1000): a = a+0.1
>     else: a = 100.0
>     csound.SetChannel("freq", a)
>
> # set an initial value for freq
> cs.SetChannel("freq", 100)
>
> # create the thread object
> perf = csnd.CsoundPerformanceThread(cs)
>
> # set the callback
> perf.SetProcessCallback(callback, cs)
>
> # play
> perf.Play()
>
> # wait for 30 secs
> time.sleep(30)
>
> ###############
> Here's the CSD (cb.csd):
>
> <CsoundSynthesizer>
> <CsOptions>
> -odac -d
> </CsOptions>
>
> <CsInstruments>
>
> ; bus channel
> gkfreq chnexport "freq", 3
>
> instr 1
>   a1 oscil 10000, gkfreq, 1
>   out a1
> endin
>
> </CsInstruments>
>
> <CsScore>
>
> f1 0 16384 10 1
> ; run for 30 secs
> i1 0 30
>
> </CsScore>
>
> </CsoundSynthesizer>
>
>
>
> NB: The callback is called *before* csoundPerformKsmps() by the
> processing loop.
>
>
>
> Victor Lazzarini
> Music Technology Laboratory
> Music Department
> National University of Ireland, Maynooth
>
>
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