| 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):
-odac -d
; bus channel
gkfreq chnexport "freq", 3
instr 1
a1 oscil 10000, gkfreq, 1
out a1
endin
f1 0 16384 10 1
; run for 30 secs
i1 0 30
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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