20 Mar
2007
20 Mar
'07
5:29 a.m.
Jack O'Quin wrote:
I'm not an expert in python (just started learning
it recently), but
I am fairly sure you will not be able to handle JACK process callbacks
in python because a call to the global garbage collector at that point
will almost certainly blow your realtime deadline, causing JACK to
kick your client out of its realtime processing graph.
I'm pretty sure that's not gonna be a problem. This is a python API to
csound, which is (obviously) written in C. This is from the test.py
included with csound:
csound = csnd.Csound()
csound.Compile('-o', 'dac', 'trapped.csd')
while not csound.PerformBuffer():
pass
csound.Reset()
So basically sound.PerformBuffer() is everything, the rest is just
bookkeeping (which python is great for). So I simply need to spawn that
in a seperate thread with realtime priorities.
Any ideas?
You could code those parts of the program in C or C++
to avoid
memory management in the "harder" realtime portions of your
application. With sufficiently large ringbuffers (or the like), the
other parts can probably be written in python with some higher
latency.
My intial tests shows the python API berforms just as good as tegular
csound, with buffers set to -b32 and -B64
Disclaimer: I am only a beginner python programmer.
Nice language,
however.
It's the nicest :-)
--
peace, love & harmony
Atte
http://www.atte.dk | quintet: http://www.anagrammer.dk
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