a) python is most certainly too slow.  even just running a loop of 
csoundPerformKsmps is noticably (i.e. 5-10 times) slower than running a loop 
of csoundPerformBuffer, even without processing any samples in python. 
especially when kr=sr

b) recompiling the orchestra is slow enough (especially when there are 
soundfonts involved) for me to want to avoid it at all costs.  i run csound 
sometimes on a 300Mhz celeron laptop.   

c) fout does the trick, thanks for the offer though.

On Friday 04 April 2008 00:51, Michael Gogins wrote:
> Python probably isn't too slow for this. You don't need the host IO calls
> either. Just get the samples from the spout buffer and stream them to your
> own soundfile. That means calling csoundPerformKsmps do compute one spout
> buffer at a time. There is a Python wrapper for libsndfile in the CsoundAC
> module you can use to write your output. If the Python access to spout
> doesn't work, let me know and I will make it work.
>
> Perhaps more to the point, Csound can recompile the orchestra and re-create
> the soundfile plenty fast -- usually in a few seconds or less. Loading
> soundfonts, samples, or VST plugins slows it down somewhat but it is still
> tolerable (to me, anyway).
>
> Regards,
> Mike
>
> ----- Original Message -----
> From: "Lilith Bryant" <dark141@gmail.com>
> To: <csound@lists.bath.ac.uk>
> Sent: Wednesday, April 02, 2008 11:10 PM
> Subject: [Csnd] CSound (Python) API & Output Buffers
>
> >I wonder if I could tap the list here for some advice.
> >
> > I'm writing a score writer front-end in python using the csound API.
> >
> > The big idea with this project, is to be able to quickly change the score
> > and
> > re-render with having csound reload the whole orchestra/csd file for
> > every simple score change.  So i'm simply calling the csoundCompile and
> > all the prequisites once at the beginning of my application (or whenever
> > the user asks to reload the orchestra/csd)
> >
> > Then for each renderering, I call csoundScoreRewind and then
> > csoundScoreEvent
> > for each note.
> >
> > Which works as expected, except the output wav file simply grows with
> > easy pass.  i.e. it  csoundScoreRewind doesn't clear it, like would be
> > useful for
> > this case.
> >
> > Now I can alternatively not use wav file output at all, and use
> > csoundSetHostImplementedAudioIO and manually fish out the samples, and
> > write
> > them to a wav file myself.  But this is python and that hideously slow.
> >
> > So the questions are:
> > 1) Is there a way to restart the wav file output without reloading the
> > orchestra/csd?
> >
> > OR
> >
> > 2) Is there a quick way to fish out the output buffer samples into a
> > python
> > string or array, for writing out to file using the python wav module?
> >
> > The best i have so far is something like:
> >
> > ob=csnd.csoundGetOutputBuffer(self.cs)
> > fa=csnd.floatArray.frompointer(ob)
> > sa=array.Array('h',[0]*buffersize*2)
> > for n in range(buffersize*2):
> > sa[n]=fa[n]*32767
> > wavdata=sa.tostring()
> >
> > which really SUCKS performance-wise (not surprisingly).
> >
> > I don't want to write a C/SWIG function to do just this, since i want to
> > be
> > able to give this to people who aren't up to running compilers.
> >
> >
> > Send bugs reports to this list.
> > To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe
> > csound"
>
> Send bugs reports to this list.
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> csound"