maybe i should explain what i am trying to do.  i have a concatenative synthesis engine that uses ~40 psychoaucoustic features that matches features extracted from input segments (note onsets) with an existing corpus of sound, finds the closest match and substitutes it into a new sequence.  I am trying to build an evolutionary synthesis engine onto it that will find synth parameters that minimize the distance between segment features and synthesis features.  unfortunately all of my code is in matlab and i dont have time to write a huge collection of synthesis algorithms in matlab along with everything else.  my hope was to use synth-rich csound  as part of my objective function to iteratively generate a segment of sound based on the current parameter set, zip that back into matlab where i could extract features, calculate distance and tweak parameters again... ad inifinitum (heh, hopefully not!).  so, being part of my optimization loop, i just need to specify a single note and have csound generate a buffer of data that i can send back as quickly and noninvasively as possible.  Can this be easily done?

Balan

On Sun, Mar 16, 2008 at 3:39 PM, Michael Gogins <gogins@pipeline.com> wrote:
You might have better luck with Csound::PerformKsmps(). You can use Csound::GetSpoutSize(), or calculate the size yourself as size = sizeof(double) (or sizeof(float)) * nchnls * ksmps. You can access the input buffer as Csound::GetSpin() and the output buffer as Csound::GetSpout().
 
Note that this is the LOW LEVEL buffer, the one opcodes actually write to. Not the intermediate level buffer that is sent to the sound card (that one's computed by PerformBuffer()).
 
Don't ask me why we we have an intermediate level buffer at all, I think it is an unnecessary complication.
 
 
----- Original Message -----
Sent: Sunday, March 16, 2008 6:20 PM
Subject: Re: [Cs-dev] matlab interface

understood, but Csound::GetOutputBufferSize() returns 0 after CppSound::perform() and Csound::PerformBuffer() just hangs.  code attached

// test app for CppSound
#include "CppSound.hpp"

int main(int argc, char* argv[])
{
    // cppsound object
    CppSound* cpps = new CppSound();

    // create score
    cpps->addScoreLine("f 111 0 4096 10 1");
    cpps->addScoreLine("i 100 0 1.0 20000 220 111");
    cpps->addScoreLine("i 100 0 -1");
   
    // create orchestra
    cpps->setOrchestra("instr 100\na1 oscil p4,p5,p6\nout a1\nendin");

    // create csound command with temp orc and score
    cpps->setCommand("csound -RWdfo test.wav ./tempk.orc ./tempk.sco");
   
    // export performance
    cpps->exportForPerformance();
   
    // perform?
    cpps->perform();
    // cpps->PerformBuffer() hangs
    // cpps->Perform() hangs

    // size check (returns a zero size)
    printf("%ld\n",cpps->GetOutputBufferSize());

    // cleanup
    delete cpps;
    return 0;
}

On Sun, Mar 16, 2008 at 2:34 PM, victor <Victor.Lazzarini@nuim.ie> wrote:
Csound::GetOutputBuffer()? CppSound is derived from Csound.
----- Original Message -----
Sent: Sunday, March 16, 2008 9:15 PM
Subject: Re: [Cs-dev] matlab interface

Thanks everyone.  Viktor: your comment made me go back and verify what I was linking against, I had incorrectly built the csnd library.  fixed.
ha!  so my next question is: if I use CppSound::Perform() is there a way to get access to the performance buffer?
again thanks for all of your help and patience.

Balan

On Sun, Mar 16, 2008 at 9:47 AM, Jonatan Liljedahl <lijon@kymatica.com> wrote:
Rory Walsh wrote:
> Balan posted the code at the end of his email. I had a quick look but
> couldn't spot anything obvious. Is it Ok to call csoundScoreEvent()
> before a performance has started?

Yes, I do this in AlgoScore and it works fine.
But I don't think it's correct to call csoundInitialize() after
csoundCreate()! In AlgoScore I call csoundInitialize(0,0,0) (once)
before I do anything else with csound.

static naRef f_create(naContext ctx, naRef me, int argc, naRef *args) {
   static cs_initialized=0;
   HostData *data;
   if(!cs_initialized) {
       csoundInitialize(0,0,0);
       cs_initialized=1;
   }
   data = (HostData*)malloc(sizeof(HostData));
   data->tag = NUMARG(0);
   data->graph_cb = naNil();
   data->outvalues = naNil();
   CSOUND *cs = csoundCreate((void*)data);
   return newCsoundGhost(ctx,cs);
}
>
> Rory.
>
>
> victor wrote:
>> That seems correct. Can you quote your code?
>>
>>     ----- Original Message -----
>>     *From:* Balan Clockfactory <mailto:balanclock@gmail.com>
>>     *To:* Developer discussions <mailto:csound-devel@lists.sourceforge.net>
>>     *Sent:* Saturday, March 15, 2008 10:03 PM
>>     *Subject:* Re: [Cs-dev] matlab interface
>>
>>     I hope I'm not being a nuisance but I am currently getting an error
>>     when I call csoundScoreEvent().  The error is "invalid instrument
>>     number or name".  I am testing with a very simple instrument so I'm
>>     no
>
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--
/Jonatan         [ http://kymatica.com ]

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