|
You could just do this in C++ and declare your buffer as
std::vector<MYFLT> and keep pushing the ksmps buffers back onto it,
something like the following.
I'm not sure I remember all the exact function names, but
something like this should work (for mono, anyway):
void getSynthBuffer(std::vector<MYFLT> &output,
std::string csd, int argc, const char **argv)
{
static bool initialized =
false;
static CppSound csound;
if (!initialized) {
csound.setCSD(csd);
csound.initialize(argc,
argv, 0);
initialized =
true;
}
output.clear(); csound.setCSD(csd);
csound.exportForPerformance();
csound.compile();
MYFLT *spout = csound.GetSpout();
while (!csound.performKsmps())
{
for (size_t j = 0, n = csound.GetSpoutSize(); ++j) {
output.push_back(spout[j]);
}
}
}
Hope this helps,
Mike
----- Original Message -----
Sent: Sunday, March 16, 2008 7:05
PM
Subject: Re: [Cs-dev] matlab
interface
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);
--
/Jonatan [ http://kymatica.com
]
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