Bugs item #3305875, was opened at 2011-05-22 13:11
Message generated for change (Tracker Item Submitted) made by david-bluecame
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Category: Csound API
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: David Bluecame (david-bluecame)
Assigned to: Nobody/Anonymous (nobody)
Summary: Csound5.13.0 Jacko and CsoundPerformKsmps(), etc

Initial Comment:
When using the Jacko opcodes JackoInit and JackoOn in the orchestra, the API functions CsoundPerformKsmps() and CsoundPerformBuffer() perform the entire score and not only the desired ksmps/buffer. This causes undesired behaviour in any host application using those API functions.

I've been wondering if this has been done on purpose to avoid closing the Jack connections after a ksmps or buffer is performed. However, I think that it should not affect those functions, just recommend not using them in Jacko orchestras.

Steps to reproduce:
* Start jack
* Create any normal orchestra/score. The orchestra should have the same ksmps value as the Jack you are using.
* Create this example program (for example, let's call it csound_api1.c)

#include 
#include 
int main(int argc, char **argv)
{
  CSOUND *csound = csoundCreate(NULL);
  int result = csoundCompile(csound, argc, argv);
int i=0;
  while (result == 0) {
    result = csoundPerformKsmps(csound);
	printf("i=%d\n", i);
	i++;
	}
  csoundDestroy(csound);
  return (result >= 0 ? 0 : result);
}

* Compile with:
csound_api1.c -o csound_api1  -lcsound

* Use with
./csound_api1  (and whatever options you use for csound as the orchestra filename, score filename, etc)

It should perform the score/orchestra normally, and it will output a lot of printout to stdout, one for each execution of CsoundScorePerformKsmps(). This is the normal and expected behaviour.

* Now, add the following in the orchestra, just below the ksmps, sr, etc, settings
   JackoInit		"default", "csound"
   JackoOn 1

* Use with
./csound_api1  (and whatever options you use for csound as the orchestra filename, score filename, etc)

It should perform now the entire score/orchestra normally, but this time only one or two lines of the stdout printout, so the entire score has been performed by a single CsoundScorePerformKsmps()!!. This is NOT the normal and expected behaviour.

Best regards. David.


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