Re: [Csnd-dev] Csound 7: csoundListChannels returns always 0

and the reason is that instr0 code (header) gets called by csoundStart() in this case. So the channels had not yet been created.

Prof. Victor Lazzarini
Maynooth University

Ireland

On 5 Sep 2024, at 09:27, Tarmo Johannes <[email protected]> wrote:



Hm,

in CsoundQt with the latest pull from Csound feature/newapi still the same result:

controlChannelInfo_t *channelList;
int numChannels = csoundListChannels(ud->csound, &channelList);

the second lines sets channelList to 0x0 and returns 0 as numChannels.

When I build CsoundQt (the non modified code) agains Csound6, it returns correct number of channels.

I need to go now but will think have closer look later. Maybe it is when is csoundStart() called.

tarmo

Kontakt vlz (<[email protected] >) kirjutas kuupäeval N, 5. september 2024 kell 10:59:

I tested it here and it is working. See the test program

const char *code =

"0dbfs = 1 \n"

"chn_k \"pitch\",3 \n"

"instr 1 \n"

"kp chnget \"pitch\" \n"

"a1 expon p4,p3,0.001 \n"

"a2 oscil a1,cpsmidinn(p5)*kp\n"

" out a2 \n"

"endin \n";

int main(int argc, const char *argv[]) {

/* Create the Csound engine instance */

CSOUND *csound = csoundCreate(NULL, NULL);

if(csound != NULL) {

int res = CSOUND_SUCCESS, i;

/* Set options checking for any errors */

for(i = 1; i < argc; i++)

res += csoundSetOption(csound, argv[i]);

if(res == CSOUND_SUCCESS) {

/* Compile code from string, synchronously */

res = csoundCompileOrc(csound, code, 0);

if(res == CSOUND_SUCCESS) {

char evt[64];

MYFLT dur = 5.;

MYFLT pitch = 1., incr = 1./(dur*csoundGetKr(csound));

/* Start engine */

res = csoundStart(csound);

controlChannelInfo_t *list;

int chn = csoundListChannels(csound, &list);

csoundMessage(csound, "%d channels\n", chn);

/* send realtine event, synchronously */

snprintf(evt, 64, "i1 0 %f 0.1 60\n", dur);

csoundEventString(csound, evt, 0);

/* compute audio blocks */

csoundPerformKsmps(csound);

while(res == CSOUND_SUCCESS) {

csoundSetControlChannel(csound, "pitch", pitch);

res = csoundPerformKsmps(csound);

pitch += incr;

if(pitch > 2)

csoundEventString(csound, "e 0", 0);

}

}

}

/* Destroy the engine instance */

csoundDestroy(csound);

return 0;

}

return -1;

}

It prints

SECTION 1:

1 channels

new alloc for instr 1:

T 5.000 TT 5.000 M: 0.09989

End of Performance inactive allocs returned to freespace

overall amps: 0.09989

overall samples out of range: 0

0 errors in performance

> On 5 Sep 2024, at 08:06, Tarmo Johannes <[email protected] > wrote:

>

> Hi,

>

> This is mostly meant for Victor:

>

> Testing CsoundQt with Csound7 I discovered that the inital values are not read any more from the widgets, chnget returns 0 until the the widget is moved.

>

> CsoudnQt goes through the channels declared with chn_k/chn_S and puts a value read from according widgets into the channels.

> see https://github.com/CsoundQt/CsoundQt/blob/5ca6f63a11a470575bc53fcdc3629cd8079df2b4/src/csoundengine.cpp#L1062

>

> The problem is that with Csound 7 (built from feature/newapi Augus 30)

>

> csoundListChannels()

>

> returns always 0, although there are declared channels:

>

> controlChannelInfo_t *channelList;

> int numChannels = csoundListChannels(ud->csound, &channelList);

>

> What has changed? Might be that I need to implement it differently on CsoundQt side.

>

> Should I file a bug report?

>

> tarmo