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

Looking at this, I think the change is that csoundStart() *always* need to be called now (it was an anomaly that it didn’t in some cases).
So in the past if you used csoundCompile(csound, argc, arg), then csoundStart() was called and so channels would be there because
it starts Csound running. 

> 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