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

Hi!

yes, it was csoundStart(), inserting it 'kind of' solved the problem - now
the channels are read correctly - but I am not certain how to do it
properly.

The function in question is  CsoundEngine::runCsound()
https://github.com/CsoundQt/CsoundQt/blob/cbbcdaed5e002c280903e6c95d30a0d88ca4f858/src/csoundengine.cpp#L762

This is how it was organized before:

csoundCreate
 / setting callbacks etc /
csoundCompile
setupChannels ( including csoundListChannels() )
new CsoundPerformanceThread
CsoundPerformanceThread::Play()


Now I tried to insert csoundStart() before and after csoundCompile. If
before, the csoundCompile fails, if after, csoundStart() returned -1 and
reported in the console "Csound is already started, call csoundReset()
before starting again."
If I ignore the error and just keep going, everythings seems to work fine
but I don't like the message in CsoundQt console and ignoring error code
also does not feel right.

Can you see how to solve it?

Tarmo

Kontakt vlz (<[email protected]>) kirjutas kuupäeval N, 5. september
2024 kell 13:09:

> 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
>