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

Double stupid me.....

First -  I was moving between two branches and build setting between csound
6 and 7 and did not notice that indeed I was on the Csound6 branch with the
latest tryout.

Second - I did not  noitice, I had already inserted csoundStart() to the
code with some earlier fix but that was run after setupChannels(). Now it
is all sorted out and works as expected.

Thank  you, Victor!

I am testing now my own recent works with CsoundQt and Csound7 and so far
everything seems to work. I will report if I find any problems.

Best!
tarmo

Kontakt vlz (<[email protected]>) kirjutas kuupäeval L, 7. september
2024 kell 23:37:

> On Csound 6, csoundCompile() calls csoundStart() internally, so for 7,
> the sequence
>
> csoundCompile(csound, argc, argv);
> csoundStart(csound);
>
> should reproduce the previous behaviour. The message you are getting
> should not happen in Csound 7.0. It will happen in Csound 6.
>
> Prof. Victor Lazzarini
> Maynooth University
> Ireland
>
> On 7 Sep 2024, at 21:18, Tarmo Johannes <[email protected]> wrote:
>
> 
> 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
>>
>