Re: [Csnd-dev] [EXTERNAL] [Csnd-dev] New API progress report

I can access host data using the CPOF? I never thought of this.

On Sat, 27 Jul 2024 at 12:51, vlz <[email protected]> wrote:

> I think you should use hostdata for passing anything from host to Csound
> and vice-versa.
>
> It is probably more straightforward as you just pass the pointers
> directly. Would that be a problem?
>
> Prof. Victor Lazzarini
> Maynooth University
> Ireland
>
> On 27 Jul 2024, at 11:12, Rory Walsh <[email protected]> wrote:
>
> 
> With regards to:
>
> > csoundQueryGlobalVariable
> > csoundCreateGlobalVariable
>
> I have been using these methods to pass custom data structs between my
> opcodes and my host. I should have mentioned this earlier, but they slipped
> my attention. For example, some of my Csound opcodes can access widget
> classes owned by Cabbage. Perhaps it was never meant to be used in this
> way, but it's super powerful. I'm not sure how I can do this without them?
>
> On Sat, 27 Jul 2024 at 11:20, Victor Lazzarini <
> [email protected]> wrote:
>
>> Hi Tarmo,
>>
>> that’s great, this is one of the reasons we needed your input, so the API
>> can be tailored to the
>> needs of users.
>>
>> Regarding your issue, make sure the call is always after csoundStart(),
>> otherwise the spout will
>> not have been created. Here’s a simple test to show it
>>
>>     csoundStart(Csound);
>>     MYFLT *spout = csoundGetSpout(Csound);
>>     printf("spout = %p \n", spout)
>>
>> best
>> ========================
>> Prof. Victor Lazzarini
>> Maynooth University
>> Ireland
>>
>> > On 27 Jul 2024, at 09:31, Tarmo Johannes <[email protected]> wrote:
>> >
>> > Hi Victor!
>> >
>> > Thank you for the changes, it helps a lot.
>> >
>> > > csoundGetModule
>> > > csoundSetMIDIModule
>> > > csoundSetRTAudioModule
>> >
>> > Are used in config dialog to populate a menu to list the available
>> modules. Now it works fine again.
>> > I reverted some of my changes, left libcsnd out of libraries (this is
>> good news that it is not needed any more!) and CsoundQt build fine.
>> >
>> > I still get crash when running a csd.
>> > MYFLT *outputBuffer = csoundGetSpout(udata->csound);
>> > returns 0 in some reason, I will see if I can figure out the reason
>> later.
>> >
>> > Thanks!
>> > tarmo
>> >
>> > Kontakt Victor Lazzarini (<
>> [email protected]>) kirjutas kuupäeval
>> L, 27. juuli 2024 kell 00:55:
>> > Hi Tarmo,
>> >
>> > I put back
>> >
>> > > csoundGetModule
>> > > csoundSetMIDIModule
>> > > csoundSetRTAudioModule
>> >
>> > plus the set global env and the circular buffer functions. It’s in the
>> repo now.
>> >
>> > Best
>> >
>> > Victor
>> >
>> > > On 26 Jul 2024, at 20:29, Tarmo Johannes <[email protected]> wrote:
>> > >
>> > > *Warning*
>> > > This email originated from outside of Maynooth University's Mail
>> System. Do not reply, click links or open attachments unless you recognise
>> the sender and know the content is safe.
>> > > Hi!
>> > >
>> > > I tried out the new API from feature/newapi branch.
>> > >
>> > > Building csound7 went fine, I installed it to $HOME/.local (Linux)
>> and added  $HOME/.local/lib to ldconfig libraries' path.
>> > >
>> > > First I tried it with a relatively simple Qt project using Csound C++
>> API (csound.hpp). After some changes everything worked fine. One question:
>> > >
>> > > when before there was Csound::stop() / csoundStop() , how is it now
>> the proper way to end Csound's work? Also csoundCleanup() is gone. is
>> csoundReset() it that does it all?
>> > >
>> > > Then I went to CsoundQt and of course that is much, much more
>> complex  case.
>> > >
>> > > First -  I guess libcsnd7 is not  is built by default? Is it still
>> existing, how should I configure it?  CsoundQt uses that for recording.
>> Maybe there is now a better way to rewrite the recording part.
>> > >
>> > > CsoundQt used the following functions that are not to be there any
>> more:
>> > >
>> > > csoundGetModule
>> > > csoundSetMIDIModule
>> > > csoundSetRTAudioModule
>> > >
>> > > I commented these lines out for now to move on. What covers their
>> functionality?
>> > >
>> > > There is no more circular buffer functions:
>> > > csoundCreateCircularBuffer
>> > > csoundReadCircularBuffer
>> > > etc
>> > >
>> > > CsoundQt leaned heavily on them for internal MIDI handling. What is
>> the correct way to handle it now?
>> > > For example reading MIDI data one should set the callback like:
>> > >         csoundSetExternalMidiReadCallback(ud->csound, &midiReadCb);
>> > >
>> > > CsoundQt used to have such a function for the callback:
>> > >
>> > > int CsoundEngine::midiReadCb(CSOUND *csound, void *ud_, unsigned char
>> *buf, int nBytes)
>> > > {
>> > >     CsoundUserData *ud = (CsoundUserData *) ud_;
>> > >     Q_UNUSED(csound);
>> > >     int count, countVirtual;
>> > >     count =  csoundReadCircularBuffer(ud->csound, ud->midiBuffer,
>> buf, nBytes);
>> > >     countVirtual =  csoundReadCircularBuffer(ud->csound,
>> ud->virtualMidiBuffer, buf + count, nBytes - count);
>> > >     return count + countVirtual;
>> > > }
>> > >
>> > > Should the host implement writing to the buffer and handling the
>> index itself?
>> > >
>> > > Is it so that csoundSetHostImplementedMIDIIO is replaced now with
>> > > PUBLIC void csoundSetHostMIDIIO(CSOUND *csound);
>> > >
>> > > How to deal with global variables?
>> > > csoundQueryGlobalVariable
>> > > csoundCreateGlobalVariable
>> > > are gone,
>> > >
>> > > csoundGetEnv is there but no csoundSetEnv, csoundSetGlobalEnv or
>> similar?
>> > >
>> > > at the moment I replaced them with Qt specific functions to deal with
>> environment variables.
>> > >
>> > > What is the correct environment variable for the plugins directory,
>> OPCODE7DIR64?
>> > >
>> > > I got CsoundQt building but it crashes when I run a file. I did not
>> have time yet to dig into it,  there are many possible reasons.  I hope to
>> continue tomorrow.
>> > >
>> > > Exciting!
>> > > tarmo
>> > >
>> > > Kontakt Victor Lazzarini (<
>> [email protected]>) kirjutas kuupäeval
>> N, 25. juuli 2024 kell 18:27:
>> > >
>> > > Just another progress report for the feature/newapi branch
>> > >
>> > > - I have now mainlined the new API in csound.h
>> > > - Updated the csound.hpp wrapper
>> > > - Updated the csPerformanceThread code
>> > > - Modified frontends to use it
>> > > - Modified the C++ test suite
>> > >
>> > > It is all working, I guess frontend developers can take a look and
>> see what they
>> > > think.
>> > >
>> > > François: could you take a look at the Python wrapper? It is out of
>> sync now.
>> > >
>> > > Victor
>> > >
>> > >
>> >
>>
>>