Re: [Csnd-dev] [EXTERNAL] [Csnd-dev] arrays in the API

Ok I have changed the interface. We get the channel pointer and then use API to
access the array data.
Here’s a test program

int main(int argc, char **argv) {

  CSOUND  *csound;
  ARRAYDAT *adat, *adat2;
  const MYFLT *data;
  MYFLT indata[4] = {5,6,7,8};
  int   n, siz;

  const char *code = R"ORC(
   instr 1
   kArr[] fillarray 1,2,3,4  // array data for output
   kArr2[] init 4    // array data for input

   chnset kArr, "testout" // set channel
   kArr2[] chnget "testin" // get channel

   printarray kArr2  // print channel
   endin
   )ORC";

  csound = csoundCreate(NULL, NULL);
  csoundSetOption(csound,"-n");
  csoundCompileOrc(csound, code, 0);
  csoundEventString(csound, "i1 0 1", 0);
  csoundStart(csound);

  // perform once
  csoundPerformKsmps(csound);

  // access channels directly 
  csoundGetChannelPtr(csound, (void **) &adat, "testout", CSOUND_ARRAY_CHANNEL
                      | CSOUND_OUTPUT_CHANNEL);
  csoundGetChannelPtr(csound, (void **) &adat2, "testin", CSOUND_ARRAY_CHANNEL
                      | CSOUND_INPUT_CHANNEL);

  // get channel data
  data = (const MYFLT *) csoundGetArrayData(adat);
  siz = csoundArrayDataSizes(adat)[0];
  for(n = 0; n < siz; n++)
    printf("[%d]: %f \n", n, data[n]);

  // set channel data
  csoundSetArrayData(adat2, (void *) indata);

  // perform again
  csoundPerformKsmps(csound);
  csoundDestroy(csound);

  return 0;
}




> On 10 Aug 2024, at 18:06, vlz <[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.
> Agreed. I have a design for this and I'll go ahead and implement.
> 
> Prof. Victor Lazzarini 
> Maynooth University
> Ireland
> 
>> On 9 Aug 2024, at 18:49, Rory Walsh <[email protected]> wrote:
>> 
>>  I'd be leaning towards making it opaque and doing the same for PVSDATEXT. 
>> 
>> On Fri, 9 Aug 2024 at 14:56, Victor Lazzarini <[email protected]> wrote:
>> I am now wondering about the best way to give access to arrays in the API.
>> 
>> (1) Expose ARRAYDAT: at the moment the array data structure is transparent, so we can access all its members directly.
>> 
>> or
>> 
>> (2) Provide an interface: we can make the object opaque, providing access through API functions.
>> 
>> I can't decide. At the moment, STRINGDAT is opaque but PVSDATEXT is not. I am thinking of changing that one but have not decided yet.
>> 
>> Option 2 is safer but may be cumbersome for users.
>> 
>> Prof. Victor Lazzarini
>> Maynooth University
>> Ireland