[Stk] Polyphony and Stereo Panning with CrtSine

[Stephen Sinclair]

> What is the best way to generate multiple tones and implement this
> simultaneously with a callback function

Two options are important here.  When you open a real-time output
stream using RtAudio::openStream,  you can provide StreamParameters
and StreamOptions.  nChannels is specified in StreamParameters, and
should be set to 2.

Then, StreamOptions::flags can have the option RTAUDIO_NONINTERLEAVED.
 By default it is not set, so the data provided to the callback is
interleaved.  Therefore you can do hard panning of your two sines by:

for ( unsigned int i=0; i<nBufferFrames; i++ ) {
  *outputSamples++ = data->sine->tick();
  *outputSamples++ = data->sineTwo->tick();
}

Otherwise if you select the non-interleaved format, then hard panning
should be accomplished by:

for ( unsigned int i=0; i<nBufferFrames; i++ ) {
  outputSamples[i] = data->sine->tick();
  outputSamples[i + nBufferFrames] = data->sineTwo->tick();
}


Steve

On Wed, Sep 19, 2012 at 5:44 PM, Adams, Alexander <aadams85 at uncc.edu> wrote:
> I need to generate two Sinewaves and assign outputs to them either by hard
> panning left and right or with selected outputs.  i am able generate one
> sine wave and pane it either way by doing
>
> *outputSamples++ = data->sine->tick();
> *outputSamples++ = data->pan;
> or
>
> *outputSamples++ = data->sineTwo->tick();
> *outputSamples++ = data->pan;
>
> What is the best way to generate multiple tones and implement this
> simultaneously with a callback function or should i be using something from
> the instrument class...i am on a bit of a time constraint so help would be
> greatly appreciated.
>
> Thanks
>
> also i am new to Stk so details and/or sample code would be great.....Thanks
>
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