stk/projects/examples/crtsine.cpp

// crtsine.cpp STK tutorial program

#include "SineWave.h"
#include "RtAudio.h"
using namespace stk;

// This tick() function handles sample computation only.  It will be
// called automatically when the system needs a new buffer of audio
// samples.
int tick( void *outputBuffer, void *inputBuffer, unsigned int nBufferFrames,
         double streamTime, RtAudioStreamStatus status, void *dataPointer )
{
  SineWave *sine = (SineWave *) dataPointer;
  StkFloat *samples = (StkFloat *) outputBuffer;

  for ( unsigned int i=0; i<nBufferFrames; i++ )
    *samples++ = sine->tick();

  return 0;
}

int main()
{
  // Set the global sample rate before creating class instances.
  Stk::setSampleRate( 44100.0 );

  SineWave sine;
  RtAudio dac;

  // Figure out how many bytes in an StkFloat and setup the RtAudio stream.
  RtAudio::StreamParameters parameters;
  parameters.deviceId = dac.getDefaultOutputDevice();
  parameters.nChannels = 1;
  RtAudioFormat format = ( sizeof(StkFloat) == 8 ) ? RTAUDIO_FLOAT64 : RTAUDIO_FLOAT32;
  unsigned int bufferFrames = RT_BUFFER_SIZE;
  if ( dac.openStream( &parameters, NULL, format, (unsigned int)Stk::sampleRate(), &bufferFrames, &tick, (void *)&sine ) ) {
    std::cout << dac.getErrorText() << std::endl;
    goto cleanup;
  }

  sine.setFrequency(440.0);

  if ( dac.startStream() ) {
    std::cout << dac.getErrorText() << std::endl;
    goto cleanup;
  }

  // Block waiting here.
  char keyhit;
  std::cout << "\nPlaying ... press <enter> to quit.\n";
  std::cin.get( keyhit );

  // Shut down the output stream.
  dac.closeStream();

 cleanup:

  return 0;
}