Modulate.h

#ifndef STK_MODULATE_H
#define STK_MODULATE_H
 
#include "Generator.h"
#include "SineWave.h"
#include "Noise.h"
#include "OnePole.h"
 
namespace stk {
 
/***************************************************/
/***************************************************/
 
class Modulate : public Generator
{
 public:
 
  Modulate( void );
 
  ~Modulate( void );
 
  void reset( void ) { lastFrame_[0] = 0.0; };
 
  void setVibratoRate( StkFloat rate ) { vibrato_.setFrequency( rate ); };
 
  void setVibratoGain( StkFloat gain ) { vibratoGain_ = gain; };
 
  void setRandomRate( StkFloat rate ) {  noiseRate_ = (unsigned int) ( rate * Stk::sampleRate() / 22050.0 ); };
  
  void setRandomGain( StkFloat gain );
 
  StkFloat lastOut( void ) const { return lastFrame_[0]; };
 
  StkFloat tick( void );
 
 
  StkFrames& tick( StkFrames& frames, unsigned int channel = 0 );
 
 protected:
 
  void sampleRateChanged( StkFloat newRate, StkFloat oldRate );
 
  SineWave vibrato_;
  Noise noise_;
  OnePole  filter_;
  StkFloat vibratoGain_;
  StkFloat randomGain_;
  unsigned int noiseRate_;
  unsigned int noiseCounter_;
 
};
 
inline StkFloat Modulate :: tick( void )
{
  // Compute periodic and random modulations.
  lastFrame_[0] = vibratoGain_ * vibrato_.tick();
  if ( noiseCounter_++ >= noiseRate_ ) {
    noise_.tick();
    noiseCounter_ = 0;
  }
  lastFrame_[0] += filter_.tick( noise_.lastOut() );
  return lastFrame_[0];
}
 
inline StkFrames& Modulate :: tick( StkFrames& frames, unsigned int channel )
{
#if defined(_STK_DEBUG_)
  if ( channel >= frames.channels() ) {
    oStream_ << "Modulate::tick(): channel and StkFrames arguments are incompatible!";
    handleError( StkError::FUNCTION_ARGUMENT );
  }
#endif
 
  StkFloat *samples = &frames[channel];
  unsigned int hop = frames.channels();
  for ( unsigned int i=0; i<frames.frames(); i++, samples += hop )
    *samples = Modulate::tick();
 
  return frames;
}
 
} // stk namespace
 
#endif