StifKarp.h

#ifndef STK_STIFKARP_H
#define STK_STIFKARP_H
 
#include "Instrmnt.h"
#include "DelayL.h"
#include "DelayA.h"
#include "OneZero.h"
#include "Noise.h"
#include "BiQuad.h"
 
namespace stk {
 
/***************************************************/
/***************************************************/
 
class StifKarp : public Instrmnt
{
 public:
  StifKarp( StkFloat lowestFrequency = 10.0 );
 
  ~StifKarp( void );
 
  void clear( void );
 
  void setFrequency( StkFloat frequency );
 
  void setStretch( StkFloat stretch );
 
  void setPickupPosition( StkFloat position );
 
 
  void setBaseLoopGain( StkFloat aGain );
 
  void pluck( StkFloat amplitude );
 
  void noteOn( StkFloat frequency, StkFloat amplitude );
 
  void noteOff( StkFloat amplitude );
 
  void controlChange( int number, StkFloat value );
 
  StkFloat tick( unsigned int channel = 0 );
 
 
  StkFrames& tick( StkFrames& frames, unsigned int channel = 0 );
 
 protected:
 
  DelayA  delayLine_;
  DelayL  combDelay_;
  OneZero filter_;
  Noise   noise_;
  BiQuad  biquad_[4];
 
  StkFloat loopGain_;
  StkFloat baseLoopGain_;
  StkFloat lastFrequency_;
  StkFloat lastLength_;
  StkFloat stretching_;
  StkFloat pluckAmplitude_;
  StkFloat pickupPosition_;
 
};
 
inline StkFloat StifKarp :: tick( unsigned int )
{
  StkFloat temp = delayLine_.lastOut() * loopGain_;
 
  // Calculate allpass stretching.
  for (int i=0; i<4; i++)
    temp = biquad_[i].tick(temp);
 
  // Moving average filter.
  temp = filter_.tick(temp);
 
  lastFrame_[0] = delayLine_.tick(temp);
  lastFrame_[0] = lastFrame_[0] - combDelay_.tick( lastFrame_[0] );
  return lastFrame_[0];
}
 
inline StkFrames& StifKarp :: tick( StkFrames& frames, unsigned int channel )
{
  unsigned int nChannels = lastFrame_.channels();
#if defined(_STK_DEBUG_)
  if ( channel > frames.channels() - nChannels ) {
    oStream_ << "StifKarp::tick(): channel and StkFrames arguments are incompatible!";
    handleError( StkError::FUNCTION_ARGUMENT );
  }
#endif
 
  StkFloat *samples = &frames[channel];
  unsigned int j, hop = frames.channels() - nChannels;
  if ( nChannels == 1 ) {
    for ( unsigned int i=0; i<frames.frames(); i++, samples += hop )
      *samples++ = tick();
  }
  else {
    for ( unsigned int i=0; i<frames.frames(); i++, samples += hop ) {
      *samples++ = tick();
      for ( j=1; j<nChannels; j++ )
        *samples++ = lastFrame_[j];
    }
  }
 
  return frames;
}
 
} // stk namespace
 
#endif