Sitar.h

#ifndef STK_SITAR_H
#define STK_SITAR_H
 
#include "Instrmnt.h"
#include "DelayA.h"
#include "OneZero.h"
#include "Noise.h"
#include "ADSR.h"
#include <cmath>
 
namespace stk {
 
/***************************************************/
/***************************************************/
 
class Sitar : public Instrmnt
{
 public:
  Sitar( StkFloat lowestFrequency = 8.0 );
 
  ~Sitar( void );
 
  void clear( void );
 
  void setFrequency( StkFloat frequency );
 
  void pluck( StkFloat amplitude );
 
  void noteOn( StkFloat frequency, StkFloat amplitude );
 
  void noteOff( StkFloat amplitude );
 
  StkFloat tick( unsigned int channel = 0 );
 
 
  StkFrames& tick( StkFrames& frames, unsigned int channel = 0 );
 
 protected:
 
  DelayA  delayLine_;
  OneZero loopFilter_;
  Noise   noise_;
  ADSR    envelope_;
 
  StkFloat loopGain_;
  StkFloat amGain_;
  StkFloat delay_;
  StkFloat targetDelay_;
 
};
 
inline StkFloat Sitar :: tick( unsigned int )
{
  if ( fabs(targetDelay_ - delay_) > 0.001 ) {
    if ( targetDelay_ < delay_ )
      delay_ *= 0.99999;
    else
      delay_ *= 1.00001;
    delayLine_.setDelay( delay_ );
  }
 
  lastFrame_[0] = delayLine_.tick( loopFilter_.tick( delayLine_.lastOut() * loopGain_ ) + 
                                (amGain_ * envelope_.tick() * noise_.tick()));
  
  return lastFrame_[0];
}
 
inline StkFrames& Sitar :: tick( StkFrames& frames, unsigned int channel )
{
  unsigned int nChannels = lastFrame_.channels();
#if defined(_STK_DEBUG_)
  if ( channel > frames.channels() - nChannels ) {
    oStream_ << "Sitar::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