Clarinet.h

#ifndef STK_CLARINET_H
#define STK_CLARINET_H
 
#include "Instrmnt.h"
#include "DelayL.h"
#include "ReedTable.h"
#include "OneZero.h"
#include "Envelope.h"
#include "Noise.h"
#include "SineWave.h"
 
namespace stk {
 
/***************************************************/
/***************************************************/
 
class Clarinet : public Instrmnt
{
 public:
 
  Clarinet( StkFloat lowestFrequency = 8.0 );
 
  ~Clarinet( void );
 
  void clear( void );
 
  void setFrequency( StkFloat frequency );
 
  void startBlowing( StkFloat amplitude, StkFloat rate );
 
  void stopBlowing( StkFloat rate );
 
  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:
 
  DelayL delayLine_;
  ReedTable reedTable_;
  OneZero filter_;
  Envelope envelope_;
  Noise noise_;
  SineWave vibrato_;
 
  StkFloat outputGain_;
  StkFloat noiseGain_;
  StkFloat vibratoGain_;
};
 
inline StkFloat Clarinet :: tick( unsigned int )
{
  StkFloat pressureDiff;
  StkFloat breathPressure;
 
  // Calculate the breath pressure (envelope + noise + vibrato)
  breathPressure = envelope_.tick(); 
  breathPressure += breathPressure * noiseGain_ * noise_.tick();
  breathPressure += breathPressure * vibratoGain_ * vibrato_.tick();
 
  // Perform commuted loss filtering.
  pressureDiff = -0.95 * filter_.tick( delayLine_.lastOut() );
 
  // Calculate pressure difference of reflected and mouthpiece pressures.
  pressureDiff = pressureDiff - breathPressure;
 
  // Perform non-linear scattering using pressure difference in reed function.
  lastFrame_[0] = delayLine_.tick(breathPressure + pressureDiff * reedTable_.tick(pressureDiff));
 
  // Apply output gain.
  lastFrame_[0] *= outputGain_;
 
  return lastFrame_[0];
}
 
inline StkFrames& Clarinet :: tick( StkFrames& frames, unsigned int channel )
{
  unsigned int nChannels = lastFrame_.channels();
#if defined(_STK_DEBUG_)
  if ( channel > frames.channels() - nChannels ) {
    oStream_ << "Clarinet::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