#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
    \brief STK clarinet physical model class.

    This class implements a simple clarinet
    physical model, as discussed by Smith (1986),
    McIntyre, Schumacher, Woodhouse (1983), and
    others.

    This is a digital waveguide model, making its
    use possibly subject to patents held by Stanford
    University, Yamaha, and others.

    Control Change Numbers: 
       - Reed Stiffness = 2
       - Noise Gain = 4
       - Vibrato Frequency = 11
       - Vibrato Gain = 1
       - Breath Pressure = 128

    by Perry R. Cook and Gary P. Scavone, 1995 - 2009.
*/
/***************************************************/

class Clarinet : public Instrmnt
{
 public:
  //! Class constructor, taking the lowest desired playing frequency.
  /*!
    An StkError will be thrown if the rawwave path is incorrectly set.
  */
  Clarinet( StkFloat lowestFrequency );

  //! Class destructor.
  ~Clarinet( void );

  //! Reset and clear all internal state.
  void clear( void );

  //! Set instrument parameters for a particular frequency.
  void setFrequency( StkFloat frequency );

  //! Apply breath pressure to instrument with given amplitude and rate of increase.
  void startBlowing( StkFloat amplitude, StkFloat rate );

  //! Decrease breath pressure with given rate of decrease.
  void stopBlowing( StkFloat rate );

  //! Start a note with the given frequency and amplitude.
  void noteOn( StkFloat frequency, StkFloat amplitude );

  //! Stop a note with the given amplitude (speed of decay).
  void noteOff( StkFloat amplitude );

  //! Perform the control change specified by \e number and \e value (0.0 - 128.0).
  void controlChange( int number, StkFloat value );

  //! Compute and return one output sample.
  StkFloat tick( unsigned int channel = 0 );

 protected:

  DelayL delayLine_;
  ReedTable reedTable_;
  OneZero filter_;
  Envelope envelope_;
  Noise noise_;
  SineWave vibrato_;
  long length_;
  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];
}

} // stk namespace

#endif