NRev.h

#ifndef STK_NREV_H
#define STK_NREV_H
 
#include "Effect.h"
#include "Delay.h"
 
namespace stk {
 
/***************************************************/
/***************************************************/
 
class NRev : public Effect
{
 public:
  NRev( StkFloat T60 = 1.0 );
 
  void clear( void );
 
  void setT60( StkFloat T60 );
 
 
  StkFloat lastOut( unsigned int channel = 0 );
 
 
  StkFloat tick( StkFloat input, unsigned int channel = 0 );
 
 
  StkFrames& tick( StkFrames& frames, unsigned int channel = 0 );
 
 
  StkFrames& tick( StkFrames& iFrames, StkFrames &oFrames, unsigned int iChannel = 0, unsigned int oChannel = 0 );
 
 protected:
 
  Delay allpassDelays_[8];
  Delay combDelays_[6];
  StkFloat allpassCoefficient_;
  StkFloat combCoefficient_[6];
         StkFloat lowpassState_;
 
};
 
inline StkFloat NRev :: lastOut( unsigned int channel )
{
#if defined(_STK_DEBUG_)
  if ( channel > 1 ) {
    oStream_ << "NRev::lastOut(): channel argument must be less than 2!";
    handleError( StkError::FUNCTION_ARGUMENT );
  }
#endif
 
  return lastFrame_[channel];
}
 
inline StkFloat NRev :: tick( StkFloat input, unsigned int channel )
{
#if defined(_STK_DEBUG_)
  if ( channel > 1 ) {
    oStream_ << "NRev::tick(): channel argument must be less than 2!";
    handleError( StkError::FUNCTION_ARGUMENT );
  }
#endif
 
  StkFloat temp, temp0, temp1, temp2, temp3;
  int i;
 
  temp0 = 0.0;
  for ( i=0; i<6; i++ ) {
    temp = input + (combCoefficient_[i] * combDelays_[i].lastOut());
    temp0 += combDelays_[i].tick(temp);
  }
 
  for ( i=0; i<3; i++ )    {
    temp = allpassDelays_[i].lastOut();
    temp1 = allpassCoefficient_ * temp;
    temp1 += temp0;
    allpassDelays_[i].tick(temp1);
    temp0 = -(allpassCoefficient_ * temp1) + temp;
  }
 
         // One-pole lowpass filter.
  lowpassState_ = 0.7 * lowpassState_ + 0.3 * temp0;
  temp = allpassDelays_[3].lastOut();
  temp1 = allpassCoefficient_ * temp;
  temp1 += lowpassState_;
  allpassDelays_[3].tick( temp1 );
  temp1 = -( allpassCoefficient_ * temp1 ) + temp;
    
  temp = allpassDelays_[4].lastOut();
  temp2 = allpassCoefficient_ * temp;
  temp2 += temp1;
  allpassDelays_[4].tick( temp2 );
  lastFrame_[0] = effectMix_*( -( allpassCoefficient_ * temp2 ) + temp );
    
  temp = allpassDelays_[5].lastOut();
  temp3 = allpassCoefficient_ * temp;
  temp3 += temp1;
  allpassDelays_[5].tick( temp3 );
  lastFrame_[1] = effectMix_*( - ( allpassCoefficient_ * temp3 ) + temp );
 
  temp = ( 1.0 - effectMix_ ) * input;
  lastFrame_[0] += temp;
  lastFrame_[1] += temp;
    
  return lastFrame_[channel];
}
 
} // stk namespace
 
#endif