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Sitar.h

00001 #ifndef STK_SITAR_H
00002 #define STK_SITAR_H
00003 
00004 #include "Instrmnt.h"
00005 #include "DelayA.h"
00006 #include "OneZero.h"
00007 #include "Noise.h"
00008 #include "ADSR.h"
00009 #include <cmath>
00010 
00011 namespace stk {
00012 
00013 /***************************************************/
00030 /***************************************************/
00031 
00032 class Sitar : public Instrmnt
00033 {
00034  public:
00036   Sitar( StkFloat lowestFrequency = 8.0 );
00037 
00039   ~Sitar( void );
00040 
00042   void clear( void );
00043 
00045   void setFrequency( StkFloat frequency );
00046 
00048   void pluck( StkFloat amplitude );
00049 
00051   void noteOn( StkFloat frequency, StkFloat amplitude );
00052 
00054   void noteOff( StkFloat amplitude );
00055 
00057   StkFloat tick( unsigned int channel = 0 );
00058 
00060 
00067   StkFrames& tick( StkFrames& frames, unsigned int channel = 0 );
00068 
00069  protected:
00070 
00071   DelayA  delayLine_;
00072   OneZero loopFilter_;
00073   Noise   noise_;
00074   ADSR    envelope_;
00075 
00076   StkFloat loopGain_;
00077   StkFloat amGain_;
00078   StkFloat delay_;
00079   StkFloat targetDelay_;
00080 
00081 };
00082 
00083 inline StkFloat Sitar :: tick( unsigned int )
00084 {
00085   if ( fabs(targetDelay_ - delay_) > 0.001 ) {
00086     if ( targetDelay_ < delay_ )
00087       delay_ *= 0.99999;
00088     else
00089       delay_ *= 1.00001;
00090     delayLine_.setDelay( delay_ );
00091   }
00092 
00093   lastFrame_[0] = delayLine_.tick( loopFilter_.tick( delayLine_.lastOut() * loopGain_ ) + 
00094                                 (amGain_ * envelope_.tick() * noise_.tick()));
00095   
00096   return lastFrame_[0];
00097 }
00098 
00099 inline StkFrames& Sitar :: tick( StkFrames& frames, unsigned int channel )
00100 {
00101   unsigned int nChannels = lastFrame_.channels();
00102 #if defined(_STK_DEBUG_)
00103   if ( channel > frames.channels() - nChannels ) {
00104     oStream_ << "Sitar::tick(): channel and StkFrames arguments are incompatible!";
00105     handleError( StkError::FUNCTION_ARGUMENT );
00106   }
00107 #endif
00108 
00109   StkFloat *samples = &frames[channel];
00110   unsigned int j, hop = frames.channels() - nChannels;
00111   if ( nChannels == 1 ) {
00112     for ( unsigned int i=0; i<frames.frames(); i++, samples += hop )
00113       *samples++ = tick();
00114   }
00115   else {
00116     for ( unsigned int i=0; i<frames.frames(); i++, samples += hop ) {
00117       *samples++ = tick();
00118       for ( j=1; j<nChannels; j++ )
00119         *samples++ = lastFrame_[j];
00120     }
00121   }
00122 
00123   return frames;
00124 }
00125 
00126 } // stk namespace
00127 
00128 #endif
00129 

The Synthesis ToolKit in C++ (STK)
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