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# TwoZero.h

    00001 #ifndef STK_TWOZERO_H
    00002 #define STK_TWOZERO_H
    00003
    00004 #include "Filter.h"
    00005
    00006 namespace stk {
    00007
    00008 /***************************************************/
    00018 /***************************************************/
    00019
    00020 class TwoZero : public Filter
    00021 {
    00022  public:
    00024   TwoZero();
    00025
    00027   ~TwoZero();
    00028
    00030   void ignoreSampleRateChange( bool ignore = true ) { ignoreSampleRateChange_ = ignore; };
    00031
    00033   void setB0( StkFloat b0 ) { b_[0] = b0; };
    00034
    00036   void setB1( StkFloat b1 ) { b_[1] = b1; };
    00037
    00039   void setB2( StkFloat b2 ) { b_[2] = b2; };
    00040
    00042   void setCoefficients( StkFloat b0, StkFloat b1, StkFloat b2, bool clearState = false );
    00043
    00045
    00057   void setNotch( StkFloat frequency, StkFloat radius );
    00058
    00060   StkFloat lastOut( void ) const { return lastFrame_[0]; };
    00061
    00063   StkFloat tick( StkFloat input );
    00064
    00066
    00074   StkFrames& tick( StkFrames& frames, unsigned int channel = 0 );
    00075
    00077
    00085   StkFrames& tick( StkFrames& iFrames, StkFrames &oFrames, unsigned int iChannel = 0, unsigned int oChannel = 0 );
    00086
    00087  protected:
    00088
    00089   void sampleRateChanged( StkFloat newRate, StkFloat oldRate );
    00090 };
    00091
    00092 inline StkFloat TwoZero :: tick( StkFloat input )
    00093 {
    00094   inputs_[0] = gain_ * input;
    00095   lastFrame_[0] = b_[2] * inputs_[2] + b_[1] * inputs_[1] + b_[0] * inputs_[0];
    00096   inputs_[2] = inputs_[1];
    00097   inputs_[1] = inputs_[0];
    00098
    00099   return lastFrame_[0];
    00100 }
    00101
    00102 inline StkFrames& TwoZero :: tick( StkFrames& frames, unsigned int channel )
    00103 {
    00104 #if defined(_STK_DEBUG_)
    00105   if ( channel >= frames.channels() ) {
    00106     oStream_ << "TwoZero::tick(): channel and StkFrames arguments are incompatible!";
    00107     handleError( StkError::FUNCTION_ARGUMENT );
    00108   }
    00109 #endif
    00110
    00111   StkFloat *samples = &frames[channel];
    00112   unsigned int hop = frames.channels();
    00113   for ( unsigned int i=0; i<frames.frames(); i++, samples += hop ) {
    00114     inputs_[0] = gain_ * *samples;
    00115     *samples = b_[2] * inputs_[2] + b_[1] * inputs_[1] + b_[0] * inputs_[0];
    00116     inputs_[2] = inputs_[1];
    00117     inputs_[1] = inputs_[0];
    00118   }
    00119
    00120   lastFrame_[0] = *(samples-hop);
    00121   return frames;
    00122 }
    00123
    00124 inline StkFrames& TwoZero :: tick( StkFrames& iFrames, StkFrames& oFrames, unsigned int iChannel, unsigned int oChannel )
    00125 {
    00126 #if defined(_STK_DEBUG_)
    00127   if ( iChannel >= iFrames.channels() || oChannel >= oFrames.channels() ) {
    00128     oStream_ << "TwoZero::tick(): channel and StkFrames arguments are incompatible!";
    00129     handleError( StkError::FUNCTION_ARGUMENT );
    00130   }
    00131 #endif
    00132
    00133   StkFloat *iSamples = &iFrames[iChannel];
    00134   StkFloat *oSamples = &oFrames[oChannel];
    00135   unsigned int iHop = iFrames.channels(), oHop = oFrames.channels();
    00136   for ( unsigned int i=0; i<iFrames.frames(); i++, iSamples += iHop, oSamples += oHop ) {
    00137     inputs_[0] = gain_ * *iSamples;
    00138     *oSamples = b_[2] * inputs_[2] + b_[1] * inputs_[1] + b_[0] * inputs_[0];
    00139     inputs_[2] = inputs_[1];
    00140     inputs_[1] = inputs_[0];
    00141   }
    00142
    00143   lastFrame_[0] = *(oSamples-oHop);
    00144   return iFrames;
    00145 }
    00146
    00147 } // stk namespace
    00148
    00149 #endif

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