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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 
00055   void setNotch( StkFloat frequency, StkFloat radius );
00056 
00058   StkFloat lastOut( void ) const { return lastFrame_[0]; };
00059 
00061   StkFloat tick( StkFloat input );
00062 
00064 
00072   StkFrames& tick( StkFrames& frames, unsigned int channel = 0 );
00073 
00075 
00083   StkFrames& tick( StkFrames& iFrames, StkFrames &oFrames, unsigned int iChannel = 0, unsigned int oChannel = 0 );
00084 
00085  protected:
00086 
00087   void sampleRateChanged( StkFloat newRate, StkFloat oldRate );
00088 };
00089 
00090 inline StkFloat TwoZero :: tick( StkFloat input )
00091 {
00092   inputs_[0] = gain_ * input;
00093   lastFrame_[0] = b_[2] * inputs_[2] + b_[1] * inputs_[1] + b_[0] * inputs_[0];
00094   inputs_[2] = inputs_[1];
00095   inputs_[1] = inputs_[0];
00096 
00097   return lastFrame_[0];
00098 }
00099 
00100 inline StkFrames& TwoZero :: tick( StkFrames& frames, unsigned int channel )
00101 {
00102 #if defined(_STK_DEBUG_)
00103   if ( channel >= frames.channels() ) {
00104     errorString_ << "TwoZero::tick(): channel and StkFrames arguments are incompatible!";
00105     handleError( StkError::FUNCTION_ARGUMENT );
00106   }
00107 #endif
00108 
00109   StkFloat *samples = &frames[channel];
00110   unsigned int hop = frames.channels();
00111   for ( unsigned int i=0; i<frames.frames(); i++, samples += hop ) {
00112     inputs_[0] = gain_ * *samples;
00113     *samples = b_[2] * inputs_[2] + b_[1] * inputs_[1] + b_[0] * inputs_[0];
00114     inputs_[2] = inputs_[1];
00115     inputs_[1] = inputs_[0];
00116   }
00117 
00118   lastFrame_[0] = *(samples-hop);
00119   return frames;
00120 }
00121 
00122 inline StkFrames& TwoZero :: tick( StkFrames& iFrames, StkFrames& oFrames, unsigned int iChannel, unsigned int oChannel )
00123 {
00124 #if defined(_STK_DEBUG_)
00125   if ( iChannel >= iFrames.channels() || oChannel >= oFrames.channels() ) {
00126     errorString_ << "TwoZero::tick(): channel and StkFrames arguments are incompatible!";
00127     handleError( StkError::FUNCTION_ARGUMENT );
00128   }
00129 #endif
00130 
00131   StkFloat *iSamples = &iFrames[iChannel];
00132   StkFloat *oSamples = &oFrames[oChannel];
00133   unsigned int iHop = iFrames.channels(), oHop = oFrames.channels();
00134   for ( unsigned int i=0; i<iFrames.frames(); i++, iSamples += iHop, oSamples += oHop ) {
00135     inputs_[0] = gain_ * *iSamples;
00136     *oSamples = b_[2] * inputs_[2] + b_[1] * inputs_[1] + b_[0] * inputs_[0];
00137     inputs_[2] = inputs_[1];
00138     inputs_[1] = inputs_[0];
00139   }
00140 
00141   lastFrame_[0] = *(oSamples-oHop);
00142   return iFrames;
00143 }
00144 
00145 } // stk namespace
00146 
00147 #endif

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