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00001 #ifndef STK_FLUTE_H 00002 #define STK_FLUTE_H 00003 00004 #include "Instrmnt.h" 00005 #include "JetTable.h" 00006 #include "DelayL.h" 00007 #include "OnePole.h" 00008 #include "PoleZero.h" 00009 #include "Noise.h" 00010 #include "ADSR.h" 00011 #include "SineWave.h" 00012 00013 namespace stk { 00014 00015 /***************************************************/ 00037 /***************************************************/ 00038 00039 class Flute : public Instrmnt 00040 { 00041 public: 00043 00046 Flute( StkFloat lowestFrequency ); 00047 00049 ~Flute( void ); 00050 00052 void clear( void ); 00053 00055 void setFrequency( StkFloat frequency ); 00056 00058 void setJetReflection( StkFloat coefficient ) { jetReflection_ = coefficient; }; 00059 00061 void setEndReflection( StkFloat coefficient ) { endReflection_ = coefficient; }; 00062 00064 void setJetDelay( StkFloat aRatio ); 00065 00067 void startBlowing( StkFloat amplitude, StkFloat rate ); 00068 00070 void stopBlowing( StkFloat rate ); 00071 00073 void noteOn( StkFloat frequency, StkFloat amplitude ); 00074 00076 void noteOff( StkFloat amplitude ); 00077 00079 void controlChange( int number, StkFloat value ); 00080 00082 StkFloat tick( unsigned int channel = 0 ); 00083 00085 00092 StkFrames& tick( StkFrames& frames, unsigned int channel = 0 ); 00093 00094 protected: 00095 00096 DelayL jetDelay_; 00097 DelayL boreDelay_; 00098 JetTable jetTable_; 00099 OnePole filter_; 00100 PoleZero dcBlock_; 00101 Noise noise_; 00102 ADSR adsr_; 00103 SineWave vibrato_; 00104 00105 StkFloat lastFrequency_; 00106 StkFloat maxPressure_; 00107 StkFloat jetReflection_; 00108 StkFloat endReflection_; 00109 StkFloat noiseGain_; 00110 StkFloat vibratoGain_; 00111 StkFloat outputGain_; 00112 StkFloat jetRatio_; 00113 00114 }; 00115 00116 inline StkFloat Flute :: tick( unsigned int ) 00117 { 00118 StkFloat pressureDiff; 00119 StkFloat breathPressure; 00120 00121 // Calculate the breath pressure (envelope + noise + vibrato) 00122 breathPressure = maxPressure_ * adsr_.tick(); 00123 breathPressure += breathPressure * ( noiseGain_ * noise_.tick() + vibratoGain_ * vibrato_.tick() ); 00124 00125 StkFloat temp = -filter_.tick( boreDelay_.lastOut() ); 00126 temp = dcBlock_.tick( temp ); // Block DC on reflection. 00127 00128 pressureDiff = breathPressure - (jetReflection_ * temp); 00129 pressureDiff = jetDelay_.tick( pressureDiff ); 00130 pressureDiff = jetTable_.tick( pressureDiff ) + (endReflection_ * temp); 00131 lastFrame_[0] = (StkFloat) 0.3 * boreDelay_.tick( pressureDiff ); 00132 00133 lastFrame_[0] *= outputGain_; 00134 return lastFrame_[0]; 00135 } 00136 00137 inline StkFrames& Flute :: tick( StkFrames& frames, unsigned int channel ) 00138 { 00139 unsigned int nChannels = lastFrame_.channels(); 00140 #if defined(_STK_DEBUG_) 00141 if ( channel > frames.channels() - nChannels ) { 00142 oStream_ << "Flute::tick(): channel and StkFrames arguments are incompatible!"; 00143 handleError( StkError::FUNCTION_ARGUMENT ); 00144 } 00145 #endif 00146 00147 StkFloat *samples = &frames[channel]; 00148 unsigned int j, hop = frames.channels() - nChannels; 00149 if ( nChannels == 1 ) { 00150 for ( unsigned int i=0; i<frames.frames(); i++, samples += hop ) 00151 *samples++ = tick(); 00152 } 00153 else { 00154 for ( unsigned int i=0; i<frames.frames(); i++, samples += hop ) { 00155 *samples++ = tick(); 00156 for ( j=1; j<nChannels; j++ ) 00157 *samples++ = lastFrame_[j]; 00158 } 00159 } 00160 00161 return frames; 00162 } 00163 00164 } // stk namespace 00165 00166 #endif
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