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| The Synthesis ToolKit in C++ (STK) |
| ©1995-2009 Perry R. Cook and Gary P. Scavone. All Rights Reserved. |
| ©1995-2010 Perry R. Cook and Gary P. Scavone. All Rights Reserved. |
+Home Information Classes Download Usage Mail List Requirements Links FAQ Tutorial
00001 #ifndef STK_ADSR_H +00002 #define STK_ADSR_H +00003 +00004 #include "Generator.h" +00005 +00006 namespace stk { +00007 +00008 /***************************************************/ +00019 /***************************************************/ +00020 +00021 class ADSR : public Generator +00022 { +00023 public: +00024 +00026 enum { +00027 ATTACK, +00028 DECAY, +00029 SUSTAIN, +00030 RELEASE, +00031 DONE +00032 }; +00033 +00035 ADSR( void ); +00036 +00038 ~ADSR( void ); +00039 +00041 void keyOn( void ); +00042 +00044 void keyOff( void ); +00045 +00047 void setAttackRate( StkFloat rate ); +00048 +00050 void setDecayRate( StkFloat rate ); +00051 +00053 void setSustainLevel( StkFloat level ); +00054 +00056 void setReleaseRate( StkFloat rate ); +00057 +00059 void setAttackTime( StkFloat time ); +00060 +00062 void setDecayTime( StkFloat time ); +00063 +00065 void setReleaseTime( StkFloat time ); +00066 +00068 void setAllTimes( StkFloat aTime, StkFloat dTime, StkFloat sLevel, StkFloat rTime ); +00069 +00071 void setTarget( StkFloat target ); +00072 +00074 int getState( void ) const { return state_; }; +00075 +00077 void setValue( StkFloat value ); +00078 +00080 StkFloat lastOut( void ) const { return lastFrame_[0]; }; +00081 +00083 StkFloat tick( void ); +00084 +00086 +00093 StkFrames& tick( StkFrames& frames, unsigned int channel = 0 ); +00094 +00095 protected: +00096 +00097 void sampleRateChanged( StkFloat newRate, StkFloat oldRate ); +00098 +00099 int state_; +00100 StkFloat value_; +00101 StkFloat target_; +00102 StkFloat attackRate_; +00103 StkFloat decayRate_; +00104 StkFloat releaseRate_; +00105 StkFloat sustainLevel_; +00106 }; +00107 +00108 inline StkFloat ADSR :: tick( void ) +00109 { +00110 switch ( state_ ) { +00111 +00112 case ATTACK: +00113 value_ += attackRate_; +00114 if ( value_ >= target_ ) { +00115 value_ = target_; +00116 target_ = sustainLevel_; +00117 state_ = DECAY; +00118 } +00119 lastFrame_[0] = value_; +00120 break; +00121 +00122 case DECAY: +00123 value_ -= decayRate_; +00124 if ( value_ <= sustainLevel_ ) { +00125 value_ = sustainLevel_; +00126 state_ = SUSTAIN; +00127 } +00128 lastFrame_[0] = value_; +00129 break; +00130 +00131 case RELEASE: +00132 value_ -= releaseRate_; +00133 if ( value_ <= 0.0 ) { +00134 value_ = (StkFloat) 0.0; +00135 state_ = DONE; +00136 } +00137 lastFrame_[0] = value_; +00138 +00139 } +00140 +00141 return value_; +00142 } +00143 +00144 inline StkFrames& ADSR :: tick( StkFrames& frames, unsigned int channel ) +00145 { +00146 #if defined(_STK_DEBUG_) +00147 if ( channel >= frames.channels() ) { +00148 errorString_ << "ADSR::tick(): channel and StkFrames arguments are incompatible!"; +00149 handleError( StkError::FUNCTION_ARGUMENT ); +00150 } +00151 #endif +00152 +00153 StkFloat *samples = &frames[channel]; +00154 unsigned int hop = frames.channels(); +00155 for ( unsigned int i=0; i<frames.frames(); i++, samples += hop ) +00156 *samples = ADSR::tick(); +00157 +00158 return frames; +00159 } +00160 +00161 } // stk namespace +00162 +00163 #endif +
| The Synthesis ToolKit in C++ (STK) |
| ©1995-2010 Perry R. Cook and Gary P. Scavone. All Rights Reserved. |