mirror of
https://github.com/thestk/stk
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89 lines
2.3 KiB
C++
89 lines
2.3 KiB
C++
/***************************************************/
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/*! \class ADSR
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\brief STK ADSR envelope class.
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This Envelope subclass implements a
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traditional ADSR (Attack, Decay,
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Sustain, Release) envelope. It
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responds to simple keyOn and keyOff
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messages, keeping track of its state.
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The \e state = ADSR::DONE after the
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envelope value reaches 0.0 in the
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ADSR::RELEASE state.
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by Perry R. Cook and Gary P. Scavone, 1995 - 2002.
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*/
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/***************************************************/
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#if !defined(__ADSR_H)
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#define __ADSR_H
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#include "Envelope.h"
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class ADSR : public Envelope
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{
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public:
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//! Envelope states.
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enum { ATTACK, DECAY, SUSTAIN, RELEASE, DONE };
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//! Default constructor.
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ADSR(void);
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//! Class destructor.
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~ADSR(void);
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//! Set target = 1, state = \e ADSR::ATTACK.
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void keyOn(void);
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//! Set target = 0, state = \e ADSR::RELEASE.
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void keyOff(void);
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//! Set the attack rate.
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void setAttackRate(MY_FLOAT aRate);
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//! Set the decay rate.
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void setDecayRate(MY_FLOAT aRate);
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//! Set the sustain level.
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void setSustainLevel(MY_FLOAT aLevel);
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//! Set the release rate.
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void setReleaseRate(MY_FLOAT aRate);
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//! Set the attack rate based on a time duration.
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void setAttackTime(MY_FLOAT aTime);
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//! Set the decay rate based on a time duration.
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void setDecayTime(MY_FLOAT aTime);
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//! Set the release rate based on a time duration.
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void setReleaseTime(MY_FLOAT aTime);
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//! Set sustain level and attack, decay, and release state rates based on time durations.
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void setAllTimes(MY_FLOAT aTime, MY_FLOAT dTime, MY_FLOAT sLevel, MY_FLOAT rTime);
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//! Set the target value.
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void setTarget(MY_FLOAT aTarget);
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//! Return the current envelope \e state (ATTACK, DECAY, SUSTAIN, RELEASE, DONE).
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int getState(void) const;
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//! Set to state = ADSR::SUSTAIN with current and target values of \e aValue.
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void setValue(MY_FLOAT aValue);
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//! Return one envelope output value.
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MY_FLOAT tick(void);
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//! Return \e vectorSize envelope outputs in \e vector.
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MY_FLOAT *tick(MY_FLOAT *vector, unsigned int vectorSize);
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protected:
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MY_FLOAT attackRate;
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MY_FLOAT decayRate;
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MY_FLOAT sustainLevel;
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MY_FLOAT releaseRate;
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};
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#endif
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