mirror of
https://github.com/cookiengineer/audacity
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91 lines
2.0 KiB
C++
91 lines
2.0 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 - 2005.
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*/
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/***************************************************/
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#ifndef STK_ADSR_H
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#define STK_ADSR_H
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#include "Envelope.h"
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namespace Nyq
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{
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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(StkFloat rate);
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//! Set the decay rate.
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void setDecayRate(StkFloat rate);
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//! Set the sustain level.
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void setSustainLevel(StkFloat level);
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//! Set the release rate.
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void setReleaseRate(StkFloat rate);
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//! Set the attack rate based on a time duration.
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void setAttackTime(StkFloat time);
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//! Set the decay rate based on a time duration.
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void setDecayTime(StkFloat time);
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//! Set the release rate based on a time duration.
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void setReleaseTime(StkFloat time);
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//! Set sustain level and attack, decay, and release time durations.
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void setAllTimes(StkFloat aTime, StkFloat dTime, StkFloat sLevel, StkFloat rTime);
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//! Set the target value.
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void setTarget(StkFloat target);
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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(StkFloat value);
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protected:
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StkFloat computeSample( void );
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StkFloat attackRate_;
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StkFloat decayRate_;
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StkFloat sustainLevel_;
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StkFloat releaseRate_;
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};
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} // namespace Nyq
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#endif
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