ADSR.h

/***************************************************************************************************
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            fantastic  spatial  holophonic               synthesis    tool    kit
 
                                    copyright (c) fabian hummel
                                       www.github.com/fshstk
                                           www.fshstk.com
 
         this file is part of the fantastic spatial holophonic synthesis toolkit (fsh::stk)
  fsh::stk is free software: it is provided under the terms of the gnu general public license v3.0
                                    www.gnu.org/licenses/gpl-3.0
***************************************************************************************************/
 
#pragma once
#include "EnvelopeFollower.h"
 
namespace fsh::synth
{
class ADSR
{
public:
  struct Params
  {
    double attack;  
    double decay;   
    double sustain; 
    double release; 
  };
 
  void setSampleRate(double);
 
  void setParams(const Params&);
 
  auto isActive() const -> bool;
 
  auto getNextValue() -> double;
 
  void noteOn();
 
  void noteOff();
 
  void reset();
 
private:
  enum class Phase
  {
    Idle,
    Attack,
    Decay,
    Sustain,
    Release,
  };
 
  Params _params;
  Phase _phase;
  util::EnvelopeFollower _env;
 
  void updateEnvelope();
};
} // namespace fsh::synth