EnvelopeFollower.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
 
namespace fsh::util
{
class EnvelopeFollower
{
public:
  struct Params
  {
    double attackTimeMilliseconds = 5.0;  
    double releaseTimeMilliseconds = 5.0; 
  };
 
  auto getNextValue() -> double;
 
  void setTargetValue(double);
 
  void setSampleRate(double);
 
  void setParams(const Params&);
 
  void reset(double val = 0.0);
 
private:
  void calculateCoefficients();
 
  Params _params;
 
  double _coeffAttack = 1.0;
  double _coeffRelease = 1.0;
 
  double _currentValue = 0.0;
  double _targetValue = 0.0;
 
  double _sampleRate;
};
} // namespace fsh::util