envelope.hh

// 
// YASE Echo Module Header
// 
// Copyright (C) 2022 Eric Klavins
// This file is part of YASE
// 
// YASE is free software: you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the Free Software
// Foundation, either version 3 of the License, or (at your option) any later
// version.
//
// YASE is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
// FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
// details.
// 
// You should have received a copy of the GNU General Public License along
// with YASE. If not, see <https://www.gnu.org/licenses/>.
// 
 
#ifndef YASE_ENVELOPE_H
#define YASE_ENVELOPE_H
 
#include "yase.hh"
 
namespace yase {
 
    class Envelope;
 
    typedef  void (Envelope::*UpdateFunction)();  
 
    
    class Envelope : public Triggerable {
 
    public:
 
      Envelope();
      void init();
      void update(); 
      void trigger();
      void release();
      void set_adsr(double aa, double dd, double ss, double rr);
 
    private:
 
      // i/o indices
      int signal, 
          a,d,s,r, 
          velocity;
 
      UpdateFunction update_fcn;
 
      double amplitude;
 
      void off();
      void attack();
      void decay();
      void sustain();
      void _release();          
 
    };
 
}
 
#endif