envelope.h

   1 /*
   2   ZynAddSubFX - a software synthesizer
   3
   4   Envelope.h - Envelope implementation
   5   Copyright (C) 2002-2005 Nasca Octavian Paul
   6   Author: Nasca Octavian Paul
   7
   8   This program is free software; you can redistribute it and/or modify
   9   it under the terms of version 2 of the GNU General Public License
  10   as published by the Free Software Foundation.
  11
  12   This program is distributed in the hope that it will be useful,
  13   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15   GNU General Public License (version 2) for more details.
  16
  17   You should have received a copy of the GNU General Public License (version 2)
  18   along with this program; if not, write to the Free Software Foundation,
  19   Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  20
  21 */
  22
  23 #ifndef ENVELOPE_H
  24 #define ENVELOPE_H
  25
  26 class Envelope
  27 {
  28 public:
  29   Envelope();
  30   ~Envelope();
  31
  32   void
  33   init(
  34     float sample_rate,
  35     EnvelopeParams * envpars,
  36     float basefreq);
  37
  38   void relasekey();
  39
  40   float envout();
  41   float envout_dB();
  42
  43   bool finished();               // returns whether envelope has finished or not
  44
  45 private:
  46   int envpoints;
  47   int envsustain;               // "-1" means disabled
  48   float envdt[MAX_ENVELOPE_POINTS]; // millisecons
  49   float envval[MAX_ENVELOPE_POINTS]; // [0.0 .. 1.0]
  50   float m_stretch;
  51   bool m_linear;
  52
  53   int currentpoint;             // current envelope point (starts from 1)
  54   bool m_forced_release;
  55   bool m_key_released;          // whether the key was released or not
  56   bool m_finished;              // whether envelope has finished or not
  57   float t;                      // the time from the last point
  58   float inct;                   // the time increment
  59   float envoutval;              // used to do the forced release
  60 };
  61
  62 #endif
  63
  64