lfo.h

   1 /*
   2   ZynAddSubFX - a software synthesizer
   3
   4   LFO.h - LFO implementation
   5   Copyright (C) 2006,2007,2008,2009 Nedko Arnaudov <nedko@arnaudov.name>
   6   Copyright (C) 2002-2005 Nasca Octavian Paul
   7   Author: Nasca Octavian Paul
   8
   9   This program is free software; you can redistribute it and/or modify
  10   it under the terms of version 2 of the GNU General Public License
  11   as published by the Free Software Foundation.
  12
  13   This program is distributed in the hope that it will be useful,
  14   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16   GNU General Public License (version 2) for more details.
  17
  18   You should have received a copy of the GNU General Public License (version 2)
  19   along with this program; if not, write to the Free Software Foundation,
  20   Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  21
  22 */
  23
  24 #ifndef LFO_H
  25 #define LFO_H
  26
  27 #define ZYN_LFO_TYPE_FREQUENCY     0
  28 #define ZYN_LFO_TYPE_AMPLITUDE     1
  29 #define ZYN_LFO_TYPE_FILTER        2
  30
  31 class LFO
  32 {
  33 public:
  34   LFO();
  35
  36   void
  37   init(
  38     float sample_rate,
  39     float base_frequency,       // note
  40     const struct zyn_lfo_parameters * parameters_ptr,
  41     unsigned int type);         // one of ZYN_LFO_TYPE_XXX
  42
  43   ~LFO();
  44
  45   float lfoout();
  46
  47   float amplfoout();
  48
  49 private:
  50   void computenextincrnd();
  51
  52   float m_x;
  53
  54   float m_incx;
  55   float m_incrnd;
  56   float m_nextincrnd;
  57
  58   // used for randomness
  59   float m_amp1;
  60   float m_amp2;
  61
  62   float m_lfointensity;
  63
  64   bool m_depth_randomness_enabled;
  65   float m_depth_randomness;
  66   bool m_frequency_randomness_enabled;
  67   float m_frequency_randomness;
  68
  69   float m_delay;
  70
  71   char m_shape;
  72
  73   float m_sample_rate;
  74 };
  75
  76 #endif