ss_gen.h

   1 /*
   2
   3     Ann Hell Ex Machina - Music Software
   4     Copyright (C) 2003/2005 Angel Ortega <angel@triptico.com>
   5
   6     This program is free software; you can redistribute it and/or
   7     modify it under the terms of the GNU General Public License
   8     as published by the Free Software Foundation; either version 2
   9     of the License, or (at your option) any later version.
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program; if not, write to the Free Software
  18     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  19
  20     http://www.triptico.com
  21
  22 */
  23
  24 #ifndef SS_GEN_NUM
  25 #define SS_GEN_NUM      256
  26 #endif
  27
  28 struct ss_gen
  29 {
  30         int note_id;            /* note ID */
  31         float vol;              /* volume */
  32         struct ss_wave * w;     /* the wave data */
  33
  34         double cursor;          /* offset to next sample */
  35         double inc;             /* increment (frequency) */
  36
  37         int sustain;            /* number of frames to play after release */
  38         float dvol;             /* volume decrement in sustain */
  39
  40         double vibrato;         /* vibrato oscillator */
  41         double vib_depth;       /* vibrato depth */
  42         double vib_inc;         /* increment for vibrato oscillator */
  43
  44         double portamento;      /* portamento sum to inc */
  45
  46         struct ss_gen * next;
  47         struct ss_gen * prev;
  48 };
  49
  50
  51 struct ss_gen * ss_gen_alloc(struct ss_gen ** q);
  52 void ss_gen_free(struct ss_gen ** q, struct ss_gen * g);
  53
  54 void ss_gen_sustain(struct ss_gen * g, double sustain);
  55 void ss_gen_vibrato(struct ss_gen * g, double depth, double freq);
  56
  57 void ss_gen_play(struct ss_gen * g, double freq, float vol, int note_id,
  58         struct ss_wave * w);
  59
  60 void ss_gen_release(struct ss_gen * g);
  61
  62 int ss_gen_frame(struct ss_gen * g, int n_channels, float frame[]);
  63