instrument.h

   1 /*
   2
   3     PROGRAM_NAME PROGRAM_VERSION - PROGRAM_DESCRIPTION
   4
   5     Copyright (C) 2003 Angel Ortega <angel@triptico.com>
   6
   7     This program is free software; you can redistribute it and/or
   8     modify it under the terms of the GNU General Public License
   9     as published by the Free Software Foundation; either version 2
  10     of the License, or (at your option) any later version.
  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 for more details.
  16
  17     You should have received a copy of the GNU General Public License
  18     along with this program; if not, write to the Free Software
  19     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  20
  21     http://www.triptico.com
  22
  23 */
  24
  25 #define NUM_NOTES               128
  26 #define VALID_NOTE(n)           ((n) >= 0 && (n) < NUM_NOTES)
  27
  28 #define LAYERS_PER_INSTR        32
  29 #define GENERATORS_PER_INSTR    32
  30
  31 struct layer
  32 {
  33         int base_note;          /* base note */
  34         int min_note;           /* minimum note */
  35         int max_note;           /* maximum note */
  36         float * lwave;          /* left channel wave */
  37         float * rwave;          /* right channel wave */
  38         int size;               /* size in samples */
  39         int loop_start;         /* start of loop (-1, no loop) */
  40         int loop_end;           /* end of loop */
  41         int sustain;            /* sustain in samples */
  42 };
  43
  44
  45 struct instrument
  46 {
  47         struct layer layers[LAYERS_PER_INSTR];                  /* layers */
  48         int n_layers;                                           /* # of layers */
  49         struct generator generators[GENERATORS_PER_INSTR];      /* generators */
  50
  51         int note_gen[NUM_NOTES];                                /* generator for note */
  52 };
  53
  54
  55 void build_note_frequencies(void);
  56
  57 void init_instrument(struct instrument * i);
  58
  59 int add_instrument_layer(struct instrument * i, int base_note,
  60         int min_note, int max_note, float * lwave, float * rwave,
  61         int size, int loop_start, int loop_end, int sustain);
  62
  63 int instrument_play_note(struct instrument * i, int note, float lvol, float rvol);
  64 int instrument_release_note(struct instrument * i, int note);
  65
  66 void generate_instrument(struct instrument * i, float * lsample, float * rsample);