ss_core.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_MAX_CHANNELS
  25 #define SS_MAX_CHANNELS 16
  26 #endif
  27
  28 extern int ss_frequency;
  29 extern int ss_interpolation;
  30 extern int ss_nchannels;
  31 extern int ss_debug;
  32
  33 #define MS2F(ms) ((ms / 1000.0) * ss_frequency)
  34
  35 struct ss_wave
  36 {
  37         double size;            /* size in frames */
  38         int n_channels;         /* # of channels */
  39         float ** wave;          /* the PCM waves */
  40         int s_rate;             /* original sample rate */
  41
  42         double loop_start;      /* start of loop (-1, no loop) */
  43         double loop_end;        /* end of loop */
  44
  45         double base_freq;       /* base frequency */
  46         double min_freq;        /* minimum frequency */
  47         double max_freq;        /* maximum frequency */
  48 };
  49
  50
  51 double ss_note_frequency(int note);
  52 struct ss_wave * ss_alloc_wave(int size, int n_channels, int s_rate);
  53
  54 float ss_get_sample(float * wave, double size, double offset);
  55
  56 double ss_tempo_from_wave(struct ss_wave * w, int note, double len);
  57 double ss_pitch_from_tempo(struct ss_wave * w, double tempo, double len);