core.h

   1 /*
   2
   3     Ann Hell Ex Machina - Music Software
   4     Copyright (C) 2003/2004 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 CHANNELS
  25 #define CHANNELS        16
  26 #endif
  27
  28 #define NUM_NOTES               128
  29 #define VALID_NOTE(n)           ((n) >= 0 && (n) < NUM_NOTES)
  30
  31 extern int _frequency;
  32 extern int _interpolation;
  33 extern int _n_channels;
  34 extern int _debug;
  35
  36 #define MS2F(ms) ((ms / 1000.0) * _frequency)
  37
  38 #define TIME2SAMPLES(s) ((s) * _frequency)
  39
  40
  41 struct ss_wave
  42 {
  43         double size;            /* size in samples */
  44         int n_channels;         /* # of channels */
  45         float * wave[CHANNELS]; /* the PCM waves */
  46         int s_rate;             /* original sample rate */
  47
  48         double loop_start;      /* start of loop (-1, no loop) */
  49         double loop_end;        /* end of loop */
  50
  51         double base_freq;       /* base frequency */
  52         double min_freq;        /* minimum frequency */
  53         double max_freq;        /* maximum frequency */
  54 };
  55
  56
  57 double note_frequency(int note);
  58 float _get_sample(float * wave, double size, double offset);
  59 float get_sample(struct ss_wave * w, int channel, double offset);
  60 double wave_resample(int freq, double size, int n_channels, float * wave[]);
  61
  62 double tempo_from_wave(struct ss_wave * w, int note, double len);
  63 double pitch_from_wave(struct ss_wave * w, double tempo, double len);
  64
  65 /* dynamic string manipulation macros */
  66 #ifndef ds_init
  67 struct ds { char * d; int p; int s; };
  68 #define ds_init(x) do { x.d=(char *)0; x.p=x.s=0; } while(0)
  69 #define ds_rewind(x) x.p=0;
  70 #define ds_free(x) do { if(x.d) free(x.d); ds_init(x); } while(0)
  71 #define ds_redim(x) do { if(x.p >= x.s) x.d=realloc(x.d, x.s += 32); } while(0)
  72 #define ds_poke(x,c) do { ds_redim(x); x.d[x.p++]=c; } while(0)
  73 #define ds_pokes(x,t) do { char *p=t; while(*p) ds_poke(x, *p++); } while(0)
  74 #endif /* ds_init */