wav.c

   1 /*
   2
   3     wav.c
   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 #include "config.h"
  26
  27 #include <stdio.h>
  28 #include <string.h>
  29 #include <stdlib.h>
  30 #include <math.h>
  31
  32 #include "input.h"
  33 #include "output.h"
  34 #include "generator.h"
  35 #include "instrument.h"
  36
  37 /*******************
  38         Data
  39 ********************/
  40
  41 /* main output frequency */
  42 int _frequency=44100;
  43
  44 struct channel
  45 {
  46         int * wave;
  47         double vol;
  48         double dvol;
  49 };
  50
  51
  52 #define NUM_GENERATORS 64
  53 struct generator _generators[NUM_GENERATORS];
  54
  55
  56 struct effect_delay
  57 {
  58         int * lbuffer;
  59         int * rbuffer;
  60         int size;
  61         double vol;
  62         int cursor;
  63 };
  64
  65
  66 /*******************
  67         Code
  68 ********************/
  69
  70 #define TIME2SAMPLES(s) ((s) * _frequency)
  71
  72 void init_delay(struct effect_delay * e, int size, double vol)
  73 {
  74         /* free previously allocated buffer */
  75 /*      if(e->lbuffer != NULL) free(e->lbuffer);
  76         if(e->rbuffer != NULL) free(e->rbuffer);
  77 */
  78         e->lbuffer=(int *) malloc(size * sizeof(int));
  79         memset(e->lbuffer, '\0', size * sizeof(int));
  80         e->rbuffer=(int *) malloc(size * sizeof(int));
  81         memset(e->rbuffer, '\0', size * sizeof(int));
  82
  83         e->size=size;
  84         e->vol=vol;
  85         e->cursor=0;
  86 }
  87
  88
  89 void process_delay(struct effect_delay * e, int * lsample, int * rsample)
  90 {
  91         int l,r;
  92
  93         l=e->lbuffer[e->cursor];
  94         r=e->lbuffer[e->cursor];
  95
  96         l=*lsample + (int)(e->vol * (double)l);
  97         r=*rsample + (int)(e->vol * (double)r);
  98
  99         e->lbuffer[e->cursor]=*lsample;
 100         e->rbuffer[e->cursor]=*rsample;
 101
 102         if(++e->cursor == e->size) e->cursor=0;
 103
 104         *lsample=l;
 105         *rsample=r;
 106 }
 107
 108
 109 void process_reverb(struct effect_delay * e, int * lsample, int * rsample)
 110 {
 111         int l,r;
 112
 113         l=e->lbuffer[e->cursor];
 114         r=e->lbuffer[e->cursor];
 115
 116         e->lbuffer[e->cursor]=*lsample + (int)(e->vol * (double)l);
 117         e->rbuffer[e->cursor]=*rsample + (int)(e->vol * (double)r);
 118
 119         l+=*lsample;
 120         r+=*rsample;
 121
 122         if(++e->cursor == e->size) e->cursor=0;
 123
 124         *lsample=l;
 125         *rsample=r;
 126 }
 127
 128
 129 int main(void)
 130 {
 131         int * ls;
 132         int * rs;
 133         int size;
 134         FILE * f;
 135         int n, m;
 136         struct effect_delay e;
 137
 138         memset(_generators, '\0', sizeof(_generators));
 139         build_note_frequencies();
 140
 141         load_wav_file("samples/amen1.wav", &size, &ls, &rs);
 142
 143         generator_play(&_generators[0], ls, rs, size, 1, 0, size, 0.2, 1, 4410);
 144
 145         load_wav_file("samples/01c1.wav", &size, &ls, &rs);
 146         generator_play(&_generators[1], ls, rs, size,
 147                 _note_freq[24] / _note_freq[36], 0, size, 1, 1, 44100 / 3);
 148
 149         load_wav_file("samples/05c3.wav", &size, &ls, &rs);
 150
 151         generator_play(&_generators[2], ls, rs, size,
 152                 _note_freq[36] / _note_freq[36], 0, size, 0.5, 0.5, 0);
 153
 154         generator_play(&_generators[3], ls, rs, size,
 155                 _note_freq[39] / _note_freq[36], 0, size, 0.5, 0.5, 0);
 156
 157         generator_play(&_generators[4], ls, rs, size,
 158                 _note_freq[43] / _note_freq[36], 0, size, 0.5, 0.5, 0);
 159
 160         load_wav_file("samples/as-al017.wav", &size, &ls, &rs);
 161         generator_play(&_generators[5], ls, rs, size, 1, 0, size, 2, 2, 0);
 162
 163 /*
 164         f=popen("sox -V -t raw -s -r 44100 -c 2 -w - qq.wav","w");
 165 */
 166
 167         if(output_open("oss", "/dev/dsp") < 0)
 168         {
 169                 printf("Error: can't init driver\n");
 170                 return(1);
 171         }
 172
 173         init_delay(&e, 44100 / 10, 0.5);
 174
 175         for(n=TIME2SAMPLES(15);n > 0;n--)
 176         {
 177                 int l,r;
 178
 179                 l=r=0;
 180
 181                 for(m=0;m < NUM_GENERATORS;m++)
 182                         generator(&_generators[m], &l, &r);
 183
 184                 if(n < TIME2SAMPLES(13))
 185                         process_reverb(&e, &l, &r);
 186
 187                 output_write(l, r);
 188
 189 /*              if(n < TIME2SAMPLES(14))
 190                         generator_release(&_generators[1]); */
 191         }
 192
 193         output_close();
 194
 195         return(0);
 196 }