midiin.c

   1 /*
   2
   3     Ann Hell Ex Machina - Music Software
   4     Copyright (C) 2003/2007 Angel Ortega <angel@triptico.com>
   5
   6     midiin.c - Code for testing the libraries
   7
   8     This program is free software; you can redistribute it and/or
   9     modify it under the terms of the GNU General Public License
  10     as published by the Free Software Foundation; either version 2
  11     of the License, or (at your option) any later version.
  12
  13     This program is distributed in the hope that it will be useful,
  14     but WITHOUT ANY WARRANTY; without even the implied warranty of
  15     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16     GNU General Public License for more details.
  17
  18     You should have received a copy of the GNU General Public License
  19     along with this program; if not, write to the Free Software
  20     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  21
  22     http://www.triptico.com
  23
  24 */
  25
  26 #include "config.h"
  27
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <unistd.h>
  31 #include <string.h>
  32 #include <sys/types.h>
  33 #include <sys/stat.h>
  34 #include <fcntl.h>
  35 #include <math.h>
  36
  37 #include "ahxm.h"
  38
  39 /*******************
  40         Data
  41 ********************/
  42
  43 #define MIDI_NOTE_OFF   0x80
  44 #define MIDI_NOTE_ON    0x90
  45 #define MIDI_AFTERTOUCH 0xA0
  46 #define MIDI_PARAMETER  0xB0
  47 #define MIDI_PROGRAM    0xC0
  48 #define MIDI_PRESSURE   0xD0
  49 #define MIDI_PITCHWHEEL 0xE0
  50 #define MIDI_SYSEX      0xF0
  51 #define MIDI_EOX        0xf7
  52
  53 /* MIDI device */
  54 char midi_dev[150] = "/dev/midi";
  55 int midi_fd = -1;
  56
  57 /* instrument */
  58 char instrument[150] = "samples/acpiano.pat";
  59
  60 /* the MIDI message */
  61 unsigned char midimsg[128];
  62 int i_msg = 0;
  63
  64 /* use the instruments in ss_ins */
  65 extern struct ss_ins ss_song_ins[256];
  66
  67 /*******************
  68         Code
  69 ********************/
  70
  71 void print_note(int note)
  72 {
  73         static int octave = -1;
  74         int o, d, n;
  75         char *notestr[] = {
  76                 "c", "c#", "d", "d#", "e", "f",
  77                 "f#", "g", "g#", "a", "a#", "b"
  78         };
  79
  80         o = note / 12;
  81         n = note % 12;
  82
  83         if (octave == -1 || (d = (octave - o)) > 1 || d < -1) {
  84                 /* first time or octave too far; set it */
  85                 octave = o;
  86                 printf("o%d ", o);
  87                 d = 0;
  88         }
  89
  90         printf("%s%s ", notestr[n], (d == -1 ? "'" : (d == 1 ? "," : "")));
  91
  92         fflush(stdout);
  93 }
  94
  95
  96 void process_MIDI(void)
  97 {
  98         /* strip MIDI channel */
  99         midimsg[0] &= 0xf0;
 100
 101         if (midimsg[0] == MIDI_NOTE_OFF)
 102                 ss_ins_note_off(&ss_song_ins[0], midimsg[1]);
 103         else if (midimsg[0] == MIDI_NOTE_ON) {
 104                 ss_ins_note_on(&ss_song_ins[0], midimsg[1],
 105                                ((float) midimsg[2]) / 127.0, midimsg[1]);
 106
 107                 print_note(midimsg[1]);
 108         }
 109
 110         i_msg = 0;
 111 }
 112
 113
 114 void midiin(void)
 115 {
 116         unsigned char midibuf[128];
 117         int c, n;
 118         sample_t sample[2];
 119
 120         for (;;) {
 121                 /* read from MIDI device */
 122                 c = read(midi_fd, midibuf, sizeof(midibuf));
 123
 124                 if (c > 0) {
 125                         for (n = 0; n < c; n++) {
 126                                 /* if 7bit of input is set,
 127                                    it's a start of MIDI message */
 128                                 if ((midibuf[n] & 0x80) && i_msg)
 129                                         process_MIDI();
 130
 131                                 midimsg[i_msg++] = midibuf[n];
 132                         }
 133                 }
 134
 135                 ss_output_init_frame(sample);
 136                 ss_ins_frame(&ss_song_ins[0], sample);
 137                 ss_output_write(sample);
 138         }
 139 }
 140
 141
 142 int main(int argc, char *argv[])
 143 {
 144         char *ext;
 145
 146         ss_interpolation = 1;
 147         ss_frequency = 44100;
 148         ss_master_volume = 1;
 149         ss_nchannels = 2;
 150
 151         libpath_add("~/ahxmlib", 0);
 152
 153         /* default converters */
 154         transconv_add(".flac", ".wav", "flac -d -s -o '%s' '%s'");
 155         transconv_add(".mp3", ".wav", "mpg321 -q -w '%s' '%s'");
 156
 157         if (argc == 0) {
 158                 printf("Usage:\n");
 159                 printf("midiin [instrument.pat] [midi device]\n");
 160                 return 1;
 161         }
 162
 163         if (argc > 1)
 164                 strcpy(instrument, argv[1]);
 165
 166         if (argc > 2)
 167                 strcpy(midi_dev, argv[2]);
 168
 169         ss_gen_init();
 170
 171         /* loads the instrument or bangs */
 172         ss_ins_init(&ss_song_ins[0]);
 173
 174         if ((ext = strchr(instrument, '.')) == NULL) {
 175                 printf("The instrument '%s' doesn't have an extension\n", instrument);
 176                 return 2;
 177         }
 178
 179         if (strcmp(ext, ".pat") == 0 || strcmp(ext, ".PAT") == 0) {
 180                 if (ss_load_pat_file(&ss_song_ins[0], instrument) < 0) {
 181                         printf("Error loading '%s'\n", instrument);
 182                         return 2;
 183                 }
 184         }
 185         else {
 186                 if (compile_ahs(instrument))
 187                         return 2;
 188
 189                 if (ss_song_render(0, "default", NULL))
 190                         return 4;
 191         }
 192
 193         /* opens the MIDI channel */
 194         if ((midi_fd = open(midi_dev, O_RDONLY | O_NONBLOCK)) == -1) {
 195                 printf("Error opening midi device '%s'\n", midi_dev);
 196                 return 3;
 197         }
 198
 199         midiin();
 200
 201         ss_output_close();
 202
 203         return 0;
 204 }