midiin.c

   1 /*
   2
   3     Ann Hell Ex Machina - Music Software
   4     Copyright (C) 2003/2005 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 "ss_core.h"
  38 #include "ss_output.h"
  39 #include "ss_gen.h"
  40 #include "ss_ins.h"
  41 #include "ss_input.h"
  42
  43 /*******************
  44         Data
  45 ********************/
  46
  47 #define MIDI_NOTE_OFF   0x80
  48 #define MIDI_NOTE_ON    0x90
  49 #define MIDI_AFTERTOUCH 0xA0
  50 #define MIDI_PARAMETER  0xB0
  51 #define MIDI_PROGRAM    0xC0
  52 #define MIDI_PRESSURE   0xD0
  53 #define MIDI_PITCHWHEEL 0xE0
  54 #define MIDI_SYSEX      0xF0
  55 #define MIDI_EOX        0xf7
  56
  57 /* MIDI device */
  58 char midi_dev[150]="/dev/midi";
  59 int midi_fd=-1;
  60
  61 /* PAT instrument */
  62 char pat_instrument[150]="samples/acpiano.pat";
  63
  64 /* the instrument */
  65 struct ss_ins i;
  66
  67 /* the MIDI message */
  68 unsigned char midimsg[128];
  69 int i_msg=0;
  70
  71 /*******************
  72         Code
  73 ********************/
  74
  75 void print_note(int note)
  76 {
  77         static int octave = -1;
  78         int o, d, n;
  79         char * notestr[] = {
  80                 "c", "c#", "d", "d#", "e", "f",
  81                 "f#", "g", "g#", "a", "a#", "b"
  82         };
  83
  84         o=note / 12;
  85         n=note % 12;
  86
  87         if(octave == -1 || (d=abs(octave - o)) > 1)
  88         {
  89                 /* first time or octave too far; set it */
  90                 octave=o;
  91                 printf("o%d ", o);
  92                 d=0;
  93         }
  94
  95         printf("%s%s ", notestr[n], (d == 1 ? "'" : (d == -1 ? "," : "")));
  96
  97         fflush(stdout);
  98 }
  99
 100
 101 void process_MIDI(void)
 102 {
 103         /* strip MIDI channel */
 104         midimsg[0] &= 0xf0;
 105
 106         if(midimsg[0] == MIDI_NOTE_OFF)
 107                 ss_ins_note_off(&i, midimsg[1]);
 108         else
 109         if(midimsg[0] == MIDI_NOTE_ON)
 110         {
 111                 ss_ins_note_on(&i, midimsg[1],
 112                         ((float)midimsg[2]) / 127.0, midimsg[1]);
 113
 114                 print_note(midimsg[1]);
 115         }
 116
 117         i_msg=0;
 118 }
 119
 120
 121 void midiin(void)
 122 {
 123         unsigned char midibuf[128];
 124         int c, n;
 125         float sample[2];
 126
 127         for(;;)
 128         {
 129                 /* read from MIDI device */
 130                 c=read(midi_fd, midibuf, sizeof(midibuf));
 131
 132                 if(c > 0)
 133                 {
 134                         for(n=0;n < c;n++)
 135                         {
 136                                 /* if 7bit of input is set,
 137                                    it's a start of MIDI message */
 138                                 if((midibuf[n] & 0x80) && i_msg)
 139                                         process_MIDI();
 140
 141                                 midimsg[i_msg++]=midibuf[n];
 142                         }
 143                 }
 144
 145                 ss_output_init_frame(sample);
 146                 ss_ins_frame(&i, sample);
 147                 ss_output_write(sample);
 148         }
 149 }
 150
 151
 152 int main(int argc, char * argv[])
 153 {
 154         ss_interpolation=1;
 155         ss_frequency=44100;
 156         ss_master_volume=1;
 157         ss_nchannels=2;
 158
 159         if(argc == 0)
 160         {
 161                 printf("Usage:\n");
 162                 printf("midiin [instrument.pat] [midi device]\n");
 163                 return(1);
 164         }
 165
 166         if(argc > 1)
 167                 strcpy(pat_instrument, argv[1]);
 168
 169         if(argc > 2)
 170                 strcpy(midi_dev, argv[2]);
 171
 172         /* loads the instrument or bangs */
 173         ss_ins_init(&i);
 174         if(ss_load_pat_file(&i, pat_instrument) < 0)
 175         {
 176                 printf("Error loading '%s'\n", pat_instrument);
 177                 return(2);
 178         }
 179
 180         /* opens the ahxm output driver */
 181         if(ss_output_open("default", NULL) < 0)
 182         {
 183                 printf("Error opening ahxm output driver\n");
 184                 return(4);
 185         }
 186
 187         /* opens the MIDI channel */
 188         if((midi_fd=open(midi_dev, O_RDONLY|O_NONBLOCK))==-1)
 189         {
 190                 printf("Error opening midi device '%s'\n", midi_dev);
 191                 return(3);
 192         }
 193
 194         midiin();
 195
 196         ss_output_close();
 197
 198         return(0);
 199 }