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 process_MIDI(void)
  76 {
  77         /* strip MIDI channel */
  78         midimsg[0] &= 0xf0;
  79
  80         if(midimsg[0] == MIDI_NOTE_OFF)
  81                 ss_ins_note_off(&i, midimsg[1]);
  82         else
  83         if(midimsg[0] == MIDI_NOTE_ON)
  84                 ss_ins_note_on(&i, midimsg[1],
  85                         ((float)midimsg[2]) / 127.0, midimsg[1]);
  86
  87         i_msg=0;
  88 }
  89
  90
  91 void midiin(void)
  92 {
  93         unsigned char midibuf[128];
  94         int c, n;
  95         float sample[2];
  96
  97         for(;;)
  98         {
  99                 /* read from MIDI device */
 100                 c=read(_midi_fd, midibuf, sizeof(midibuf));
 101
 102                 if(c > 0)
 103                 {
 104                         for(n=0;n < c;n++)
 105                         {
 106                                 /* if 7bit of input is set,
 107                                    it's a start of MIDI message */
 108                                 if((midibuf[n] & 0x80) && i_msg)
 109                                         process_MIDI();
 110
 111                                 midimsg[i_msg++]=midibuf[n];
 112                         }
 113                 }
 114
 115                 ss_output_init_frame(sample);
 116                 ss_ins_frame(&i, sample);
 117                 ss_output_write(sample);
 118         }
 119 }
 120
 121
 122 int main(int argc, char * argv[])
 123 {
 124         ss_interpolation=1;
 125         ss_frequency=44100;
 126         ss_master_volume=1;
 127         ss_nchannels=2;
 128
 129         if(argc == 0)
 130         {
 131                 printf("Usage:\n");
 132                 printf("midiin [instrument.pat] [midi device]\n");
 133                 return(1);
 134         }
 135
 136         if(argc > 1)
 137                 strcpy(_pat_instrument, argv[1]);
 138
 139         if(argc > 2)
 140                 strcpy(_midi_dev, argv[2]);
 141
 142         /* loads the instrument or bangs */
 143         ss_ins_init(&i, 0);
 144         if(ss_load_pat_file(&i, _pat_instrument) < 0)
 145         {
 146                 printf("Error loading '%s'\n", _pat_instrument);
 147                 return(2);
 148         }
 149
 150         /* opens the ahxm output driver */
 151         if(ss_output_open("default", NULL) < 0)
 152         {
 153                 printf("Error opening ahxm output driver\n");
 154                 return(4);
 155         }
 156
 157         /* opens the MIDI channel */
 158         if((_midi_fd=open(_midi_dev, O_RDONLY|O_NONBLOCK))==-1)
 159         {
 160                 printf("Error opening midi device '%s'\n", _midi_dev);
 161                 return(3);
 162         }
 163
 164         midiin();
 165
 166         ss_output_close();
 167
 168         return(0);
 169 }