1 /*
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2022 Goran Mekić
5 * Copyright (c) 2024 The FreeBSD Foundation
6 *
7 * Portions of this software were developed by Christos Margiolis
8 * <christos@FreeBSD.org> under sponsorship from the FreeBSD Foundation.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <err.h>
33 #include <fcntl.h>
34 #include <stdio.h>
35 #include <stdlib.h>
36 #include <unistd.h>
37
38 #define CMD_MASK 0xF0
39 #define CHANNEL_MASK 0x0F
40 #define NOTE_ON 0x90
41 #define NOTE_OFF 0x80
42 #define CTL_CHANGE 0xB0
43
44 int
main(int argc,char * argv[])45 main(int argc, char *argv[])
46 {
47 int fd;
48 unsigned char raw, type, channel, b1, b2;
49
50 if ((fd = open("/dev/umidi0.0", O_RDWR)) < 0)
51 err(1, "Error opening MIDI device");
52
53 for (;;) {
54 if (read(fd, &raw, sizeof(raw)) < sizeof(raw))
55 err(1, "Error reading command byte");
56 if (!(raw & 0x80))
57 continue;
58
59 type = raw & CMD_MASK;
60 channel = raw & CHANNEL_MASK;
61
62 if (read(fd, &b1, sizeof(b1)) < sizeof(b1))
63 err(1, "Error reading byte 1");
64 if (read(fd, &b2, sizeof(b2)) < sizeof(b2))
65 err(1, "Error reading byte 2");
66
67 switch (type) {
68 case NOTE_ON:
69 printf("Channel %d, note on %d, velocity %d\n",
70 channel, b1, b2);
71 break;
72 case NOTE_OFF:
73 printf("Channel %d, note off %d, velocity %d\n",
74 channel, b1, b2);
75 break;
76 case CTL_CHANGE:
77 printf("Channel %d, controller change %d, value %d\n",
78 channel, b1, b2);
79 break;
80 default:
81 printf("Unknown event type %d\n", type);
82 break;
83 }
84 }
85
86 close(fd);
87
88 return (0);
89 }
90