1 files changed, 89 insertions, 0 deletions
diff --git a/share/examples/sound/midi.c b/share/examples/sound/midi.c
new file mode 100644
index 000000000000..5b001ba537e5
--- /dev/null
+++ b/share/examples/sound/midi.c
@@ -0,0 +1,89 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2022 Goran Mekić
+ * Copyright (c) 2024 The FreeBSD Foundation
+ *
+ * Portions of this software were developed by Christos Margiolis
+ * <christos@FreeBSD.org> under sponsorship from the FreeBSD Foundation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <err.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#define CMD_MASK	0xF0
+#define CHANNEL_MASK	0x0F
+#define NOTE_ON		0x90
+#define NOTE_OFF	0x80
+#define CTL_CHANGE	0xB0
+
+int
+main(int argc, char *argv[])
+{
+	int fd;
+	unsigned char raw, type, channel, b1, b2;
+
+	if ((fd = open("/dev/umidi0.0", O_RDWR)) < 0)
+		err(1, "Error opening MIDI device");
+
+	for (;;) {
+		if (read(fd, &raw, sizeof(raw)) < sizeof(raw))
+			err(1, "Error reading command byte");
+		if (!(raw & 0x80))
+			continue;
+
+		type = raw & CMD_MASK;
+		channel = raw & CHANNEL_MASK;
+
+		if (read(fd, &b1, sizeof(b1)) < sizeof(b1))
+			err(1, "Error reading byte 1");
+		if (read(fd, &b2, sizeof(b2)) < sizeof(b2))
+			err(1, "Error reading byte 2");
+
+		switch (type) {
+		case NOTE_ON:
+			printf("Channel %d, note on %d, velocity %d\n",
+			    channel, b1, b2);
+			break;
+		case NOTE_OFF:
+			printf("Channel %d, note off %d, velocity %d\n",
+			    channel, b1, b2);
+			break;
+		case CTL_CHANGE:
+			printf("Channel %d, controller change %d, value %d\n",
+			    channel, b1, b2);
+			break;
+		default:
+			printf("Unknown event type %d\n", type);
+			break;
+		}
+	}
+	
+	close(fd);
+
+	return (0);
+}