git: f092c21bf630 - main - snd_uaudio(4): Add some examples accessing USB MIDI devices.
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Date: Tue, 27 Sep 2022 18:05:41 UTC
The branch main has been updated by hselasky:
URL: https://cgit.FreeBSD.org/src/commit/?id=f092c21bf630543dc899a444fa7885d0bbbaedfd
commit f092c21bf630543dc899a444fa7885d0bbbaedfd
Author: Goran Mekic <meka@tilda.center>
AuthorDate: 2022-09-27 17:28:27 +0000
Commit: Hans Petter Selasky <hselasky@FreeBSD.org>
CommitDate: 2022-09-27 18:04:14 +0000
snd_uaudio(4): Add some examples accessing USB MIDI devices.
Differential Revision: https://reviews.freebsd.org/D36195
MFC after: 1 week
Sponsored by: NVIDIA Networking
---
share/examples/Makefile | 2 ++
share/examples/sound/midi.c | 76 ++++++++++++++++++++++++++++++++++++++++++
share/examples/sound/ossmidi.h | 63 ++++++++++++++++++++++++++++++++++
3 files changed, 141 insertions(+)
diff --git a/share/examples/Makefile b/share/examples/Makefile
index 1d916f344b77..7179f1bff1a4 100644
--- a/share/examples/Makefile
+++ b/share/examples/Makefile
@@ -320,6 +320,8 @@ SE_DIRS+= sound
SE_SOUND= \
basic.c \
ossinit.h \
+ ossmidi.h \
+ midi.c \
README
SE_DIRS+= sunrpc
diff --git a/share/examples/sound/midi.c b/share/examples/sound/midi.c
new file mode 100644
index 000000000000..fbe4d9480530
--- /dev/null
+++ b/share/examples/sound/midi.c
@@ -0,0 +1,76 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2022 Goran Mekić
+ *
+ * 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 <unistd.h>
+
+#include "ossmidi.h"
+
+int
+main()
+{
+ midi_event_t event;
+ midi_config_t midi_config;
+ int l = -1;
+ unsigned char raw;
+
+ midi_config.device = "/dev/umidi1.0";
+ oss_midi_init(&midi_config);
+
+ while ((l = read(midi_config.fd, &raw, sizeof(raw))) != -1) {
+ if (!(raw & 0x80)) {
+ continue;
+ }
+ event.type = raw & CMD_MASK;
+ event.channel = raw & CHANNEL_MASK;
+ switch (event.type) {
+ case NOTE_ON:
+ case NOTE_OFF:
+ case CONTROLER_ON:
+ if ((l = read(midi_config.fd, &(event.note), sizeof(event.note))) == -1) {
+ perror("Error reading MIDI note");
+ exit(1);
+ }
+ if ((l = read(midi_config.fd, &(event.velocity), sizeof(event.velocity))) == -1) {
+ perror("Error reading MIDI velocity");
+ exit(1);
+ }
+ break;
+ }
+ switch (event.type) {
+ case NOTE_ON:
+ case NOTE_OFF:
+ printf("Channel %d, note %d, velocity %d\n", event.channel, event.note, event.velocity);
+ break;
+ case CONTROLER_ON:
+ printf("Channel %d, controller %d, value %d\n", event.channel, event.controller, event.value);
+ break;
+ default:
+ printf("Unknown event type %d\n", event.type);
+ }
+ }
+ return 0;
+}
diff --git a/share/examples/sound/ossmidi.h b/share/examples/sound/ossmidi.h
new file mode 100644
index 000000000000..507508061de4
--- /dev/null
+++ b/share/examples/sound/ossmidi.h
@@ -0,0 +1,63 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2022 Goran Mekić
+ *
+ * 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 <stdlib.h>
+#include <stdio.h>
+#include <fcntl.h>
+
+#define CMD_MASK 0xF0
+#define NOTE_ON 0x90
+#define NOTE_OFF 0x80
+#define CHANNEL_MASK 0xF
+#define CONTROLER_ON 0xB0
+
+typedef struct midi_event {
+ unsigned char type;
+ unsigned char channel;
+ union {
+ unsigned char note;
+ unsigned controller;
+ };
+ union {
+ unsigned char velocity;
+ unsigned char value;
+ };
+} midi_event_t;
+
+typedef struct midi_config {
+ char *device;
+ int fd;
+} midi_config_t;
+
+void
+oss_midi_init(midi_config_t *config)
+{
+ if ((config->fd = open(config->device, O_RDWR)) == -1) {
+ perror("Error opening MIDI device");
+ exit(1);
+ }
+}