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snd_uaudio(4): Add some examples accessing USB MIDI devices.

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Differential Revision:	https://reviews.freebsd.org/D36195
MFC after:	1 week
Sponsored by:	NVIDIA Networking
This commit is contained in:
Goran Mekic 2022-09-27 19:28:27 +02:00 committed by Hans Petter Selasky
parent 08af8aac2a
commit f092c21bf6
3 changed files with 141 additions and 0 deletions
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2
share/examples/Makefile
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@ -320,6 +320,8 @@ SE_DIRS+= sound
SE_SOUND= \
basic.c \
ossinit.h \
ossmidi.h \
midi.c \
README
SE_DIRS+= sunrpc

76
share/examples/sound/midi.c Normal file
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@ -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;
}

63
share/examples/sound/ossmidi.h Normal file
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@ -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);
}
}