upstream/opnsense-src
1
0
Fork 0
mirror of https://github.com/opnsense/src.git synced 2026-06-11 01:30:30 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

sound examples: Simplify MIDI example

Browse source 
Sponsored by:	The FreeBSD Foundation
MFC after:	2 days
Reviewed by:	dev_submerge.ch, emaste
Differential Revision:	https://reviews.freebsd.org/D46306
This commit is contained in:
Christos Margiolis 2024-08-24 15:07:40 +03:00
parent 9aac27599a
commit 0ca4d5d820
3 changed files with 46 additions and 97 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
share/examples/Makefile
View file

@ -322,8 +322,7 @@ SE_SOUND_OSS= \
README \
basic.c \
midi.c \
ossinit.h \
ossmidi.h
ossinit.h
SE_DIRS+= sunrpc
SE_SUNRPC= Makefile

77
share/examples/sound/oss/midi.c
View file

@ -2,6 +2,10 @@
* 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
@ -25,52 +29,61 @@
* SUCH DAMAGE.
*/
#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "ossmidi.h"
#define CMD_MASK 0xF0
#define CHANNEL_MASK 0x0F
#define NOTE_ON 0x90
#define NOTE_OFF 0x80
#define CTL_CHANGE 0xB0
int
main()
main(int argc, char *argv[])
{
midi_event_t event;
midi_config_t midi_config;
int l = -1;
unsigned char raw;
int fd;
unsigned char raw, type, channel, b1, b2;
midi_config.device = "/dev/umidi1.0";
oss_midi_init(&midi_config);
if ((fd = open("/dev/umidi0.0", O_RDWR)) < 0)
err(1, "Error opening MIDI device");
while ((l = read(midi_config.fd, &raw, sizeof(raw))) != -1) {
if (!(raw & 0x80)) {
for (;;) {
if (read(fd, &raw, sizeof(raw)) < sizeof(raw))
err(1, "Error reading command byte");
if (!(raw & 0x80))
continue;
}
event.type = raw & CMD_MASK;
event.channel = raw & CHANNEL_MASK;
switch (event.type) {
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:
case NOTE_OFF:
case CONTROLLER_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);
}
printf("Channel %d, note on %d, velocity %d\n",
channel, b1, b2);
break;
}
switch (event.type) {
case NOTE_ON:
case NOTE_OFF:
printf("Channel %d, note %d, velocity %d\n", event.channel, event.note, event.velocity);
printf("Channel %d, note off %d, velocity %d\n",
channel, b1, b2);
break;
case CONTROLLER_ON:
printf("Channel %d, controller %d, value %d\n", event.channel, event.controller, event.value);
case CTL_CHANGE:
printf("Channel %d, controller change %d, value %d\n",
channel, b1, b2);
break;
default:
printf("Unknown event type %d\n", event.type);
printf("Unknown event type %d\n", type);
break;
}
}
return 0;
close(fd);
return (0);
}

63
share/examples/sound/oss/ossmidi.h
View file

@ -1,63 +0,0 @@
/*
* SPDX-License-Identifier: BSD-2-Clause
*
* 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 CONTROLLER_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);
}
}