git: 15ae481e056b - stable/13 - snd_uaudio(4): Add some examples accessing USB MIDI devices.
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Date: Tue, 04 Oct 2022 14:50:19 UTC
The branch stable/13 has been updated by hselasky: URL: https://cgit.FreeBSD.org/src/commit/?id=15ae481e056be4a67fa9aa5af7cbd04de2eece2b commit 15ae481e056be4a67fa9aa5af7cbd04de2eece2b Author: Goran Mekic <meka@tilda.center> AuthorDate: 2022-09-27 17:28:27 +0000 Commit: Hans Petter Selasky <hselasky@FreeBSD.org> CommitDate: 2022-10-04 14:40:50 +0000 snd_uaudio(4): Add some examples accessing USB MIDI devices. Differential Revision: https://reviews.freebsd.org/D36195 Sponsored by: NVIDIA Networking (cherry picked from commit f092c21bf630543dc899a444fa7885d0bbbaedfd) --- 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); + } +}