diff --git a/share/examples/Makefile b/share/examples/Makefile --- a/share/examples/Makefile +++ b/share/examples/Makefile @@ -320,6 +320,8 @@ 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 --- /dev/null +++ b/share/examples/sound/midi.c @@ -0,0 +1,74 @@ +/* + * 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 + +#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) { + event.type = raw & NOTE_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; + } + } + + return 0; +} diff --git a/share/examples/sound/ossmidi.h b/share/examples/sound/ossmidi.h new file mode 100644 --- /dev/null +++ b/share/examples/sound/ossmidi.h @@ -0,0 +1,67 @@ +/* + * 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 +#include +#include + + +unsigned const NOTE_MASK = 0xF0; +unsigned const NOTE_ON = 0x90; +unsigned const NOTE_OFF = 0x80; +unsigned const CHANNEL_MASK = 0xF; +unsigned const 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); + } +}