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103 lines
2.2 KiB
C
103 lines
2.2 KiB
C
/*
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* midi2osc.c - MIDI to OSC forwarder
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*
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* Written 2011 by Werner Almesberger
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* Copyright 2011 Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <alsa/asoundlib.h>
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#include "lo/lo.h"
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#define NAME "midi2osc"
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static void forward(snd_seq_t *midi, lo_address osc)
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{
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snd_seq_event_t *ev;
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uint8_t msg[4] = { 0, };
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while (snd_seq_event_input(midi, &ev)) {
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switch (ev->type) {
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case SND_SEQ_EVENT_NOTEON:
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msg[1] = 0x90 | ev->data.control.channel;
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msg[2] = ev->data.note.note;
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msg[3] = ev->data.note.velocity;
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break;
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case SND_SEQ_EVENT_CONTROLLER:
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msg[1] = 0xb0 | ev->data.control.channel;
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msg[2] = ev->data.control.param;
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msg[3] = ev->data.control.value;
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break;
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case SND_SEQ_EVENT_PITCHBEND:
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msg[1] = 0xe0 | ev->data.control.channel;
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msg[2] = ev->data.control.value;
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msg[3] = 0;
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break;
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default:
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/* Flickernoise currently doesn't support any others */
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snd_seq_free_event(ev);
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continue;
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}
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if (lo_send(osc, "/midi", "m", msg) < 0)
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fprintf(stderr, "%s\n", lo_address_errstr(osc));
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snd_seq_free_event(ev);
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}
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}
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static void usage(const char *name)
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{
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fprintf(stderr, "usage: %s hostname [port]\n", name);
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exit(1);
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}
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int main(int argc, char **argv)
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{
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const char *port = "4444"; /* Milkymist One OSC port */
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lo_address osc;
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snd_seq_t *midi;
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switch (argc) {
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case 2:
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break;
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case 3:
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port = argv[2];
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break;
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default:
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usage(*argv);
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}
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osc = lo_address_new(argv[1], port);
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if (!osc) {
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fprintf(stderr, "invalid address %s %s\n", argv[1], port);
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exit(1);
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}
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if (snd_seq_open(&midi, "hw", SND_SEQ_OPEN_INPUT,0) < 0) {
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fprintf(stderr, "can't open ALSA sequencer\n");
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exit(1);
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}
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snd_seq_set_client_name(midi, NAME);
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if (snd_seq_create_simple_port(midi, NAME,
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SND_SEQ_PORT_CAP_WRITE | SND_SEQ_PORT_CAP_SUBS_WRITE,
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SND_SEQ_PORT_TYPE_APPLICATION) < 0) {
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fprintf(stderr, "can't create sequencer port\n");
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exit(1);
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}
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forward(midi, osc);
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return 0;
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}
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