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wernermisc/midi2osc/midi2osc.c

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/*
* midi2osc.c - MIDI to OSC forwarder
*
* Written 2011 by Werner Almesberger
* Copyright 2011 Werner Almesberger
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <alsa/asoundlib.h>
#include "lo/lo.h"
#define NAME "midi2osc"
static int debug = 0;
static struct map {
int chan_in, ctrl_in;
int chan_out, ctrl_out;
int value;
struct map *next;
} *mappings = NULL;
static void add(int chan_in, int ctrl_in, int chan_out, int ctrl_out,
int value)
{
struct map *new;
new = malloc(sizeof(struct map));
new->chan_in = chan_in;
new->ctrl_in = ctrl_in;
new->chan_out = chan_out;
new->ctrl_out = ctrl_out;
new->value = value;
new->next = mappings;
mappings = new;
}
static void add_mapping(const char *s)
{
unsigned chan_in, ctrl_in, chan_out, ctrl_out, value;
if (sscanf(s, "c%u.%u=c%u.%u=%u",
&chan_in, &ctrl_in, &chan_out, &ctrl_out, &value) == 5)
add(chan_in, ctrl_in, chan_out, ctrl_out, value);
else if (sscanf(s, "c%u.%u=c%u.%u",
&chan_in, &ctrl_in, &chan_out, &ctrl_out) == 4)
add(chan_in, ctrl_in, chan_out, ctrl_out, -1);
else if (sscanf(s, "c%u.%u=c%u", &chan_in, &ctrl_in, &chan_out) == 3)
add(chan_in, ctrl_in, chan_out, -1, -1);
else if (sscanf(s, "c%u=c%u.%u", &chan_in, &chan_out, &ctrl_out) == 3)
add(chan_in, -1, chan_out, ctrl_out, -1);
else if (sscanf(s, "c.%u=c%u.%u", &ctrl_in, &chan_out, &ctrl_out) == 3)
add(-1, ctrl_in, chan_out, ctrl_out, -1);
else if (sscanf(s, "c%u=c%u", &chan_in, &chan_out) == 2)
add(chan_in, -1, chan_out, -1, -1);
else {
fprintf(stderr, "unrecognized mapping syntax\n");
exit(1);
}
}
static void map(uint8_t *chan, uint8_t *ctrl, uint8_t *value)
{
const struct map *m;
for (m = mappings; m; m = m->next)
if ((m->chan_in == -1 || m->chan_in == *chan) &&
(m->ctrl_in == -1 || m->ctrl_in == *ctrl)) {
if (m->chan_out != -1)
*chan = m->chan_out;
if (m->ctrl_out != -1)
*ctrl = m->ctrl_out;
if (m->value != -1)
*value = m->value;
return;
}
}
static void forward(snd_seq_t *midi, lo_address osc)
{
snd_seq_event_t *ev;
uint8_t msg[4] = { 0, };
uint8_t chan, ctrl, value;
while (snd_seq_event_input(midi, &ev)) {
switch (ev->type) {
case SND_SEQ_EVENT_NOTEON:
if (debug)
fprintf(stderr, "note c%u.%u=%u\n",
ev->data.note.channel,
ev->data.note.note,
ev->data.note.velocity);
msg[1] = 0x90 | ev->data.note.channel;
msg[2] = ev->data.note.note;
msg[3] = ev->data.note.velocity;
break;
case SND_SEQ_EVENT_CONTROLLER:
chan = ev->data.control.channel;
ctrl = ev->data.control.param;
value = ev->data.control.value;
map(&chan, &ctrl, &value);
if (debug)
fprintf(stderr,
"control c%u.%u=%u -> c%u.%u=%u\n",
ev->data.control.channel,
ev->data.control.param,
ev->data.control.value,
chan, ctrl, value);
msg[1] = 0xb0 | chan;
msg[2] = ctrl;
msg[3] = value;
break;
case SND_SEQ_EVENT_PGMCHANGE:
if (debug)
fprintf(stderr, "prog c%u=%u\n",
ev->data.control.channel,
ev->data.control.value);
msg[1] = 0xe0 | ev->data.control.channel;
msg[2] = ev->data.control.value;
msg[3] = 0;
break;
case SND_SEQ_EVENT_PITCHBEND:
if (debug)
fprintf(stderr, "pitch c%u=%u\n",
ev->data.control.channel,
ev->data.control.value);
msg[1] = 0xe0 | ev->data.control.channel;
msg[2] = ev->data.control.value & 0x7f;
msg[3] = ev->data.control.value >> 7;
break;
default:
/* Flickernoise currently doesn't support any others */
if (debug)
fprintf(stderr, "unrecognized MIDI event %u\n",
ev->type);
snd_seq_free_event(ev);
continue;
}
if (lo_send(osc, "/midi", "m", msg) < 0)
fprintf(stderr, "%s\n", lo_address_errstr(osc));
snd_seq_free_event(ev);
}
}
static void usage(const char *name)
{
fprintf(stderr,
"usage: %s [-d] [mapping ...] hostname [port]\n\n"
" mappings are of the form\n"
" c[<chan>][.<control>]=c<chan>[.<control>[=<value>]]\n\n"
" -d debug mode: print all MIDI messages\n",
name);
exit(1);
}
int main(int argc, char **argv)
{
const char *port = "4444"; /* Milkymist One OSC port */
lo_address osc;
snd_seq_t *midi;
int c, arg;
while ((c = getopt(argc, argv, "d")) != EOF)
switch (c) {
case 'd':
debug = 1;
break;
default:
usage(*argv);
}
for (arg = optind; arg != argc; arg++) {
if (!strchr(argv[arg], '='))
break;
add_mapping(argv[arg]);
}
switch (argc-arg) {
case 1:
break;
case 2:
port = argv[arg+1];
break;
default:
usage(*argv);
}
osc = lo_address_new(argv[arg], port);
if (!osc) {
fprintf(stderr, "invalid address %s %s\n", argv[arg], port);
exit(1);
}
if (snd_seq_open(&midi, "hw", SND_SEQ_OPEN_INPUT,0) < 0) {
fprintf(stderr, "can't open ALSA sequencer\n");
exit(1);
}
snd_seq_set_client_name(midi, NAME);
if (snd_seq_create_simple_port(midi, NAME,
SND_SEQ_PORT_CAP_WRITE | SND_SEQ_PORT_CAP_SUBS_WRITE,
SND_SEQ_PORT_TYPE_APPLICATION) < 0) {
fprintf(stderr, "can't create sequencer port\n");
exit(1);
}
forward(midi, osc);
return 0;
}