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midi2osc: added channel and control number mapping

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This commit is contained in:
Werner Almesberger 2011-11-24 02:51:10 -03:00
parent 571af6d11f
commit 2d50444b1b
2 changed files with 92 additions and 11 deletions
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13
midi2osc/README
View File

@ -19,3 +19,16 @@ To use it with the Milkymist One,
- in the "Connections" window, drag a connection from each MIDI device
you want to connect to midi2osc
- MIDI events will now show up in the MIDI settings dialog, etc.
midi2osc can also remap MIDI controls. The syntax is
c<chan>[.<control>]=c<chan>[.<control>]
where <chan> is a channel number and <control> is the optional control
number. For example,
./midi2osc c8.1=c0.1 c8.2=c0.2 c9.1=c0.3 c9.2=c0.4 c0.7=c0.5 c7.7=c0.6 m1
would map the joysticks and two faders of a Faderfox LV3 to the
controls 1 through 6 on channel 0, and send the OSC messages to
a host called "m1".

90
midi2osc/midi2osc.c
View File

@ -24,10 +24,68 @@
static int debug = 0;
static struct map {
int chan_in, ctrl_in;
int chan_out, ctrl_out;
struct map *next;
} *mappings = NULL;
static void add(int chan_in, int ctrl_in, int chan_out, int ctrl_out)
{
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->next = mappings;
mappings = new;
}
static void add_mapping(const char *s)
{
unsigned chan_in, ctrl_in, chan_out, ctrl_out;
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);
else if (sscanf(s, "c%u.%u=c%u", &chan_in, &ctrl_in, &chan_out) == 3)
add(chan_in, ctrl_in, chan_out, -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);
else if (sscanf(s, "c%u=c%u", &chan_in, &chan_out) == 2)
add(chan_in, -1, chan_out, -1);
else {
fprintf(stderr, "unrecognized mapping syntax\n");
exit(1);
}
}
static void map(uint8_t *chan, uint8_t *ctrl)
{
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;
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;
while (snd_seq_event_input(midi, &ev)) {
switch (ev->type) {
@ -37,12 +95,17 @@ static void forward(snd_seq_t *midi, lo_address osc)
msg[3] = ev->data.note.velocity;
break;
case SND_SEQ_EVENT_CONTROLLER:
msg[1] = 0xb0 | ev->data.control.channel;
msg[2] = ev->data.control.param;
chan = ev->data.control.channel;
ctrl = ev->data.control.param;
map(&chan, &ctrl);
msg[3] = ev->data.control.value;
if (debug)
fprintf(stderr, "CC(%u) %u %u\n",
ev->data.control.channel, msg[2], msg[3]);
fprintf(stderr, "c%u.%u(%u) -> c%u.%u\n",
ev->data.control.channel,
ev->data.control.param, msg[3],
chan, ctrl);
msg[1] = 0xb0 | chan;
msg[2] = ctrl;
break;
case SND_SEQ_EVENT_PITCHBEND:
msg[1] = 0xe0 | ev->data.control.channel;
@ -64,7 +127,8 @@ static void forward(snd_seq_t *midi, lo_address osc)
static void usage(const char *name)
{
fprintf(stderr,
"usage: %s hostname [-d] [port]\n\n"
"usage: %s hostname [-d] [mapping ...] [port]\n\n"
" mappings are of the form c<chan>[.<control>]=c<chan>[.<control>]\n\n"
" -d debug mode: print all MIDI messages\n",
name);
exit(1);
@ -76,8 +140,7 @@ int main(int argc, char **argv)
const char *port = "4444"; /* Milkymist One OSC port */
lo_address osc;
snd_seq_t *midi;
int c;
int c, arg;
while ((c = getopt(argc, argv, "d")) != EOF)
switch (c) {
@ -88,19 +151,24 @@ int main(int argc, char **argv)
usage(*argv);
}
switch (argc-optind) {
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[optind+1];
port = argv[arg+1];
break;
default:
usage(*argv);
}
osc = lo_address_new(argv[optind], port);
osc = lo_address_new(argv[arg], port);
if (!osc) {
fprintf(stderr, "invalid address %s %s\n", argv[optind], port);
fprintf(stderr, "invalid address %s %s\n", argv[arg], port);
exit(1);
}