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control: improve UMP to Midi conversiom

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Improve the spa_ump_to_midi function so that it can consume multiple UMP
messages and produce multiple midi messages.

Some UMP messages (like program changes) need to be translated into up
to 3 midi messages. Do this byt adding a state to the function and by
making it consume the input bytes, just like the spa_ump_from_midi
function.

Adapt code to this new world. This is a little API break..
This commit is contained in:
Wim Taymans 2025-08-19 17:41:03 +02:00
parent bf10458604
commit e35a8554f8
13 changed files with 307 additions and 228 deletions
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53
spa/plugins/alsa/alsa-seq.c
View file

@ -880,34 +880,41 @@ static int process_write(struct seq_state *state)
snd_seq_event_t ev;
uint8_t data[MAX_EVENT_SIZE];
int size;
uint64_t st = 0;
if ((size = spa_ump_to_midi((uint32_t *)body, body_size, data, sizeof(data))) <= 0)
continue;
while (body_size > 0) {
if ((size = spa_ump_to_midi((const uint32_t **)&body, &body_size,
data, sizeof(data), &st)) <= 0)
break;
if (first)
snd_seq_ev_clear(&ev);
if (first)
snd_seq_ev_clear(&ev);
if ((size = snd_midi_event_encode(stream->codec, data, size, &ev)) < 0) {
spa_log_warn(state->log, "failed to encode event: %s", snd_strerror(size));
snd_midi_event_reset_encode(stream->codec);
if ((size = snd_midi_event_encode(stream->codec, data, size, &ev)) < 0) {
spa_log_warn(state->log, "failed to encode event: %s",
snd_strerror(size));
snd_midi_event_reset_encode(stream->codec);
first = true;
continue;
}
first = false;
if (ev.type == SND_SEQ_EVENT_NONE)
/* this can happen when the event is not complete yet, like
* a sysex message and we need to encode some more data. */
continue;
snd_seq_ev_set_source(&ev, state->event.addr.port);
snd_seq_ev_set_dest(&ev, port->addr.client, port->addr.port);
snd_seq_ev_schedule_real(&ev, state->event.queue_id, 0, &out_rt);
debug_event(state, "send", &ev);
if ((err = snd_seq_event_output(state->event.hndl, &ev)) < 0) {
spa_log_warn(state->log, "failed to output event: %s",
snd_strerror(err));
}
first = true;
continue;
}
first = false;
if (ev.type == SND_SEQ_EVENT_NONE)
/* this can happen when the event is not complete yet, like
* a sysex message and we need to encode some more data. */
continue;
snd_seq_ev_set_source(&ev, state->event.addr.port);
snd_seq_ev_set_dest(&ev, port->addr.client, port->addr.port);
snd_seq_ev_schedule_real(&ev, state->event.queue_id, 0, &out_rt);
if ((err = snd_seq_event_output(state->event.hndl, &ev)) < 0) {
spa_log_warn(state->log, "failed to output event: %s",
snd_strerror(err));
}
first = true;
}
}
}