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alsa-seq: handle large control events

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Handle the case where the control event is large and needs to be
encoded into multiple midi events.
This commit is contained in:
Wim Taymans 2024-05-09 18:49:00 +02:00
parent 7dcfe81690
commit cb8330c798
1 changed files with 41 additions and 34 deletions
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21
spa/plugins/alsa/alsa-seq.c
View file

@ -644,29 +644,35 @@ static int process_write(struct seq_state *state)
}
SPA_POD_SEQUENCE_FOREACH(pod, c) {
long s;
long s, body_size;
uint8_t *body;
if (c->type != SPA_CONTROL_Midi)
continue;
body = SPA_POD_BODY(&c->value);
body_size = SPA_POD_BODY_SIZE(&c->value);
while (body_size > 0) {
if (size == 0)
/* only reset when we start decoding a new message */
snd_seq_ev_clear(&ev);
if ((s = snd_midi_event_encode(stream->codec,
SPA_POD_BODY(&c->value),
SPA_POD_BODY_SIZE(&c->value), &ev)) < 0) {
body, body_size, &ev)) < 0) {
spa_log_warn(state->log, "failed to encode event: %s",
snd_strerror(s));
snd_midi_event_reset_encode(stream->codec);
size = 0;
continue;
break;
}
body += s;
body_size -= s;
size += s;
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 get some more data. */
continue;
* a sysex message and we need to encode some more data. */
break;
snd_seq_ev_set_source(&ev, state->event.addr.port);
snd_seq_ev_set_dest(&ev, port->addr.client, port->addr.port);
@ -677,7 +683,7 @@ static int process_write(struct seq_state *state)
out_rt.tv_sec = out_time / SPA_NSEC_PER_SEC;
snd_seq_ev_schedule_real(&ev, state->event.queue_id, 0, &out_rt);
spa_log_trace_fp(state->log, "event %d time:%"PRIu64" offset:%d size:%ld port:%d.%d",
spa_log_info(state->log, "event %d time:%"PRIu64" offset:%d size:%ld port:%d.%d",
ev.type, out_time, c->offset, size, port->addr.client, port->addr.port);
if ((err = snd_seq_event_output(state->event.hndl, &ev)) < 0) {
@ -687,6 +693,7 @@ static int process_write(struct seq_state *state)
size = 0;
}
}
}
snd_seq_drain_output(state->event.hndl);
return res;