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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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14
spa/plugins/control/mixer.c
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@ -826,11 +826,15 @@ static int impl_node_process(void *object)
case SPA_CONTROL_UMP:
{
uint8_t ev[8];
int ev_size = spa_ump_to_midi((uint32_t*)body, size, ev, sizeof(ev));
if (ev_size <= 0)
break;
spa_pod_builder_control(&builder, control->offset, SPA_CONTROL_Midi);
spa_pod_builder_bytes(&builder, ev, ev_size);
const uint32_t *ump = (const uint32_t*)body;
uint64_t state = 0;
while (size > 0) {
int ev_size = spa_ump_to_midi(&ump, &size, ev, sizeof(ev), &state);
if (ev_size <= 0)
break;
spa_pod_builder_control(&builder, control->offset, SPA_CONTROL_Midi);
spa_pod_builder_bytes(&builder, ev, ev_size);
}
break;
}
}