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alsa: force IRQ scheduling for firewire in pro-audio profile

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FireWire ALSA driver latency is determined by the buffer size and not the
period. Timer-based scheduling is then not really useful on these devices as
the latency is fixed.

In pro-audio profile, enable IRQ scheduling unconditionally for these
devices, so that controlling the latency works properly.

See #4785
This commit is contained in:
Pauli Virtanen 2025-09-06 18:15:29 +03:00 • committed by Wim Taymans
parent 64aaf8a832
commit 916896c1cc
1 changed files with 8 additions and 1 deletions
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9
spa/plugins/alsa/acp/acp.c
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@ -465,7 +465,14 @@ static int add_pro_profile(pa_card *impl, uint32_t index)
} }
snd_ctl_close(ctl_hndl); snd_ctl_close(ctl_hndl);
if (n_capture == 1 && n_playback == 1) { /* FireWire ALSA driver latency is determined by the buffer size and not the
* period. Timer-based scheduling is then not really useful on these devices as
* the latency is fixed. Enable IRQ scheduling unconditionally for these devices,
* so that controlling the latency works properly.
*/
bool is_firewire = spa_streq(pa_proplist_gets(impl->proplist, "device.bus"), "firewire");
if ((n_capture == 1 && n_playback == 1) || is_firewire) {
PA_IDXSET_FOREACH(m, ap->output_mappings, idx) { PA_IDXSET_FOREACH(m, ap->output_mappings, idx) {
pa_proplist_setf(m->output_proplist, "node.group", "pro-audio-%u", index); pa_proplist_setf(m->output_proplist, "node.group", "pro-audio-%u", index);
pa_proplist_setf(m->output_proplist, "node.link-group", "pro-audio-%u", index); pa_proplist_setf(m->output_proplist, "node.link-group", "pro-audio-%u", index);