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alsa: link driver and follower

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When we are using the same clock (!matching) try to link the two PCM
devices together. This starts and stops the devices at the same time and
gives better latency.
This commit is contained in:
Wim Taymans 2023-09-11 11:04:49 +02:00
parent 4568d90565
commit 20db9e2d70
3 changed files with 83 additions and 12 deletions
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4
spa/plugins/alsa/acp/acp.c
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@ -388,6 +388,8 @@ static int add_pro_profile(pa_card *impl, uint32_t index)
pa_alsa_init_proplist_pcm(NULL, m->output_proplist, m->output_pcm);
pa_proplist_setf(m->output_proplist, "clock.name", "api.alsa.%u", index);
pa_proplist_setf(m->output_proplist, "device.profile.pro", "true");
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_alsa_close(&m->output_pcm);
m->supported = true;
pa_channel_map_init_auto(&m->channel_map, m->sample_spec.channels, PA_CHANNEL_MAP_AUX);
@ -419,6 +421,8 @@ static int add_pro_profile(pa_card *impl, uint32_t index)
pa_alsa_init_proplist_pcm(NULL, m->input_proplist, m->input_pcm);
pa_proplist_setf(m->input_proplist, "clock.name", "api.alsa.%u", index);
pa_proplist_setf(m->input_proplist, "device.profile.pro", "true");
pa_proplist_setf(m->input_proplist, "node.group", "pro-audio-%u", index);
pa_proplist_setf(m->input_proplist, "node.link-group", "pro-audio-%u", index);
pa_alsa_close(&m->input_pcm);
m->supported = true;
pa_channel_map_init_auto(&m->channel_map, m->sample_spec.channels, PA_CHANNEL_MAP_AUX);