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spa: acp: get and emit UCM information for SplitPCM devices

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When api.alsa.split-enable=true for ACP device, instruct UCM to not
use alsa-lib plugins for SplitPCM devices.

Grab the information from UCM for the intended channel remapping, and
add the splitting information to the nodes emitted.

Session manager can then look at that, and load nodes to do the channel
splitting.
This commit is contained in:
Pauli Virtanen 2024-12-07 13:27:09 +02:00
parent 7c7a54dd87
commit dcccfcab7f
12 changed files with 422 additions and 22 deletions
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23
spa/include/spa/utils/keys.h
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@ -45,6 +45,14 @@ extern "C" {
#define SPA_KEY_API_ALSA_DISABLE_LONGNAME \
"api.alsa.disable-longname" /**< if card long name should not be passed to MIDI port */
#define SPA_KEY_API_ALSA_BIND_CTLS "api.alsa.bind-ctls" /**< alsa controls to bind as params */
#define SPA_KEY_API_ALSA_SPLIT_ENABLE "api.alsa.split-enable" /**< For UCM devices with split PCMs, don't split to
* multiple PCMs using alsa-lib plugins, but instead
* add api.alsa.split properties to emitted nodes
* with PCM splitting information.
*/
#define SPA_KEY_API_ALSA_SPLIT_PARENT "api.alsa.split.parent" /**< PCM is UCM SplitPCM parent PCM,
* to be opened with SplitPCM set.
*/
/** info from alsa card_info */
#define SPA_KEY_API_ALSA_CARD_ID "api.alsa.card.id" /**< id from card_info */
@ -67,6 +75,21 @@ extern "C" {
#define SPA_KEY_API_ALSA_PCM_SUBCLASS "api.alsa.pcm.subclass" /**< subclass from pcm_info as string */
#define SPA_KEY_API_ALSA_PCM_SYNC_ID "api.alsa.pcm.sync-id" /**< sync id */
#define SPA_KEY_API_ALSA_SPLIT_POSITION "api.alsa.split.position" /**< (SPA JSON list) If present, this is a
* virtual device corresponding to a subset of
* channels in an underlying PCM, listed in this
* property. The \ref SPA_KEY_API_ALSA_PATH
* contains the underlying split PCM. */
#define SPA_KEY_API_ALSA_SPLIT_LEADER "api.alsa.split.leader" /**< (bool) This virtual device is split leader:
* one of the split devices for the same split
* PCM is selected as the leader. */
#define SPA_KEY_API_ALSA_SPLIT_HW_CHANNELS \
"api.alsa.split.hw-channels" /**< (int) Number of channels in the underlying
* split PCM. */
#define SPA_KEY_API_ALSA_SPLIT_HW_POSITION \
"api.alsa.split.hw-position" /**< (SPA JSON list) Channel map of the
* underlying split PCM. */
/** keys for v4l2 api */
#define SPA_KEY_API_V4L2 "api.v4l2" /**< key for the v4l2 api */
#define SPA_KEY_API_V4L2_PATH "api.v4l2.path" /**< v4l2 device path as can be