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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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35
doc/dox/config/pipewire-props.7.md
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@ -713,6 +713,11 @@ Normally, the maximum amount of channels will be used but with this setting
this can be reduced, which can make it possible to use other samplerates on
some devices.
@PAR@ device-prop api.alsa.split-enable # boolean
\parblock
\copydoc SPA_KEY_API_ALSA_SPLIT_ENABLE
\endparblock
## Node properties
@PAR@ node-prop audio.channels # integer
@ -796,6 +801,36 @@ UNDOCUMENTED
Enable only specific IEC958 codecs. This can be used to disable some codecs the hardware supports.
Available values: PCM, AC3, DTS, MPEG, MPEG2-AAC, EAC3, TRUEHD, DTSHD
@PAR@ device-prop api.alsa.split.parent # boolean
\parblock
\copydoc SPA_KEY_API_ALSA_SPLIT_PARENT
\endparblock
@PAR@ node-prop api.alsa.split.position # JSON
\parblock
\copybrief SPA_KEY_API_ALSA_SPLIT_POSITION
Informative property.
\endparblock
@PAR@ node-prop api.alsa.split.leader # boolean
\parblock
\copybrief SPA_KEY_API_ALSA_SPLIT_LEADER
Informative property.
\endparblock
@PAR@ node-prop api.alsa.split.hw-channels # int
\parblock
\copybrief SPA_KEY_API_ALSA_SPLIT_HW_CHANNELS
Informative property.
\endparblock
@PAR@ node-prop api.alsa.split.hw-position # JSON
\parblock
\copybrief SPA_KEY_API_ALSA_SPLIT_HW_POSITION
Informative property.
\endparblock
# BLUETOOTH PROPERTIES @IDX@ props
## Monitor properties