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monitors/alsa: provide splitting of UCM SplitPCM nodes

P V requested to merge pvir/wireplumber:alsa-ucm-split into master

Instruct ACP to provide information about UCM SplitPCM channel splitting instead of doing it with alsa-lib plugins.

Use the provided information to load loopbacks that create virtual sinks that do the channel remapping from UCM.

See pipewire!2216

  • clean it up (node names, etc.)

Would be great to have something that makes less of a mess in qpwgraph/helvum than module-loopback does, and that wouldn't need the extra hassle with the ObjectConfig routing.

Edited by P V

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