PipeWire Hackfest Reports
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Update from the PipeWire hackfest
As the third and final day of the PipeWire hackfest draws to a close, I thought I’d summarise some of my thoughts on the goings-on and the future.
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One key thing that PulseAudio does right (I know there are people who disagree!) is having a custom configuration that automagically works on a lot of Intel HDA-based systems. We’ve been wondering how to deal with this in PipeWire, and the path we think makes sense is to transition to ALSA UCM configuration. This is note as flexible as we need it to be, but I’d like to extend it for that purpose if possible. This would ideally also help consolidate the various methods of configuration being used by the various Linux userspaces.
To that end, I’ve started trying to get a UCM setup on my desktop that PulseAudio can use, and be functionally equivalent to what we do with our existing configuration. There are missing bits and bobs, and I’m currently focusing on the ones related to hardware volume control. I’ll write about this in the future as the effort expands out to other hardware.
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Pipewire Hackfest 2018
For Pipewire, the policy decisions would be split off from the main daemon. Pipewire, as it gains PulseAudio compatibility layers, will grow a default/example policy engine that will try to replicate PulseAudio's behaviour. At the very least, that will mean that Pipewire won't regress compared to PulseAudio, and might even be able to take better decisions in the short term.
For GNOME, we still wanted to take control of that part of the experience, and make our own policy decisions. It's very possible that this engine will end up being featureful and generic enough that it will be used by more than just GNOME, or even become the default Pipewire one, but it's far too early to make that particular decision.
In the meanwhile, we wanted the GNOME policies to not be written in C, difficult to experiment with for power users, and for edge use cases. We could have started writing a configuration language, but it would have been too specific, and there are plenty of embeddable languages around. It was also a good opportunity for me to finally write the helper library I've been meaning to write for years, based on my favourite embedded language, Lua.
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