audio: add easyeffects profiles support

[Ape]

This commit adds support for switching between easyeffects profiles (output and input audio) if available.

Type of Change

• New feature

Testing

• Tested on Hyprland

Screenshots

Checklist

• Code follows project style guidelines
• Self-reviewed my code
• No new warnings or errors

[LucasOe]

While on the topic, personally I think it would be also nice if the Easy Effects Sink could be hidden from the selectable output devices.

[Ly-sec]

Nice feature, and the EasyEffects side discovery looks well thought out (XDG paths, Flatpak, easyeffectsrc, the runtime socket). I'd use this. Just wouldn't merge it as-is, mostly where the code lives and how often it runs.

What works

The Control Center rows make sense: show output/input presets when EasyEffects is actually there, hide them otherwise. IPC + OSD for effects-profile-set fits how we already expose audio stuff. Showing the active profile in the volume widget tooltip is a good bonus.

What I'd change

Pull it out of PipeWireService. EasyEffects isn't PipeWire, this is ~500 lines of socket I/O, INI parsing, and directory walks bolted onto a file that's already huge. A small dedicated service (whatever we want to call it) wired from Application, with AudioTab and IPC calling into it, would be much easier to live with.

Stop scanning the filesystem every frame. syncEffectsProfileControls() calls effectsProfiles() on every doUpdate, which stats the socket, walks config/data dirs, and may parse easyeffectsrc. No cache. That's a lot of I/O just because Control Center is open.

Ironically the active profile goes the other way - it's cached and only refreshed when the tab is created or you switch from Noctalia. So the list is hammered constantly but the selection can be wrong if you changed presets in EasyEffects itself.

Socket I/O on the UI thread is probably fine for a click (loadEffectsProfile has that ~250ms poll), but discovery shouldn't be on a hot path.

Smaller nits:

• "EasyEffects" is hardcoded in the volume tooltip, needs i18n
• the dismissTransientUi() flip is unrelated, would drop it from this PR

LucasOe's point about hiding the EasyEffects virtual sink from the device picker is fair, doesn't need to block this, but it's a natural follow-up.

Before merge

1. Extract out of pipewire_service.cpp
2. Cache profile discovery, refresh on tab open, after a successful load, maybe a lazy timer. Not every frame.
3. Actually refresh the active profile when it might've changed externally
4. i18n + IPC docs
5. Fix merge conflicts

Feature: yes. As written: needs another pass.

[Ape]

@ItsLemmy Can you reopen this so that I can change the base branch to main?

[ItsLemmy]

I had to recreate a v5 branch, so please do it quick if you can

[Ape]

I had to recreate a v5 branch, so please do it quick if you can

Base branch changed! However, I won't have time to finish this PR at least for a couple of days now.

[Ly-sec]

I had to recreate a v5 branch, so please do it quick if you can

Base branch changed! However, I won't have time to finish this PR at least for a couple of days now.

I'll mark is as a draft for now then :).

[Ape]

@Ly-sec, new version ready for review.