Add Audio Output Switcher to Plugin Store

[zomars]

Add Audio Output Switcher to Plugin Store

Audio Output Switcher lets you change the default audio output device directly from the Quick Access Menu, without a trip to desktop mode. This is especially useful on devices where gamemode has no output picker at all — e.g. on a Steam Machine driving a TV, the QAM audio section is only a CEC volume slider.

What it does:

• Lists every available audio output (sink), with the active device marked and pinned to the top.
• Switches the default sink with one tap, and also moves already-playing streams to the new device (set-default-sink alone only affects streams that start afterward), so audio follows immediately.
• Repolls while the panel is open, so wireless headsets connecting/disconnecting show up without reloading.

The backend is the standard Python backend and shells out to pactl (already part of SteamOS) — no bundled binaries, and the plugin declares no flags, so it runs as the ordinary user rather than root. Commands go through asyncio.create_subprocess_exec with a timeout, and the PipeWire runtime dir is derived from decky.DECKY_USER's uid so pactl reaches the right user session.

Task Checklist

Developer

• I am the original author or an authorized maintainer of this plugin.
• I have abided by the licenses of the libraries I am utilizing, including attaching license notices where appropriate.
• Generative AI was NOT used to write a majority of the code I am submitting.

Plugin

• I have verified that my plugin works properly on the Stable and Beta update channels of SteamOS.
• I have verified my plugin is unique or provides more/alternative functionality to a plugin already on the store.

Backend

• No: I am using a custom backend other than Python.
• No: I am using a tool or software from a 3rd party FOSS project that does not have it's dependencies statically linked.
• No: I am using a custom binary that has all of it's dependencies statically linked.

Community

• I have tested and left feedback on two other pull requests for new or updating plugins.
• I have commented links to my testing report in this PR.

Testing

• Tested by a third party on SteamOS Stable or Beta update channel.

[github-actions]

Issues Found

• Neither testing box is present in your description. Please include one of them per the Markdown comment above the testing section.

Next Steps

1. If we found any issues above, please edit your pull request description to resolve them and leave a comment saying you've done so.
2. For the quickest review, please see the Community section of the pull request template for how you can help other developers.
3. Once your description is correct, a maintainer will review your pull request as soon as possible.

Thank you for your contribution! If you need any help, please reach out on our Discord server. ❤️

[github-actions]

This pull request is stale as no updates or testing reports have been posted within the last 7 days. Please ensure you are actively recruiting testers or resolving the issues discussed. If you do not remove the stale label or comment, this will be closed in 7 days. Please close this pull request if you need more time to resolve issues so we can keep our repo healthy.

[zomars]

Testing reports I left on other plugin pull requests, per the Community checklist:

• #1106 — Update Bluetooth to v3.0.0 — built from the submodule commit and verified it reproduces the release artifact, then tested the D-Bus rewrite against a controller and a set of earbuds.
• #1104 — Add Decky SSH to Plugin Store — verified the root flag, the systemd toggle and the PAM-based current-password check.

Both were tested on SteamOS Stable with Decky Loader 3.2.6.