Desktop: Volume mixer widget, eww config refactor [WIP]

[kajusnau]

WIP Volume Mixer Widget - Major Changes Expected After GhafAudioControl Package Update

Description of Changes

1. Added Volume Mixer Widget in the Taskbar Quick Settings:

   • The volume mixer is accessible by clicking the "settings" icon next to the System Volume slider.
   • It dynamically displays currently active sink inputs (audio streams) or remains empty if no sink inputs are active.
   • Each sink input can be individually controlled, offering the same core functionality as the System Volume slider, including volume adjustment, mute, and unmute.
   • Each sink input will show the associated app icon if available. If not available, it will fallback to the default speaker icon.
   • Tested only with Google Chrome browser audio playback.

2. Adjusted Desktop Widgets Styling

3. Refactored Eww Config For Easier Maintenance

Known Issues:

1. Multiple Sliders Per App/VM:
   • Currently, for example, joining an MS Teams call via the app will cause several audio streams to appear.
     It would be more intuitive to have one slider per app, which would control all audio streams created by that app.
   • In the future, sink inputs will be replaced by VMs/Apps - meaning one slider per VM/App.

Checklist for things done

• Summary of the proposed changes in the PR description
• More detailed description in the commit message(s)
• Commits are squashed into relevant entities - avoid a lot of minimal dev time commits in the PR
• Contribution guidelines followed
• Ghaf documentation updated with the commit - https://tiiuae.github.io/ghaf/
• PR linked to architecture documentation and requirement(s) (ticket id)
• Test procedure described (or includes tests). Select one or more:
  • Tested on Lenovo X1 x86_64
  • Tested on Jetson Orin NX or AGX aarch64
  • Tested on Polarfire riscv64
• Author has run make-checks and it passes
• All automatic Github Action checks pass - see actions
• Author has added reviewers and removed PR draft status
• Change requires full re-installation
• Change can be updated with nixos-rebuild ... switch

Instructions for Testing

• List all targets that this applies to:
• Is this a new feature
  • List the test steps to verify:
• If it is an improvement how does it impact existing functionality?

[milva-unikie]

Tested this quickly on Lenovo-X1. Overall I think it looks great!

A few notes:

• If GhafAudioControl is "hidden" by default, there should be a way for the user to control speakers and microphones in the volume mixer.
• I agree that the amount of audio streams should be limited to one per vm before this volume mixer is taken into use. Now there is too many streams and no way for the user to know what controls what.
• Scrolling the streams is quite awkward. Limiting the amount of streams might fix this.
• All audio streams (Chrome browser, Slack, Teams, Zoom) are shown under the name of Google Chrome. As mentioned in Known issues this will be changed to be the name of the vm.

[kajusnau]

20.12 Update:
Changed to use GhafAudioControl dbus service to fetch info about audio streams.
Known bugs:

• Audio streams are not removed when closed (GhafAudioControl bug)