[flavves]

Summary

This PR adds a Linux-only (#[cfg(target_os = "linux")]) Adaptive Equalizer feature that monitors active media players via D-Bus MPRIS (org.mpris.MediaPlayer2.*), detects the genre of the currently playing track (with special handling for browser / YouTube Music metadata), and automatically switches the device's built-in PresetEqualizerProfile.

Related to the genre-based equalizer switching use case mentioned in #348.

What's Included

1. openscq30-lib (adaptive_eq module, Linux only):

   • Reads active org.mpris.MediaPlayer2.* session bus players and parses PlaybackStatus and Metadata (xesam:title, xesam:artist, xesam:album, xesam:genre, xesam:url).
   • Cleans YouTube / YouTube Music metadata (strips - Topic, VEVO, (Official Video), (feat. ...), and extracts Artist - Title when the uploader channel is a record label).
   • Resolves the target Soundcore preset profile in priority order:
     1. User-defined custom rules (by Artist, Title/Keyword, or Genre)
     2. Priority title keywords (e.g. acoustic, unplugged, piano, podcast, audiobook, phonk, lo-fi)
     3. MPRIS xesam:genre metadata
     4. Optional online genre lookup (iTunes Search API, Deezer API, MusicBrainz API) with in-memory per-track caching (only queried on track change, can be disabled in GUI or via --no-online in CLI)
     5. Record label / channel hints and local keyword matching
     6. Configurable fallback preset profile
   • Persists configuration in adaptive_eq.json inside the application config directory.

2. openscq30-gui (Adaptive EQ nav tab, Linux only):

   • Adds an Adaptive EQ (YT Music) page to the device settings sidebar.
   • Displays live player status, current track, detected genre/source,applied preset, custom rules editor, customizable genre-to-preset mappings, and recent switch history.
   • Includes English (en) and Turkish (tr) Fluent translations.

3. openscq30-cli (adaptive-eq subcommand, Linux only):

   • Adds openscq30 adaptive-eq (and openscq30 device -a <MAC> adaptive-eq) with --once, --dry-run, --all-players, --no-online, --default-profile, --interval, and --json flags.

Platform Compatibility

All changes are gated behind #[cfg(target_os = "linux")] and use standard library process calls without modifying Cargo.toml or Cargo.lock, so Windows and Android builds remain unaffected.

Images