Expose now-playing, album colours and tempo as switch attributes#2
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While an area is syncing, the switch now publishes extra state attributes so a dashboard card can reflect what's playing -- recolour to the extracted album palette and lock a visualizer to the song: - album_colors: the engine's extracted album palette as #rrggbb (when Colour = Album colours) - bpm: detected tempo once the rhythm model locks - media_title / media_artist / entity_picture: now-playing from the followed player - source_player: the media_player being followed The session computes this snapshot in its render loop and only fires a state write when the values actually change (per track / on tempo lock), so it stays quiet for the state machine and recorder. The attributes disappear when the area stops syncing. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
engabd11
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Jun 10, 2026
PR #2 exposes album colours, tempo and now-playing on the switch, but not the playback position. The companion Hue Music Sync Card's visualizer locks a beat grid to the song from media_position + media_position_updated_at, and reads them off the switch when no media_player is configured in the card. Mirror those two anchors from the followed player into the published state. They re-anchor only on seek / play-pause / track-change, so the recorder isn't spammed and the card extrapolates the live position between updates. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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What
While an area is syncing, the area's
switchnow publishes extra stateattributes describing what's playing, so a dashboard card can recolour itself to
the album and lock a visualizer to the song:
album_colors#rrggbb(when Colour = Album colours).bpmmedia_title/media_artist/entity_picturesource_playermedia_playerthe sync is following.Why
The companion Hue Music Sync Card
colours itself from what's playing. It can extract album colours client-side from
the art, but the integration already extracts a vivid palette (k-means) and
tracks tempo — exposing those lets the card use the exact colours driving the
lights and run its bars at the real BPM, instead of approximating.
How
SyncSessioncomputes apublic_statesnapshot (coordinator.py) in itsrender loop and stores the latest
BeatGridand extracted album palette._maybe_publish()runs ~1 Hz and only fires a state write when the valueschange (per track / on tempo lock), so it stays quiet for the state machine
and recorder. Album colours also publish immediately when extraction completes.
SyncManager.area_attributes()returns the active session's snapshot (emptywhen idle);
HueMusicSyncSwitch.extra_state_attributessurfaces it, so theattributes appear only while syncing and disappear on stop.
No changes to the audio/effects/DTLS core. README updated with the attribute
table.
Notes / review points
None).bpmis rounded to an integer and gated onBeatGrid.locked, so it doesn'tchurn while the tempo estimate settles.
excluderecommendation or move them behind ahomeassistant.helpers.entityrecorder filter — they're already change-gated so the volume is low.
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