Interface SidecarTextTrackControllerDeps

Declarative selection / rendering configuration. Re-applied on change.

Supplies the current playhead used to fetch caption segments in a window around it.

Optional request init options forwarded with each VTT fetch (e.g. CORS).

Hands out (memoized) DOM text tracks. Text tracks can only be created on a media element and never removed, so the provider reuses one track per rendition rather than accumulating them.

Optional renderer that paints cues itself (HTML overlay). When provided, the DOM text track is kept 'hidden' (timing only) and the renderer is handed the active track; without one, the track renders natively ('showing').

The discovered text tracks, re-emitted whenever the manifest changes.