Christian PillsburyandClaude Opus 4.8 8a9e2911fd wip(spf): relocate text cues via a composed step pipeline (#6) ...

Reinstate text-cue relocation (dropped with relocation.ts) and, in the
same pass, rearchitect the text-segment loader onto the v/a loader's
composed-step model so relocation is a pipeline step, not a resolver
wrapper.

Text loader gains TextFrame / TextLoadStep / TextStepDeps /
TextMessagePipelines mirroring segment-loader, with base resolveCuesStep
+ dispatchCuesStep (default: resolveCues -> dispatchCues). makeLoadTask
now just runs the pipeline. The resolver reverts to a pure (url) => cues
host primitive (the text analog of fetchBytes) -- composition-awareness
moves entirely into the injected step, so composition state threads via
compositionDeps into TextStepDeps.

Relocation supplies relocatingTextPipelines (resolveWithMetadata ->
relocateCues -> dispatchCues): cues + X-TIMESTAMP-MAP fetched in
parallel, cues shifted by (mapCorrection - startMediaTime) using the
primary A/V track's startMediaTime (video ?? audio, awaited). The engine
bakes textMessagePipelines, mirroring video/audioMessagePipelines.

Base steps are generic arrow consts (TextStepDeps is contravariant in C
via textTracksActor.send). Sandbox-verified 0-based against the Mux
asset_start_time=60 clip: active cue brackets the 0-based playhead.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

2026-07-10 10:29:35 -07:00

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spf

wip(spf): relocate text cues via a composed step pipeline (#6)

2026-07-10 10:29:35 -07:00

store

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