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docs(spf): note duration sole-ownership in live-stream-support

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Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Christian Pillsbury
2026-06-25 10:00:21 -07:00
co-authored by Claude Opus 4.8
parent 3859da3dbd
commit 0d7208d2d4
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internal/design/spf/features/live-stream-support.md
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@@ -139,7 +139,7 @@ guard:
| Behavior | File | Live responsibility |
|---|---|---|
| `liveWindowFor` *(pure helper)* | `media/live-window.ts` | Derive the live window `{start,end,targetDuration}` from the selected video track, or `null` (VOD/ended/unresolved). The single source of truth consumed by the two behaviors below — centralizes all inertness so neither re-derives the window. |
| `syncLiveSeekableRange` | `behaviors/dom/sync-live-seekable-range.ts` | Consume `liveWindowFor`; `setLiveSeekableRange(start, end)` (+ defensive `duration = Infinity`) reactively on each window slide, including while paused. Composed before `seekToLiveEdge`. |
| `syncLiveSeekableRange` | `behaviors/dom/sync-live-seekable-range.ts` | Consume `liveWindowFor`; `setLiveSeekableRange(start, end)` reactively on each window slide, including while paused. Duration is owned solely by `updateMediaSourceDuration`. Composed before `seekToLiveEdge`. |
| `seekToLiveEdge` | `behaviors/dom/seek-to-live-edge.ts` | Consume `liveWindowFor`; one-time HOLD-BACK seek + the live-window playhead guard (reposition-on-window-exit, `repositionPolicy` seam). Gates on `mediaSource` open so the seek lands in the declared range. |
| `anchorLiveTracks` | `behaviors/anchor-live-tracks.ts` | Pin live track timelines to the SourceBuffer's native-PTS ground truth (first appended segment) or manifest estimate; re-pin per reload as the window slides |
| `resolveVideoTrack` / `resolveAudioTrack` / `resolveTextTrack` | `behaviors/resolve-track.ts` | Own the reload loop via `RecurringRunner`; reschedule defaults to `mediaPlaylistReloadDelay`; per-type independent |