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Christian PillsburyandClaude Opus 4.8
b32783fbd7
The model timeline (an averageDuration×sequence estimate) could drift from the SourceBuffer's native-PTS timeline across reloads. At ENDLIST the drifted model placed the final segments behind the playhead, so the loader skipped them and end-of-stream's isLastSegmentAppended never satisfied — playback stalled in `waiting`, duration stuck at Infinity, `ended` never fired. Pin the model to ground truth: once a segment is buffered, re-origin the track onto where it actually landed (anchorTrackToBufferedSegment), correlated via bufferedAnchorFor over the buffer actor's DOM-free snapshot. Pin once per track (the offset is constant under no-discontinuity); the parser's now-PDT-exact carry-forward maintains it. The sequence estimate stays the pre-buffer bootstrap. anchorLiveTracks stays DOM-free — the engine injects the resolver from the buffer actors; no timestampOffset (preserves A/V sync). The same pin serves non-zero-PTS VOD. Smoke-tested on a live Mux LL-HLS stream: durationchange → finite duration → plays out → `ended`, no stall. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
34 lines
1.2 KiB
TypeScript
34 lines
1.2 KiB
TypeScript
import { describe, expect, it } from 'vitest';
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import { bufferedAnchorFor } from '../buffered-anchor';
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describe('bufferedAnchorFor', () => {
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it('pairs the leading-edge segment with its actual native-PTS start', () => {
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// Model says the latest segment sits at 110 (+10s long); the buffer's real
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// leading edge is 550 → it actually starts at 540 (a +430 native-PTS offset).
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const anchor = bufferedAnchorFor(
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[
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{ id: 's1', startTime: 100, duration: 10 },
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{ id: 's2', startTime: 110, duration: 10 },
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],
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[{ start: 530, end: 550 }]
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);
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expect(anchor).toEqual({ segmentId: 's2', actualStart: 540 });
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});
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it('uses the max end across discontiguous ranges', () => {
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const anchor = bufferedAnchorFor(
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[{ id: 's2', startTime: 110, duration: 10 }],
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[
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{ start: 530, end: 545 },
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{ start: 548, end: 552 },
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]
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);
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expect(anchor?.actualStart).toBe(542); // 552 − 10
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});
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it('returns undefined before anything is buffered', () => {
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expect(bufferedAnchorFor([{ id: 's1', startTime: 0, duration: 10 }], [])).toBeUndefined();
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expect(bufferedAnchorFor([], [{ start: 0, end: 10 }])).toBeUndefined();
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});
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});
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