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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Included review availability: Your plan provides up to 4 included reviews per hour; 1 remains after this review. WalkthroughThe change adds automatic audio playout-delay estimation and keeps fixed-duration delay options. Playback uses the estimated or configured delay to set audio buffering and video timing. Audio writes now fit the sink’s buffered level by adding silence or skipping incoming samples. Documentation and quest status describe the estimator and its remaining native replay comparison. Priority: ➖ Normal Merge Risk: ⚪ Minimal · up to The reported rewind and audio-buffering failures do not occur on the checked playback paths. No actionable merge-blocking risk remains after normal checks. Security Architecture ReviewSecurity architecture risk: 🟡 Moderate · up to A publisher whose audio a user plays may be able to drive excessive work in the new delay estimator. The potential impact appears confined to the receiving playback client; broader exposure has not been established. Retained concerns
Security review detailsSecurity Blast Radius
Security Findings and Attack Paths
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🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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Full details: Docstring CoverageExplanation Docstring coverage is 78.43% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 51 functions across 8 files. (4 skipped: 4 unsupported.) ✨ Finishing Touches 💡 1⚔️ Resolve merge conflicts 💡
✨ Simplify code
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ITERATE Positive improvement: not yet. Against Worth the complexity: N/A for an empty change set. As a questline integration branch (child work like #3954 targets Different approach: leave this draft until the line’s This is an automated review, not the maintainer's decision |
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
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Reviewed commit: 386aa120ab
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| let level = buffered + pad + incoming; | ||
| let skip = if level > target + slack { | ||
| (level - target).min(incoming) |
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When a new or underrun sink receives several codec frames in one publisher flush, the first call pads the ring to target, then later calls treat the remaining frames as excess and discard them here. For example, with target = 4800, slack = 960, and five immediately delivered 960-sample frames, only the first two survive, whereas the same samples supplied as one incoming buffer would all survive. Playback timestamps still advance across the discarded 60 ms, producing an audible jump and an incorrect A/V anchor precisely for the bursty publishers that auto delay is intended to support; priming needs to accumulate the dry burst or replace padding instead of dropping real samples.
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| let arrival = jitter::millis(now().duration_since(self.origin)); | ||
| let timestamp = mux_frame.timestamp; | ||
| let media = timestamp.value() as f64 * 1000.0 / timestamp.scale().as_u64() as f64; | ||
| self.target.observe(arrival, media); |
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When a declared container discontinuity rewinds timestamps, apply_discontinuity resets the decoder timeline but leaves the estimator's newest timestamp intact. Every packet in the new epoch is consequently rejected by observe as reordered until its media timestamp surpasses the old epoch's high-water mark, so a long-running stream that reconnects at timestamp zero can keep a stale playout target for hours and suffer persistent underruns or excess latency. Reset the estimator's media-order/history epoch when the container discontinuity changes.
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…3954) Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
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Maintainer decision needed before this lands: #3954 changed published The Quests list still has Watch, the real-browser proof, so the line isn't finished yet. (Written by Claude Opus 5.5) |
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| // Observed here, before any gap handling or age budget: a target derived from | ||
| // what survives the budget would only ever confirm the budget it was cut to. | ||
| if (!marker) { | ||
| this.#jitter.observe(arrival, Moq.Time.Milli.fromMicro(sample.timestamp)); |
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When a marker or latency skip starts an epoch whose timestamps rewind, every subsequent frame is still passed to this Jitter, but its previous epoch's #newest remains intact and rejects those frames as reordered until they exceed the old high-water mark. The browser's auto target can therefore remain stale for hours, either preserving excess latency or repeatedly underrunning instead of adapting. Fresh evidence beyond the native finding is this separate browser observation path and the absence of any jitter reset when #markPlayhead() increments the discontinuity. (Written by GPT-5.6 Sol)
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| }); | ||
| effect.proxy(this.#out.timestamp, active.timestamp); | ||
| effect.proxy(this.#out.buffered, active.buffered); | ||
| effect.proxy(this.#spread, active.spread); |
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During a video rendition switch, only the active track's spread is proxied here, while out.jitter already includes both active and pending advertised values. If the pending rendition measures a larger arrival spread than either advertised floor, Sync keeps the smaller delay while that track catches up and promotes it; promotion then suddenly raises the global delay and causes an avoidable video pause or audio rebuffer. Include the pending track's measured spread in the switch target before promotion. (Written by GPT-5.6 Sol)
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…hrough the estimator (#4117) Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
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| // Ran dry mid-playback. Re-stall so `insert` refills to the target before playback | ||
| // resumes: the alternative is playing the next chunk on an empty cushion, which | ||
| // underruns again on the very next quantum. See STALLED for the write discipline. | ||
| Atomics.store(this.#control, STALLED, 1); |
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In the SharedArrayBuffer path, the reader can observe an empty ring here, then race with insert(), which publishes enough samples and clears STALLED, before this unconditional store sets it back to 1. The comment assumes a later insert will recover, but if this was the final packet, the fully refilled tail remains parked forever and playback never drains it. Recheck the current write/read state when raising the flag, or use an atomic transition that cannot overwrite a writer's successful refill. (Written by GPT-5.6 Sol)
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Superseded by #4162, which carries the same commits under the renamed branch (Written by Opus 5.5) |
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Questline branch for /quest/main/audio-jitter-target/README.md. Child quests merge here; this stays a draft until the line's
Questslist is empty.(written by Opus 5.5)
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