Correct video recovery and reduce browser media overhead - #140
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📝 WalkthroughWalkthroughThe change adds shared H.264 admission and recovery handling, BGRA WebCodecs readback with RGBA fallback, reusable web audio output buffers, callback diagnostics, capture lifecycle tests, and CI integration. ChangesMedia pipeline
Estimated code review effort: 5 (Critical) | ~90 minutes Merge Risk: 🔵 Low · up to The media implementation is mergeable, but the browser transform test may obscure unsupported metadata with a misleading failure. Sequence Diagram(s)Audio diagnosticssequenceDiagram
participant CallDevice
participant Output
participant Diagnostics
participant PlatformTimer
CallDevice->>Output: fill and write audio block
CallDevice->>Diagnostics: record callback statistics
PlatformTimer->>Diagnostics: report interval statistics
CallDevice->>Diagnostics: report final statistics
H.264 and WebCodecs recoverysequenceDiagram
participant Decoder
participant AccessUnits
participant Recovery
participant Readback
Decoder->>AccessUnits: prepare encoded access unit
AccessUnits-->>Decoder: prepared picture or recovery result
Decoder->>Recovery: request recovery when required
Decoder->>Readback: publish decoded frame
Readback->>Readback: retry BGRA copy as RGBA when rejected
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 60.14% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 143 functions across 26 files. (7 skipped: 7 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
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Inline comments:
In `@crates/gui/tests/webcodecs/readback.rs`:
- Around line 64-66: Reorder the attributes on production_readback_benchmark so
#[cfg(feature = "benchmarks")] appears before #[wasm_bindgen_test"], ensuring
the test registration is removed when the benchmarks feature is disabled.
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Inline comments:
In `@crates/gui/tests/webcodecs/fixture.js`:
- Around line 185-188: Update the benchmark cleanup finally block to restore
VideoFrame.prototype.copyTo from this.originalCopy and then clear
this.originalCopy, including when benchmark rejects before the earlier setup
point. Preserve the existing template, encoder, and decoder cleanup.
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Verification: audio/session/video/core native suites pass, session browser suite passes 18 tests, audio lifecycle browser test passes, GUI video suites pass, workspace Clippy denies warnings, formatting and machete pass, nightly wasm GUI check passes. No physical-camera LED verification is claimed. |
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Inline comments:
In `@crates/gui/tests/webcodecs/fixture.js`:
- Around line 189-194: Move the cleanup try/finally in the decoded-format test
setup to encompass format support checks, codec construction, and both configure
calls. Keep the codec reference and original VideoFrame.prototype.copyTo value
scoped outside the try so finally restores the override and closes any partially
created codec when setup fails.
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Inline comments:
In `@crates/gui/tests/webcodecs/transform.js`:
- Around line 18-21: Update the VideoFrame setup in the transform test to verify
that the constructed frame preserves the requested rotation and flip metadata
before exercising the oversized-frame failure path. Add assertions for the
frame’s display transform values so unsupported VideoFrameInit members are
reported at metadata validation rather than later at latest_display_transform.
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1 participant
Dependency
Stacked on #139 so its production-tested lifecycle changes remain separate. Merge #139 first, then retarget this PR to main.
Changes
Evidence
The preview recording still contained 11 remote decoder failures and substantial copyTo time. Those observations motivated the work but do not establish which encoded unit caused a failure.
Tests reproduced parameter-only recovery failure and caught two implementation regressions before publication. Repeated SPS/PPS must not stop valid IDR-to-delta decoding, and rewriting an IDR must not discard a PPS used by a later delta. Native and browser tests compare direct and prepared decoding from generated media.
Four interleaved synthetic Chrome runs measured 6.4-10.5% lower mean callback-to-publication time for unrotated BGRA. copyTo itself did not consistently improve; avoiding the Rust swizzle provides the measured benefit. This is not a measured live-call FPS gain.
Across 1,000 synthetic audio blocks, sample-buffer backing allocations fall from 1,000 to one at setup. An alternating starvation test falls from 500 warning decisions to three interval reports and one final total, with all counters retained. Copies and temporary binding views remain.
Verification
Scope
No live post-fix WhatsApp call or native daemon CPU profile was recorded. This helper checks bounded admission headers and parameter references, not full H.264 syntax or complete WhatsApp receive-policy parity. No codec negotiation, frame rate, resolution or encoded quality setting changed.
Upstream loss metadata after receive-queue overflow and whole-access-unit loss handling remain separate work. AudioWorklet, GPU-native video presentation and directional local-camera stop also remain outstanding. See docs/media-recovery.md for the measured scope and remaining limitations. No private logs, traces or captured media were committed.
Summary by cubic
Fixes video recovery so transport keyframe flags no longer count as proof that a frame is decodable, and trims browser-side media overhead and call-setup leaks.
Video recovery:
Browser media:
benchmarksfeature so normal browser test runs skip them, and restores thecopyTooverride if a benchmark bails.whatsapp-rustmain.Written for commit 05b8e10. Summary will update on new commits.
Summary by CodeRabbit
New Features
Bug Fixes
Documentation