feat(video): fork v4l in-tree with checked-in V4L2 bindings - #3867
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WalkthroughThe pull request adds the Linux-only Priority: ➖ Normal Merge Risk: 🔵 Low · up to The runtime implementation remains unaffected, but the cross-target test should be corrected before merging if those Linux targets are supported. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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Full details: Docstring CoverageExplanation Docstring coverage is 28.81% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 177 functions across 45 files. (14 skipped: 14 unsupported.) ✨ Finishing Touches 💡 1✨ Simplify code
🛠️ Fix failing CI checks 💡
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MERGE Positive improvement? Yes. Vendoring Worth the complexity? The ~7.5k-line delta looks large, but almost all of it is the MIT fork plus one generated bindings file—the same pattern as Different approach better? Workspace Verdict: merge. Complexity is justified by the packaging goal and existing in-tree precedent; patch/sys-only alternatives do not solve This is an automated review, not the maintainer's decision |
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Verdict: request changes |
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All three findings applied in e83027b: (written by Opus 5) |
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No issues found. |
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
moq-video's `capture` and `v4l2` features pulled the `v4l` crate, whose sys dependency runs bindgen over the kernel's videodev2.h at build time, so every Linux build host needed libclang and the kernel headers. That was the one cost that kept `cargo install moq-cli` from ever shipping capture by default. rs/moq-v4l forks `v4l` 0.14 with the bindings generated once and checked in, the way rs/moq-nvenc forks its SDK. The output is arch-independent (no layout tests, fixed-width integers, `timeval`/`timespec` from libc) and the regeneration script sits beside it. Only the raw-ioctl backend survives; nothing links at build time, and the crate is an empty stub off Linux. The fork also completes the VIDIOC request table, so moq-video's hand-built DQEVENT/SUBSCRIBE_EVENT/G_SELECTION/DECODER_CMD codes and their test move into the crate. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
moq-video's README still said `capture` pulls V4L2 and libclang build dependencies, and moq-v4l's crate docs pointed at examples the fork does not carry. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Three comments still described the build cost the fork removes, and one still named the `v4l` crate's helpers. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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No issues found. |
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Actionable comments posted: 1
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
In `@rs/moq-v4l/src/v4l2/vidioc.rs`:
- Around line 163-169: Update the ioctl assertions around VIDIOC_QUERYCAP and
the related constants to cast every actual ioctl value to u32. Make VIDIOC_S_FMT
and VIDIOC_DQEVENT expectations target_pointer_width-aware, using the 64-bit and
32-bit encoded values respectively; leave the other five expected values
unchanged apart from the casts.
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Cargo.tomldoc/bin/cli.mddoc/lib/rs/moq-video.mdnix/overlay.nixquest/future/video-vaapi.mdquest/next/README.mdquest/next/capture-v4l-bindings.mdquest/next/cli-packaging.mdrs/moq-cli/Cargo.tomlrs/moq-ffi/Cargo.tomlrs/moq-transcode/Cargo.tomlrs/moq-v4l/Cargo.tomlrs/moq-v4l/LICENSErs/moq-v4l/README.mdrs/moq-v4l/src/buffer.rsrs/moq-v4l/src/capability.rsrs/moq-v4l/src/context.rsrs/moq-v4l/src/control.rsrs/moq-v4l/src/device.rsrs/moq-v4l/src/format/colorspace.rsrs/moq-v4l/src/format/description.rsrs/moq-v4l/src/format/field.rsrs/moq-v4l/src/format/fourcc.rsrs/moq-v4l/src/format/mod.rsrs/moq-v4l/src/format/quantization.rsrs/moq-v4l/src/format/transfer.rsrs/moq-v4l/src/fraction.rsrs/moq-v4l/src/frameinterval.rsrs/moq-v4l/src/framesize.rsrs/moq-v4l/src/io/mmap/arena.rsrs/moq-v4l/src/io/mmap/mod.rsrs/moq-v4l/src/io/mmap/stream.rsrs/moq-v4l/src/io/mod.rsrs/moq-v4l/src/io/traits.rsrs/moq-v4l/src/io/userptr/arena.rsrs/moq-v4l/src/io/userptr/mod.rsrs/moq-v4l/src/io/userptr/stream.rsrs/moq-v4l/src/lib.rsrs/moq-v4l/src/memory.rsrs/moq-v4l/src/parameters.rsrs/moq-v4l/src/sys/bindgen.shrs/moq-v4l/src/sys/mod.rsrs/moq-v4l/src/sys/videodev2.rsrs/moq-v4l/src/timestamp.rsrs/moq-v4l/src/v4l2/api.rsrs/moq-v4l/src/v4l2/mod.rsrs/moq-v4l/src/v4l2/videodev.rsrs/moq-v4l/src/v4l2/vidioc.rsrs/moq-v4l/src/video/capture/mod.rsrs/moq-v4l/src/video/capture/parameters.rsrs/moq-v4l/src/video/macros.rsrs/moq-v4l/src/video/mod.rsrs/moq-v4l/src/video/output/mod.rsrs/moq-v4l/src/video/output/parameters.rsrs/moq-v4l/src/video/traits.rsrs/moq-video/Cargo.tomlrs/moq-video/README.mdrs/moq-video/src/capture/v4l2.rsrs/moq-video/src/decode/backend/v4l2.rsrs/moq-video/src/encode/backend/v4l2.rsrs/moq-video/src/lib.rsrs/moq-video/src/v4l2.rs
💤 Files with no reviewable changes (2)
- quest/next/capture-v4l-bindings.md
- quest/next/README.md
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Co-authored-by: MiMo-V2.6-Flash <noreply@opencode.ai>
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Public API: unchanged ( (Written by MiMo-V2.6-Flash) |
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Completes
quest/main/capture-v4l-bindings.Problem
moq-video's
captureandv4l2features pulled thev4lcrate, whose sys dependencyv4l2-sys-mitruns bindgen over the kernel'svideodev2.hat build time. Every Linux build host needed libclang plus the kernel headers, which is the one cost that keptcargo install moq-clifrom ever shipping capture by default (#3852).Approach
rs/moq-v4lforksv4l0.14 with the bindings generated once and checked in, thers/moq-nvencpattern. A workspace[patch]was not an option: it reaches only in-tree builds, andv4lnames its sys crate by crates.io name so the sys crate cannot be swapped alone.src/sys/videodev2.rs, generated bysrc/sys/bindgen.sh(bindgen 0.73.2, kernel 6.12 headers). No layout tests, fixed-width integers,timeval/timespecfromlibc, so one file serves every 64-bit Linux target. The arm64 and amd64 outputs are byte-identical.libv4llink-time backend is gone. Nothing links at build time. The crate is#![cfg(target_os = "linux")], an empty stub elsewhere.VIDIOC_*table (79-104), so moq-video's hand-builtDQEVENT/SUBSCRIBE_EVENT/G_SELECTION/DECODER_CMDcodes and their test move into the crate.v4l::formoq_v4l::andv4l_sysforsys. No logic changes.bindgen0.65,v4l,v4l2-sys-mit,which,lazycell,peeking_take_while,homeleaveCargo.lock.captureandv4l2stay opt-in: turning them on by default isquest/next/cli-packaging.md's call, which now lists only the ALSA quest under Required.Impact
moq-v4l0.0.1 (MIT, fork ofv4l). moq-video's feature names and semantics are unchanged; only their build cost drops.nix/overlay.nixkeepsbindgenHookfor libmoq because ofmoq-vaapi.Verification
In a
rust:1.95-bookwormcontainer with no libclang:cargo clippy -p moq-v4l --all-targets -- -D warningsandcargo clippy -p moq-video --no-default-features --features capture,v4l2 --all-targets -- -D warningspass.cargo test -p moq-v4l: the VIDIOC pin test plus 17 doctests pass.cargo tree -p moq-video --features capture,v4l2 -e build,normal -i bindgenreports no such package.On Linux after the rebase:
just check(including thejust rs capturegate) andjust testpass. No device was opened; the M2M and camera paths are import renames only.Follow-ups
quest/next/cli-packaging.mdcan now considerv4l2default-on alongsidecapture.(Written by Opus 5)
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