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Dylan M. Taylor 0226f1d03e craft-video: H.264 decoder from FilmCraft, with DeckCraft's hardening (h264-decode) (#834 )

* craft-video: H.264 decoder from FilmCraft (`h264-decode` feature)

FilmCraft's crates/h264 at 4c0d2ad7 becomes craft_video::h264::decode. The encoder moves to
h264/encode and is still exported from craft_video::h264. Feature h264 now turns on h264-decode
and h264-encode, so either half can be built without the other.

Without the threads feature a reference row that was never published read through expect();
it now reads as a gray row. craft_video::budget (the picture memory budget from DeckCraft's
bitstream crate) is added for the next commit. craft-video is built at opt-level 3 in the dev
profile, as FilmCraft built its codecs.

* craft-video: H.264 decoder hardening from DeckCraft's copy

- The picture store (DPB, current picture, pictures in flight or queued for output) is checked
  against a memory budget before a picture is allocated; Decoder::set_memory_budget.
- configure_avcc checks every entry before handling any: SPS NAL units in the first list, PPS in
  the second. A picture slice in the record starts no picture.
- The inverse transforms clamp coefficients to the spec's r range instead of overflowing.
- Temporal direct motion vectors are scaled in i32 and clipped to the spec range.
- slice_qp_delta is added with a checked add.
- A picture job sets up its picture state inside the panic guard.

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examples

craft-video: H.264 decoder from FilmCraft, with DeckCraft's hardening (h264-decode) (#834 )

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src

craft-video: H.264 decoder from FilmCraft, with DeckCraft's hardening (h264-decode) (#834 )

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tests

craft-video: H.264 decoder from FilmCraft, with DeckCraft's hardening (h264-decode) (#834 )

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tools

craft-video: HEVC decoder from FilmCraft, with DeckCraft's hardening (hevc-decode) (#828 )

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Cargo.toml

craft-video: H.264 decoder from FilmCraft, with DeckCraft's hardening (h264-decode) (#834 )

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README.md

craft-video: H.264 decoder from FilmCraft, with DeckCraft's hardening (h264-decode) (#834 )

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README.md

craft-video

Clean-room pure-Rust video codecs for the Craft apps, one feature per codec: DNxHD/DNxHR, VP8, ProRes and H.264.

Input and output are byte slices and planar sample buffers; the crate opens no files itself and performs no filesystem I/O.
Implemented from published standards and RFCs (SMPTE ST 2019-1, RFC 6386, SMPTE RDD 36 and ITU-T H.264).
Tested against ffmpeg as an external oracle with roundtrips, hostile fuzzing, and conformance vectors. No unsafe, no panics on corrupt streams. Builds for wasm32-unknown-unknown.
Containers (MP4/MOV, Matroska/WebM), bit-level I/O (craft_media::bitstream) and shared identifiers (CodecId, CodecParams) come from craft-media.

Cargo features

No codec feature is on by default.

Feature	Module	Codec
`dnx`	`dnx`	Avid DNxHD / DNxHR (SMPTE ST 2019-1 VC-3): decoder and encoder
`vp8`	`vp8`	VP8 (RFC 6386): decoder
`prores`	`prores`	Apple ProRes (SMPTE RDD 36): decoder and encoder
`h264`	`h264`	ITU-T H.264 / AVC: decoder (`h264-decode` alone) and encoder (`h264-encode` alone)
`hevc`	`hevc`	ITU-T H.265 / HEVC: decoder (`hevc-decode` alone) and encoder (`hevc-encode` alone)
`vp9`	`vp9`	VP9: decoder (`vp9-decode` alone) and encoder (`vp9-encode` alone)
`av1`	`av1`	AV1 (AOMedia Video 1): encoder
`threads`	—	Multi-threaded slice/row parallelism via `rayon`