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Melchi Aaron Zedek bb57d422d0 craft-video: HEVC 4:2:2 8/10-bit decoding (Main 4:2:2 10) (#1087 )

Port of storytold/filmcraft#1952, reviewed and approved there before the
decoder moved to craft-libs. 4:2:2 streams that use no range-extension
coding tools (what cameras and libx265 write) now decode:

- chroma geometry from the SPS chroma format (ChromaFormat shifts) in the
  picture store, intra, inter, transform tree, deblocking and SAO;
- Table 8-3 IntraPredModeC mapping for ChromaArrayType 2;
- stacked chroma transform blocks with their second cbf flags;
- chroma QP = Min(qPi, 51) for non-4:2:0 (Table 8-10 applies to 4:2:0 only);
- chroma motion vectors scaled per axis;
- a PPS that scales SAO offsets (a RExt tool) is refused as unsupported.

Tests: 22 libx265 4:2:2 fixtures (8- and 10-bit) compared sample-exactly
with ffmpeg, the Table 8-3 derivation, and the SAO offset scale check.

2026-11-11 23:52:20 -05:00

examples

craft-video: FilmCraft's later H.264 encoder work (High 10, threads, sub-pel diamond) and its H.264 and ProRes tests

2026-11-11 22:43:42 -05:00

src

craft-video: HEVC 4:2:2 8/10-bit decoding (Main 4:2:2 10) (#1087 )

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tests

craft-video: HEVC 4:2:2 8/10-bit decoding (Main 4:2:2 10) (#1087 )

2026-11-11 23:52:20 -05:00

tools

craft-video: AV1 decoder from FilmCraft, with DeckCraft's hardening (av1-decode) (#836 )

2026-11-11 17:43:10 -05:00

Cargo.toml

craft-video: FilmCraft's later H.264 encoder work (High 10, threads, sub-pel diamond) and its H.264 and ProRes tests

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README.md

craft-video: AV1 decoder from FilmCraft, with DeckCraft's hardening (av1-decode) (#836 )

2026-11-11 17:43:10 -05:00

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
`apv`	`apv`	APV (Advanced Professional Video, RFC 9924): decoder (`apv-decode` alone) and encoder (`apv-encode` alone)
`vp8`	`vp8`	VP8 (RFC 6386): decoder
`mpeg2`	`mpeg2`	MPEG-2 video (ITU-T H.262) and MPEG-1 video (ISO/IEC 11172-2): 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): decoder (`av1-decode` alone) and encoder (`av1-encode` alone)
`threads`	—	Multi-threaded slice/row parallelism via `rayon`