oxideav-prores

Pure-Rust Apple ProRes codec — decoder + encoder for all six ProRes video profiles (422 Proxy / LT / Standard / HQ and 4444 / 4444 XQ). 8-bit Y'CbCr only; alpha not currently carried.

Part of the oxideav framework but usable standalone. No C libraries, no FFI wrappers, no *-sys crates.

Status

Profile	FourCC	Input pixel format	State
422 Proxy	`apco`	`Yuv422P` 8-bit	decode + encode
422 LT	`apcs`	`Yuv422P` 8-bit	decode + encode
422 Standard	`apcn`	`Yuv422P` 8-bit	decode + encode
422 HQ	`apch`	`Yuv422P` 8-bit	decode + encode
4444	`ap4h`	`Yuv444P` 8-bit	decode + encode (no alpha)
4444 XQ	`ap4x`	`Yuv444P` 8-bit	decode + encode (no alpha)

The 4444 and 4444 XQ profiles share the same bitstream structure as 4444 — XQ is selected when the caller requests the highest quality tier and produces a larger packet at lower quantisation. Alpha-plane carriage (RDD 36 A' coding, a Yuva444P pixel format) is not implemented; the core PixelFormat enum does not yet carry a 4:4:4:4 variant.

The wire format is RDD 36-structural (frame header with icpf magic, picture header, slice table, per-MB 8x8 DCT blocks) but the entropy layer is a simplified exp-Golomb coding on zig-zag-scanned coefficients. Streams are round-trip-exact with this crate but not bit-compatible with Apple ProRes decoders.

Usage

[dependencies]
oxideav-core = "0.1"
oxideav-codec = "0.1"
oxideav-prores = "0.0"

Profile selection

The encoder picks a profile from the combination of pixel_format and bit_rate:

`pixel_format`	`bit_rate` hint (bps)	Picked profile
`Yuv422P`	`<= 70_000_000`	Proxy
`Yuv422P`	`<= 125_000_000`	LT
`Yuv422P`	`<= 180_000_000` or `None`	Standard
`Yuv422P`	`> 180_000_000`	HQ
`Yuv444P`	`>= 400_000_000`	4444 XQ
`Yuv444P`	anything else	4444

use oxideav_codec::CodecRegistry;
use oxideav_core::{CodecId, CodecParameters, Frame, PixelFormat};

let mut reg = CodecRegistry::new();
oxideav_prores::register(&mut reg);

let mut params = CodecParameters::video(CodecId::new("prores"));
params.width = Some(1920);
params.height = Some(1080);
params.pixel_format = Some(PixelFormat::Yuv422P);
params.bit_rate = Some(220_000_000); // -> 422 HQ

let mut enc = reg.make_encoder(&params)?;
# Ok::<(), Box<dyn std::error::Error>>(())

Codec id

Codec: "prores"; accepted pixel formats Yuv422P, Yuv444P.
Keyframe-only (all ProRes frames are intra).

License