Module fourcc 

The entire experimental surface of this format, in one place.

AV2F is not an AOM standard. AVIF is defined by a published AOM specification that fixes its brand (avif), item type (av01) and configuration box (av1C); no equivalent document exists for AV2 — or at least none that this crate’s authors have seen. Every four-character code below is therefore chosen, not specified.

They are gathered here, and nowhere else, so that the day a real specification appears the change is this file and nothing more. Nothing in the reader or writer hard-codes a four-character code; they all read these constants.

Until then, files produced by this crate are readable by this crate and by nothing else. See the crate README.

Constants

BRAND

Major brand written into ftyp, and the brand a reader requires.

COMPATIBLE_BRANDS

Compatible brands written into ftyp after the major brand.

CONFIG_BOX

Codec configuration property box type.

CONFIG_VERSION

Marker byte written into the configuration record so a future reader can tell files made by this crate apart from anything a real specification later defines. Bumped only if the layout of our config record changes.

EXTENSION

Recommended file extension.

ITEM_TYPE

infe item type for the coded image item.