open-standards/wai/live-conformance/direction

live-conformance/direction — direction records

The corpus of extensions/direction.md §14, in one file, vectors.json: the model file its layers are generated with (models, its sha256 and its file as text), the pictures given as they are (pictures, each its sha256 and its rgb8 buffer in hexadecimal), the framing measure of §7 alone (measures, each a frame size, a box and the size and position it measures), the interpolations of §5.2 alone (interpolations, each its interp, its from and to values, n and d, and its value), and the vectors, each a case of §12.1 and what a verifier gives it.

A case holds its policy (require); the directed output record and the direction records it holds, each as a JSON text; the models it holds, each by the SHA-256 of a file in models; and the pictures it holds, each by the SHA-256 of a buffer in pictures. Frames are 64 × 36 pixels at 24 frames a second, so every frame of every exact case recomputes.

Direction equivalence. For each vector, a conforming verifier reaches the outcome it states:

• refuse: the reason and where, at: ["output"], ["record", i], ["direction", k], ["layer", i], ["clip", i], ["clip", i, t], ["timeline"], ["timeline", i], ["governs", i] or ["policy"];
• accept: the statements of §12.4: the directed output's link hash (output); its status, generator and class; each direction record's kind, link, director and levels; each element's record, element, level, director and governed frames; the cuts; the frame map, one entry per output frame, with the frames it shows and who it is directed_by at each level; the SHA-256 of every output frame's RGB8 samples (frame_sha256), or null where the outcome is attested; each layer's status (layers); and the C2PA statements of §11.1 (c2pa), each its director and its JCS text.

A verifier that measures another class, interpolates another value, or reaches another outcome, reason, place or statement does not conform.

Provenance. wai_direction_vectors gen writes vectors.json from records authored in code: every key is SHA-256 of the corpus's label and an index, the drawn reference picture is SHA-256 output of a label, every other picture is made by wai.generate.spectral with the model file of its conformance vector (wai-rs/tests/vectors/generate/generate_spectral_model.json, held here byte for byte in models), the attested case's frames are SHA-256 output of a label, every time is a constant, and Ed25519 signing is deterministic, so the file is the same bytes on every machine. Every picture is named by the SHA-256 of its RGB8 samples, and every output frame of an exact case by the SHA-256 stated in frame_sha256.

python3 -I ../direction_verify.py .