wai-web: expose the byte-exact JPEG-AI mANS decode to wasm (decodeJpegAiMans) #51
2026-08-01
wai-web: expose the byte-exact JPEG-AI mANS decode to wasm (decodeJpegAiMans)
The ISO/IEC 6048 JPEG-AI entropy decoder (`wai::jpegai_mans`) as a browser entry: given the reference stream, the integer PMF rows, the per-distribution bounds, and the per-position σ indices + coded-position masks, it rebuilds the decode tables and returns the decoded residual symbols. The same pure-i64 Rust a native sink runs, compiled to wasm32 — no float, no ML runtime — so the symbols are byte-identical to the native decode, and their hash is portable across host and browser. Verified: the wasm decode reproduces the native cross-arch golden exactly (172 coded positions, 0 mismatches) and hashes to the same digest. Drives the /jpegai reproduction-vector demo. Co-Authored-By: Claude Opus 4.8 <[email protected]>