Tiles decode in parallel into private region buffers (Plane / MiInfo with a
frame-coordinate origin) that are merged afterwards; intra block copy frames
keep whole-frame buffers. Post-filter row bands run on a rayon pool (par.rs,
behind the `threads` feature, sequential on wasm32). Frames become jobs that
wait on the reference slots they read and run on frame worker threads, so
independent GOP layers decode concurrently; output stays in order and each
Picture carries the pts of its temporal unit (Decoder::decode_pts, flush,
flush_result). codecs::Av1Decoder passes pts through and drains on flush.
Oracle tests now compare 1 thread, many threads and libdav1d (bit-exact),
with new multi-tile fixtures and an ignored 1080p set. README records fps
before/after.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Brandon ThomasandClaude Opus 5.5
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