forked from unom/punktfunk
enricobuehler
0a359525a7
Adapted from cros-codecs decoder/stateless/h264.rs (POC 8.2.1, ref lists 8.2.4 incl. modification, sliding-window + MMCO/LTR marking 8.2.5, frame_num-gap handling 8.2.5.2), minus the fd-coupled backend trait. H264Planner::plan_au maps one wire AU to picture params, per-slice byte ranges + ref lists keyed by stable PicIds, and a DPB update; recovery- point SEI parsing is new code (upstream reads no SEI payloads). Concealment posture, deliberately different from upstream's aborts: frame_num gaps, failed RPLM/MMCO and mis-split AUs degrade to warnings the session turns into recovery asks, gap placeholders substitute in-place so ref_idx mapping never shifts, and DPB outputs queued during a failed AU survive to the next plan. An adversarial review round fixed 11 findings before this commit; one was an upstream cros-codecs bug our conformance-window test exposed (display_resolution double-subtracts the crop offset and underflow- panics — PROVENANCE deviation #6, worth reporting upstream). Gates: fmt clean, clippy -D warnings zero, 45+24 tests green on macOS and the linux/amd64 container.