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T

Brandon ThomasandClaude Opus 5.5 9c8de5468b M2.2/M2.3: CAVLC macroblock decoding, intra and inter prediction, DPB

- CAVLC residual parsing (coeff_token / total_zeros / run_before tables taken
  from the spec text, level decoding with escape codes), macroblock layer for
  I/P/B slices (mb_type, sub_mb_type, mb_pred, sub_mb_pred, me(v) cbp,
  mb_qp_delta), I_PCM
- intra prediction: Intra4x4 (9 modes), Intra8x8 with reference filtering,
  Intra16x16, chroma; constrained_intra_pred
- dequantisation with flat/custom scaling matrices; 4x4, 8x8, luma DC
  Hadamard and 2x2 chroma DC inverse transforms
- inter prediction: median / directional mv prediction, P_Skip, B spatial and
  temporal direct (direct_8x8_inference), B_Skip, 6-tap luma and bilinear
  chroma interpolation, explicit and implicit weighted prediction
- reference lists (init + modification), DPB with sliding window, all MMCOs,
  frame_num gaps, bumping / max_num_reorder_frames output order, IDR and
  no_output_of_prior_pics
- public Decoder/Picture API (Annex-B and avcC input, pts passes through
  reordering)

Deblocking (M2.5) follows in the next commit, so the bit-exact fixtures in
this commit are the no-deblock ones. CABAC slices return Unsupported.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

2026-09-30 06:14:18 -04:00