nx_h264_poc.nx

nx_h264_poc.nx -- H.264 Picture Order Count (POC type 0, spec 8.2.1.1) + B-slice reference list construction (8.2.4.2.3). POC gives display order from decode order; the ref lists L0/L1 give a B-slice its past/future predictors. Reusable by the B-frame decoder. poc_type0: state[0]=prevPicOrderCntMsb, state[1]=prevPicOrderCntLsb (from the last REFERENCE pic; reset to 0 at an IDR). Non-reference pics (B here) read state but do NOT update it. B ref lists: L0 = {refs POC<curr, desc} ++ {refs POC>curr, asc}; L1 = {POC>curr, asc} ++ {POC<curr, desc}. genealogy_id: itu_t_h264_sec8_2_poc_and_reflists license_tier: ORIGINAL