X 264 CODE TRACING 1 Group 5 Block

X 264 CODE TRACING 1 Group： 5 Block： 3 9862639 盧偉民

TRACE FUNCTION x 264_cabac_mb_type p x 264_cabac_encode_decision_noup p x 264_cabac_encode_flush p x 264_cabac_encode_terminal p 2

FUNCTION結構圖 x 264_cabac_mb_type _intra x 264_cabac_encode_ decision_flush x 264_cabac_encode_d ecision_terminal x 264_cabac_encode_ decision_noup x 264_cabac_ putbyte x 264_cabac_encod e_renorm x 264_cabac_siz e_decision_nou p x 264_cabac_enco de_decision x 264_cabac_encode_ decision_c 3

THE CABAC FRAMEWORK 4

THE CABAC FRAMEWORK 5

TRACE FUNCTION x 264_cabac_mb_type p x 264_cabac_encode_decision_noup p x 264_cabac_encode_flush p x 264_cabac_encode_terminal p 6

X 264_CABAC_MB_TYPE Target 依據slice和macroblock type不同設定不同 的context index，並將每種macroblock type轉化成bin string，根據bin和context index呼叫x 264_cabac_encode_decision_c 作binary arithmetic coding Input x 264_t *h , x 264_cabac_t *cb Output none In which file encodercabac. c caller x 264_macroblock_write_cabac() 7

X 264_CABAC_MB_TYPE 8

X 264_CABAC_MB_TYPE 9

X 264_CABAC_MB_TYPE 10

X 264_CABAC_MB_TYPE 11

X 264_CABAC_MB_TYPE 12

X 264_CABAC_MB_TYPE else //if( h->sh. i_type == SLICE_TYPE_B ) B_DIRECT B_L 0_L 1 B_L 0_BI B_L 1_L 0 B_L 1_BI B_BI_L 0 B_BI_L 1 B_BI_BI B_8 x 8 B_SKIP = 7, = 8, = 9, = 10, = 11, = 12, = 13, = 14, = 15, = 16, = 17, = 18, 13

TRACE FUNCTION x 264_cabac_mb_type p x 264_cabac_encode_decision_noup p x 264_cabac_encode_flush p x 264_cabac_encode_terminal p 14

X 264_CABAC_ENCODE_DECISION_NOUP u (a)在commoncabac. h 檔中，此函式被定義為 x 264_cabac_encode_decision 15

X 264_CABAC_ENCODE_DECISION_NOUP u (a)在commoncabac. h 檔中，此函式被定義為 x 264_cabac_encode_decision 16

X 264_CABAC_ENCODE_DECISION_NOUP u (b)在encoderrdo. c 檔中，此函式定義為 x 264_cabac_size_decision_noup 17

TRACE FUNCTION x 264_cabac_mb_type p x 264_cabac_encode_decision_noup p x 264_cabac_encode_flush p x 264_cabac_encode_terminal p 18

X 264_CABAC_ENCODE_FLUSH Target 當macroblock type為I_PCM時，這時候並 不會做DCT transform或quantization，而 是直接傳送pixel value，所以在傳送前必 須終止CABAC。 Input x 264_t *h , x 264_cabac_t *cb Output None In which file commoncabac. c Caller x 264_cabac_mb_type_intra() 19

TRACE FUNCTION x 264_cabac_mb_type p x 264_cabac_encode_decision_noup p x 264_cabac_encode_flush p x 264_cabac_encode_terminal p 20

X 264_CABAC_ENCODE_TERMINAL Target 主要將range值減 2，並呼叫x 264_cabac _encode_renorm這個函式renormalization， 目的是希望讓low和range保持在一定範圍 內 Input x 264_cabac_t *cb Output none In which file commoncabac. c caller x 264_cabac_mb_type_intra() 21

X 264_CABAC_ENCODE_TERMINAL 22