黄埔做网站,深圳ccd设计公司官网,网站 网页,上海知名的网站建设分析一段H264视频数据 Posted on 2007-05-31 09:42 vcommon 阅读(1968) 评论(8) 编辑 收藏 引用 分析 00 00 00 01 67 42 00 1E 99 A0 B1 31 00 00 00 01 H264的数据流分为两种#xff0c;一种是NAL UNIT stream(RTP),一种是 bits stream, 两者可以互相转换。我们分析的这个… 分析一段H264视频数据 Posted on 2007-05-31 09:42 vcommon 阅读(1968) 评论(8) 编辑 收藏 引用
分析 00 00 00 01 67 42 00 1E 99 A0 B1 31 00 00 00 01 H264的数据流分为两种一种是NAL UNIT stream(RTP),一种是 bits stream, 两者可以互相转换。我们分析的这个是 bit stream,根据Annex B 00 00 00 01 67 42 00 1E 99 A0 B1 31 是 一个NAL在两个00 00 00 01之间 0110 0111 0100 0010 0000 0000 0001 1110 1001 1001 1010 0000 1011 0001 0011 0001 forbidden_zero_bit1 0 nal_ref_idc2 11 nal_unit_type5 0 0111seq_parameter_set_rbsp( ) 所以 processSPS profile_idc(8):420100 0010 constraint_set0_flag(1):0 constraint_set1_flag(1):0 constraint_set2_flag(1):0 constraint_set3_flag(1):0 reserved_zero_4bits(4):0 level_idc(8):1E seq_parameter_set_id(UE(V)): ue(v): unsigned integer Exp-Golomb-coded syntax element with the left bit first. The parsing process for this descriptor is specified in subclause 9.1 uvlC: 1001根据Table9.1 value 0,只占1bit. 根据profile_idc忽略掉一部分。 log2_max_frame_num_minus4(ue(v): 001 1001,len 5,value 5 pic_order_cnt_type(ue(v)):01 1010,len 3,value 2 根据pic_order_cnt_type忽略几个参数 num_ref_framesue010,len 3,value 1 0000 1011 0001 0011 0001 gaps_in_frame_num_value_allowed_flag(1) 0 pic_width_in_mbs_minus1(ue):000 1011 ,len 7,value 10; pic_height_in_map_units_minus1(ue):0001 001,len 7,value 8 frame_mbs_only_flag(1) 1 忽略1 direct_8x8_inference_flag1:0 忽略 vui_parameters_present_flag(1):0 忽略 NALU结束 68 CE 38 80 00 00 00 01 0110 1000 forbidden_zero_bit1 0 nal_ref_idc2 11 nal_unit_type5 01000pic_parameter_set_rbsp( ),7.3.2.2 1100 pic_parameter_set_id (ue)0 seq_parameter_set_id(ue)0 entropy_coding_mode_flag(1) :0, 重要的flag,0 表示编码Exp-Golomb coded and CAVLC,1表示CABAC pic_order_present_flag(1):0 1110 num_slice_groups_minus1(ue):0 忽略 num_ref_idx_l0_active_minus1ue:0 num_ref_idx_l1_active_minus1(ue):0 weighted_pred_flag(1);0 0011 1000 1000 0000 weighted_bipred_idc(2):00 pic_init_qp_minus26 /* relative to 26 */(se):0 pic_init_qs_minus26 /* relative to 26 */(se):0 chroma_qp_index_offset(se):0 deblocking_filter_control_present_flag(1);0 constrained_intra_pred_flag(1):0 redundant_pic_cnt_present_flag(1):0 忽略 NALU结束 65 88 80 21 71 27 1B 88…….3888*16 byte 650110 0101 forbidden_zero_bit1 0 nal_ref_idc2 11 nal_unit_type5 0 0101slice_layer_without_partitioning_rbsp( ),IDR浈 Slice Slice_Header: first_mb_in_slice(ue):0 slice_type(ue):000 1000 7 pic_parameter_set_id(ue) 0 80 21000 0000 0010 0001 frame_num(u(v): frame_num is used as an identifier for pictures and shall be represented by log2_max_frame_num_minus4 4 bits,9 bits 0 忽略 if( nal_unit_type 5 ) //IDR frame idr_pic_id(u(e)):0 忽略N多 ref_pic_list_reordering( ) 见7。3。3。1忽略Islice,SI slice,B slice nal_ref_idc 11 所以dec_ref_pic_marking( ) nal_unit_type 5所以 no_output_of_prior_pics_flag10 long_term_reference_flag10 忽略 。。71 27 001 0111 0001 0010 0111 slice_qp_deltasev001 01 4-2 忽略 slice_data( ):7.3.4 对I-Slice:忽略N多 进入if( moreDataFlag ) { if( MbaffFrameFlag ( CurrMbAddr % 2 0 | | ( CurrMbAddr % 2 1 prevMbSkipped ) ) )mb_field_decoding_flag macroblock_layer( )} mb_field_decoding_flag忽略 macroblock_layer( ) mb_typeuev0 mb_pred( mb_type ) prev_intra4x4_pred_mode_flag[ luma4x4BlkIdx ] 1bit, 对babac是ae(v):1 1 27:0001 0010 0111 prev_intra4x4_pred_mode_flag[ 1 ] : 0001,0,001 0010 0111 prev_intra4x4_pred_mode_flag[ 2 ] : 0010,0,010 prev_intra4x4_pred_mode_flag[ 3] : 0111,0,111 ……16个 1b 88 00 3e cf. intra_chroma_pred_modeue(v) : 最后的一个1bit:0 接下来是macroblock_layer的coded_block_pattern和run level,既系数 c0 06 ad a0 18 1100 0000 0000 0110 1010 0000 0001 1000 coded_block_patternme(v):0,根据Table 9?4 470x2f mb_qp_delta(se(v):):0 len 1 residual( )见7.3.5.3 residual_block( LumaLevel[ i8x8 * 4 i4x4 ], 16 ) coeff_token(ce(v): 00 0000 0000 0110 1 nc 0(left block and top block 相关的) len: { // 0702 { 1, 6, 8, 9,10,11,13,13,13,14,14,15,15,16,16,16,16}, { 0, 2, 6, 8, 9,10,11,13,13,14,14,15,15,15,16,16,16}, { 0, 0, 3, 7, 8, 9,10,11,13,13,14,14,15,15,16,16,16}, { 0, 0, 0, 5, 6, 7, 8, 9,10,11,13,14,14,15,15,16,16}, }, { { 2, 6, 6, 7, 8, 8, 9,11,11,12,12,12,13,13,13,14,14}, { 0, 2, 5, 6, 6, 7, 8, 9,11,11,12,12,13,13,14,14,14}, { 0, 0, 3, 6, 6, 7, 8, 9,11,11,12,12,13,13,13,14,14}, { 0, 0, 0, 4, 4, 5, 6, 6, 7, 9,11,11,12,13,13,13,14}, }, { { 4, 6, 6, 6, 7, 7, 7, 7, 8, 8, 9, 9, 9,10,10,10,10}, { 0, 4, 5, 5, 5, 5, 6, 6, 7, 8, 8, 9, 9, 9,10,10,10}, { 0, 0, 4, 5, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9,10,10,10}, { 0, 0, 0, 4, 4, 4, 4, 4, 5, 6, 7, 8, 8, 9,10,10,10}, }, code: { 1, 5, 7, 7, 7, 7,15,11, 8,15,11,15,11,15,11, 7,4}, { 0, 1, 4, 6, 6, 6, 6,14,10,14,10,14,10, 1,14,10,6}, { 0, 0, 1, 5, 5, 5, 5, 5,13, 9,13, 9,13, 9,13, 9,5}, { 0, 0, 0, 3, 3, 4, 4, 4, 4, 4,12,12, 8,12, 8,12,8}, }, { { 3,11, 7, 7, 7, 4, 7,15,11,15,11, 8,15,11, 7, 9,7}, { 0, 2, 7,10, 6, 6, 6, 6,14,10,14,10,14,10,11, 8,6}, { 0, 0, 3, 9, 5, 5, 5, 5,13, 9,13, 9,13, 9, 6,10,5}, { 0, 0, 0, 5, 4, 6, 8, 4, 4, 4,12, 8,12,12, 8, 1,4}, }, { {15,15,11, 8,15,11, 9, 8,15,11,15,11, 8,13, 9, 5,1}, { 0,14,15,12,10, 8,14,10,14,14,10,14,10, 7,12, 8,4}, { 0, 0,13,14,11, 9,13, 9,13,10,13, 9,13, 9,11, 7,3}, { 0, 0, 0,12,11,10, 9, 8,13,12,12,12, 8,12,10, 6,2}, }, 根据表查的 code 13,len 15i 12j2 所以numcoeff 12,numtrailingones 2 010 0000 0001 1000: totalzeros:根据numcoeff int lentab[TOTRUN_NUM][16] { { 1,3,3,4,4,5,5,6,6,7,7,8,8,9,9,9}, { 3,3,3,3,3,4,4,4,4,5,5,6,6,6,6}, { 4,3,3,3,4,4,3,3,4,5,5,6,5,6}, { 5,3,4,4,3,3,3,4,3,4,5,5,5}, { 4,4,4,3,3,3,3,3,4,5,4,5}, { 6,5,3,3,3,3,3,3,4,3,6}, { 6,5,3,3,3,2,3,4,3,6}, { 6,4,5,3,2,2,3,3,6}, { 6,6,4,2,2,3,2,5}, { 5,5,3,2,2,2,4}, { 4,4,3,3,1,3}, { 4,4,2,1,3}, numcoeff开始 { 3,3,1,2}, { 2,2,1}, { 1,1}, }; int codtab[TOTRUN_NUM][16] { {1,3,2,3,2,3,2,3,2,3,2,3,2,3,2,1}, {7,6,5,4,3,5,4,3,2,3,2,3,2,1,0}, {5,7,6,5,4,3,4,3,2,3,2,1,1,0}, {3,7,5,4,6,5,4,3,3,2,2,1,0}, {5,4,3,7,6,5,4,3,2,1,1,0}, {1,1,7,6,5,4,3,2,1,1,0}, {1,1,5,4,3,3,2,1,1,0}, {1,1,1,3,3,2,2,1,0}, {1,0,1,3,2,1,1,1,}, {1,0,1,3,2,1,1,}, {0,1,1,2,1,3}, {0,1,1,1,1}, numcoeff开始 {0,1,1,1}, {0,1,1}, {0,1}, }; Code 1,len 2,i2,j 0, totzeros 2 Read run: 0 0000 0001 1000根据totzeros 2 int lentab[TOTRUN_NUM][16] { {1,1}, {1,2,2}, {2,2,2,2}, {2,2,2,3,3}, {2,2,3,3,3,3}, {2,3,3,3,3,3,3}, {3,3,3,3,3,3,3,4,5,6,7,8,9,10,11}, }; int codtab[TOTRUN_NUM][16] { {1,0}, {1,1,0}, {3,2,1,0}, {3,2,1,1,0}, {3,2,3,2,1,0}, {3,0,1,3,2,5,4}, {7,6,5,4,3,2,1,1,1,1,1,1,1,1,1}, Code 1,len 1,I 0,j 0 0.1.1 Slice data syntax slice_data( ) { C Descriptor if( entropy_coding_mode_flag ) while( !byte_aligned( ) ) cabac_alignment_one_bit 2 f(1) CurrMbAddr first_mb_in_slice * ( 1 MbaffFrameFlag ) moreDataFlag 1 prevMbSkipped 0 do { if( slice_type ! I slice_type ! SI ) if( !entropy_coding_mode_flag ) { mb_skip_run 2 ue(v) prevMbSkipped ( mb_skip_run 0 ) for( i0; imb_skip_run; i ) CurrMbAddr NextMbAddress( CurrMbAddr ) moreDataFlag more_rbsp_data( ) } else { mb_skip_flag 2 ae(v) moreDataFlag !mb_skip_flag } if( moreDataFlag ) { if( MbaffFrameFlag ( CurrMbAddr % 2 0 | | ( CurrMbAddr % 2 1 prevMbSkipped ) ) ) mb_field_decoding_flag 2 u(1) | ae(v) macroblock_layer( ) 2 | 3 | 4 } if( !entropy_coding_mode_flag ) moreDataFlag more_rbsp_data( ) else { if( slice_type ! I slice_type ! SI ) prevMbSkipped mb_skip_flag if( MbaffFrameFlag CurrMbAddr % 2 0 ) moreDataFlag 1 else { end_of_slice_flag 2 ae(v) moreDataFlag !end_of_slice_flag } } CurrMbAddr NextMbAddress( CurrMbAddr ) } while( moreDataFlag ) } se(v) : CABAC正式介绍。根据Table 9 5 – coeff_token mapping to TotalCoeff( coeff_token ) and TrailingOnes( coeff_token )。 chroma_format_idc 无 Bit string form Range of codeNum 1 0 0 1 x0 1-2 0 0 1 x1 x0 3-6 0 0 0 1 x2 x1 x0 7-14 0 0 0 0 1 x3 x2 x1 x0 15-30 0 0 0 0 0 1 x4 x3 x2 x1 x0 31-62 … … 0.1.1.1 Slice layer without partitioning RBSP syntax slice_layer_without_partitioning_rbsp( ) { C Descriptor slice_header( ) 2 slice_data( ) /* all categories of slice_data( ) syntax */ 2 | 3 | 4 rbsp_slice_trailing_bits( ) 2 } 0.1.1.2 Sequence parameter set RBSP syntax seq_parameter_set_rbsp( ) { C Descriptor profile_idc 0 u(8) constraint_set0_flag 0 u(1) constraint_set1_flag 0 u(1) constraint_set2_flag 0 u(1) constraint_set3_flag 0 u(1) reserved_zero_4bits /* equal to 0 */ 0 u(4) level_idc 0 u(8) seq_parameter_set_id 0 ue(v) if( profile_idc 100 | | profile_idc 110 | | profile_idc 122 | | profile_idc 144 ) { chroma_format_idc 0 ue(v) if( chroma_format_idc 3 ) residual_colour_transform_flag 0 u(1) bit_depth_luma_minus8 0 ue(v) bit_depth_chroma_minus8 0 ue(v) qpprime_y_zero_transform_bypass_flag 0 u(1) seq_scaling_matrix_present_flag 0 u(1) if( seq_scaling_matrix_present_flag ) for( i 0; i 8; i ) { seq_scaling_list_present_flag[ i ] 0 u(1) if( seq_scaling_list_present_flag[ i ] ) if( i 6 ) scaling_list( ScalingList4x4[ i ], 16, UseDefaultScalingMatrix4x4Flag[ i ]) 0 else scaling_list( ScalingList8x8[ i – 6 ], 64, UseDefaultScalingMatrix8x8Flag[ i – 6 ] ) 0 } } log2_max_frame_num_minus4 0 ue(v) pic_order_cnt_type 0 ue(v) if( pic_order_cnt_type 0 ) log2_max_pic_order_cnt_lsb_minus4 0 ue(v) else if( pic_order_cnt_type 1 ) { delta_pic_order_always_zero_flag 0 u(1) offset_for_non_ref_pic 0 se(v) offset_for_top_to_bottom_field 0 se(v) num_ref_frames_in_pic_order_cnt_cycle 0 ue(v) for( i 0; i num_ref_frames_in_pic_order_cnt_cycle; i ) offset_for_ref_frame[ i ] 0 se(v) } num_ref_frames 0 ue(v) gaps_in_frame_num_value_allowed_flag 0 u(1) pic_width_in_mbs_minus1 0 ue(v) pic_height_in_map_units_minus1 0 ue(v) frame_mbs_only_flag 0 u(1) if( !frame_mbs_only_flag ) mb_adaptive_frame_field_flag 0 u(1) direct_8x8_inference_flag 0 u(1) frame_cropping_flag 0 u(1) if( frame_cropping_flag ) { frame_crop_left_offset 0 ue(v) frame_crop_right_offset 0 ue(v) frame_crop_top_offset 0 ue(v) frame_crop_bottom_offset 0 ue(v) } vui_parameters_present_flag 0 u(1) if( vui_parameters_present_flag ) vui_parameters( ) 0 rbsp_trailing_bits( ) 0 } Table 7?1 – NAL unit type codes nal_unit_type Content of NAL unit and RBSP syntax structure C 0 Unspecified 1 Coded slice of a non-IDR pictureslice_layer_without_partitioning_rbsp( ) 2, 3, 4 2 Coded slice data partition A slice_data_partition_a_layer_rbsp( ) 2 3 Coded slice data partition B slice_data_partition_b_layer_rbsp( ) 3 4 Coded slice data partition C slice_data_partition_c_layer_rbsp( ) 4 5 Coded slice of an IDR pictureslice_layer_without_partitioning_rbsp( ) 2, 3 6 Supplemental enhancement information (SEI)sei_rbsp( ) 5 7 Sequence parameter setseq_parameter_set_rbsp( ) 0 8 Picture parameter setpic_parameter_set_rbsp( ) 1 9 Access unit delimiteraccess_unit_delimiter_rbsp( ) 6 10 End of sequenceend_of_seq_rbsp( ) 7 11 End of streamend_of_stream_rbsp( ) 8 12 Filler datafiller_data_rbsp( ) 9 13 Sequence parameter set extensionseq_parameter_set_extension_rbsp( ) 10 14..18 Reserved 19 Coded slice of an auxiliary coded picture without partitioningslice_layer_without_partitioning_rbsp( ) 2, 3, 4 20..23 Reserved 24..31 Unspecified byte_stream_nal_unit( NumBytesInNALunit ) { C Descriptor while( next_bits( 24 ) ! 0x000001 next_bits( 32 ) ! 0x00000001 ) leading_zero_8bits /* equal to 0x00 */ f(8) if( next_bits( 24 ) ! 0x000001 ) zero_byte /* equal to 0x00 */ f(8) start_code_prefix_one_3bytes /* equal to 0x000001 */ f(24) nal_unit( NumBytesInNALunit ) while( more_data_in_byte_stream( ) next_bits( 24 ) ! 0x000001 next_bits( 32 ) ! 0x00000001 ) trailing_zero_8bits /* equal to 0x00 */ f(8) } 0.1.1.3 Picture parameter set RBSP syntax pic_parameter_set_rbsp( ) { C Descriptor pic_parameter_set_id 1 ue(v) seq_parameter_set_id 1 ue(v) entropy_coding_mode_flag 1 u(1) pic_order_present_flag 1 u(1) num_slice_groups_minus1 1 ue(v) if( num_slice_groups_minus1 0 ) { slice_group_map_type 1 ue(v) if( slice_group_map_type 0 ) for( iGroup 0; iGroup num_slice_groups_minus1; iGroup ) run_length_minus1[ iGroup ] 1 ue(v) else if( slice_group_map_type 2 ) for( iGroup 0; iGroup num_slice_groups_minus1; iGroup ) { top_left[ iGroup ] 1 ue(v) bottom_right[ iGroup ] 1 ue(v) } else if( slice_group_map_type 3 | | slice_group_map_type 4 | | slice_group_map_type 5 ) { slice_group_change_direction_flag 1 u(1) slice_group_change_rate_minus1 1 ue(v) } else if( slice_group_map_type 6 ) { pic_size_in_map_units_minus1 1 ue(v) for( i 0; i pic_size_in_map_units_minus1; i ) slice_group_id[ i ] 1 u(v) } } num_ref_idx_l0_active_minus1 1 ue(v) num_ref_idx_l1_active_minus1 1 ue(v) weighted_pred_flag 1 u(1) weighted_bipred_idc 1 u(2) pic_init_qp_minus26 /* relative to 26 */ 1 se(v) pic_init_qs_minus26 /* relative to 26 */ 1 se(v) chroma_qp_index_offset 1 se(v) deblocking_filter_control_present_flag 1 u(1) constrained_intra_pred_flag 1 u(1) redundant_pic_cnt_present_flag 1 u(1) if( more_rbsp_data( ) ) { transform_8x8_mode_flag 1 u(1) pic_scaling_matrix_present_flag 1 u(1) if( pic_scaling_matrix_present_flag ) for( i 0; i 6 2* transform_8x8_mode_flag; i ) { pic_scaling_list_present_flag[ i ] 1 u(1) if( pic_scaling_list_present_flag[ i ] ) if( i 6 ) scaling_list( ScalingList4x4[ i ], 16, UseDefaultScalingMatrix4x4Flag[ i ] ) 1 else scaling_list( ScalingList8x8[ i – 6 ], 64, UseDefaultScalingMatrix8x8Flag[ i – 6 ] ) 1 } second_chroma_qp_index_offset 1 se(v) } rbsp_trailing_bits( ) 1 } 0.1.2 Slice header syntax slice_header( ) { C Descriptor first_mb_in_slice 2 ue(v) slice_type 2 ue(v) pic_parameter_set_id 2 ue(v) frame_num 2 u(v) if( !frame_mbs_only_flag ) { field_pic_flag 2 u(1) if( field_pic_flag ) bottom_field_flag 2 u(1) } if( nal_unit_type 5 ) idr_pic_id 2 ue(v) if( pic_order_cnt_type 0 ) { pic_order_cnt_lsb 2 u(v) if( pic_order_present_flag !field_pic_flag ) delta_pic_order_cnt_bottom 2 se(v) } if( pic_order_cnt_type 1 !delta_pic_order_always_zero_flag ) { delta_pic_order_cnt[ 0 ] 2 se(v) if( pic_order_present_flag !field_pic_flag ) delta_pic_order_cnt[ 1 ] 2 se(v) } if( redundant_pic_cnt_present_flag ) redundant_pic_cnt 2 ue(v) if( slice_type B ) direct_spatial_mv_pred_flag 2 u(1) if( slice_type P | | slice_type SP | | slice_type B ) { num_ref_idx_active_override_flag 2 u(1) if( num_ref_idx_active_override_flag ) { num_ref_idx_l0_active_minus1 2 ue(v) if( slice_type B ) num_ref_idx_l1_active_minus1 2 ue(v) } } ref_pic_list_reordering( ) 2 if( ( weighted_pred_flag ( slice_type P | | slice_type SP ) ) | | ( weighted_bipred_idc 1 slice_type B ) ) pred_weight_table( ) 2 if( nal_ref_idc ! 0 ) dec_ref_pic_marking( ) 2 if( entropy_coding_mode_flag slice_type ! I slice_type ! SI ) cabac_init_idc 2 ue(v) slice_qp_delta 2 se(v) if( slice_type SP | | slice_type SI ) { if( slice_type SP ) sp_for_switch_flag 2 u(1) slice_qs_delta 2 se(v) } if( deblocking_filter_control_present_flag ) { disable_deblocking_filter_idc 2 ue(v) if( disable_deblocking_filter_idc ! 1 ) { slice_alpha_c0_offset_div2 2 se(v) slice_beta_offset_div2 2 se(v) } } if( num_slice_groups_minus1 0 slice_group_map_type 3 slice_group_map_type 5) slice_group_change_cycle 2 u(v) } 0.1.3 Slice data syntax slice_data( ) { C Descriptor if( entropy_coding_mode_flag ) while( !byte_aligned( ) ) cabac_alignment_one_bit 2 f(1) CurrMbAddr first_mb_in_slice * ( 1 MbaffFrameFlag ) moreDataFlag 1 prevMbSkipped 0 do { if( slice_type ! I slice_type ! SI ) if( !entropy_coding_mode_flag ) { mb_skip_run 2 ue(v) prevMbSkipped ( mb_skip_run 0 ) for( i0; imb_skip_run; i ) CurrMbAddr NextMbAddress( CurrMbAddr ) moreDataFlag more_rbsp_data( ) } else { mb_skip_flag 2 ae(v) moreDataFlag !mb_skip_flag } if( moreDataFlag ) { if( MbaffFrameFlag ( CurrMbAddr % 2 0 | | ( CurrMbAddr % 2 1 prevMbSkipped ) ) ) mb_field_decoding_flag 2 u(1) | ae(v) macroblock_layer( ) 2 | 3 | 4 } if( !entropy_coding_mode_flag ) moreDataFlag more_rbsp_data( ) else { if( slice_type ! I slice_type ! SI ) prevMbSkipped mb_skip_flag if( MbaffFrameFlag CurrMbAddr % 2 0 ) moreDataFlag 1 else { end_of_slice_flag 2 ae(v) moreDataFlag !end_of_slice_flag } } CurrMbAddr NextMbAddress( CurrMbAddr ) } while( moreDataFlag ) } The variable MbaffFrameFlag is derived as follows. MbaffFrameFlag ( mb_adaptive_frame_field_flag !field_pic_flag ) (7-22) 0.1.4 Macroblock layer syntax macroblock_layer( ) { C Descriptor mb_type 2 ue(v) | ae(v) if( mb_type I_PCM ) { while( !byte_aligned( ) ) pcm_alignment_zero_bit 2 f(1) for( i 0; i 256; i ) pcm_sample_luma[ i ] 2 u(v) for( i 0; i 2 * MbWidthC * MbHeightC; i ) pcm_sample_chroma[ i ] 2 u(v) } else { noSubMbPartSizeLessThan8x8Flag 1 if( mb_type ! I_NxN MbPartPredMode( mb_type, 0 ) ! Intra_16x16 NumMbPart( mb_type ) 4 ) { sub_mb_pred( mb_type ) 2 for( mbPartIdx 0; mbPartIdx 4; mbPartIdx ) if( sub_mb_type[ mbPartIdx ] ! B_Direct_8x8 ) { if( NumSubMbPart( sub_mb_type[ mbPartIdx ] ) 1 ) noSubMbPartSizeLessThan8x8Flag 0 } else if( !direct_8x8_inference_flag ) noSubMbPartSizeLessThan8x8Flag 0 } else { if( transform_8x8_mode_flag mb_type I_NxN ) transform_size_8x8_flag 2 u(1) | ae(v) mb_pred( mb_type ) 2 } if( MbPartPredMode( mb_type, 0 ) ! Intra_16x16 ) { coded_block_pattern 2 me(v) | ae(v) if( CodedBlockPatternLuma 0 transform_8x8_mode_flag mb_type ! I_NxN noSubMbPartSizeLessThan8x8Flag ( mb_type ! B_Direct_16x16 | | direct_8x8_inference_flag ) ) transform_size_8x8_flag 2 u(1) | ae(v) } if( CodedBlockPatternLuma 0 | | CodedBlockPatternChroma 0 | | MbPartPredMode( mb_type, 0 ) Intra_16x16 ) { mb_qp_delta 2 se(v) | ae(v) residual( ) 3 | 4 } } } 0.1.4.1 Macroblock prediction syntax mb_pred( mb_type ) { C Descriptor if( MbPartPredMode( mb_type, 0 ) Intra_4x4 | | MbPartPredMode( mb_type, 0 ) Intra_8x8 | | MbPartPredMode( mb_type, 0 ) Intra_16x16 ) { if( MbPartPredMode( mb_type, 0 ) Intra_4x4 ) for( luma4x4BlkIdx0; luma4x4BlkIdx16; luma4x4BlkIdx ) { prev_intra4x4_pred_mode_flag[ luma4x4BlkIdx ] 2 u(1) | ae(v) if( !prev_intra4x4_pred_mode_flag[ luma4x4BlkIdx ] ) rem_intra4x4_pred_mode[ luma4x4BlkIdx ] 2 u(3) | ae(v) } if( MbPartPredMode( mb_type, 0 ) Intra_8x8 ) for( luma8x8BlkIdx0; luma8x8BlkIdx4; luma8x8BlkIdx ) { prev_intra8x8_pred_mode_flag[ luma8x8BlkIdx ] 2 u(1) | ae(v) if( !prev_intra8x8_pred_mode_flag[ luma8x8BlkIdx ] ) rem_intra8x8_pred_mode[ luma8x8BlkIdx ] 2 u(3) | ae(v) } if( chroma_format_idc ! 0 ) intra_chroma_pred_mode 2 ue(v) | ae(v) } else if( MbPartPredMode( mb_type, 0 ) ! Direct ) { for( mbPartIdx 0; mbPartIdx NumMbPart( mb_type ); mbPartIdx) if( ( num_ref_idx_l0_active_minus1 0 | | mb_field_decoding_flag ) MbPartPredMode( mb_type, mbPartIdx ) ! Pred_L1 ) ref_idx_l0[ mbPartIdx ] 2 te(v) | ae(v) for( mbPartIdx 0; mbPartIdx NumMbPart( mb_type ); mbPartIdx) if( ( num_ref_idx_l1_active_minus1 0 | | mb_field_decoding_flag ) MbPartPredMode( mb_type, mbPartIdx ) ! Pred_L0 ) ref_idx_l1[ mbPartIdx ] 2 te(v) | ae(v) for( mbPartIdx 0; mbPartIdx NumMbPart( mb_type ); mbPartIdx) if( MbPartPredMode ( mb_type, mbPartIdx ) ! Pred_L1 ) for( compIdx 0; compIdx 2; compIdx ) mvd_l0[ mbPartIdx ][ 0 ][ compIdx ] 2 se(v) | ae(v) for( mbPartIdx 0; mbPartIdx NumMbPart( mb_type ); mbPartIdx) if( MbPartPredMode( mb_type, mbPartIdx ) ! Pred_L0 ) for( compIdx 0; compIdx 2; compIdx ) mvd_l1[ mbPartIdx ][ 0 ][ compIdx ] 2 se(v) | ae(v) } } 0.1.4.2 Residual data syntax residual( ) { C Descriptor if( !entropy_coding_mode_flag ) residual_block residual_block_cavlc else residual_block residual_block_cabac if( MbPartPredMode( mb_type, 0 ) Intra_16x16 ) residual_block( Intra16x16DCLevel, 16 ) 3 for( i8x8 0; i8x8 4; i8x8 ) /* each luma 8x8 block */ if( !transform_size_8x8_flag | | !entropy_coding_mode_flag ) for( i4x4 0; i4x4 4; i4x4 ) { /* each 4x4 sub-block of block */ if( CodedBlockPatternLuma ( 1 i8x8 ) ) if( MbPartPredMode( mb_type, 0 ) Intra_16x16 ) residual_block( Intra16x16ACLevel[ i8x8 * 4 i4x4 ], 15 ) 3 else residual_block( LumaLevel[ i8x8 * 4 i4x4 ], 16 ) 3 | 4 else if( MbPartPredMode( mb_type, 0 ) Intra_16x16 ) for( i 0; i 15; i ) Intra16x16ACLevel[ i8x8 * 4 i4x4 ][ i ] 0 else for( i 0; i 16; i ) LumaLevel[ i8x8 * 4 i4x4 ][ i ] 0 if( !entropy_coding_mode_flag transform_size_8x8_flag ) for( i 0; i 16; i ) LumaLevel8x8[ i8x8 ][ 4 * i i4x4 ] LumaLevel[ i8x8 * 4 i4x4 ][ i ] } else if( CodedBlockPatternLuma ( 1 i8x8 ) ) residual_block( LumaLevel8x8[ i8x8 ], 64 ) 3 | 4 else for( i 0; i 64; i ) LumaLevel8x8[ i8x8 ][ i ] 0 if( chroma_format_idc ! 0 ) { NumC8x8 4 / ( SubWidthC * SubHeightC ) for( iCbCr 0; iCbCr 2; iCbCr ) if( CodedBlockPatternChroma 3 ) /* chroma DC residual present */ residual_block( ChromaDCLevel[ iCbCr ], 4 * NumC8x8 ) 3 | 4 else for( i 0; i 4 * NumC8x8; i ) ChromaDCLevel[ iCbCr ][ i ] 0 for( iCbCr 0; iCbCr 2; iCbCr ) for( i8x8 0; i8x8 NumC8x8; i8x8 ) for( i4x4 0; i4x4 4; i4x4 ) if( CodedBlockPatternChroma 2 ) /* chroma AC residual present */ residual_block( ChromaACLevel[ iCbCr ][ i8x8*4i4x4 ], 15) 3 | 4 else for( i 0; i 15; i ) ChromaACLevel[ iCbCr ][ i8x8*4i4x4 ][ i ] 0 } residual_block_cavlc( coeffLevel, maxNumCoeff ) { C Descriptor for( i 0; i maxNumCoeff; i ) coeffLevel[ i ] 0 coeff_token 3 | 4 ce(v) if( TotalCoeff( coeff_token ) 0 ) { if( TotalCoeff( coeff_token ) 10 TrailingOnes( coeff_token ) 3 ) suffixLength 1 else suffixLength 0 for( i 0; i TotalCoeff( coeff_token ); i ) if( i TrailingOnes( coeff_token ) ) { trailing_ones_sign_flag 3 | 4 u(1) level[ i ] 1 – 2 * trailing_ones_sign_flag } else { level_prefix 3 | 4 ce(v) levelCode ( Min( 15, level_prefix ) suffixLength ) if( suffixLength 0 | | level_prefix 14 ) { level_suffix 3 | 4 u(v) levelCode level_suffix } if( level_prefix 15 suffixLength 0 ) levelCode 15 if( level_prefix 16 ) levelCode ( 1 ( level_prefix – 3 ) ) – 4096 if( i TrailingOnes( coeff_token ) TrailingOnes( coeff_token ) 3 ) levelCode 2 if( levelCode % 2 0 ) level[ i ] ( levelCode 2 ) 1 else level[ i ] ( –levelCode – 1 ) 1 if( suffixLength 0 ) suffixLength 1 if( Abs( level[ i ] ) ( 3 ( suffixLength – 1 ) ) suffixLength 6 ) suffixLength } if( TotalCoeff( coeff_token ) maxNumCoeff ) { total_zeros 3 | 4 ce(v) zerosLeft total_zeros } else zerosLeft 0 for( i 0; i TotalCoeff( coeff_token ) – 1; i ) { if( zerosLeft 0 ) { run_before 3 | 4 ce(v) run[ i ] run_before } else run[ i ] 0 zerosLeft zerosLeft – run[ i ] } run[ TotalCoeff( coeff_token ) – 1 ] zerosLeft coeffNum ?1 for( i TotalCoeff( coeff_token ) – 1; i 0; i-- ) { coeffNum run[ i ] 1 coeffLevel[ coeffNum ] level[ i ] } } }
