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分析一段H264视频数据

發(fā)布時(shí)間：2023/12/18 编程问答 25 豆豆

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分析一段H264視頻數(shù)據(jù)

Posted on 2007-05-31 09:42 vcommon 閱讀(1968) 評論(8) ?編輯?收藏引用

分析

00 00 00 01 67 42 00 1E 99 A0 B1 31 00 00 00 01

H264的數(shù)據(jù)流分為兩種，一種是NAL UNIT stream(RTP),一種是 bits stream,

兩者可以互相轉(zhuǎn)換。我們分析的這個(gè)是 bit stream,根據(jù)Annex B

00 00 00 01 67 42 00 1E 99 A0 B1 31 是一個(gè)NAL，在兩個(gè)00 00 00 01之間

0110 0111 0100 0010 0000 0000 0001 1110 1001 1001 1010 0000 1011 0001 0011 0001

forbidden_zero_bit（1） ＝ 0

nal_ref_idc（2）＝ 11

nal_unit_type（5） ＝ 0 0111：seq_parameter_set_rbsp(?)

所以 processSPS

profile_idc(8):42：0100 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：根據(jù)Table9.1 ， value= 0,只占1bit.

根據(jù)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

根據(jù)pic_order_cnt_type忽略幾個(gè)參數(shù)

num_ref_frames（ue）：010,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_flag（1）:0

忽略

vui_parameters_present_flag(1):0

忽略

NALU結(jié)束

68 CE 38 80 00 00 00 01

0110 1000

forbidden_zero_bit（1） ＝ 0

nal_ref_idc（2）＝ 11

nal_unit_type（5） ＝01000：pic_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 表示編碼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_minus1（ue）: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結(jié)束

65 88 80 21 71 27 1B 88…….3888*16 byte

65：0110 0101

forbidden_zero_bit（1） ＝ 0

nal_ref_idc（2）＝ 11

nal_unit_type（5）＝0 0101：slice_layer_without_partitioning_rbsp(?),IDR湞

Slice

Slice_Header:

first_mb_in_slice(ue):0

slice_type(ue):000 1000 = 7

pic_parameter_set_id(ue) = 0

80 21：000 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(?) 見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_flag（1）：0

long_term_reference_flag（1）：0

忽略

。。71 27

001 0111 0001 0010 0111

slice_qp_delta（se（v）：001 01 ，4：-2

忽略

slice_data( ):7.3.4

對I-Slice:忽略N多

進(jìn)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_type（ue（v）：0

mb_pred( mb_type )

prev_intra4x4_pred_mode_flag[?luma4x4BlkIdx?] （1bit, 對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個(gè)

1b 88 00 3e cf.

intra_chroma_pred_mode（ue(v)）?: 最后的一個(gè)1bit:0

接下來是macroblock_layer的coded_block_pattern和run level,既系數(shù)

c0 06 ad a0 18

1100 0000 0000 0110 1010 0000 0001 1000

coded_block_pattern（me(v):0,根據(jù)Table?9?4，= 47，0x2f

mb_qp_delta(se(v):):0 len =1

residual(?)見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 相關(guān)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},

??? },

根據(jù)表查的：

code = 13,len = 15，i= 12，j=2

?????? 所以numcoeff = 12,numtrailingones = 2

010 0000 0001 1000: totalzeros:根據(jù)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開始

??? { 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開始

??? {0,1,1,1},

??? {0,1,1},

??? {0,1},?

?};

Code = 1,len = 2,i=2,j = 0, totzeros = 2

Read run: 0 0000 0001 1000根據(jù)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( i="0"; i<mb_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正式介紹。根據(jù)Table 9 5 – coeff_token mapping to TotalCoeff( coeff_token ) and TrailingOnes( coeff_token )。

chroma_format_idc 無

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 picture slice_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 picture slice_layer_without_partitioning_rbsp(?)	2, 3
6	Supplemental enhancement information (SEI) sei_rbsp(?)	5
7	Sequence parameter set seq_parameter_set_rbsp(?)	0
8	Picture parameter set pic_parameter_set_rbsp(?)	1
9	Access unit delimiter access_unit_delimiter_rbsp(?)	6
10	End of sequence end_of_seq_rbsp( )	7
11	End of stream end_of_stream_rbsp( )	8
12	Filler data filler_data_rbsp(?)	9
13	Sequence parameter set extension seq_parameter_set_extension_rbsp(?)	10
14..18	Reserved	?
19	Coded slice of an auxiliary coded picture without partitioning slice_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( i="0"; i<mb_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( luma4x4BlkIdx=0; luma4x4BlkIdx<16; 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( luma8x8BlkIdx=0; luma8x8BlkIdx<4; 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*4+i4x4?], 15)	3 \| 4	?
?????????????????????? else	?	?
?????????????????????????? for( i = 0; i < 15; i++ )	?	?
??????????????????????????????? ChromaACLevel[?iCbCr?][?i8x8*4+i4x4?][?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 ]	?	?
?????? }	?	?
??? }	?	?
}

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