MPEG1/MPEG2 Sequence Extension Data Header (0x000001B5)

BYTE0								BYTE1								BYTE2								BYTE3
0x00								0x00								0x01								0xB5
0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1	1	0	1	1	0	1	0	1

　Sequence extension dataヘッダのスタートコードは0x000001B5。
　サイズはエクステンションのタイプによる。

Sequence Extension (0001)
BYTE4								BYTE5								BYTE6								BYTE7								BYTE8								BYTE9
0001				LLLL				LLLL				P	CC		H	H	VV		RRRRR					RRRRRRR							1	BBBBBBBB								D	NN		FFFFF

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0001 : 識別コード

LLLLLLLL(8bits) : profile and level

P : progressive sequence

CC(2bits) : chroma format

HH(2bits) : horizontal size extension

VV(2bits) : vertical size extension

RRR...(12bits) : bit rate extension

1 : marker bit(always set 1)

BBBBBBBB(8bits) : vbv buffer size extension

D : low delay

NN(2bits) : frame rate extension n

FFFFF(5bits) : frame rate extension d

Sequence Display Extension (0010)
BYTE4								BYTE5								BYTE6								BYTE7								BYTE8								BYTE9								BYTE10								BYTE11
0010				FFF			0	HHHHHHHH								HHHHHH						1	V	VVVVVVVV								VVVVV					000
							1	PPPPPPPP								CCCCCCCC								MMMMMMMM								HHHHHHHH								HHHHHH						1	V	VVVVVVVV								VVVVV					000

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0010 : 識別コード

FFF(3bits) : video format

0 or 1 : color description flag

PPPPPPPP(8bits) : color primaries

CCCCCCCC(8bits) : transfer characteristics

MMMMMMMM(8bits) : matrix coefficients

HHH...(14bits) : display horizontal size

1 : marker bit(always set 1)

VVV...(14bits) : display vertical size

Quant Matrix Extension (0011)
BYTE4								BYTE5								BYTE6
0011				F

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0011 : 識別コード

F : load_intra_quantiser_matrix (0:end, 1:add matrix 64bits and next 'load_non_intra(or chroma or non_chroma)_quantiser_matrix')

Sequence Scalable Extension (0101)
BYTE4								BYTE5								BYTE6								BYTE7								BYTE8								BYTE9								BYTE10								BYTE11
0101				x0		II		II		000000
				01						HHHHHH						HHHHHHHH								1	VVVVVVV							VVVVVVV							M	MMMM				NNNN				N	mmmmm					nn		nnn			00000
				11						0	00000
										1	G	OOO			F	FF		000000

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0101 : 識別コード

xx(2bits) : scalable mode (00:data partitioning, 01:spatial scalability, 10:SNR scalability, 11:temporal scalability)

IIII(4bits) : Layer ID

HHH...(14bits) : lower layer prediction horizontal size

1 : marker bit(always set 1)

VVV...(14bits) : lower layer prediction vertical size

MMMMM(5bits) : horizontal subsampling factor m

NNNNN(5bits) : horizontal subsampling factor n

mmmmm(5bits) : vertical subsampling factor m

nnnnn(5bits) : vertical subsampling factor n

0 or 1 : picture mux enable

G : mux to progressive sequence

OOO(3bits) : picture mux order

FFF(3bits) : picture mux factor

Picture Display Extension (0111)
BYTE4								BYTE5								BYTE6								BYTE7								BYTE8								BYTE9
0111				(HHHH				HHHHHHHH								HHHH				1	VVV			VVVVVVVV								VVVVV					1)	<-		-- N times repeat

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0111 : 識別コード

HHH...(16bits) : frame centre horizontal offset

1 : marker bit(always set 1)

VVV...(16bits) : frame centre vertical offset

1 : marker bit(always set 1)

N : number of frame centre offsets 2 3 1 2 3 0001 P : progressive sequence 0 1 1000 PP : picture structure 00 or 11 01 or 10 - R : repeat first field 0 1 - 0 1 T : top field first - 0 1

Picture Coding Extension (1000)
BYTE4								BYTE5								BYTE6								BYTE7								BYTE8								BYTE9								BYTE10
1000				HHHH				VVVV				hhhh				vvvv				II		PP		T	D	M	Q	F	S	R	C	G	0	000000
																																	1	A	EEE			U	L	LLLLLL						BB		BBBBBB						00

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1000 : 識別コード

HHHH(4bits) : f_code[0][0] (forward horizontal)

VVVV(4bits) : f_code[0][1] (forward vertical)

hhhh(4bits) : f_code[1][0] (backward horizontal)

vvvv(4bits) : f_code[1][1] (backward vertical)

II(2bits) : intra DC precision

PP(2bits) : picture structure

T : Top Field First

D : frame pred frame dct

M : concealment motion vectors

Q : q scale type

F : intra vlc format

S : alternate scan

R : Repeat First Field

C : chroma 420 type

G : progressive frame

0 or 1 : composite display

A : v axis

EEE(3bits) : field sequence

U : sub carrier

LLLLLLL(7bits) : burst amplitude

BBBBBBBB(8bits) : sub carrier phase

Picture Spatial Scalable Extension (1001)
BYTE4								BYTE5								BYTE6								BYTE7								BYTE8								BYTE9								BYTE10
1001				TTTT				TTTTTT						1	H	HHHHHHHH								HHHHHH						1	V	VVVVVVVV								VVVVVV						WW		G	D	000000

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1001 : 識別コード

TTT...(10bits) : lower layer temporal reference

1 : marker bit(always set 1)

HHH...(15bits) : lower layer horizontal offset

1 : marker bit(always set 1)

VVV...(15bits) : lower layer vertical offset

WW(2bits) : spatial temporal weight code table index

G : lower layer progressive frame

D : lower layer deinterlaced field select

Picture Temporal Scalable Extension (1010)
BYTE4								BYTE5								BYTE6								BYTE7
1010				SS		TT		TTTTTTTT								1	BBBBBBB							BBB			00000

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1010 : 識別コード

SS(2bits) : reference select code

TTT...(10bits) : forward temporal reference

1 : marker bit(always set 1)

BBB...(10bits) : backward temporal reference