Sorenson H.263 Bitstream Format

H263VIDEOPACKET

フィールドコメント
PictureStartCodeUB[17]Similar to H.263 5.1.1
0000 0000 0000 0000 1
VersionUB[5]Video format version
Flash Player 6 supports 0 and 1
TemporalReferenceUB[8]See H.263 5.1.2
PictureSizeUB[3]000: custom, 1 byte
001: custom, 2 bytes
010: CIF (352x288)
011: QCIF (176x144)
100: SQCIF (128x96)
101: 320x240
110: 160x120
111: reserved
CustomWidthIf PictureSize = 000, UB[8]
If PictureSize = 001, UB[16]
Otherwise absent
Note: UB[16] is not the same
as UI16; there is no byte
swapping.
Width in pixels
CustomHeightIf PictureSize = 000, UB[8]
If PictureSize = 001, UB[16]
Otherwise absent
Note: UB[16] is not the same
as UI16; there is no byte
swapping.
Height in pixels
PictureTypeUB[2]00: intra frame
01: inter frame
10: disposable inter frame
11: reserved
DeblockingFlagUB[1]Requests use of deblocking
filter (advisory only, Flash
Player may ignore)
QuantizerUB[5]See H.263 5.1.4
ExtraInformationFlagUB[1]See H.263 5.1.9
ExtraInformationIf ExtraInformationFlag = 1,
UB[8]
Otherwise absent
See H.263 5.1.10
...The ExtraInformationFlag-
ExtraInformation sequence
repeats until an
ExtraInformationFlag of 0 is
encountered
MacroblockMACROBLOCKSee following
PictureStuffingvariesSee H.263 5.1.13

Macro block

MACROBLOCK

フィールドコメント
CodedMacroblockFlagUB[1]See H.263 5.3.1
If 1, macro block ends here
MacroblockTypevariesSee H.263 5.3.2
Can cause various fields (see
following) to be absent
BlockPatternvariesSee H.263 5.3.5
QuantizerInformationUB[2]See H.263 5.3.6
00: -1
01: -2
10: +1
11: +2
MotionVectorDatavaries[2]See H.263 5.3.7
A horizontal code followed by a
vertical code
ExtraMotionVectorDatavaries[6]See H.263 5.3.8
Three more MotionVectorData
code pairs are included when
MacroblockType is INTER4V
BlockDataBLOCKDATA[6]See H.263 5.4
Four luminance blocks followed
by two chrominance blocks

Block data

7-bit LEVELs11-bit LEVELs
IndexLevelCodeIndexLevelCode
--64FORBIDDEN--1024FORBIDDEN
0-631000 0010-10231000 0000
001
......
61-21111 1101021-21111 1111 110
62-11111 1111022-11111 1111 111
-0FORBIDDEN-0FORBIDDEN
6310000 001102310000 0000
001
6420000 010102420000 0000
010
......
125630111 111204510230111 1111 111

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Last-modified: 2013-10-27 (日) 17:36:51 (2034d)