參數(shù)資料
型號： H.261
廠商： Electronic Theatre Controls, Inc.
英文描述： LINE TRANSMISSION OF NON-TELEPHONE SIGNALS
中文描述： 線傳輸非電話信號
文件頁數(shù)： 17/31頁
文件大?。?/td> 123K
代理商： H.261
14
Recommendation H.261 (03/93)
TABLE 3/H.261
VLC table for MVD
4.2.4
Block layer
A macroblock comprises four luminance blocks and one of each of the two colour difference blocks (see Figure 10).
Data for a block consists of codewords for transform coefficients followed by an end of block marker (see Figure 11). The
order of block transmission is as in Figure 10.
4.2.4.1 Transform coefficients (TCOEFF)
Transform coefficient data is always present for all six blocks in a macroblock when MTYPE indicates INTRA. In other
cases MTYPE and CBP signal which blocks have coefficient data transmitted for them. The quantized transform coefficients
are sequentially transmitted according to the sequence given in Figure 12.
The most commonly occurring combinations of successive zeros (RUN) and the following value (LEVEL) are encoded with
variable length codes. Other combinations of (RUN, LEVEL) are encoded with a 20-bit word consisting of 6 bits ESCAPE, 6
bits RUN and 8 bits LEVEL. For the variable length encoding there are two code tables, one being used for the first
transmitted LEVEL in INTER, INTER+MC and INTER+MC+FIL blocks, the second for all other LEVELs except the first
one in INTRA blocks which is fixed length coded with 8 bits.
MVD
Code
–16 & 16
–15 & 17
–14 & 18
–13 & 19
–12 & 20
–11 & 21
–10 & 22
o
–9 & 23
o
–8 & 24
o
–7 & 25
o
–6 & 26
o
–5 & 27
o
–4 & 28
o
–3 & 29
o
–2 & 30
o
–1
& 23
o–
0
& 23
o–
1
& 23
o–
2 & –30
o–
3 & –29
o–
4 & –28
o–
5 & –27
o–
6 & –26
o–
7 & –25
o–
8 & –24
o–
9 & –23
–
10 & –22
–
11 & –21
–
12 & –20
–
13 & –19
–
14 & –18
–
15 & –17
0000 0011 001
0000 0011 011
0000 0011 101
0000 0011 111
0000 0100 001
0000 0100 011
0000 0100 11
1
0000 0101 01
1
0000 0101 11
1
0000 0111
111
0000 1001
110
0000 1011
110
0000 111
1 110
0001 1
111 110
0011
1111 110
011
1 0100 110
1
000 0100 110
010
00 0100 1
0010
1111 111
0001 0
111 111
0000 110
1 111
0000 1010
111
0000 1000
110
0000 0110
110
0000 0101
10
0
0000 0101 00
1
0000 0100 10
1
0000 0100 010
0000 0100 000
0000 0011 110
0000 0011 100
0000 0011 010
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