ZR36050 Просмотр технического описания (PDF) - Zoran Corporation
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ZR36050 Datasheet PDF : 52 Pages
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ADVANCE INFORMATION
ZR36050
Table 12. JPEG Lossless Marker Segments (Continued)
Address
Content
Description
0C0
DRI[FF]
Restart Interval definition. This six-byte segment is used in both the encoding and decoding modes. In the case
of multiple DRI markers in the compressed file, the old DRI is overwritten with the new. The RSTs are also
written in the first two bytes of this segment during decoding. The host can distinguish between an RST and a
DRI by their marker codes.
0C1
DRI[DD]
0C2
LEN[00]
0C3
LEN[04]
0C4
RI(H)
Most significant byte of length of Restart Interval in MCU’s
0C5
RI(L)
Least significant byte of length of Restart Interval in MCU’s
0C6
DNL[FF]
Define number of lines. DNL is a six-byte segment used in the first scan of encoding and decoding modes.
0C7
DNL[DC]
0C8
LEN[00]
0C9
LEN[04]
0CA
Y(H)
Most significant byte of number of Lines
0CB
Y(L)
Least significant byte of number of Lines
0CC
[00]
••
•
1D3
[00]
1D4
DHT[FF]
Huffman tables definition. This variable-length segment contains up to 422 bytes used in both the encoding and
decoding modes. It can save up to two DC tables for JPEG Lossless mode. In the case of multiple DHT marker
segments in the compressed file, the old DHT is overwritten with the new. If there are fewer than four Huffman
tables, the remaining memory locations are left unused. The following example depicts two DC tables for 12-bit
precision. Typically only 2 DC Huffman code tables are used in JPEG Lossless.
1D5
DHT[C4]
1D6
LEN(H)
1D7
LEN(L)
1D8
Nt[00]
Start definition of the first DC Huffman table
1D9
L1
••
•
1E8
L16
1E9
V1
••
•
1F5
V13
1F6
Nt[01]
Start definition of the second DC Huffman table
1F7
L1
•
•
•
206
L16
41
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