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參數(shù)資料
| 型號： | ADV601 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 視頻Codec |
| 英文描述： | Low Cost Multiformat Video Codec |
| 中文描述： | 低成本多格式視頻解碼器 |
| 文件頁數(shù)： | 13/52頁 |
| 文件大小： | 606K |
| 代理商： | ADV601 |
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ADV601
–13–
REV. 0
VIDEO AREA REGISTERS
The area defined by the HSTART, HEND, VSTART and VEND registers is the active area that the wavelet kernel processes. Video
data outside the active video area is set to minimum luminance and zero chrominance (black) by the ADV601. These registers allow
cropping of the input video during compression (encode only), but do not change the image size. Figure 10 shows how the video area
registers work together.
HSTART
0, 0
VSTART
VEND
HEND
ZERO
ZERO
ZERO
X, Y
ACTIVE VIDEO AREA
ZERO
ZERO
ZERO
ZERO
ZERO
MAX FOR SELECTED VIDEO MODE
Figure 10. Video Area and Video Area Registers
HSTART Register
Indirect (Write Only) Register Index 0x02
This register holds the setting for the horizontal start of the ADV601’s active video area. The value in this register is usually set to
zero, but in cases where you wish to crop incoming video it is possible to do so by changing HST.
[9:0]
Horizontal Start,
HST[9:0]
. 10-bit value defining the start of the active video region. (0 at reset)
[15:10] Reserved (always write zero)
HEND Register
Indirect (Write Only) Register Index 0x03
This register holds the setting for the horizontal end of the ADV601’s active video area. If the value is larger than the max size of the
selected video mode, the ADV601 uses the max size of the selected mode for HEND.
[9:0]
Horizontal End,
HEN[9:0]
.10-bit value defining the end of the active video region. (0x3FF at reset this value is larger than
the max size of the largest video mode)
[15:10] Reserved (always write zero)
VSTART Register
Indirect (Write Only) Register Index 0x04
This register holds the setting for the vertical start of the ADV601’s active video area. The value in this register is usually set to zero
unless you want to crop the active video.
To vertically crop video while encoding, program the VSTART and VEND registers with actual video line numbers, which differ for
each field. The VSTART and VEND contents must be updated on each field. Perform this updating as part of the field-by-field BW regis-
ter update process. To perform this dynamic update correctly, the update software must keep track of which field is being processed next.
[9:0]
Vertical Start,
VST[9:0]
. 10-bit value defining the starting line of the active video region, with line numbers from 1-to-625
in PAL and 1-to-525 in NTSC. (0 at reset)
[15:10] Reserved (always write zero)
VEND Register
Indirect (Write Only) Register Index 0x05
This register holds the setting for the vertical end of the ADV601’s active video area. If the value is larger than the max size of the
selected video mode, the ADV601 uses the max size of the selected mode for VEND.
To vertically crop video while encoding, program the VSTART and VEND registers with actual video line numbers, which differ for
each field. The VSTART and VEND contents must be updated on each field. Perform this updating as part of the field-by-field BW
register update process. To perform this dynamic update correctly, the update software must keep track of which field is being pro-
cessed next.
[9:0]
Vertical End,
VEN[9:0]
. 10-bit value defining the ending line of the active video region, with line numbers from 1-to-625
in PAL and 1-to-525 in NTSC. (0x3FF at reset—this value is larger than the max size of the largest video mode)
[15:10] Reserved (always write zero)
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ADV601E-VIDEOPIPE | 制造商:Analog Devices 功能描述:VIDEOPIPE |
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| ADV601LCERAG1266B-0.5 | 制造商:Analog Devices 功能描述: |
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