RG82865GV S L77X Intel, RG82865GV S L77X Datasheet - Page 173
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RG82865GV S L77X
Manufacturer Part Number
RG82865GV S L77X
Description
Manufacturer
Intel
Datasheet
1.RG82865GV_S_L77X.pdf
(250 pages)
Specifications of RG82865GV S L77X
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5.4.3
5.4.4
5.4.4.1
Intel
®
82865G/82865GV GMCH Datasheet
Cursor Plane
Video Engine
Hardware Motion Compensation
The Motion Compensation (MC) process consists of reconstructing a new picture by predicting
(either forward, backward, or bidirectionally) the resulting pixel colors from one or more reference
pictures. The GMCH receives the video stream and implements motion compensation and
subsequent steps in hardware. Performing Motion Compensation in hardware reduces the
processor demand of software-based MPEG-2 decoding, and thus improves system performance.
The motion compensation functionality is overloaded onto the texture cache and texture filter. The
texture cache is used to typically access the data in the reconstruction of the frames and the filter is
used in the actual motion compensation process. To support this overloaded functionality the
texture cache additionally supports the following input formats:
Sub-Picture Support
Sub-picture is used for two purposes; one is Subtitles for movie captions, etc., which are
superimposed on a main picture, and another is for Menus to provide some visual operation
environments for the user of the player.
DVD allows movie subtitles to be recorded as Sub-pictures. On a DVD disc, it is called “Subtitle”
because it has been prepared for storing captions. Since the disc can have a maximum of 32 tracks
for Subtitles, they can be used for various applications; for example, as Subtitles in different
languages or other information to be displayed.
There are two kinds of Menus, the System Menus and other In-Title Menus. First, the System
Menus are displayed and operated at startup of or during the playback of the disc or from the stop
state. Second, In-Title menus can be programmed as a combination of Sub-picture and Highlight
commands to be displayed during playback of the disc.
The GMCH supports sub-picture for DVD and DBS by mixing the two video streams via alpha
blending. Unlike color keying, alpha blending provides a softer effect and each pixel that is
displayed is a composite between the two video stream pixels. The GMCH can use four methods
when dealing with sub-pictures. The flexibility enables the GMCH to work with all sub-picture
formats.
Planes
A plane consists of a rectangular shaped image that has characteristics such as source, size,
position, method, and format. These planes get attached to source surfaces that are rectangular
memory surfaces with a similar set of characteristics. They are also associated with a particular
destination pipe.
The cursor plane is one of the simplest display planes. With a few exceptions, this plane has a fixed
size of 64x64 and a fixed Z-order (top). In legacy modes, cursor can cause the display data below it
to be inverted.
•
YUV420 planar
Functional Description
173
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