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Display Width
Display height
H
e
i
g
h
t
(x, y)
Input source width
Background color
Internal Modules
74
SPRUHI7A – December 2012 – Revised June 2016
Copyright © 2012–2016, Texas Instruments Incorporated
High-Definition Video Processing Subsystem (HDVPSS)
1.2.3.3
Input Sources
Each blender in COMP module receives up to five input sources (four for SD) to blend and send the
composited output to the corresponding VENC. Five input sources to a blender are as follows :
1. Video-0 (HD main video/ HD main video CIT/ SD video)
2. Video-1 (HD pip video; Not available for SD output)
3. Grpx-0
4. Grpx-1
5. Grpx-2
All the inputs that are connected to a single blender should:
•
Have the same size of its corresponding VENC display size. This is done by forming a WINDOW
(shown below) in the upstream modules. Please note that it does NOT imply any restriction on the
actual input video sizes in external memory to be the same. For example, Video-0 can be 1920x1080
and Video-1 can be 720x480 in the memory.
•
Carry their priority levels (if g_reorder =0) to re-order themselves as layers on the final display stream
(only for graphic inputs) and
•
Carry alpha values used to blend with each other using the above priority levels.
It is necessary to configure upstream modules (to blender) to supply each input of full display size to the
blender. If the size of any window is not the same as the display size, background color is inserted in the
remaining portion as shown below. The upstream modules include:
1. VCOMP (for HD main video - CIT and non-CIT)
2. CIG (for HD PIP video)
3. VPDMA SD Video (for SD Video)
4. GRPX-0 (for Grpx-0 input)
5. GRPX-1 (for Grpx-1 input)
6. GRPX-2 (for Grpx-2 input)
Display width and display height parameters come from VENC module settings, as shown in
Figure 1-32. Display Width and Height Parameters