iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

media: vivid.rst: document HDMI Video Guard Band control

Browse Source 
Document this new vivid test control.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Hans Verkuil 2022-05-23 08:24:12 +01:00 committed by Mauro Carvalho Chehab
parent 5374d8fb75
commit d7365ae8ea
1 changed files with 14 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
Documentation/admin-guide/media/vivid.rst
View File

@ -714,6 +714,20 @@ The Test Pattern Controls are all specific to video capture.
does the same for the EAV (End of Active Video) code.
- Insert Video Guard Band
adds 4 columns of pixels with the HDMI Video Guard Band code at the
left hand side of the image. This only works with 3 or 4 byte RGB pixel
formats. The RGB pixel value 0xab/0x55/0xab turns out to be equivalent
to the HDMI Video Guard Band code that precedes each active video line
(see section 5.2.2.1 in the HDMI 1.3 Specification). To test if a video
receiver has correct HDMI Video Guard Band processing, enable this
control and then move the image to the left hand side of the screen.
That will result in video lines that start with multiple pixels that
have the same value as the Video Guard Band that precedes them.
Receivers that will just keep skipping Video Guard Band values will
now fail and either loose sync or these video lines will shift.
Capture Feature Selection Controls
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^