Commit d7365ae8 authored by Hans Verkuil's avatar Hans Verkuil Committed by Mauro Carvalho Chehab
Browse files

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



Document this new vivid test control.

Signed-off-by: default avatarHans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@kernel.org>
parent 5374d8fb

Documentation/admin-guide/media/vivid.rst

+14 −0
Original line number Diff line number Diff line
@@ -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

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^