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| author | Hans Verkuil <hverkuil-cisco@xs4all.nl> | 2022-05-23 10:24:12 +0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@kernel.org> | 2022-06-20 12:30:31 +0300 |
| commit | d7365ae8ea9f49da2841872176efdb609f3426b6 (patch) | |
| tree | 2a5e00a121303f3cac431128f10001896f1d297b | |
| parent | 5374d8fb75f313294c7d97e85c22bead34d63f2b (diff) | |
| download | linux-d7365ae8ea9f49da2841872176efdb609f3426b6.tar.xz | |
media: vivid.rst: document HDMI Video Guard Band control
Document this new vivid test control.
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
| -rw-r--r-- | Documentation/admin-guide/media/vivid.rst | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/Documentation/admin-guide/media/vivid.rst b/Documentation/admin-guide/media/vivid.rst index 6d7175f96f74..4f680dc9661c 100644 --- a/Documentation/admin-guide/media/vivid.rst +++ b/Documentation/admin-guide/media/vivid.rst @@ -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 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ |