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Commit f41c4332 authored by Hans Verkuil's avatar Hans Verkuil Committed by Mauro Carvalho Chehab
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[media] DocBook/media/v4l: clarify the QUERYSTD documentation 



Explicitly mention that this ioctl should return V4L2_STD_UNKNOWN if
not signal was detected.

Signed-off-by: default avatarHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent 1a2c6866

Documentation/DocBook/media/v4l/vidioc-querystd.xml

+2 −1
Original line number Diff line number Diff line
@@ -54,7 +54,8 @@ standard automatically. To do so, applications call <constant> 
VIDIOC_QUERYSTD</constant> with a pointer to a &v4l2-std-id; type. The

driver stores here a set of candidates, this can be a single flag or a

set of supported standards if for example the hardware can only

distinguish between 50 and 60 Hz systems. When detection is not

distinguish between 50 and 60 Hz systems. If no signal was detected,

then the driver will return V4L2_STD_UNKNOWN. When detection is not

possible or fails, the set must contain all standards supported by the

current video input or output.</para>