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| author | Hans Verkuil <hans.verkuil@cisco.com> | 2013-05-29 15:19:05 +0200 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2013-06-17 14:45:56 +0200 |
| commit | f41c4332cfeae59e78aeda6c4eb9d0f4d42adbf2 (patch) | |
| tree | 7c8b585b329f6d02bcaf1ffa5f154226857e3824 /Documentation/DocBook | |
| parent | [media] v4l2-ioctl: clarify querystd comment (diff) | |
| download | linux-f41c4332cfeae59e78aeda6c4eb9d0f4d42adbf2.tar.xz linux-f41c4332cfeae59e78aeda6c4eb9d0f4d42adbf2.zip | |
[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: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'Documentation/DocBook')
| -rw-r--r-- | Documentation/DocBook/media/v4l/vidioc-querystd.xml | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/Documentation/DocBook/media/v4l/vidioc-querystd.xml b/Documentation/DocBook/media/v4l/vidioc-querystd.xml index fe80a183d957..222348542182 100644 --- a/Documentation/DocBook/media/v4l/vidioc-querystd.xml +++ b/Documentation/DocBook/media/v4l/vidioc-querystd.xml @@ -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> |