From: Hans Verkuil hans.verk...@cisco.com
The Video Standard section contains some awkward language. It also wasn't
updated when the error code for unimplemented ioctls changed from EINVAL
to ENOTTY.
Signed-off-by: Hans Verkuil hans.verk...@cisco.com
---
Documentation/DocBook/media/v4l/common.xml | 18 +-
1 file changed, 9 insertions(+), 9 deletions(-)
diff --git a/Documentation/DocBook/media/v4l/common.xml
b/Documentation/DocBook/media/v4l/common.xml
index b91d253..9378d7b 100644
--- a/Documentation/DocBook/media/v4l/common.xml
+++ b/Documentation/DocBook/media/v4l/common.xml
@@ -589,8 +589,8 @@ switch to a standard by v4l2-std-id;./para
when the device has one or more video inputs or outputs./para
paraSpecial rules apply to USB cameras where the notion of video
-standards makes little sense. More generally any capture device,
-output devices accordingly, which is itemizedlist
+standards makes little sense. More generally for any capture or output device
+which is: itemizedlist
listitem
paraincapable of capturing fields or frames at the nominal
rate of the video standard, or/para
@@ -605,17 +605,17 @@ capture time, or/para
refer to the frames received by the driver, not the captured
frames./para
/listitem
- /itemizedlist Here the driver shall set the
+ /itemizedlist the driver shall set the
structfieldstd/structfield field of v4l2-input; and v4l2-output;
-to zero, the constantVIDIOC_G_STD/constant,
+to zero and the constantVIDIOC_G_STD/constant,
constantVIDIOC_S_STD/constant,
constantVIDIOC_QUERYSTD/constant and
constantVIDIOC_ENUMSTD/constant ioctls shall return the
-EINVAL;.footnote
- paraSee xref linkend=buffer / for a rationale. Probably
-even USB cameras follow some well known video standard. It might have
-been better to explicitly indicate elsewhere if a device cannot live
-up to normal expectations, instead of this exception./para
+ENOTTY;.footnote
+ paraSee xref linkend=buffer / for a rationale./para
+ paraApplications can make use of the xref
linkend=input-capabilities / and
+xref linkend=output-capabilities/ flags to determine whether the video
standard ioctls
+are available for the device./para
/footnote/para
example
--
1.7.10.4
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