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| author | Hans Verkuil <hverkuil@xs4all.nl> | 2014-07-21 17:16:47 +0400 |
|---|---|---|
| committer | Mauro Carvalho Chehab <m.chehab@samsung.com> | 2014-07-26 02:17:15 +0400 |
| commit | 592d1349f719db7c071ba9f4ade272be114b4196 (patch) | |
| tree | 23a7eebf1bb1258f783f55721166486442270756 /Documentation/DocBook | |
| parent | e87b540be2dd02552fb9244d50ae8b4e4619a34b (diff) | |
| download | linux-592d1349f719db7c071ba9f4ade272be114b4196.tar.xz | |
[media] Docbook/media: improve data_offset/bytesused documentation
This patch explicitly documents the relationship between bytesused and data_offset.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Diffstat (limited to 'Documentation/DocBook')
| -rw-r--r-- | Documentation/DocBook/media/v4l/io.xml | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/Documentation/DocBook/media/v4l/io.xml b/Documentation/DocBook/media/v4l/io.xml index 8c4ee746a731..e5e8325aa3d7 100644 --- a/Documentation/DocBook/media/v4l/io.xml +++ b/Documentation/DocBook/media/v4l/io.xml @@ -870,7 +870,8 @@ should set this to 0.</entry> If the application sets this to 0 for an output stream, then <structfield>bytesused</structfield> will be set to the size of the plane (see the <structfield>length</structfield> field of this struct) - by the driver.</entry> + by the driver. Note that the actual image data starts at + <structfield>data_offset</structfield> which may not be 0.</entry> </row> <row> <entry>__u32</entry> @@ -919,6 +920,10 @@ should set this to 0.</entry> <entry>Offset in bytes to video data in the plane. Drivers must set this field when <structfield>type</structfield> refers to an input stream, applications when it refers to an output stream. + Note that data_offset is included in <structfield>bytesused</structfield>. + So the size of the image in the plane is + <structfield>bytesused</structfield>-<structfield>data_offset</structfield> at + offset <structfield>data_offset</structfield> from the start of the plane. </entry> </row> <row> |