The patch number 14730 was added via Douglas Schilling Landgraf
<[email protected]>
to http://linuxtv.org/hg/v4l-dvb master development tree.
Kernel patches in this development tree may be modified to be backward
compatible with older kernels. Compatibility modifications will be
removed before inclusion into the mainstream Kernel
If anyone has any objections, please let us know by sending a message to:
Linux Media Mailing List <[email protected]>
------
From: Hans Verkuil <[email protected]>
v4l spec: document what odd and even fields are
Document that odd == top and even == bottom. I can never remember this,
so it is probably worth documenting.
Priority: normal
Signed-off-by: Hans Verkuil <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>
Signed-off-by: Douglas Schilling Landgraf <[email protected]>
---
linux/Documentation/DocBook/v4l/io.xml | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff -r ded9647e19b4 -r 8c4848794ab1 linux/Documentation/DocBook/v4l/io.xml
--- a/linux/Documentation/DocBook/v4l/io.xml Tue May 11 02:53:46 2010 -0300
+++ b/linux/Documentation/DocBook/v4l/io.xml Tue May 11 02:54:55 2010 -0300
@@ -918,8 +918,8 @@
<para>When the driver provides or accepts images field by field
rather than interleaved, it is also important applications understand
-how the fields combine to frames. We distinguish between top and
-bottom fields, the <emphasis>spatial order</emphasis>: The first line
+how the fields combine to frames. We distinguish between top (aka odd) and
+bottom (aka even) fields, the <emphasis>spatial order</emphasis>: The first
line
of the top field is the first line of an interlaced frame, the first
line of the bottom field is the second line of that frame.</para>
@@ -972,12 +972,12 @@
<row>
<entry><constant>V4L2_FIELD_TOP</constant></entry>
<entry>2</entry>
- <entry>Images consist of the top field only.</entry>
+ <entry>Images consist of the top (aka odd) field only.</entry>
</row>
<row>
<entry><constant>V4L2_FIELD_BOTTOM</constant></entry>
<entry>3</entry>
- <entry>Images consist of the bottom field only.
+ <entry>Images consist of the bottom (aka even) field only.
Applications may wish to prevent a device from capturing interlaced
images because they will have "comb" or "feathering" artefacts around
moving objects.</entry>
---
Patch is available at:
http://linuxtv.org/hg/v4l-dvb/rev/8c4848794ab1e176d8263b1b734f8c5abf325480
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