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[media] DocBook media: improve V4L2_DV_FL_HALF_LINE documentation

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Explicitly specify where the half-line is added or removed in
each field.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Cc: Prashant Laddha <prladdha@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Hans Verkuil 2015-03-20 14:05:02 -03:00 committed by Mauro Carvalho Chehab
parent e202e515b7
commit 924b34ea48
1 changed files with 5 additions and 4 deletions
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Documentation/DocBook/media/v4l/vidioc-g-dv-timings.xml
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@ -318,10 +318,11 @@ can't generate such frequencies, then the flag will also be cleared.
</row>
<row>
<entry>V4L2_DV_FL_HALF_LINE</entry>
<entry>Specific to interlaced formats: if set, then field 1 (aka the odd field)
is really one half-line longer and field 2 (aka the even field) is really one half-line
shorter, so each field has exactly the same number of half-lines. Whether half-lines can be
detected or used depends on the hardware.
<entry>Specific to interlaced formats: if set, then the vertical frontporch
of field 1 (aka the odd field) is really one half-line longer and the vertical backporch
of field 2 (aka the even field) is really one half-line shorter, so each field has exactly
the same number of half-lines. Whether half-lines can be detected or used depends on
the hardware.
</entry>
</row>
</tbody>