From 12c78e665f96b3f73dc0b6a6190a4871fe526293 Mon Sep 17 00:00:00 2001 From: Hans Verkuil Date: Fri, 18 Jul 2014 02:58:42 -0300 Subject: [media] DocBook media: document new VBI defines Add defines for the start line numbers of each field for both 525 and 625 line formats. Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- Documentation/DocBook/media/v4l/dev-raw-vbi.xml | 12 +++++++++--- Documentation/DocBook/media/v4l/dev-sliced-vbi.xml | 9 ++++++++- 2 files changed, 17 insertions(+), 4 deletions(-) (limited to 'Documentation/DocBook') diff --git a/Documentation/DocBook/media/v4l/dev-raw-vbi.xml b/Documentation/DocBook/media/v4l/dev-raw-vbi.xml index b788c72c885e..f4b61b6ce3c2 100644 --- a/Documentation/DocBook/media/v4l/dev-raw-vbi.xml +++ b/Documentation/DocBook/media/v4l/dev-raw-vbi.xml @@ -150,9 +150,15 @@ signal. Drivers shall not convert the sample format by software. This is the scanning system line number associated with the first line of the VBI image, of the first and the second field respectively. See and - for valid values. VBI input drivers can -return start values 0 if the hardware cannot reliable identify -scanning lines, VBI acquisition may not require this + for valid values. +The V4L2_VBI_ITU_525_F1_START, +V4L2_VBI_ITU_525_F2_START, +V4L2_VBI_ITU_625_F1_START and +V4L2_VBI_ITU_625_F2_START defines give the start line +numbers for each field for each 525 or 625 line format as a convenience. +Don't forget that ITU line numbering starts at 1, not 0. +VBI input drivers can return start values 0 if the hardware cannot +reliable identify scanning lines, VBI acquisition may not require this information. diff --git a/Documentation/DocBook/media/v4l/dev-sliced-vbi.xml b/Documentation/DocBook/media/v4l/dev-sliced-vbi.xml index 548f8ea28dee..7a8bf3011ee9 100644 --- a/Documentation/DocBook/media/v4l/dev-sliced-vbi.xml +++ b/Documentation/DocBook/media/v4l/dev-sliced-vbi.xml @@ -185,7 +185,14 @@ tables, sigh. --> Drivers must set service_lines[0][0] and -service_lines[1][0] to zero. +service_lines[1][0] to zero. +The V4L2_VBI_ITU_525_F1_START, +V4L2_VBI_ITU_525_F2_START, +V4L2_VBI_ITU_625_F1_START and +V4L2_VBI_ITU_625_F2_START defines give the start +line numbers for each field for each 525 or 625 line format as a +convenience. Don't forget that ITU line numbering starts at 1, not 0. + __u32 -- cgit