path: root/Documentation/DocBook/v4l/vidioc-query-dv-preset.xml
diff options
authorHans Verkuil <hverkuil@xs4all.nl>2010-05-09 06:54:46 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2010-06-01 01:20:21 -0300
commitf1158af2b2e064532470516943511863a873c5e5 (patch)
treeb8c62df367ed521e144e5c921e34be38b58e02e5 /Documentation/DocBook/v4l/vidioc-query-dv-preset.xml
parent51ff9ef13366b3752a8ab6229c466fd1bd671d3a (diff)
V4L/DVB: V4L2 Spec: Improve the VIDIOC_QUERY_DV_PRESET description
Make explicit what should happen when the input signal is missing, unreliable or does not map to a supported preset. Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'Documentation/DocBook/v4l/vidioc-query-dv-preset.xml')
1 files changed, 4 insertions, 2 deletions
diff --git a/Documentation/DocBook/v4l/vidioc-query-dv-preset.xml b/Documentation/DocBook/v4l/vidioc-query-dv-preset.xml
index 87e4f0f6151..402229ee06f 100644
--- a/Documentation/DocBook/v4l/vidioc-query-dv-preset.xml
+++ b/Documentation/DocBook/v4l/vidioc-query-dv-preset.xml
@@ -53,8 +53,10 @@ input</refpurpose>
automatically, similar to sensing the video standard. To do so, applications
call <constant> VIDIOC_QUERY_DV_PRESET</constant> with a pointer to a
&v4l2-dv-preset; type. Once the hardware detects a preset, that preset is
-returned in the preset field of &v4l2-dv-preset;. When detection is not
-possible or fails, the value V4L2_DV_INVALID is returned.</para>
+returned in the preset field of &v4l2-dv-preset;. If the preset could not be
+detected because there was no signal, or the signal was unreliable, or the
+signal did not map to a supported preset, then the value V4L2_DV_INVALID is