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| author | Hans Verkuil <hans.verkuil@cisco.com> | 2012-09-14 12:40:43 +0200 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2012-09-26 15:41:41 +0200 |
| commit | 06fce2861d5a4ebcff65e253b2b3e4406dc3ab24 (patch) | |
| tree | 5d28082d4c0aa2f20201e9c5b97ef4b0fcbc468c /Documentation/DocBook | |
| parent | [media] DocBook: clarify that sequence is also set for output devices (diff) | |
| download | linux-06fce2861d5a4ebcff65e253b2b3e4406dc3ab24.tar.xz linux-06fce2861d5a4ebcff65e253b2b3e4406dc3ab24.zip | |
[media] DocBook: Mark CROPCAP as optional instead of as compulsory
While the documentation says that VIDIOC_CROPCAP is compulsory for
all video capture and output devices, in practice VIDIOC_CROPCAP is
only implemented for devices that can do cropping and/or scaling.
Update the documentation to no longer require VIDIOC_CROPCAP if the
driver does not support cropping or scaling or non-square pixels.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Reviewed-by: Sakari Ailus <sakari.ailus@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'Documentation/DocBook')
| -rw-r--r-- | Documentation/DocBook/media/v4l/vidioc-cropcap.xml | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/Documentation/DocBook/media/v4l/vidioc-cropcap.xml b/Documentation/DocBook/media/v4l/vidioc-cropcap.xml index 4559c452a613..bf7cc979fdfa 100644 --- a/Documentation/DocBook/media/v4l/vidioc-cropcap.xml +++ b/Documentation/DocBook/media/v4l/vidioc-cropcap.xml @@ -59,6 +59,9 @@ constant except when switching the video standard. Remember this switch can occur implicit when switching the video input or output.</para> + <para>This ioctl must be implemented for video capture or output devices that +support cropping and/or scaling and/or have non-square pixels, and for overlay devices.</para> + <table pgwide="1" frame="none" id="v4l2-cropcap"> <title>struct <structname>v4l2_cropcap</structname></title> <tgroup cols="3"> @@ -70,7 +73,9 @@ output.</para> <entry>Type of the data stream, set by the application. Only these types are valid here: <constant>V4L2_BUF_TYPE_VIDEO_CAPTURE</constant>, -<constant>V4L2_BUF_TYPE_VIDEO_OUTPUT</constant> and +<constant>V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE</constant>, +<constant>V4L2_BUF_TYPE_VIDEO_OUTPUT</constant>, +<constant>V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE</constant> and <constant>V4L2_BUF_TYPE_VIDEO_OVERLAY</constant>. See <xref linkend="v4l2-buf-type" />.</entry> </row> <row> @@ -154,8 +159,7 @@ on 22 Oct 2002 subject "Re:[V4L][patches!] Re:v4l2/kernel-2.5" --> <term><errorcode>EINVAL</errorcode></term> <listitem> <para>The &v4l2-cropcap; <structfield>type</structfield> is -invalid. This is not permitted for video capture, output and overlay devices, -which must support <constant>VIDIOC_CROPCAP</constant>.</para> +invalid.</para> </listitem> </varlistentry> </variablelist> |