diff options
Diffstat (limited to 'Documentation/DocBook/media/v4l/vidioc-querystd.xml')
| -rw-r--r-- | Documentation/DocBook/media/v4l/vidioc-querystd.xml | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/Documentation/DocBook/media/v4l/vidioc-querystd.xml b/Documentation/DocBook/media/v4l/vidioc-querystd.xml new file mode 100644 index 000000000000..4b79c7c04ed6 --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-querystd.xml | |||
| @@ -0,0 +1,66 @@ | |||
| 1 | <refentry id="vidioc-querystd"> | ||
| 2 | <refmeta> | ||
| 3 | <refentrytitle>ioctl VIDIOC_QUERYSTD</refentrytitle> | ||
| 4 | &manvol; | ||
| 5 | </refmeta> | ||
| 6 | |||
| 7 | <refnamediv> | ||
| 8 | <refname>VIDIOC_QUERYSTD</refname> | ||
| 9 | <refpurpose>Sense the video standard received by the current | ||
| 10 | input</refpurpose> | ||
| 11 | </refnamediv> | ||
| 12 | |||
| 13 | <refsynopsisdiv> | ||
| 14 | <funcsynopsis> | ||
| 15 | <funcprototype> | ||
| 16 | <funcdef>int <function>ioctl</function></funcdef> | ||
| 17 | <paramdef>int <parameter>fd</parameter></paramdef> | ||
| 18 | <paramdef>int <parameter>request</parameter></paramdef> | ||
| 19 | <paramdef>v4l2_std_id *<parameter>argp</parameter></paramdef> | ||
| 20 | </funcprototype> | ||
| 21 | </funcsynopsis> | ||
| 22 | </refsynopsisdiv> | ||
| 23 | |||
| 24 | <refsect1> | ||
| 25 | <title>Arguments</title> | ||
| 26 | |||
| 27 | <variablelist> | ||
| 28 | <varlistentry> | ||
| 29 | <term><parameter>fd</parameter></term> | ||
| 30 | <listitem> | ||
| 31 | <para>&fd;</para> | ||
| 32 | </listitem> | ||
| 33 | </varlistentry> | ||
| 34 | <varlistentry> | ||
| 35 | <term><parameter>request</parameter></term> | ||
| 36 | <listitem> | ||
| 37 | <para>VIDIOC_QUERYSTD</para> | ||
| 38 | </listitem> | ||
| 39 | </varlistentry> | ||
| 40 | <varlistentry> | ||
| 41 | <term><parameter>argp</parameter></term> | ||
| 42 | <listitem> | ||
| 43 | <para></para> | ||
| 44 | </listitem> | ||
| 45 | </varlistentry> | ||
| 46 | </variablelist> | ||
| 47 | </refsect1> | ||
| 48 | |||
| 49 | <refsect1> | ||
| 50 | <title>Description</title> | ||
| 51 | |||
| 52 | <para>The hardware may be able to detect the current video | ||
| 53 | standard automatically. To do so, applications call <constant> | ||
| 54 | VIDIOC_QUERYSTD</constant> with a pointer to a &v4l2-std-id; type. The | ||
| 55 | driver stores here a set of candidates, this can be a single flag or a | ||
| 56 | set of supported standards if for example the hardware can only | ||
| 57 | distinguish between 50 and 60 Hz systems. When detection is not | ||
| 58 | possible or fails, the set must contain all standards supported by the | ||
| 59 | current video input or output.</para> | ||
| 60 | |||
| 61 | </refsect1> | ||
| 62 | |||
| 63 | <refsect1> | ||
| 64 | &return-value; | ||
| 65 | </refsect1> | ||
| 66 | </refentry> | ||