aboutsummaryrefslogtreecommitdiffstats
path: root/Documentation/DocBook/v4l/vidioc-dqevent.xml
diff options
context:
space:
mode:
Diffstat (limited to 'Documentation/DocBook/v4l/vidioc-dqevent.xml')
-rw-r--r--Documentation/DocBook/v4l/vidioc-dqevent.xml131
1 files changed, 131 insertions, 0 deletions
diff --git a/Documentation/DocBook/v4l/vidioc-dqevent.xml b/Documentation/DocBook/v4l/vidioc-dqevent.xml
new file mode 100644
index 000000000000..4e0a7cc30812
--- /dev/null
+++ b/Documentation/DocBook/v4l/vidioc-dqevent.xml
@@ -0,0 +1,131 @@
1<refentry id="vidioc-dqevent">
2 <refmeta>
3 <refentrytitle>ioctl VIDIOC_DQEVENT</refentrytitle>
4 &manvol;
5 </refmeta>
6
7 <refnamediv>
8 <refname>VIDIOC_DQEVENT</refname>
9 <refpurpose>Dequeue event</refpurpose>
10 </refnamediv>
11
12 <refsynopsisdiv>
13 <funcsynopsis>
14 <funcprototype>
15 <funcdef>int <function>ioctl</function></funcdef>
16 <paramdef>int <parameter>fd</parameter></paramdef>
17 <paramdef>int <parameter>request</parameter></paramdef>
18 <paramdef>struct v4l2_event
19*<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_DQEVENT</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>Dequeue an event from a video device. No input is required
53 for this ioctl. All the fields of the &v4l2-event; structure are
54 filled by the driver. The file handle will also receive exceptions
55 which the application may get by e.g. using the select system
56 call.</para>
57
58 <table frame="none" pgwide="1" id="v4l2-event">
59 <title>struct <structname>v4l2_event</structname></title>
60 <tgroup cols="4">
61 &cs-str;
62 <tbody valign="top">
63 <row>
64 <entry>__u32</entry>
65 <entry><structfield>type</structfield></entry>
66 <entry></entry>
67 <entry>Type of the event.</entry>
68 </row>
69 <row>
70 <entry>union</entry>
71 <entry><structfield>u</structfield></entry>
72 <entry></entry>
73 <entry></entry>
74 </row>
75 <row>
76 <entry></entry>
77 <entry>&v4l2-event-vsync;</entry>
78 <entry><structfield>vsync</structfield></entry>
79 <entry>Event data for event V4L2_EVENT_VSYNC.
80 </entry>
81 </row>
82 <row>
83 <entry></entry>
84 <entry>__u8</entry>
85 <entry><structfield>data</structfield>[64]</entry>
86 <entry>Event data. Defined by the event type. The union
87 should be used to define easily accessible type for
88 events.</entry>
89 </row>
90 <row>
91 <entry>__u32</entry>
92 <entry><structfield>pending</structfield></entry>
93 <entry></entry>
94 <entry>Number of pending events excluding this one.</entry>
95 </row>
96 <row>
97 <entry>__u32</entry>
98 <entry><structfield>sequence</structfield></entry>
99 <entry></entry>
100 <entry>Event sequence number. The sequence number is
101 incremented for every subscribed event that takes place.
102 If sequence numbers are not contiguous it means that
103 events have been lost.
104 </entry>
105 </row>
106 <row>
107 <entry>struct timespec</entry>
108 <entry><structfield>timestamp</structfield></entry>
109 <entry></entry>
110 <entry>Event timestamp.</entry>
111 </row>
112 <row>
113 <entry>__u32</entry>
114 <entry><structfield>reserved</structfield>[9]</entry>
115 <entry></entry>
116 <entry>Reserved for future extensions. Drivers must set
117 the array to zero.</entry>
118 </row>
119 </tbody>
120 </tgroup>
121 </table>
122
123 </refsect1>
124</refentry>
125<!--
126Local Variables:
127mode: sgml
128sgml-parent-document: "v4l2.sgml"
129indent-tabs-mode: nil
130End:
131-->