You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
133 lines
3.6 KiB
133 lines
3.6 KiB
<refentry id="vidioc-subscribe-event">
|
|
<refmeta>
|
|
<refentrytitle>ioctl VIDIOC_SUBSCRIBE_EVENT, VIDIOC_UNSUBSCRIBE_EVENT</refentrytitle>
|
|
&manvol;
|
|
</refmeta>
|
|
|
|
<refnamediv>
|
|
<refname>VIDIOC_SUBSCRIBE_EVENT, VIDIOC_UNSUBSCRIBE_EVENT</refname>
|
|
<refpurpose>Subscribe or unsubscribe event</refpurpose>
|
|
</refnamediv>
|
|
|
|
<refsynopsisdiv>
|
|
<funcsynopsis>
|
|
<funcprototype>
|
|
<funcdef>int <function>ioctl</function></funcdef>
|
|
<paramdef>int <parameter>fd</parameter></paramdef>
|
|
<paramdef>int <parameter>request</parameter></paramdef>
|
|
<paramdef>struct v4l2_event_subscription
|
|
*<parameter>argp</parameter></paramdef>
|
|
</funcprototype>
|
|
</funcsynopsis>
|
|
</refsynopsisdiv>
|
|
|
|
<refsect1>
|
|
<title>Arguments</title>
|
|
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><parameter>fd</parameter></term>
|
|
<listitem>
|
|
<para>&fd;</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><parameter>request</parameter></term>
|
|
<listitem>
|
|
<para>VIDIOC_SUBSCRIBE_EVENT, VIDIOC_UNSUBSCRIBE_EVENT</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><parameter>argp</parameter></term>
|
|
<listitem>
|
|
<para></para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Description</title>
|
|
|
|
<para>Subscribe or unsubscribe V4L2 event. Subscribed events are
|
|
dequeued by using the &VIDIOC-DQEVENT; ioctl.</para>
|
|
|
|
<table frame="none" pgwide="1" id="v4l2-event-subscription">
|
|
<title>struct <structname>v4l2_event_subscription</structname></title>
|
|
<tgroup cols="3">
|
|
&cs-str;
|
|
<tbody valign="top">
|
|
<row>
|
|
<entry>__u32</entry>
|
|
<entry><structfield>type</structfield></entry>
|
|
<entry>Type of the event.</entry>
|
|
</row>
|
|
<row>
|
|
<entry>__u32</entry>
|
|
<entry><structfield>reserved</structfield>[7]</entry>
|
|
<entry>Reserved for future extensions. Drivers and applications
|
|
must set the array to zero.</entry>
|
|
</row>
|
|
</tbody>
|
|
</tgroup>
|
|
</table>
|
|
|
|
<table frame="none" pgwide="1" id="event-type">
|
|
<title>Event Types</title>
|
|
<tgroup cols="3">
|
|
&cs-def;
|
|
<tbody valign="top">
|
|
<row>
|
|
<entry><constant>V4L2_EVENT_ALL</constant></entry>
|
|
<entry>0</entry>
|
|
<entry>All events. V4L2_EVENT_ALL is valid only for
|
|
VIDIOC_UNSUBSCRIBE_EVENT for unsubscribing all events at once.
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry><constant>V4L2_EVENT_VSYNC</constant></entry>
|
|
<entry>1</entry>
|
|
<entry>This event is triggered on the vertical sync.
|
|
This event has &v4l2-event-vsync; associated with it.
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry><constant>V4L2_EVENT_EOS</constant></entry>
|
|
<entry>2</entry>
|
|
<entry>This event is triggered when the end of a stream is reached.
|
|
This is typically used with MPEG decoders to report to the application
|
|
when the last of the MPEG stream has been decoded.
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry><constant>V4L2_EVENT_PRIVATE_START</constant></entry>
|
|
<entry>0x08000000</entry>
|
|
<entry>Base event number for driver-private events.</entry>
|
|
</row>
|
|
</tbody>
|
|
</tgroup>
|
|
</table>
|
|
|
|
<table frame="none" pgwide="1" id="v4l2-event-vsync">
|
|
<title>struct <structname>v4l2_event_vsync</structname></title>
|
|
<tgroup cols="3">
|
|
&cs-str;
|
|
<tbody valign="top">
|
|
<row>
|
|
<entry>__u8</entry>
|
|
<entry><structfield>field</structfield></entry>
|
|
<entry>The upcoming field. See &v4l2-field;.</entry>
|
|
</row>
|
|
</tbody>
|
|
</tgroup>
|
|
</table>
|
|
|
|
</refsect1>
|
|
</refentry>
|
|
<!--
|
|
Local Variables:
|
|
mode: sgml
|
|
sgml-parent-document: "v4l2.sgml"
|
|
indent-tabs-mode: nil
|
|
End:
|
|
-->
|
|
|