134 lines
3.6 KiB
XML
134 lines
3.6 KiB
XML
<refentry id="vidioc-subscribe-event">
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<refmeta>
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<refentrytitle>ioctl VIDIOC_SUBSCRIBE_EVENT, VIDIOC_UNSUBSCRIBE_EVENT</refentrytitle>
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&manvol;
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</refmeta>
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<refnamediv>
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<refname>VIDIOC_SUBSCRIBE_EVENT, VIDIOC_UNSUBSCRIBE_EVENT</refname>
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<refpurpose>Subscribe or unsubscribe event</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<funcsynopsis>
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<funcprototype>
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<funcdef>int <function>ioctl</function></funcdef>
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<paramdef>int <parameter>fd</parameter></paramdef>
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<paramdef>int <parameter>request</parameter></paramdef>
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<paramdef>struct v4l2_event_subscription
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*<parameter>argp</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Arguments</title>
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<variablelist>
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<varlistentry>
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<term><parameter>fd</parameter></term>
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<listitem>
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<para>&fd;</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>request</parameter></term>
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<listitem>
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<para>VIDIOC_SUBSCRIBE_EVENT, VIDIOC_UNSUBSCRIBE_EVENT</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>argp</parameter></term>
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<listitem>
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<para></para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Description</title>
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<para>Subscribe or unsubscribe V4L2 event. Subscribed events are
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dequeued by using the &VIDIOC-DQEVENT; ioctl.</para>
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<table frame="none" pgwide="1" id="v4l2-event-subscription">
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<title>struct <structname>v4l2_event_subscription</structname></title>
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<tgroup cols="3">
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&cs-str;
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<tbody valign="top">
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<row>
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<entry>__u32</entry>
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<entry><structfield>type</structfield></entry>
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<entry>Type of the event.</entry>
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</row>
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<row>
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<entry>__u32</entry>
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<entry><structfield>reserved</structfield>[7]</entry>
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<entry>Reserved for future extensions. Drivers and applications
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must set the array to zero.</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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<table frame="none" pgwide="1" id="event-type">
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<title>Event Types</title>
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<tgroup cols="3">
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&cs-def;
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<tbody valign="top">
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<row>
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<entry><constant>V4L2_EVENT_ALL</constant></entry>
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<entry>0</entry>
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<entry>All events. V4L2_EVENT_ALL is valid only for
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VIDIOC_UNSUBSCRIBE_EVENT for unsubscribing all events at once.
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</entry>
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</row>
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<row>
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<entry><constant>V4L2_EVENT_VSYNC</constant></entry>
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<entry>1</entry>
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<entry>This event is triggered on the vertical sync.
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This event has &v4l2-event-vsync; associated with it.
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</entry>
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</row>
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<row>
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<entry><constant>V4L2_EVENT_EOS</constant></entry>
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<entry>2</entry>
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<entry>This event is triggered when the end of a stream is reached.
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This is typically used with MPEG decoders to report to the application
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when the last of the MPEG stream has been decoded.
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</entry>
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</row>
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<row>
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<entry><constant>V4L2_EVENT_PRIVATE_START</constant></entry>
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<entry>0x08000000</entry>
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<entry>Base event number for driver-private events.</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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<table frame="none" pgwide="1" id="v4l2-event-vsync">
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<title>struct <structname>v4l2_event_vsync</structname></title>
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<tgroup cols="3">
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&cs-str;
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<tbody valign="top">
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<row>
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<entry>__u8</entry>
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<entry><structfield>field</structfield></entry>
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<entry>The upcoming field. See &v4l2-field;.</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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</refsect1>
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</refentry>
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<!--
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Local Variables:
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mode: sgml
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sgml-parent-document: "v4l2.sgml"
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indent-tabs-mode: nil
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End:
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-->
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