gstreamer1.0-plugins-base-doc 1.8.0-1ubuntu1 / usr / share / gtk-doc / html / gst-plugins-base-libs-1.0 / gst-plugins-base-libs-gstnavigation.html

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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>gstnavigation: GStreamer Base Plugins 1.0 Library Reference Manual</title>
<meta name="generator" content="DocBook XSL Stylesheets V1.79.1">
<link rel="home" href="index.html" title="GStreamer Base Plugins 1.0 Library Reference Manual">
<link rel="up" href="gstreamer-video.html" title="Video Library">
<link rel="prev" href="gst-plugins-base-libs-gstvideoutils.html" title="gstvideoutils">
<link rel="next" href="gstreamer-libs-hierarchy.html" title="Part II. Object Hierarchy">
<meta name="generator" content="GTK-Doc V1.24 (XML mode)">
<link rel="stylesheet" href="style.css" type="text/css">
</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
<table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="5"><tr valign="middle">
<td width="100%" align="left" class="shortcuts">
<a href="#" class="shortcut">Top</a><span id="nav_description">  <span class="dim">|</span> 
                  <a href="#gst-plugins-base-libs-gstnavigation.description" class="shortcut">Description</a></span><span id="nav_hierarchy">  <span class="dim">|</span> 
                  <a href="#gst-plugins-base-libs-gstnavigation.object-hierarchy" class="shortcut">Object Hierarchy</a></span>
</td>
<td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td>
<td><a accesskey="u" href="gstreamer-video.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td>
<td><a accesskey="p" href="gst-plugins-base-libs-gstvideoutils.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td>
<td><a accesskey="n" href="gstreamer-libs-hierarchy.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td>
</tr></table>
<div class="refentry">
<a name="gst-plugins-base-libs-gstnavigation"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="gst-plugins-base-libs-gstnavigation.top_of_page"></a>gstnavigation</span></h2>
<p>gstnavigation — Interface for creating, sending and parsing navigation
events.</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstnavigation.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstnavigation.html#gst-navigation-send-event" title="gst_navigation_send_event ()">gst_navigation_send_event</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstnavigation.html#gst-navigation-send-key-event" title="gst_navigation_send_key_event ()">gst_navigation_send_key_event</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstnavigation.html#gst-navigation-send-mouse-event" title="gst_navigation_send_mouse_event ()">gst_navigation_send_mouse_event</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstnavigation.html#gst-navigation-send-command" title="gst_navigation_send_command ()">gst_navigation_send_command</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstnavigation.html#gst-navigation-event-parse-command" title="gst_navigation_event_parse_command ()">gst_navigation_event_parse_command</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstnavigation.html#gst-navigation-event-parse-key-event" title="gst_navigation_event_parse_key_event ()">gst_navigation_event_parse_key_event</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstnavigation.html#gst-navigation-event-parse-mouse-button-event" title="gst_navigation_event_parse_mouse_button_event ()">gst_navigation_event_parse_mouse_button_event</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstnavigation.html#gst-navigation-event-parse-mouse-move-event" title="gst_navigation_event_parse_mouse_move_event ()">gst_navigation_event_parse_mouse_move_event</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigationMessageType" title="enum GstNavigationMessageType"><span class="returnvalue">GstNavigationMessageType</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstnavigation.html#gst-navigation-message-get-type" title="gst_navigation_message_get_type ()">gst_navigation_message_get_type</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstMessage.html"><span class="returnvalue">GstMessage</span></a> *
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstnavigation.html#gst-navigation-message-new-angles-changed" title="gst_navigation_message_new_angles_changed ()">gst_navigation_message_new_angles_changed</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstMessage.html"><span class="returnvalue">GstMessage</span></a> *
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstnavigation.html#gst-navigation-message-new-commands-changed" title="gst_navigation_message_new_commands_changed ()">gst_navigation_message_new_commands_changed</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstMessage.html"><span class="returnvalue">GstMessage</span></a> *
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstnavigation.html#gst-navigation-message-new-event" title="gst_navigation_message_new_event ()">gst_navigation_message_new_event</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstMessage.html"><span class="returnvalue">GstMessage</span></a> *
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstnavigation.html#gst-navigation-message-new-mouse-over" title="gst_navigation_message_new_mouse_over ()">gst_navigation_message_new_mouse_over</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstnavigation.html#gst-navigation-message-parse-angles-changed" title="gst_navigation_message_parse_angles_changed ()">gst_navigation_message_parse_angles_changed</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstnavigation.html#gst-navigation-message-parse-event" title="gst_navigation_message_parse_event ()">gst_navigation_message_parse_event</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstnavigation.html#gst-navigation-message-parse-mouse-over" title="gst_navigation_message_parse_mouse_over ()">gst_navigation_message_parse_mouse_over</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstQuery.html"><span class="returnvalue">GstQuery</span></a> *
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstnavigation.html#gst-navigation-query-new-angles" title="gst_navigation_query_new_angles ()">gst_navigation_query_new_angles</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigationQueryType" title="enum GstNavigationQueryType"><span class="returnvalue">GstNavigationQueryType</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstnavigation.html#gst-navigation-query-get-type" title="gst_navigation_query_get_type ()">gst_navigation_query_get_type</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstQuery.html"><span class="returnvalue">GstQuery</span></a> *
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstnavigation.html#gst-navigation-query-new-commands" title="gst_navigation_query_new_commands ()">gst_navigation_query_new_commands</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstnavigation.html#gst-navigation-query-parse-angles" title="gst_navigation_query_parse_angles ()">gst_navigation_query_parse_angles</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstnavigation.html#gst-navigation-query-parse-commands-length" title="gst_navigation_query_parse_commands_length ()">gst_navigation_query_parse_commands_length</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstnavigation.html#gst-navigation-query-parse-commands-nth" title="gst_navigation_query_parse_commands_nth ()">gst_navigation_query_parse_commands_nth</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstnavigation.html#gst-navigation-query-set-angles" title="gst_navigation_query_set_angles ()">gst_navigation_query_set_angles</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstnavigation.html#gst-navigation-query-set-commands" title="gst_navigation_query_set_commands ()">gst_navigation_query_set_commands</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstnavigation.html#gst-navigation-query-set-commandsv" title="gst_navigation_query_set_commandsv ()">gst_navigation_query_set_commandsv</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<a name="GstNavigation"></a><div class="refsect1">
<a name="gst-plugins-base-libs-gstnavigation.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody>
<tr>
<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigation-struct" title="GstNavigation">GstNavigation</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigationInterface" title="struct GstNavigationInterface">GstNavigationInterface</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigationCommand" title="enum GstNavigationCommand">GstNavigationCommand</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigationEventType" title="enum GstNavigationEventType">GstNavigationEventType</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigationMessageType" title="enum GstNavigationMessageType">GstNavigationMessageType</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigationQueryType" title="enum GstNavigationQueryType">GstNavigationQueryType</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="gst-plugins-base-libs-gstnavigation.html#GST-NAVIGATION-COMMAND-DVD-ANGLE-MENU:CAPS" title="GST_NAVIGATION_COMMAND_DVD_ANGLE_MENU">GST_NAVIGATION_COMMAND_DVD_ANGLE_MENU</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="gst-plugins-base-libs-gstnavigation.html#GST-NAVIGATION-COMMAND-DVD-AUDIO-MENU:CAPS" title="GST_NAVIGATION_COMMAND_DVD_AUDIO_MENU">GST_NAVIGATION_COMMAND_DVD_AUDIO_MENU</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="gst-plugins-base-libs-gstnavigation.html#GST-NAVIGATION-COMMAND-DVD-CHAPTER-MENU:CAPS" title="GST_NAVIGATION_COMMAND_DVD_CHAPTER_MENU">GST_NAVIGATION_COMMAND_DVD_CHAPTER_MENU</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="gst-plugins-base-libs-gstnavigation.html#GST-NAVIGATION-COMMAND-DVD-MENU:CAPS" title="GST_NAVIGATION_COMMAND_DVD_MENU">GST_NAVIGATION_COMMAND_DVD_MENU</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="gst-plugins-base-libs-gstnavigation.html#GST-NAVIGATION-COMMAND-DVD-ROOT-MENU:CAPS" title="GST_NAVIGATION_COMMAND_DVD_ROOT_MENU">GST_NAVIGATION_COMMAND_DVD_ROOT_MENU</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="gst-plugins-base-libs-gstnavigation.html#GST-NAVIGATION-COMMAND-DVD-SUBPICTURE-MENU:CAPS" title="GST_NAVIGATION_COMMAND_DVD_SUBPICTURE_MENU">GST_NAVIGATION_COMMAND_DVD_SUBPICTURE_MENU</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="gst-plugins-base-libs-gstnavigation.html#GST-NAVIGATION-COMMAND-DVD-TITLE-MENU:CAPS" title="GST_NAVIGATION_COMMAND_DVD_TITLE_MENU">GST_NAVIGATION_COMMAND_DVD_TITLE_MENU</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstnavigation.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen">    GInterface
    <span class="lineart">╰──</span> GstNavigation
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstnavigation.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include &lt;gst/video/navigation.h&gt;
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstnavigation.description"></a><h2>Description</h2>
<p>The Navigation interface is used for creating and injecting navigation related
events such as mouse button presses, cursor motion and key presses. The associated
library also provides methods for parsing received events, and for sending and
receiving navigation related bus events. One main usecase is DVD menu navigation.</p>
<p>The main parts of the API are:</p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem"><p>
The GstNavigation interface, implemented by elements which provide an application
with the ability to create and inject navigation events into the pipeline.
</p></li>
<li class="listitem"><p>
GstNavigation event handling API. GstNavigation events are created in response to
calls on a GstNavigation interface implementation, and sent in the pipeline. Upstream
elements can use the navigation event API functions to parse the contents of received
messages.
</p></li>
<li class="listitem">
<p>
GstNavigation message handling API. GstNavigation messages may be sent on the message
bus to inform applications of navigation related changes in the pipeline, such as the
mouse moving over a clickable region, or the set of available angles changing.
</p>
<p>
The GstNavigation message functions provide functions for creating and parsing
custom bus messages for signaling GstNavigation changes.
</p>
</li>
</ul></div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstnavigation.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="gst-navigation-send-event"></a><h3>gst_navigation_send_event ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_navigation_send_event (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigation"><span class="type">GstNavigation</span></a> *navigation</code></em>,
                           <em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstStructure.html"><span class="type">GstStructure</span></a> *structure</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="gst-navigation-send-key-event"></a><h3>gst_navigation_send_key_event ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_navigation_send_key_event (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigation"><span class="type">GstNavigation</span></a> *navigation</code></em>,
                               <em class="parameter"><code>const <span class="type">char</span> *event</code></em>,
                               <em class="parameter"><code>const <span class="type">char</span> *key</code></em>);</pre>
<div class="refsect3">
<a name="id-1.2.15.21.9.3.4"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>navigation</p></td>
<td class="parameter_description"><p>The navigation interface instance</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>event</p></td>
<td class="parameter_description"><p>The type of the key event. Recognised values are "key-press" and
"key-release"</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>key</p></td>
<td class="parameter_description"><p>Character representation of the key. This is typically as produced
by XKeysymToString.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-navigation-send-mouse-event"></a><h3>gst_navigation_send_mouse_event ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_navigation_send_mouse_event (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigation"><span class="type">GstNavigation</span></a> *navigation</code></em>,
                                 <em class="parameter"><code>const <span class="type">char</span> *event</code></em>,
                                 <em class="parameter"><code><span class="type">int</span> button</code></em>,
                                 <em class="parameter"><code><span class="type">double</span> x</code></em>,
                                 <em class="parameter"><code><span class="type">double</span> y</code></em>);</pre>
<p>Sends a mouse event to the navigation interface. Mouse event coordinates
are sent relative to the display space of the related output area. This is
usually the size in pixels of the window associated with the element
implementing the <a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigation"><span class="type">GstNavigation</span></a> interface.</p>
<div class="refsect3">
<a name="id-1.2.15.21.9.4.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>navigation</p></td>
<td class="parameter_description"><p>The navigation interface instance</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>event</p></td>
<td class="parameter_description"><p>The type of mouse event, as a text string. Recognised values are
"mouse-button-press", "mouse-button-release" and "mouse-move".</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>button</p></td>
<td class="parameter_description"><p>The button number of the button being pressed or released. Pass 0
for mouse-move events.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>x</p></td>
<td class="parameter_description"><p>The x coordinate of the mouse event.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>y</p></td>
<td class="parameter_description"><p>The y coordinate of the mouse event.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-navigation-send-command"></a><h3>gst_navigation_send_command ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_navigation_send_command (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigation"><span class="type">GstNavigation</span></a> *navigation</code></em>,
                             <em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigationCommand" title="enum GstNavigationCommand"><span class="type">GstNavigationCommand</span></a> command</code></em>);</pre>
<p>Sends the indicated command to the navigation interface.</p>
<div class="refsect3">
<a name="id-1.2.15.21.9.5.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>navigation</p></td>
<td class="parameter_description"><p>The navigation interface instance</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>command</p></td>
<td class="parameter_description"><p>The command to issue</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-navigation-event-parse-command"></a><h3>gst_navigation_event_parse_command ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_navigation_event_parse_command (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstEvent.html"><span class="type">GstEvent</span></a> *event</code></em>,
                                    <em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigationCommand" title="enum GstNavigationCommand"><span class="type">GstNavigationCommand</span></a> *command</code></em>);</pre>
<p>Inspect a <a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigation"><span class="type">GstNavigation</span></a> command event and retrieve the enum value of the
associated command.</p>
<div class="refsect3">
<a name="id-1.2.15.21.9.6.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>event</p></td>
<td class="parameter_description"><p>A <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstEvent.html"><span class="type">GstEvent</span></a> to inspect.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>command</p></td>
<td class="parameter_description"><p>Pointer to GstNavigationCommand to receive the type of the
navigation event.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.15.21.9.6.6"></a><h4>Returns</h4>
<p> TRUE if the navigation command could be extracted, otherwise FALSE.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-navigation-event-parse-key-event"></a><h3>gst_navigation_event_parse_key_event ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_navigation_event_parse_key_event (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstEvent.html"><span class="type">GstEvent</span></a> *event</code></em>,
                                      <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> **key</code></em>);</pre>
<div class="refsect3">
<a name="id-1.2.15.21.9.7.4"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>event</p></td>
<td class="parameter_description"><p>A <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstEvent.html"><span class="type">GstEvent</span></a> to inspect.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>key</p></td>
<td class="parameter_description"><p>A pointer to a location to receive the string identifying the key
press. The returned string is owned by the event, and valid only until the
event is unreffed.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-navigation-event-parse-mouse-button-event"></a><h3>gst_navigation_event_parse_mouse_button_event ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_navigation_event_parse_mouse_button_event
                               (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstEvent.html"><span class="type">GstEvent</span></a> *event</code></em>,
                                <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> *button</code></em>,
                                <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *x</code></em>,
                                <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *y</code></em>);</pre>
<p>Retrieve the details of either a <a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigation"><span class="type">GstNavigation</span></a> mouse button press event or
a mouse button release event. Determine which type the event is using
<code class="function">gst_navigation_event_get_type()</code> to retrieve the <a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigationEventType" title="enum GstNavigationEventType"><span class="type">GstNavigationEventType</span></a>.</p>
<div class="refsect3">
<a name="id-1.2.15.21.9.8.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>event</p></td>
<td class="parameter_description"><p>A <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstEvent.html"><span class="type">GstEvent</span></a> to inspect.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>button</p></td>
<td class="parameter_description"><p>Pointer to a gint that will receive the button number associated
with the event.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>x</p></td>
<td class="parameter_description"><p>Pointer to a gdouble to receive the x coordinate of the mouse button
event.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>y</p></td>
<td class="parameter_description"><p>Pointer to a gdouble to receive the y coordinate of the mouse button
event.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.15.21.9.8.6"></a><h4>Returns</h4>
<p> TRUE if the button number and both coordinates could be extracted,
otherwise FALSE.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-navigation-event-parse-mouse-move-event"></a><h3>gst_navigation_event_parse_mouse_move_event ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_navigation_event_parse_mouse_move_event
                               (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstEvent.html"><span class="type">GstEvent</span></a> *event</code></em>,
                                <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *x</code></em>,
                                <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *y</code></em>);</pre>
<p>Inspect a <a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigation"><span class="type">GstNavigation</span></a> mouse movement event and extract the coordinates
of the event.</p>
<div class="refsect3">
<a name="id-1.2.15.21.9.9.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>event</p></td>
<td class="parameter_description"><p>A <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstEvent.html"><span class="type">GstEvent</span></a> to inspect.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>x</p></td>
<td class="parameter_description"><p>Pointer to a gdouble to receive the x coordinate of the mouse movement.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>y</p></td>
<td class="parameter_description"><p>Pointer to a gdouble to receive the y coordinate of the mouse movement.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.15.21.9.9.6"></a><h4>Returns</h4>
<p> TRUE if both coordinates could be extracted, otherwise FALSE.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-navigation-message-get-type"></a><h3>gst_navigation_message_get_type ()</h3>
<pre class="programlisting"><a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigationMessageType" title="enum GstNavigationMessageType"><span class="returnvalue">GstNavigationMessageType</span></a>
gst_navigation_message_get_type (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstMessage.html"><span class="type">GstMessage</span></a> *message</code></em>);</pre>
<p>Check a bus message to see if it is a <a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigation"><span class="type">GstNavigation</span></a> event, and return
the <a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigationMessageType" title="enum GstNavigationMessageType"><span class="type">GstNavigationMessageType</span></a> identifying the type of the message if so.</p>
<div class="refsect3">
<a name="id-1.2.15.21.9.10.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>message</p></td>
<td class="parameter_description"><p>A <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstMessage.html"><span class="type">GstMessage</span></a> to inspect.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.15.21.9.10.6"></a><h4>Returns</h4>
<p> The type of the <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstMessage.html"><span class="type">GstMessage</span></a>, or
<a class="link" href="gst-plugins-base-libs-gstnavigation.html#GST-NAVIGATION-MESSAGE-INVALID:CAPS"><span class="type">GST_NAVIGATION_MESSAGE_INVALID</span></a> if the message is not a <a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigation"><span class="type">GstNavigation</span></a>
notification.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-navigation-message-new-angles-changed"></a><h3>gst_navigation_message_new_angles_changed ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstMessage.html"><span class="returnvalue">GstMessage</span></a> *
gst_navigation_message_new_angles_changed
                               (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstObject.html"><span class="type">GstObject</span></a> *src</code></em>,
                                <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> cur_angle</code></em>,
                                <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> n_angles</code></em>);</pre>
<p>Creates a new <a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigation"><span class="type">GstNavigation</span></a> message with type
<a class="link" href="gst-plugins-base-libs-gstnavigation.html#GST-NAVIGATION-MESSAGE-ANGLES-CHANGED:CAPS"><span class="type">GST_NAVIGATION_MESSAGE_ANGLES_CHANGED</span></a> for notifying an application
that the current angle, or current number of angles available in a
multiangle video has changed.</p>
<div class="refsect3">
<a name="id-1.2.15.21.9.11.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>src</p></td>
<td class="parameter_description"><p>A <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstObject.html"><span class="type">GstObject</span></a> to set as source of the new message.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>cur_angle</p></td>
<td class="parameter_description"><p>The currently selected angle.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>n_angles</p></td>
<td class="parameter_description"><p>The number of viewing angles now available.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.15.21.9.11.6"></a><h4>Returns</h4>
<p> The new <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstMessage.html"><span class="type">GstMessage</span></a>.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-navigation-message-new-commands-changed"></a><h3>gst_navigation_message_new_commands_changed ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstMessage.html"><span class="returnvalue">GstMessage</span></a> *
gst_navigation_message_new_commands_changed
                               (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstObject.html"><span class="type">GstObject</span></a> *src</code></em>);</pre>
<p>Creates a new <a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigation"><span class="type">GstNavigation</span></a> message with type
<a class="link" href="gst-plugins-base-libs-gstnavigation.html#GST-NAVIGATION-MESSAGE-COMMANDS-CHANGED:CAPS"><span class="type">GST_NAVIGATION_MESSAGE_COMMANDS_CHANGED</span></a></p>
<div class="refsect3">
<a name="id-1.2.15.21.9.12.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>src</p></td>
<td class="parameter_description"><p>A <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstObject.html"><span class="type">GstObject</span></a> to set as source of the new message.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.15.21.9.12.6"></a><h4>Returns</h4>
<p> The new <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstMessage.html"><span class="type">GstMessage</span></a>.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-navigation-message-new-event"></a><h3>gst_navigation_message_new_event ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstMessage.html"><span class="returnvalue">GstMessage</span></a> *
gst_navigation_message_new_event (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstObject.html"><span class="type">GstObject</span></a> *src</code></em>,
                                  <em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstEvent.html"><span class="type">GstEvent</span></a> *event</code></em>);</pre>
<p>Creates a new <a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigation"><span class="type">GstNavigation</span></a> message with type
<a class="link" href="gst-plugins-base-libs-gstnavigation.html#GST-NAVIGATION-MESSAGE-EVENT:CAPS"><span class="type">GST_NAVIGATION_MESSAGE_EVENT</span></a>.</p>
<div class="refsect3">
<a name="id-1.2.15.21.9.13.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>src</p></td>
<td class="parameter_description"><p>A <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstObject.html"><span class="type">GstObject</span></a> to set as source of the new message.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>event</p></td>
<td class="parameter_description"><p> A navigation <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstEvent.html"><span class="type">GstEvent</span></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.15.21.9.13.6"></a><h4>Returns</h4>
<p> The new <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstMessage.html"><span class="type">GstMessage</span></a>.</p>
</div>
<p class="since">Since: 1.6</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-navigation-message-new-mouse-over"></a><h3>gst_navigation_message_new_mouse_over ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstMessage.html"><span class="returnvalue">GstMessage</span></a> *
gst_navigation_message_new_mouse_over (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstObject.html"><span class="type">GstObject</span></a> *src</code></em>,
                                       <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> active</code></em>);</pre>
<p>Creates a new <a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigation"><span class="type">GstNavigation</span></a> message with type
<a class="link" href="gst-plugins-base-libs-gstnavigation.html#GST-NAVIGATION-MESSAGE-MOUSE-OVER:CAPS"><span class="type">GST_NAVIGATION_MESSAGE_MOUSE_OVER</span></a>.</p>
<div class="refsect3">
<a name="id-1.2.15.21.9.14.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>src</p></td>
<td class="parameter_description"><p>A <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstObject.html"><span class="type">GstObject</span></a> to set as source of the new message.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>active</p></td>
<td class="parameter_description"><p><a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the mouse has entered a clickable area of the display.
<a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> if it over a non-clickable area.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.15.21.9.14.6"></a><h4>Returns</h4>
<p> The new <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstMessage.html"><span class="type">GstMessage</span></a>.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-navigation-message-parse-angles-changed"></a><h3>gst_navigation_message_parse_angles_changed ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_navigation_message_parse_angles_changed
                               (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstMessage.html"><span class="type">GstMessage</span></a> *message</code></em>,
                                <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> *cur_angle</code></em>,
                                <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> *n_angles</code></em>);</pre>
<p>Parse a <a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigation"><span class="type">GstNavigation</span></a> message of type GST_NAVIGATION_MESSAGE_ANGLES_CHANGED
and extract the <em class="parameter"><code>cur_angle</code></em>
 and <em class="parameter"><code>n_angles</code></em>
 parameters.</p>
<div class="refsect3">
<a name="id-1.2.15.21.9.15.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>message</p></td>
<td class="parameter_description"><p>A <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstMessage.html"><span class="type">GstMessage</span></a> to inspect.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>cur_angle</p></td>
<td class="parameter_description"><p>A pointer to a <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> to receive the new current angle number,
or NULL</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>n_angles</p></td>
<td class="parameter_description"><p>A pointer to a <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> to receive the new angle count, or NULL.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.15.21.9.15.6"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the message could be successfully parsed. <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> if not.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-navigation-message-parse-event"></a><h3>gst_navigation_message_parse_event ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_navigation_message_parse_event (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstMessage.html"><span class="type">GstMessage</span></a> *message</code></em>,
                                    <em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstEvent.html"><span class="type">GstEvent</span></a> **event</code></em>);</pre>
<p>Parse a <a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigation"><span class="type">GstNavigation</span></a> message of type <a class="link" href="gst-plugins-base-libs-gstnavigation.html#GST-NAVIGATION-MESSAGE-EVENT:CAPS"><span class="type">GST_NAVIGATION_MESSAGE_EVENT</span></a>
and extract contained <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstEvent.html"><span class="type">GstEvent</span></a>. The caller must unref the <em class="parameter"><code>event</code></em>
 when done
with it.</p>
<div class="refsect3">
<a name="id-1.2.15.21.9.16.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>message</p></td>
<td class="parameter_description"><p>A <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstMessage.html"><span class="type">GstMessage</span></a> to inspect.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>event</p></td>
<td class="parameter_description"><p> a pointer to a <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstEvent.html"><span class="type">GstEvent</span></a> to receive the
contained navigation event. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.15.21.9.16.6"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the message could be successfully parsed. <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> if not.</p>
</div>
<p class="since">Since: 1.6</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-navigation-message-parse-mouse-over"></a><h3>gst_navigation_message_parse_mouse_over ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_navigation_message_parse_mouse_over
                               (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstMessage.html"><span class="type">GstMessage</span></a> *message</code></em>,
                                <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> *active</code></em>);</pre>
<p>Parse a <a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigation"><span class="type">GstNavigation</span></a> message of type <a class="link" href="gst-plugins-base-libs-gstnavigation.html#GST-NAVIGATION-MESSAGE-MOUSE-OVER:CAPS"><span class="type">GST_NAVIGATION_MESSAGE_MOUSE_OVER</span></a>
and extract the active/inactive flag. If the mouse over event is marked
active, it indicates that the mouse is over a clickable area.</p>
<div class="refsect3">
<a name="id-1.2.15.21.9.17.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>message</p></td>
<td class="parameter_description"><p>A <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstMessage.html"><span class="type">GstMessage</span></a> to inspect.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>active</p></td>
<td class="parameter_description"><p>A pointer to a gboolean to receive the active/inactive state,
or NULL.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.15.21.9.17.6"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the message could be successfully parsed. <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> if not.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-navigation-query-new-angles"></a><h3>gst_navigation_query_new_angles ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstQuery.html"><span class="returnvalue">GstQuery</span></a> *
gst_navigation_query_new_angles (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>Create a new <a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigation"><span class="type">GstNavigation</span></a> angles query. When executed, it will
query the pipeline for the set of currently available angles, which may be
greater than one in a multiangle video.</p>
<div class="refsect3">
<a name="id-1.2.15.21.9.18.5"></a><h4>Returns</h4>
<p> The new query.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-navigation-query-get-type"></a><h3>gst_navigation_query_get_type ()</h3>
<pre class="programlisting"><a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigationQueryType" title="enum GstNavigationQueryType"><span class="returnvalue">GstNavigationQueryType</span></a>
gst_navigation_query_get_type (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstQuery.html"><span class="type">GstQuery</span></a> *query</code></em>);</pre>
<p>Inspect a <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstQuery.html"><span class="type">GstQuery</span></a> and return the <a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigationQueryType" title="enum GstNavigationQueryType"><span class="type">GstNavigationQueryType</span></a> associated with
it if it is a <a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigation"><span class="type">GstNavigation</span></a> query.</p>
<div class="refsect3">
<a name="id-1.2.15.21.9.19.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>query</p></td>
<td class="parameter_description"><p>The query to inspect</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.15.21.9.19.6"></a><h4>Returns</h4>
<p> The <a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigationQueryType" title="enum GstNavigationQueryType"><span class="type">GstNavigationQueryType</span></a> of the query, or
<a class="link" href="gst-plugins-base-libs-gstnavigation.html#GST-NAVIGATION-QUERY-INVALID:CAPS"><span class="type">GST_NAVIGATION_QUERY_INVALID</span></a></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-navigation-query-new-commands"></a><h3>gst_navigation_query_new_commands ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstQuery.html"><span class="returnvalue">GstQuery</span></a> *
gst_navigation_query_new_commands (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>Create a new <a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigation"><span class="type">GstNavigation</span></a> commands query. When executed, it will
query the pipeline for the set of currently available commands.</p>
<div class="refsect3">
<a name="id-1.2.15.21.9.20.5"></a><h4>Returns</h4>
<p> The new query.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-navigation-query-parse-angles"></a><h3>gst_navigation_query_parse_angles ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_navigation_query_parse_angles (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstQuery.html"><span class="type">GstQuery</span></a> *query</code></em>,
                                   <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> *cur_angle</code></em>,
                                   <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> *n_angles</code></em>);</pre>
<p>Parse the current angle number in the <a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigation"><span class="type">GstNavigation</span></a> angles <em class="parameter"><code>query</code></em>
 into the
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> pointed to by the <em class="parameter"><code>cur_angle</code></em>
 variable, and the number of available
angles into the <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> pointed to by the <em class="parameter"><code>n_angles</code></em>
 variable.</p>
<div class="refsect3">
<a name="id-1.2.15.21.9.21.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>query</p></td>
<td class="parameter_description"><p>a <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstQuery.html"><span class="type">GstQuery</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>cur_angle</p></td>
<td class="parameter_description"><p>Pointer to a <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> into which to store the currently selected
angle value from the query, or NULL</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>n_angles</p></td>
<td class="parameter_description"><p>Pointer to a <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> into which to store the number of angles
value from the query, or NULL</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.15.21.9.21.6"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the query could be successfully parsed. <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> if not.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-navigation-query-parse-commands-length"></a><h3>gst_navigation_query_parse_commands_length ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_navigation_query_parse_commands_length
                               (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstQuery.html"><span class="type">GstQuery</span></a> *query</code></em>,
                                <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> *n_cmds</code></em>);</pre>
<p>Parse the number of commands in the <a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigation"><span class="type">GstNavigation</span></a> commands <em class="parameter"><code>query</code></em>
.</p>
<div class="refsect3">
<a name="id-1.2.15.21.9.22.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>query</p></td>
<td class="parameter_description"><p>a <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstQuery.html"><span class="type">GstQuery</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>n_cmds</p></td>
<td class="parameter_description"><p> the number of commands in this query. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.15.21.9.22.6"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the query could be successfully parsed. <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> if not.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-navigation-query-parse-commands-nth"></a><h3>gst_navigation_query_parse_commands_nth ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_navigation_query_parse_commands_nth
                               (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstQuery.html"><span class="type">GstQuery</span></a> *query</code></em>,
                                <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> nth</code></em>,
                                <em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigationCommand" title="enum GstNavigationCommand"><span class="type">GstNavigationCommand</span></a> *cmd</code></em>);</pre>
<p>Parse the <a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigation"><span class="type">GstNavigation</span></a> command query and retrieve the <em class="parameter"><code>nth</code></em>
 command from
it into <em class="parameter"><code>cmd</code></em>
. If the list contains less elements than <em class="parameter"><code>nth</code></em>
, <em class="parameter"><code>cmd</code></em>
 will be
set to <a class="link" href="gst-plugins-base-libs-gstnavigation.html#GST-NAVIGATION-COMMAND-INVALID:CAPS"><span class="type">GST_NAVIGATION_COMMAND_INVALID</span></a>.</p>
<div class="refsect3">
<a name="id-1.2.15.21.9.23.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>query</p></td>
<td class="parameter_description"><p>a <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstQuery.html"><span class="type">GstQuery</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>nth</p></td>
<td class="parameter_description"><p>the nth command to retrieve.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>cmd</p></td>
<td class="parameter_description"><p> a pointer to store the nth command into. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.15.21.9.23.6"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the query could be successfully parsed. <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> if not.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-navigation-query-set-angles"></a><h3>gst_navigation_query_set_angles ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_navigation_query_set_angles (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstQuery.html"><span class="type">GstQuery</span></a> *query</code></em>,
                                 <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> cur_angle</code></em>,
                                 <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> n_angles</code></em>);</pre>
<p>Set the <a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigation"><span class="type">GstNavigation</span></a> angles query result field in <em class="parameter"><code>query</code></em>
.</p>
<div class="refsect3">
<a name="id-1.2.15.21.9.24.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>query</p></td>
<td class="parameter_description"><p>a <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstQuery.html"><span class="type">GstQuery</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>cur_angle</p></td>
<td class="parameter_description"><p>the current viewing angle to set.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>n_angles</p></td>
<td class="parameter_description"><p>the number of viewing angles to set.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-navigation-query-set-commands"></a><h3>gst_navigation_query_set_commands ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_navigation_query_set_commands (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstQuery.html"><span class="type">GstQuery</span></a> *query</code></em>,
                                   <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> n_cmds</code></em>,
                                   <em class="parameter"><code>...</code></em>);</pre>
<p>Set the <a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigation"><span class="type">GstNavigation</span></a> command query result fields in <em class="parameter"><code>query</code></em>
. The number
of commands passed must be equal to <em class="parameter"><code>n_commands</code></em>
.</p>
<div class="refsect3">
<a name="id-1.2.15.21.9.25.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>query</p></td>
<td class="parameter_description"><p>a <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstQuery.html"><span class="type">GstQuery</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>n_cmds</p></td>
<td class="parameter_description"><p>the number of commands to set.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>...</p></td>
<td class="parameter_description"><p>A list of <em class="parameter"><code>GstNavigationCommand</code></em>
values, <em class="parameter"><code>n_cmds</code></em>
entries long.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-navigation-query-set-commandsv"></a><h3>gst_navigation_query_set_commandsv ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_navigation_query_set_commandsv (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstQuery.html"><span class="type">GstQuery</span></a> *query</code></em>,
                                    <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> n_cmds</code></em>,
                                    <em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigationCommand" title="enum GstNavigationCommand"><span class="type">GstNavigationCommand</span></a> *cmds</code></em>);</pre>
<p>Set the <a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigation"><span class="type">GstNavigation</span></a> command query result fields in <em class="parameter"><code>query</code></em>
. The number
of commands passed must be equal to <em class="parameter"><code>n_commands</code></em>
.</p>
<div class="refsect3">
<a name="id-1.2.15.21.9.26.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>query</p></td>
<td class="parameter_description"><p>a <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstQuery.html"><span class="type">GstQuery</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>n_cmds</p></td>
<td class="parameter_description"><p>the number of commands to set.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>cmds</p></td>
<td class="parameter_description"><p>An array containing <em class="parameter"><code>n_cmds</code></em>
<em class="parameter"><code>GstNavigationCommand</code></em>
values.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstnavigation.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GstNavigation-struct"></a><h3>GstNavigation</h3>
<pre class="programlisting">typedef struct _GstNavigation GstNavigation;</pre>
</div>
<hr>
<div class="refsect2">
<a name="GstNavigationInterface"></a><h3>struct GstNavigationInterface</h3>
<pre class="programlisting">struct GstNavigationInterface {
  GTypeInterface iface;

  /* virtual functions */
  void (*send_event) (GstNavigation *navigation, GstStructure *structure);
};
</pre>
<p>Navigation interface.</p>
<div class="refsect3">
<a name="id-1.2.15.21.10.3.5"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="struct_members_name">
<col class="struct_members_description">
<col width="200px" class="struct_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/gobject/gobject-Type-Information.html#GTypeInterface"><span class="type">GTypeInterface</span></a> <em class="structfield"><code><a name="GstNavigationInterface.iface"></a>iface</code></em>;</p></td>
<td class="struct_member_description"><p>the parent interface</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstNavigationInterface.send-event"></a>send_event</code></em> ()</p></td>
<td class="struct_member_description"><p>sending a navigation event</p></td>
<td class="struct_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GstNavigationCommand"></a><h3>enum GstNavigationCommand</h3>
<p>A set of commands that may be issued to an element providing the
<a class="link" href="gst-plugins-base-libs-gstnavigation.html#GstNavigation"><span class="type">GstNavigation</span></a> interface. The available commands can be queried via
the <a class="link" href="gst-plugins-base-libs-gstnavigation.html#gst-navigation-query-new-commands" title="gst_navigation_query_new_commands ()"><code class="function">gst_navigation_query_new_commands()</code></a> query.</p>
<p>For convenience in handling DVD navigation, the MENU commands are aliased as:
   GST_NAVIGATION_COMMAND_DVD_MENU            = <em class="parameter"><code>GST_NAVIGATION_COMMAND_MENU1</code></em>

   GST_NAVIGATION_COMMAND_DVD_TITLE_MENU      = <em class="parameter"><code>GST_NAVIGATION_COMMAND_MENU2</code></em>

   GST_NAVIGATION_COMMAND_DVD_ROOT_MENU       = <em class="parameter"><code>GST_NAVIGATION_COMMAND_MENU3</code></em>

   GST_NAVIGATION_COMMAND_DVD_SUBPICTURE_MENU = <em class="parameter"><code>GST_NAVIGATION_COMMAND_MENU4</code></em>

   GST_NAVIGATION_COMMAND_DVD_AUDIO_MENU      = <em class="parameter"><code>GST_NAVIGATION_COMMAND_MENU5</code></em>

   GST_NAVIGATION_COMMAND_DVD_ANGLE_MENU      = <em class="parameter"><code>GST_NAVIGATION_COMMAND_MENU6</code></em>

   GST_NAVIGATION_COMMAND_DVD_CHAPTER_MENU    = <em class="parameter"><code>GST_NAVIGATION_COMMAND_MENU7</code></em>
</p>
<div class="refsect3">
<a name="id-1.2.15.21.10.4.5"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="enum_members_name">
<col class="enum_members_description">
<col width="200px" class="enum_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="enum_member_name"><p><a name="GST-NAVIGATION-COMMAND-INVALID:CAPS"></a>GST_NAVIGATION_COMMAND_INVALID</p></td>
<td class="enum_member_description">
<p>An invalid command entry</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-NAVIGATION-COMMAND-MENU1:CAPS"></a>GST_NAVIGATION_COMMAND_MENU1</p></td>
<td class="enum_member_description">
<p>Execute navigation menu command 1. For DVD,
this enters the DVD root menu, or exits back to the title from the menu.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-NAVIGATION-COMMAND-MENU2:CAPS"></a>GST_NAVIGATION_COMMAND_MENU2</p></td>
<td class="enum_member_description">
<p>Execute navigation menu command 2. For DVD,
this jumps to the DVD title menu.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-NAVIGATION-COMMAND-MENU3:CAPS"></a>GST_NAVIGATION_COMMAND_MENU3</p></td>
<td class="enum_member_description">
<p>Execute navigation menu command 3. For DVD,
this jumps into the DVD root menu.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-NAVIGATION-COMMAND-MENU4:CAPS"></a>GST_NAVIGATION_COMMAND_MENU4</p></td>
<td class="enum_member_description">
<p>Execute navigation menu command 4. For DVD,
this jumps to the Subpicture menu.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-NAVIGATION-COMMAND-MENU5:CAPS"></a>GST_NAVIGATION_COMMAND_MENU5</p></td>
<td class="enum_member_description">
<p>Execute navigation menu command 5. For DVD,
the jumps to the audio menu.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-NAVIGATION-COMMAND-MENU6:CAPS"></a>GST_NAVIGATION_COMMAND_MENU6</p></td>
<td class="enum_member_description">
<p>Execute navigation menu command 6. For DVD,
this jumps to the angles menu.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-NAVIGATION-COMMAND-MENU7:CAPS"></a>GST_NAVIGATION_COMMAND_MENU7</p></td>
<td class="enum_member_description">
<p>Execute navigation menu command 7. For DVD,
this jumps to the chapter menu.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-NAVIGATION-COMMAND-LEFT:CAPS"></a>GST_NAVIGATION_COMMAND_LEFT</p></td>
<td class="enum_member_description">
<p>Select the next button to the left in a menu,
if such a button exists.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-NAVIGATION-COMMAND-RIGHT:CAPS"></a>GST_NAVIGATION_COMMAND_RIGHT</p></td>
<td class="enum_member_description">
<p>Select the next button to the right in a menu,
if such a button exists.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-NAVIGATION-COMMAND-UP:CAPS"></a>GST_NAVIGATION_COMMAND_UP</p></td>
<td class="enum_member_description">
<p>Select the button above the current one in a
menu, if such a button exists.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-NAVIGATION-COMMAND-DOWN:CAPS"></a>GST_NAVIGATION_COMMAND_DOWN</p></td>
<td class="enum_member_description">
<p>Select the button below the current one in a
menu, if such a button exists.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-NAVIGATION-COMMAND-ACTIVATE:CAPS"></a>GST_NAVIGATION_COMMAND_ACTIVATE</p></td>
<td class="enum_member_description">
<p>Activate (click) the currently selected
button in a menu, if such a button exists.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-NAVIGATION-COMMAND-PREV-ANGLE:CAPS"></a>GST_NAVIGATION_COMMAND_PREV_ANGLE</p></td>
<td class="enum_member_description">
<p>Switch to the previous angle in a
multiangle feature.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-NAVIGATION-COMMAND-NEXT-ANGLE:CAPS"></a>GST_NAVIGATION_COMMAND_NEXT_ANGLE</p></td>
<td class="enum_member_description">
<p>Switch to the next angle in a multiangle
feature.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GstNavigationEventType"></a><h3>enum GstNavigationEventType</h3>
<p>Enum values for the various events that an element implementing the
GstNavigation interface might send up the pipeline.</p>
<div class="refsect3">
<a name="id-1.2.15.21.10.5.4"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="enum_members_name">
<col class="enum_members_description">
<col width="200px" class="enum_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="enum_member_name"><p><a name="GST-NAVIGATION-EVENT-INVALID:CAPS"></a>GST_NAVIGATION_EVENT_INVALID</p></td>
<td class="enum_member_description">
<p>Returned from
<code class="function">gst_navigation_event_get_type()</code> when the passed event is not a navigation event.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-NAVIGATION-EVENT-KEY-PRESS:CAPS"></a>GST_NAVIGATION_EVENT_KEY_PRESS</p></td>
<td class="enum_member_description">
<p>A key press event. Use
<a class="link" href="gst-plugins-base-libs-gstnavigation.html#gst-navigation-event-parse-key-event" title="gst_navigation_event_parse_key_event ()"><code class="function">gst_navigation_event_parse_key_event()</code></a> to extract the details from the event.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-NAVIGATION-EVENT-KEY-RELEASE:CAPS"></a>GST_NAVIGATION_EVENT_KEY_RELEASE</p></td>
<td class="enum_member_description">
<p>A key release event. Use
<a class="link" href="gst-plugins-base-libs-gstnavigation.html#gst-navigation-event-parse-key-event" title="gst_navigation_event_parse_key_event ()"><code class="function">gst_navigation_event_parse_key_event()</code></a> to extract the details from the event.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-NAVIGATION-EVENT-MOUSE-BUTTON-PRESS:CAPS"></a>GST_NAVIGATION_EVENT_MOUSE_BUTTON_PRESS</p></td>
<td class="enum_member_description">
<p>A mouse button press event. Use
<a class="link" href="gst-plugins-base-libs-gstnavigation.html#gst-navigation-event-parse-mouse-button-event" title="gst_navigation_event_parse_mouse_button_event ()"><code class="function">gst_navigation_event_parse_mouse_button_event()</code></a> to extract the details from the
event.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-NAVIGATION-EVENT-MOUSE-BUTTON-RELEASE:CAPS"></a>GST_NAVIGATION_EVENT_MOUSE_BUTTON_RELEASE</p></td>
<td class="enum_member_description">
<p>A mouse button release event. Use
<a class="link" href="gst-plugins-base-libs-gstnavigation.html#gst-navigation-event-parse-mouse-button-event" title="gst_navigation_event_parse_mouse_button_event ()"><code class="function">gst_navigation_event_parse_mouse_button_event()</code></a> to extract the details from the
event.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-NAVIGATION-EVENT-MOUSE-MOVE:CAPS"></a>GST_NAVIGATION_EVENT_MOUSE_MOVE</p></td>
<td class="enum_member_description">
<p>A mouse movement event. Use
<a class="link" href="gst-plugins-base-libs-gstnavigation.html#gst-navigation-event-parse-mouse-move-event" title="gst_navigation_event_parse_mouse_move_event ()"><code class="function">gst_navigation_event_parse_mouse_move_event()</code></a> to extract the details from the
event.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-NAVIGATION-EVENT-COMMAND:CAPS"></a>GST_NAVIGATION_EVENT_COMMAND</p></td>
<td class="enum_member_description">
<p>A navigation command event. Use
<a class="link" href="gst-plugins-base-libs-gstnavigation.html#gst-navigation-event-parse-command" title="gst_navigation_event_parse_command ()"><code class="function">gst_navigation_event_parse_command()</code></a> to extract the details from the event.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GstNavigationMessageType"></a><h3>enum GstNavigationMessageType</h3>
<p>A set of notifications that may be received on the bus when navigation
related status changes.</p>
<div class="refsect3">
<a name="id-1.2.15.21.10.6.4"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="enum_members_name">
<col class="enum_members_description">
<col width="200px" class="enum_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="enum_member_name"><p><a name="GST-NAVIGATION-MESSAGE-INVALID:CAPS"></a>GST_NAVIGATION_MESSAGE_INVALID</p></td>
<td class="enum_member_description">
<p>Returned from
<a class="link" href="gst-plugins-base-libs-gstnavigation.html#gst-navigation-message-get-type" title="gst_navigation_message_get_type ()"><code class="function">gst_navigation_message_get_type()</code></a> when the passed message is not a
navigation message.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-NAVIGATION-MESSAGE-MOUSE-OVER:CAPS"></a>GST_NAVIGATION_MESSAGE_MOUSE_OVER</p></td>
<td class="enum_member_description">
<p>Sent when the mouse moves over or leaves a
clickable region of the output, such as a DVD menu button.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-NAVIGATION-MESSAGE-COMMANDS-CHANGED:CAPS"></a>GST_NAVIGATION_MESSAGE_COMMANDS_CHANGED</p></td>
<td class="enum_member_description">
<p>Sent when the set of available commands
changes and should re-queried by interested applications.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-NAVIGATION-MESSAGE-ANGLES-CHANGED:CAPS"></a>GST_NAVIGATION_MESSAGE_ANGLES_CHANGED</p></td>
<td class="enum_member_description">
<p>Sent when display angles in a multi-angle
feature (such as a multiangle DVD) change - either angles have appeared or
disappeared.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-NAVIGATION-MESSAGE-EVENT:CAPS"></a>GST_NAVIGATION_MESSAGE_EVENT</p></td>
<td class="enum_member_description">
<p>Sent when a navigation event was not handled
by any element in the pipeline (Since 1.6)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GstNavigationQueryType"></a><h3>enum GstNavigationQueryType</h3>
<p>Tyoes of navigation interface queries.</p>
<div class="refsect3">
<a name="id-1.2.15.21.10.7.4"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="enum_members_name">
<col class="enum_members_description">
<col width="200px" class="enum_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="enum_member_name"><p><a name="GST-NAVIGATION-QUERY-INVALID:CAPS"></a>GST_NAVIGATION_QUERY_INVALID</p></td>
<td class="enum_member_description">
<p>invalid query</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-NAVIGATION-QUERY-COMMANDS:CAPS"></a>GST_NAVIGATION_QUERY_COMMANDS</p></td>
<td class="enum_member_description">
<p>command query</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-NAVIGATION-QUERY-ANGLES:CAPS"></a>GST_NAVIGATION_QUERY_ANGLES</p></td>
<td class="enum_member_description">
<p>viewing angle query</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GST-NAVIGATION-COMMAND-DVD-ANGLE-MENU:CAPS"></a><h3>GST_NAVIGATION_COMMAND_DVD_ANGLE_MENU</h3>
<pre class="programlisting">#define GST_NAVIGATION_COMMAND_DVD_ANGLE_MENU      GST_NAVIGATION_COMMAND_MENU6
</pre>
</div>
<hr>
<div class="refsect2">
<a name="GST-NAVIGATION-COMMAND-DVD-AUDIO-MENU:CAPS"></a><h3>GST_NAVIGATION_COMMAND_DVD_AUDIO_MENU</h3>
<pre class="programlisting">#define GST_NAVIGATION_COMMAND_DVD_AUDIO_MENU      GST_NAVIGATION_COMMAND_MENU5
</pre>
</div>
<hr>
<div class="refsect2">
<a name="GST-NAVIGATION-COMMAND-DVD-CHAPTER-MENU:CAPS"></a><h3>GST_NAVIGATION_COMMAND_DVD_CHAPTER_MENU</h3>
<pre class="programlisting">#define GST_NAVIGATION_COMMAND_DVD_CHAPTER_MENU    GST_NAVIGATION_COMMAND_MENU7
</pre>
</div>
<hr>
<div class="refsect2">
<a name="GST-NAVIGATION-COMMAND-DVD-MENU:CAPS"></a><h3>GST_NAVIGATION_COMMAND_DVD_MENU</h3>
<pre class="programlisting">#define GST_NAVIGATION_COMMAND_DVD_MENU            GST_NAVIGATION_COMMAND_MENU1
</pre>
</div>
<hr>
<div class="refsect2">
<a name="GST-NAVIGATION-COMMAND-DVD-ROOT-MENU:CAPS"></a><h3>GST_NAVIGATION_COMMAND_DVD_ROOT_MENU</h3>
<pre class="programlisting">#define GST_NAVIGATION_COMMAND_DVD_ROOT_MENU       GST_NAVIGATION_COMMAND_MENU3
</pre>
</div>
<hr>
<div class="refsect2">
<a name="GST-NAVIGATION-COMMAND-DVD-SUBPICTURE-MENU:CAPS"></a><h3>GST_NAVIGATION_COMMAND_DVD_SUBPICTURE_MENU</h3>
<pre class="programlisting">#define GST_NAVIGATION_COMMAND_DVD_SUBPICTURE_MENU GST_NAVIGATION_COMMAND_MENU4
</pre>
</div>
<hr>
<div class="refsect2">
<a name="GST-NAVIGATION-COMMAND-DVD-TITLE-MENU:CAPS"></a><h3>GST_NAVIGATION_COMMAND_DVD_TITLE_MENU</h3>
<pre class="programlisting">#define GST_NAVIGATION_COMMAND_DVD_TITLE_MENU      GST_NAVIGATION_COMMAND_MENU2
</pre>
</div>
</div>
</div>
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