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|
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<a href="#GstPadTemplate.synopsis" class="shortcut">Top</a>
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<a href="#GstPadTemplate.description" class="shortcut">Description</a>
|
<a href="#GstPadTemplate.object-hierarchy" class="shortcut">Object Hierarchy</a>
|
<a href="#GstPadTemplate.properties" class="shortcut">Properties</a>
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<a href="#GstPadTemplate.signals" class="shortcut">Signals</a>
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<div class="refentry">
<a name="GstPadTemplate"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="GstPadTemplate.top_of_page"></a>GstPadTemplate</span></h2>
<p>GstPadTemplate — Describe the media type of a pad.</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="GstPadTemplate.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include <gst/gst.h>
struct <a class="link" href="GstPadTemplate.html#GstStaticPadTemplate" title="struct GstStaticPadTemplate">GstStaticPadTemplate</a>;
#define <a class="link" href="GstPadTemplate.html#GST-STATIC-PAD-TEMPLATE:CAPS" title="GST_STATIC_PAD_TEMPLATE()">GST_STATIC_PAD_TEMPLATE</a> (padname,
dir,
pres,
caps)
<a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="returnvalue">GstPadTemplate</span></a> * <a class="link" href="GstPadTemplate.html#gst-static-pad-template-get" title="gst_static_pad_template_get ()">gst_static_pad_template_get</a> (<em class="parameter"><code><a class="link" href="GstPadTemplate.html#GstStaticPadTemplate" title="struct GstStaticPadTemplate"><span class="type">GstStaticPadTemplate</span></a> *pad_template</code></em>);
<a class="link" href="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="returnvalue">GstCaps</span></a> * <a class="link" href="GstPadTemplate.html#gst-static-pad-template-get-caps" title="gst_static_pad_template_get_caps ()">gst_static_pad_template_get_caps</a> (<em class="parameter"><code><a class="link" href="GstPadTemplate.html#GstStaticPadTemplate" title="struct GstStaticPadTemplate"><span class="type">GstStaticPadTemplate</span></a> *templ</code></em>);
struct <a class="link" href="GstPadTemplate.html#GstPadTemplate-struct" title="struct GstPadTemplate">GstPadTemplate</a>;
enum <a class="link" href="GstPadTemplate.html#GstPadTemplateFlags" title="enum GstPadTemplateFlags">GstPadTemplateFlags</a>;
enum <a class="link" href="GstPadTemplate.html#GstPadPresence" title="enum GstPadPresence">GstPadPresence</a>;
#define <a class="link" href="GstPadTemplate.html#GST-PAD-TEMPLATE-NAME-TEMPLATE:CAPS" title="GST_PAD_TEMPLATE_NAME_TEMPLATE()">GST_PAD_TEMPLATE_NAME_TEMPLATE</a> (templ)
#define <a class="link" href="GstPadTemplate.html#GST-PAD-TEMPLATE-DIRECTION:CAPS" title="GST_PAD_TEMPLATE_DIRECTION()">GST_PAD_TEMPLATE_DIRECTION</a> (templ)
#define <a class="link" href="GstPadTemplate.html#GST-PAD-TEMPLATE-PRESENCE:CAPS" title="GST_PAD_TEMPLATE_PRESENCE()">GST_PAD_TEMPLATE_PRESENCE</a> (templ)
#define <a class="link" href="GstPadTemplate.html#GST-PAD-TEMPLATE-CAPS" title="GST_PAD_TEMPLATE_CAPS()">GST_PAD_TEMPLATE_CAPS</a> (templ)
#define <a class="link" href="GstPadTemplate.html#GST-PAD-TEMPLATE-IS-FIXED:CAPS" title="GST_PAD_TEMPLATE_IS_FIXED()">GST_PAD_TEMPLATE_IS_FIXED</a> (templ)
<a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="returnvalue">GstPadTemplate</span></a> * <a class="link" href="GstPadTemplate.html#gst-pad-template-new" title="gst_pad_template_new ()">gst_pad_template_new</a> (<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name_template</code></em>,
<em class="parameter"><code><a class="link" href="GstPad.html#GstPadDirection" title="enum GstPadDirection"><span class="type">GstPadDirection</span></a> direction</code></em>,
<em class="parameter"><code><a class="link" href="GstPadTemplate.html#GstPadPresence" title="enum GstPadPresence"><span class="type">GstPadPresence</span></a> presence</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="type">GstCaps</span></a> *caps</code></em>);
<a class="link" href="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="returnvalue">GstCaps</span></a> * <a class="link" href="GstPadTemplate.html#gst-pad-template-get-caps" title="gst_pad_template_get_caps ()">gst_pad_template_get_caps</a> (<em class="parameter"><code><a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="type">GstPadTemplate</span></a> *templ</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="GstPadTemplate.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="synopsis">
<a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GObject">GObject</a>
+----<a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GInitiallyUnowned">GInitiallyUnowned</a>
+----<a class="link" href="GstObject.html" title="GstObject">GstObject</a>
+----GstPadTemplate
</pre>
</div>
<div class="refsect1">
<a name="GstPadTemplate.properties"></a><h2>Properties</h2>
<pre class="synopsis">
"<a class="link" href="GstPadTemplate.html#GstPadTemplate--caps" title='The "caps" property'>caps</a>" <a class="link" href="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="type">GstCaps</span></a>* : Read / Write / Construct Only
"<a class="link" href="GstPadTemplate.html#GstPadTemplate--direction" title='The "direction" property'>direction</a>" <a class="link" href="GstPad.html#GstPadDirection" title="enum GstPadDirection"><span class="type">GstPadDirection</span></a> : Read / Write / Construct Only
"<a class="link" href="GstPadTemplate.html#GstPadTemplate--name-template" title='The "name-template" property'>name-template</a>" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a>* : Read / Write / Construct Only
"<a class="link" href="GstPadTemplate.html#GstPadTemplate--presence" title='The "presence" property'>presence</a>" <a class="link" href="GstPadTemplate.html#GstPadPresence" title="enum GstPadPresence"><span class="type">GstPadPresence</span></a> : Read / Write / Construct Only
</pre>
</div>
<div class="refsect1">
<a name="GstPadTemplate.signals"></a><h2>Signals</h2>
<pre class="synopsis">
"<a class="link" href="GstPadTemplate.html#GstPadTemplate-pad-created" title='The "pad-created" signal'>pad-created</a>" : <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS"><code class="literal">Run Last</code></a>
</pre>
</div>
<div class="refsect1">
<a name="GstPadTemplate.description"></a><h2>Description</h2>
<p>
Padtemplates describe the possible media types a pad or an elementfactory can
handle. This allows for both inspection of handled types before loading the
element plugin as well as identifying pads on elements that are not yet
created (request or sometimes pads).
</p>
<p>
Pad and PadTemplates have <a class="link" href="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="type">GstCaps</span></a> attached to it to describe the media type
they are capable of dealing with. <a class="link" href="GstPadTemplate.html#gst-pad-template-get-caps" title="gst_pad_template_get_caps ()"><code class="function">gst_pad_template_get_caps()</code></a> or
<a class="link" href="GstPadTemplate.html#GST-PAD-TEMPLATE-CAPS" title="GST_PAD_TEMPLATE_CAPS()"><code class="function">GST_PAD_TEMPLATE_CAPS()</code></a> are used to get the caps of a padtemplate. It's not
possible to modify the caps of a padtemplate after creation.
</p>
<p>
PadTemplates have a <a class="link" href="GstPadTemplate.html#GstPadPresence" title="enum GstPadPresence"><span class="type">GstPadPresence</span></a> property which identifies the lifetime
of the pad and that can be retrieved with <a class="link" href="GstPadTemplate.html#GST-PAD-TEMPLATE-PRESENCE:CAPS" title="GST_PAD_TEMPLATE_PRESENCE()"><code class="function">GST_PAD_TEMPLATE_PRESENCE()</code></a>. Also
the direction of the pad can be retrieved from the <a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="type">GstPadTemplate</span></a> with
<a class="link" href="GstPadTemplate.html#GST-PAD-TEMPLATE-DIRECTION:CAPS" title="GST_PAD_TEMPLATE_DIRECTION()"><code class="function">GST_PAD_TEMPLATE_DIRECTION()</code></a>.
</p>
<p>
The <a class="link" href="GstPadTemplate.html#GST-PAD-TEMPLATE-NAME-TEMPLATE:CAPS" title="GST_PAD_TEMPLATE_NAME_TEMPLATE()"><code class="function">GST_PAD_TEMPLATE_NAME_TEMPLATE()</code></a> is important for GST_PAD_REQUEST pads
because it has to be used as the name in the <a class="link" href="GstElement.html#gst-element-get-request-pad" title="gst_element_get_request_pad ()"><code class="function">gst_element_get_request_pad()</code></a>
call to instantiate a pad from this template.
</p>
<p>
Padtemplates can be created with <a class="link" href="GstPadTemplate.html#gst-pad-template-new" title="gst_pad_template_new ()"><code class="function">gst_pad_template_new()</code></a> or with
<a class="link" href="GstPadTemplate.html#gst-static-pad-template-get" title="gst_static_pad_template_get ()"><code class="function">gst_static_pad_template_get()</code></a>, which creates a <a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="type">GstPadTemplate</span></a> from a
<a class="link" href="GstPadTemplate.html#GstStaticPadTemplate" title="struct GstStaticPadTemplate"><span class="type">GstStaticPadTemplate</span></a> that can be filled with the
convenient <a class="link" href="GstPadTemplate.html#GST-STATIC-PAD-TEMPLATE:CAPS" title="GST_STATIC_PAD_TEMPLATE()"><code class="function">GST_STATIC_PAD_TEMPLATE()</code></a> macro.
</p>
<p>
A padtemplate can be used to create a pad (see <a class="link" href="GstPad.html#gst-pad-new-from-template" title="gst_pad_new_from_template ()"><code class="function">gst_pad_new_from_template()</code></a>
or <a class="link" href="GstPad.html#gst-pad-new-from-static-template" title="gst_pad_new_from_static_template ()"><code class="function">gst_pad_new_from_static_template()</code></a>) or to add to an element class
(see <a class="link" href="GstElement.html#gst-element-class-add-pad-template" title="gst_element_class_add_pad_template ()"><code class="function">gst_element_class_add_pad_template()</code></a>).
</p>
<p>
The following code example shows the code to create a pad from a padtemplate.
</p>
<div class="example">
<a name="idp21238544"></a><p class="title"><b>Example 11. Create a pad from a padtemplate</b></p>
<div class="example-contents">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17</pre></td>
<td class="listing_code"><pre class="programlisting">GstStaticPadTemplate my_template <span class="gtkdoc opt">=</span>
<span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPadTemplate.html#GST-STATIC-PAD-TEMPLATE:CAPS">GST_STATIC_PAD_TEMPLATE</a></span> <span class="gtkdoc opt">(</span>
<span class="string">"sink"</span><span class="gtkdoc opt">,</span> <span class="gtkdoc slc">// the name of the pad</span>
GST_PAD_SINK<span class="gtkdoc opt">,</span> <span class="gtkdoc slc">// the direction of the pad</span>
GST_PAD_ALWAYS<span class="gtkdoc opt">,</span> <span class="gtkdoc slc">// when this pad will be present</span>
<span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstCaps.html#GST-STATIC-CAPS">GST_STATIC_CAPS</a></span> <span class="gtkdoc opt">(</span> <span class="gtkdoc slc">// the capabilities of the padtemplate</span>
<span class="string">"audio/x-raw, "</span>
<span class="string">"channels = (int) [ 1, 6 ]"</span>
<span class="gtkdoc opt">)</span>
<span class="gtkdoc opt">);</span>
<span class="gtkdoc kwb">void</span>
<span class="function">my_method</span> <span class="gtkdoc opt">(</span><span class="gtkdoc kwb">void</span><span class="gtkdoc opt">)</span>
<span class="gtkdoc opt">{</span>
GstPad <span class="gtkdoc opt">*</span>pad<span class="gtkdoc opt">;</span>
pad <span class="gtkdoc opt">=</span> <span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#gst-pad-new-from-static-template">gst_pad_new_from_static_template</a></span> <span class="gtkdoc opt">(&</span>my_template<span class="gtkdoc opt">,</span> <span class="string">"sink"</span><span class="gtkdoc opt">);</span>
<span class="gtkdoc opt">...</span>
<span class="gtkdoc opt">}</span></pre></td>
</tr>
</tbody>
</table>
</div>
</div>
<p><br class="example-break">
</p>
<p>
The following example shows you how to add the padtemplate to an
element class, this is usually done in the class_init of the class:
</p>
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
2
3
4
5
6
7
8</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="gtkdoc kwb">static void</span>
<span class="function">my_element_class_init</span> <span class="gtkdoc opt">(</span>GstMyElementClass <span class="gtkdoc opt">*</span>klass<span class="gtkdoc opt">)</span>
<span class="gtkdoc opt">{</span>
GstElementClass <span class="gtkdoc opt">*</span>gstelement_class <span class="gtkdoc opt">=</span> <span class="function">GST_ELEMENT_CLASS</span> <span class="gtkdoc opt">(</span>klass<span class="gtkdoc opt">);</span>
<span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstElement.html#gst-element-class-add-pad-template">gst_element_class_add_pad_template</a></span> <span class="gtkdoc opt">(</span>gstelement_class<span class="gtkdoc opt">,</span>
<span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPadTemplate.html#gst-static-pad-template-get">gst_static_pad_template_get</a></span> <span class="gtkdoc opt">(&</span>my_template<span class="gtkdoc opt">));</span>
<span class="gtkdoc opt">}</span></pre></td>
</tr>
</tbody>
</table>
</div>
<p>
</p>
<p>
Last reviewed on 2006-02-14 (0.10.3)
</p>
</div>
<div class="refsect1">
<a name="GstPadTemplate.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GstStaticPadTemplate"></a><h3>struct GstStaticPadTemplate</h3>
<pre class="programlisting">struct GstStaticPadTemplate {
const gchar *name_template;
GstPadDirection direction;
GstPadPresence presence;
GstStaticCaps static_caps;
};
</pre>
<p>
Structure describing the <a class="link" href="GstPadTemplate.html#GstStaticPadTemplate" title="struct GstStaticPadTemplate"><span class="type">GstStaticPadTemplate</span></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term">const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="GstStaticPadTemplate.name-template"></a>name_template</code></em>;</span></p></td>
<td>the name of the template</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="GstPad.html#GstPadDirection" title="enum GstPadDirection"><span class="type">GstPadDirection</span></a> <em class="structfield"><code><a name="GstStaticPadTemplate.direction"></a>direction</code></em>;</span></p></td>
<td>the direction of the template</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="GstPadTemplate.html#GstPadPresence" title="enum GstPadPresence"><span class="type">GstPadPresence</span></a> <em class="structfield"><code><a name="GstStaticPadTemplate.presence"></a>presence</code></em>;</span></p></td>
<td>the presence of the template</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="gstreamer-GstCaps.html#GstStaticCaps" title="struct GstStaticCaps"><span class="type">GstStaticCaps</span></a> <em class="structfield"><code><a name="GstStaticPadTemplate.static-caps"></a>static_caps</code></em>;</span></p></td>
<td>the caps of the template.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-STATIC-PAD-TEMPLATE:CAPS"></a><h3>GST_STATIC_PAD_TEMPLATE()</h3>
<pre class="programlisting">#define GST_STATIC_PAD_TEMPLATE(padname, dir, pres, caps)</pre>
<p>
Convenience macro to fill the values of a GstStaticPadTemplate
structure.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>padname</code></em> :</span></p></td>
<td>the name template of the pad</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dir</code></em> :</span></p></td>
<td>the GstPadDirection of the pad</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>pres</code></em> :</span></p></td>
<td>the GstPadPresence of the pad</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>caps</code></em> :</span></p></td>
<td>the GstStaticCaps of the pad</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-static-pad-template-get"></a><h3>gst_static_pad_template_get ()</h3>
<pre class="programlisting"><a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="returnvalue">GstPadTemplate</span></a> * gst_static_pad_template_get (<em class="parameter"><code><a class="link" href="GstPadTemplate.html#GstStaticPadTemplate" title="struct GstStaticPadTemplate"><span class="type">GstStaticPadTemplate</span></a> *pad_template</code></em>);</pre>
<p>
Converts a <a class="link" href="GstPadTemplate.html#GstStaticPadTemplate" title="struct GstStaticPadTemplate"><span class="type">GstStaticPadTemplate</span></a> into a <a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="type">GstPadTemplate</span></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad_template</code></em> :</span></p></td>
<td>the static pad template</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new <a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="type">GstPadTemplate</span></a>. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-static-pad-template-get-caps"></a><h3>gst_static_pad_template_get_caps ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="returnvalue">GstCaps</span></a> * gst_static_pad_template_get_caps (<em class="parameter"><code><a class="link" href="GstPadTemplate.html#GstStaticPadTemplate" title="struct GstStaticPadTemplate"><span class="type">GstStaticPadTemplate</span></a> *templ</code></em>);</pre>
<p>
Gets the capabilities of the static pad template.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>templ</code></em> :</span></p></td>
<td>a <a class="link" href="GstPadTemplate.html#GstStaticPadTemplate" title="struct GstStaticPadTemplate"><span class="type">GstStaticPadTemplate</span></a> to get capabilities of.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the <a class="link" href="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="type">GstCaps</span></a> of the static pad template.
Unref after usage. Since the core holds an additional
ref to the returned caps, use <a class="link" href="gstreamer-GstCaps.html#gst-caps-make-writable" title="gst_caps_make_writable()"><code class="function">gst_caps_make_writable()</code></a>
on the returned caps to modify it. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstPadTemplate-struct"></a><h3>struct GstPadTemplate</h3>
<pre class="programlisting">struct GstPadTemplate;</pre>
<p>
The padtemplate object.
</p>
</div>
<hr>
<div class="refsect2">
<a name="GstPadTemplateFlags"></a><h3>enum GstPadTemplateFlags</h3>
<pre class="programlisting">typedef enum {
/* padding */
GST_PAD_TEMPLATE_FLAG_LAST = (GST_OBJECT_FLAG_LAST << 4)
} GstPadTemplateFlags;
</pre>
<p>
Flags for the padtemplate
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><a name="GST-PAD-TEMPLATE-FLAG-LAST:CAPS"></a><span class="term"><code class="literal">GST_PAD_TEMPLATE_FLAG_LAST</code></span></p></td>
<td>first flag that can be used by subclasses.
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstPadPresence"></a><h3>enum GstPadPresence</h3>
<pre class="programlisting">typedef enum {
GST_PAD_ALWAYS,
GST_PAD_SOMETIMES,
GST_PAD_REQUEST
} GstPadPresence;
</pre>
<p>
Indicates when this pad will become available.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="GST-PAD-ALWAYS:CAPS"></a><span class="term"><code class="literal">GST_PAD_ALWAYS</code></span></p></td>
<td>the pad is always available
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-SOMETIMES:CAPS"></a><span class="term"><code class="literal">GST_PAD_SOMETIMES</code></span></p></td>
<td>the pad will become available depending on the media stream
</td>
</tr>
<tr>
<td><p><a name="GST-PAD-REQUEST:CAPS"></a><span class="term"><code class="literal">GST_PAD_REQUEST</code></span></p></td>
<td>the pad is only available on request with
<a class="link" href="GstElement.html#gst-element-get-request-pad" title="gst_element_get_request_pad ()"><code class="function">gst_element_get_request_pad()</code></a>.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-PAD-TEMPLATE-NAME-TEMPLATE:CAPS"></a><h3>GST_PAD_TEMPLATE_NAME_TEMPLATE()</h3>
<pre class="programlisting">#define GST_PAD_TEMPLATE_NAME_TEMPLATE(templ) (((GstPadTemplate *)(templ))->name_template)
</pre>
<p>
Get the nametemplate of the padtemplate.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>templ</code></em> :</span></p></td>
<td>the template to query</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-PAD-TEMPLATE-DIRECTION:CAPS"></a><h3>GST_PAD_TEMPLATE_DIRECTION()</h3>
<pre class="programlisting">#define GST_PAD_TEMPLATE_DIRECTION(templ) (((GstPadTemplate *)(templ))->direction)
</pre>
<p>
Get the <a class="link" href="GstPad.html#GstPadDirection" title="enum GstPadDirection"><span class="type">GstPadDirection</span></a> of the padtemplate.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>templ</code></em> :</span></p></td>
<td>the template to query</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-PAD-TEMPLATE-PRESENCE:CAPS"></a><h3>GST_PAD_TEMPLATE_PRESENCE()</h3>
<pre class="programlisting">#define GST_PAD_TEMPLATE_PRESENCE(templ) (((GstPadTemplate *)(templ))->presence)
</pre>
<p>
Get the <a class="link" href="GstPadTemplate.html#GstPadPresence" title="enum GstPadPresence"><span class="type">GstPadPresence</span></a> of the padtemplate.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>templ</code></em> :</span></p></td>
<td>the template to query</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-PAD-TEMPLATE-CAPS"></a><h3>GST_PAD_TEMPLATE_CAPS()</h3>
<pre class="programlisting">#define GST_PAD_TEMPLATE_CAPS(templ) (((GstPadTemplate *)(templ))->caps)
</pre>
<p>
Get a handle to the padtemplate <a class="link" href="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="type">GstCaps</span></a>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>templ</code></em> :</span></p></td>
<td>the template to query</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-PAD-TEMPLATE-IS-FIXED:CAPS"></a><h3>GST_PAD_TEMPLATE_IS_FIXED()</h3>
<pre class="programlisting">#define GST_PAD_TEMPLATE_IS_FIXED(templ) (GST_OBJECT_FLAG_IS_SET(templ, GST_PAD_TEMPLATE_FIXED))
</pre>
<p>
Check if the properties of the padtemplate are fixed
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>templ</code></em> :</span></p></td>
<td>the template to query</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-template-new"></a><h3>gst_pad_template_new ()</h3>
<pre class="programlisting"><a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="returnvalue">GstPadTemplate</span></a> * gst_pad_template_new (<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name_template</code></em>,
<em class="parameter"><code><a class="link" href="GstPad.html#GstPadDirection" title="enum GstPadDirection"><span class="type">GstPadDirection</span></a> direction</code></em>,
<em class="parameter"><code><a class="link" href="GstPadTemplate.html#GstPadPresence" title="enum GstPadPresence"><span class="type">GstPadPresence</span></a> presence</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="type">GstCaps</span></a> *caps</code></em>);</pre>
<p>
Creates a new pad template with a name according to the given template
and with the given arguments.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>name_template</code></em> :</span></p></td>
<td>the name template.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>direction</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html#GstPadDirection" title="enum GstPadDirection"><span class="type">GstPadDirection</span></a> of the template.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>presence</code></em> :</span></p></td>
<td>the <a class="link" href="GstPadTemplate.html#GstPadPresence" title="enum GstPadPresence"><span class="type">GstPadPresence</span></a> of the pad.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>caps</code></em> :</span></p></td>
<td>a <a class="link" href="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="type">GstCaps</span></a> set for the template. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new <a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="type">GstPadTemplate</span></a>. <span class="annotation">[transfer floating]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-pad-template-get-caps"></a><h3>gst_pad_template_get_caps ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="returnvalue">GstCaps</span></a> * gst_pad_template_get_caps (<em class="parameter"><code><a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="type">GstPadTemplate</span></a> *templ</code></em>);</pre>
<p>
Gets the capabilities of the pad template.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>templ</code></em> :</span></p></td>
<td>a <a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="type">GstPadTemplate</span></a> to get capabilities of.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the <a class="link" href="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="type">GstCaps</span></a> of the pad template.
Unref after usage. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
</div>
<div class="refsect1">
<a name="GstPadTemplate.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="GstPadTemplate--caps"></a><h3>The <code class="literal">"caps"</code> property</h3>
<pre class="programlisting"> "caps" <a class="link" href="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="type">GstCaps</span></a>* : Read / Write / Construct Only</pre>
<p>
The capabilities of the pad described by the pad template.
</p>
<p class="since">Since 0.10.21</p>
</div>
<hr>
<div class="refsect2">
<a name="GstPadTemplate--direction"></a><h3>The <code class="literal">"direction"</code> property</h3>
<pre class="programlisting"> "direction" <a class="link" href="GstPad.html#GstPadDirection" title="enum GstPadDirection"><span class="type">GstPadDirection</span></a> : Read / Write / Construct Only</pre>
<p>
The direction of the pad described by the pad template.
</p>
<p>Default value: GST_PAD_UNKNOWN</p>
<p class="since">Since 0.10.21</p>
</div>
<hr>
<div class="refsect2">
<a name="GstPadTemplate--name-template"></a><h3>The <code class="literal">"name-template"</code> property</h3>
<pre class="programlisting"> "name-template" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a>* : Read / Write / Construct Only</pre>
<p>
The name template of the pad template.
</p>
<p>Default value: NULL</p>
<p class="since">Since 0.10.21</p>
</div>
<hr>
<div class="refsect2">
<a name="GstPadTemplate--presence"></a><h3>The <code class="literal">"presence"</code> property</h3>
<pre class="programlisting"> "presence" <a class="link" href="GstPadTemplate.html#GstPadPresence" title="enum GstPadPresence"><span class="type">GstPadPresence</span></a> : Read / Write / Construct Only</pre>
<p>
When the pad described by the pad template will become available.
</p>
<p>Default value: GST_PAD_ALWAYS</p>
<p class="since">Since 0.10.21</p>
</div>
</div>
<div class="refsect1">
<a name="GstPadTemplate.signal-details"></a><h2>Signal Details</h2>
<div class="refsect2">
<a name="GstPadTemplate-pad-created"></a><h3>The <code class="literal">"pad-created"</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">void</span> user_function (<a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="type">GstPadTemplate</span></a> *pad_template,
<a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad,
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data) : <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS"><code class="literal">Run Last</code></a></pre>
<p>
This signal is fired when an element creates a pad from this template.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad_template</code></em> :</span></p></td>
<td>the object which received the signal.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>the pad that was created.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data set when the signal handler was connected.</td>
</tr>
</tbody>
</table></div>
</div>
</div>
<div class="refsect1">
<a name="GstPadTemplate.see-also"></a><h2>See Also</h2>
<a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>, <a class="link" href="GstElementFactory.html" title="GstElementFactory"><span class="type">GstElementFactory</span></a>
</div>
</div>
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