gst/html/GstGhostPad.html

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<a name="GstGhostPad"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="GstGhostPad.top_of_page"></a>GstGhostPad</span></h2>
<p>GstGhostPad — Pseudo link pads</p>
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<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="GstGhostPad.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">
<a class="link" href="GstPad.html" title="GstPad"><span class="returnvalue">GstPad</span></a> *
</td>
<td class="function_name">
<a class="link" href="GstGhostPad.html#gst-ghost-pad-new" title="gst_ghost_pad_new ()">gst_ghost_pad_new</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="GstPad.html" title="GstPad"><span class="returnvalue">GstPad</span></a> *
</td>
<td class="function_name">
<a class="link" href="GstGhostPad.html#gst-ghost-pad-new-no-target" title="gst_ghost_pad_new_no_target ()">gst_ghost_pad_new_no_target</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="GstPad.html" title="GstPad"><span class="returnvalue">GstPad</span></a> *
</td>
<td class="function_name">
<a class="link" href="GstGhostPad.html#gst-ghost-pad-new-from-template" title="gst_ghost_pad_new_from_template ()">gst_ghost_pad_new_from_template</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="GstPad.html" title="GstPad"><span class="returnvalue">GstPad</span></a> *
</td>
<td class="function_name">
<a class="link" href="GstGhostPad.html#gst-ghost-pad-new-no-target-from-template" title="gst_ghost_pad_new_no_target_from_template ()">gst_ghost_pad_new_no_target_from_template</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="GstGhostPad.html#gst-ghost-pad-set-target" title="gst_ghost_pad_set_target ()">gst_ghost_pad_set_target</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="GstPad.html" title="GstPad"><span class="returnvalue">GstPad</span></a> *
</td>
<td class="function_name">
<a class="link" href="GstGhostPad.html#gst-ghost-pad-get-target" title="gst_ghost_pad_get_target ()">gst_ghost_pad_get_target</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="GstGhostPad.html#gst-ghost-pad-construct" title="gst_ghost_pad_construct ()">gst_ghost_pad_construct</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="GstGhostPad.html#gst-ghost-pad-activate-mode-default" title="gst_ghost_pad_activate_mode_default ()">gst_ghost_pad_activate_mode_default</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="GstGhostPad.html#gst-ghost-pad-internal-activate-mode-default" title="gst_ghost_pad_internal_activate_mode_default ()">gst_ghost_pad_internal_activate_mode_default</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="GstGhostPad.html#GstProxyPad"><span class="returnvalue">GstProxyPad</span></a> *
</td>
<td class="function_name">
<a class="link" href="GstGhostPad.html#gst-proxy-pad-get-internal" title="gst_proxy_pad_get_internal ()">gst_proxy_pad_get_internal</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="returnvalue">GstIterator</span></a> *
</td>
<td class="function_name">
<a class="link" href="GstGhostPad.html#gst-proxy-pad-iterate-internal-links-default" title="gst_proxy_pad_iterate_internal_links_default ()">gst_proxy_pad_iterate_internal_links_default</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="GstPad.html#GstFlowReturn" title="enum GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a>
</td>
<td class="function_name">
<a class="link" href="GstGhostPad.html#gst-proxy-pad-chain-default" title="gst_proxy_pad_chain_default ()">gst_proxy_pad_chain_default</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="GstPad.html#GstFlowReturn" title="enum GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a>
</td>
<td class="function_name">
<a class="link" href="GstGhostPad.html#gst-proxy-pad-chain-list-default" title="gst_proxy_pad_chain_list_default ()">gst_proxy_pad_chain_list_default</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="GstPad.html#GstFlowReturn" title="enum GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a>
</td>
<td class="function_name">
<a class="link" href="GstGhostPad.html#gst-proxy-pad-getrange-default" title="gst_proxy_pad_getrange_default ()">gst_proxy_pad_getrange_default</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<a name="GstProxyPad"></a><div class="refsect1">
<a name="GstGhostPad.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">struct</td>
<td class="function_name"><a class="link" href="GstGhostPad.html#GstProxyPad-struct" title="struct GstProxyPad">GstProxyPad</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="GstGhostPad.html#GstGhostPad-struct" title="struct GstGhostPad">GstGhostPad</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GstGhostPad.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen">    <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject-struct">GObject</a>
    <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GInitiallyUnowned">GInitiallyUnowned</a>
        <span class="lineart">╰──</span> <a class="link" href="GstObject.html" title="GstObject">GstObject</a>
            <span class="lineart">╰──</span> <a class="link" href="GstPad.html" title="GstPad">GstPad</a>
                <span class="lineart">╰──</span> GstProxyPad
                    <span class="lineart">╰──</span> GstGhostPad
</pre>
</div>
<div class="refsect1">
<a name="GstGhostPad.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include &lt;gst/gst.h&gt;
</pre>
</div>
<div class="refsect1">
<a name="GstGhostPad.description"></a><h2>Description</h2>
<p>GhostPads are useful when organizing pipelines with <a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a> like elements.
The idea here is to create hierarchical element graphs. The bin element
contains a sub-graph. Now one would like to treat the bin-element like any
other <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a>. This is where GhostPads come into play. A GhostPad acts as
a proxy for another pad. Thus the bin can have sink and source ghost-pads
that are associated with sink and source pads of the child elements.</p>
<p>If the target pad is known at creation time, <a class="link" href="GstGhostPad.html#gst-ghost-pad-new" title="gst_ghost_pad_new ()"><code class="function">gst_ghost_pad_new()</code></a> is the
function to use to get a ghost-pad. Otherwise one can use <a class="link" href="GstGhostPad.html#gst-ghost-pad-new-no-target" title="gst_ghost_pad_new_no_target ()"><code class="function">gst_ghost_pad_new_no_target()</code></a>
to create the ghost-pad and use <a class="link" href="GstGhostPad.html#gst-ghost-pad-set-target" title="gst_ghost_pad_set_target ()"><code class="function">gst_ghost_pad_set_target()</code></a> to establish the
association later on.</p>
<p>Note that GhostPads add overhead to the data processing of a pipeline.</p>
</div>
<div class="refsect1">
<a name="GstGhostPad.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="gst-ghost-pad-new"></a><h3>gst_ghost_pad_new ()</h3>
<pre class="programlisting"><a class="link" href="GstPad.html" title="GstPad"><span class="returnvalue">GstPad</span></a> *
gst_ghost_pad_new (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
                   <em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *target</code></em>);</pre>
<p>Create a new ghostpad with <em class="parameter"><code>target</code></em>
 as the target. The direction will be taken
from the target pad. <em class="parameter"><code>target</code></em>
 must be unlinked.</p>
<p>Will ref the target.</p>
<div class="refsect3">
<a name="gst-ghost-pad-new.parameters"></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>name</p></td>
<td class="parameter_description"><p>the name of the new pad, or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> to assign a default name. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>target</p></td>
<td class="parameter_description"><p>the pad to ghost. </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="gst-ghost-pad-new.returns"></a><h4>Returns</h4>
<p>a new <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>, or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> in
case of an error. </p>
<p><span class="annotation">[<acronym title="Alias for transfer none, used for objects with floating refs."><span class="acronym">transfer floating</span></acronym>][<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-ghost-pad-new-no-target"></a><h3>gst_ghost_pad_new_no_target ()</h3>
<pre class="programlisting"><a class="link" href="GstPad.html" title="GstPad"><span class="returnvalue">GstPad</span></a> *
gst_ghost_pad_new_no_target (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
                             <em class="parameter"><code><a class="link" href="GstPad.html#GstPadDirection" title="enum GstPadDirection"><span class="type">GstPadDirection</span></a> dir</code></em>);</pre>
<p>Create a new ghostpad without a target with the given direction.
A target can be set on the ghostpad later with the
<a class="link" href="GstGhostPad.html#gst-ghost-pad-set-target" title="gst_ghost_pad_set_target ()"><code class="function">gst_ghost_pad_set_target()</code></a> function.</p>
<p>The created ghostpad will not have a padtemplate.</p>
<div class="refsect3">
<a name="gst-ghost-pad-new-no-target.parameters"></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>name</p></td>
<td class="parameter_description"><p>the name of the new pad, or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> to assign a default name. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>dir</p></td>
<td class="parameter_description"><p>the direction of the ghostpad</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-ghost-pad-new-no-target.returns"></a><h4>Returns</h4>
<p>a new <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>, or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> in
case of an error. </p>
<p><span class="annotation">[<acronym title="Alias for transfer none, used for objects with floating refs."><span class="acronym">transfer floating</span></acronym>][<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-ghost-pad-new-from-template"></a><h3>gst_ghost_pad_new_from_template ()</h3>
<pre class="programlisting"><a class="link" href="GstPad.html" title="GstPad"><span class="returnvalue">GstPad</span></a> *
gst_ghost_pad_new_from_template (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
                                 <em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *target</code></em>,
                                 <em class="parameter"><code><a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="type">GstPadTemplate</span></a> *templ</code></em>);</pre>
<p>Create a new ghostpad with <em class="parameter"><code>target</code></em>
 as the target. The direction will be taken
from the target pad. The template used on the ghostpad will be <em class="parameter"><code>template</code></em>
.</p>
<p>Will ref the target.</p>
<div class="refsect3">
<a name="gst-ghost-pad-new-from-template.parameters"></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>name</p></td>
<td class="parameter_description"><p>the name of the new pad, or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> to assign a default name. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>target</p></td>
<td class="parameter_description"><p>the pad to ghost. </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>
<tr>
<td class="parameter_name"><p>templ</p></td>
<td class="parameter_description"><p>the <a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="type">GstPadTemplate</span></a> to use on the ghostpad. </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="gst-ghost-pad-new-from-template.returns"></a><h4>Returns</h4>
<p>a new <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>, or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> in
case of an error. </p>
<p><span class="annotation">[<acronym title="Alias for transfer none, used for objects with floating refs."><span class="acronym">transfer floating</span></acronym>][<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-ghost-pad-new-no-target-from-template"></a><h3>gst_ghost_pad_new_no_target_from_template ()</h3>
<pre class="programlisting"><a class="link" href="GstPad.html" title="GstPad"><span class="returnvalue">GstPad</span></a> *
gst_ghost_pad_new_no_target_from_template
                               (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
                                <em class="parameter"><code><a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="type">GstPadTemplate</span></a> *templ</code></em>);</pre>
<p>Create a new ghostpad based on <em class="parameter"><code>templ</code></em>
, without setting a target. The
direction will be taken from the <em class="parameter"><code>templ</code></em>
.</p>
<div class="refsect3">
<a name="gst-ghost-pad-new-no-target-from-template.parameters"></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>name</p></td>
<td class="parameter_description"><p>the name of the new pad, or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> to assign a default name. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>templ</p></td>
<td class="parameter_description"><p>the <a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="type">GstPadTemplate</span></a> to create the ghostpad from. </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="gst-ghost-pad-new-no-target-from-template.returns"></a><h4>Returns</h4>
<p>a new <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>, or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> in
case of an error. </p>
<p><span class="annotation">[<acronym title="Alias for transfer none, used for objects with floating refs."><span class="acronym">transfer floating</span></acronym>][<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-ghost-pad-set-target"></a><h3>gst_ghost_pad_set_target ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_ghost_pad_set_target (<em class="parameter"><code><a class="link" href="GstGhostPad.html" title="GstGhostPad"><span class="type">GstGhostPad</span></a> *gpad</code></em>,
                          <em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *newtarget</code></em>);</pre>
<p>Set the new target of the ghostpad <em class="parameter"><code>gpad</code></em>
. Any existing target
is unlinked and links to the new target are established. if <em class="parameter"><code>newtarget</code></em>
 is
<a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> the target will be cleared.</p>
<div class="refsect3">
<a name="gst-ghost-pad-set-target.parameters"></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>gpad</p></td>
<td class="parameter_description"><p>the <a class="link" href="GstGhostPad.html" title="GstGhostPad"><span class="type">GstGhostPad</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>newtarget</p></td>
<td class="parameter_description"><p>the new pad target. </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>][<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-ghost-pad-set-target.returns"></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 new target could be set. This function
can return <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> when the internal pads could not be linked.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-ghost-pad-get-target"></a><h3>gst_ghost_pad_get_target ()</h3>
<pre class="programlisting"><a class="link" href="GstPad.html" title="GstPad"><span class="returnvalue">GstPad</span></a> *
gst_ghost_pad_get_target (<em class="parameter"><code><a class="link" href="GstGhostPad.html" title="GstGhostPad"><span class="type">GstGhostPad</span></a> *gpad</code></em>);</pre>
<p>Get the target pad of <em class="parameter"><code>gpad</code></em>
. Unref target pad after usage.</p>
<div class="refsect3">
<a name="gst-ghost-pad-get-target.parameters"></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>gpad</p></td>
<td class="parameter_description"><p>the <a class="link" href="GstGhostPad.html" title="GstGhostPad"><span class="type">GstGhostPad</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-ghost-pad-get-target.returns"></a><h4>Returns</h4>
<p>the target <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>, can be
<a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> if the ghostpad has no target set. Unref target pad after
usage. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>][<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-ghost-pad-construct"></a><h3>gst_ghost_pad_construct ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_ghost_pad_construct (<em class="parameter"><code><a class="link" href="GstGhostPad.html" title="GstGhostPad"><span class="type">GstGhostPad</span></a> *gpad</code></em>);</pre>
<p>Finish initialization of a newly allocated ghost pad.</p>
<p>This function is most useful in language bindings and when subclassing
<a class="link" href="GstGhostPad.html" title="GstGhostPad"><span class="type">GstGhostPad</span></a>; plugin and application developers normally will not call this
function. Call this function directly after a call to g_object_new
(GST_TYPE_GHOST_PAD, "direction", <em class="parameter"><code>dir</code></em>
, ..., NULL).</p>
<div class="refsect3">
<a name="gst-ghost-pad-construct.parameters"></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>gpad</p></td>
<td class="parameter_description"><p>the newly allocated ghost pad</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-ghost-pad-construct.returns"></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 construction succeeds, <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> otherwise.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-ghost-pad-activate-mode-default"></a><h3>gst_ghost_pad_activate_mode_default ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_ghost_pad_activate_mode_default (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>,
                                     <em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *parent</code></em>,
                                     <em class="parameter"><code><a class="link" href="GstPad.html#GstPadMode" title="enum GstPadMode"><span class="type">GstPadMode</span></a> mode</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>Invoke the default activate mode function of a ghost pad.</p>
<div class="refsect3">
<a name="gst-ghost-pad-activate-mode-default.parameters"></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>pad</p></td>
<td class="parameter_description"><p>the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to activate or deactivate.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>parent</p></td>
<td class="parameter_description"><p>the parent of <em class="parameter"><code>pad</code></em>
or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>mode</p></td>
<td class="parameter_description"><p>the requested activation mode</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>active</p></td>
<td class="parameter_description"><p>whether the pad should be active or not.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-ghost-pad-activate-mode-default.returns"></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 operation was successful.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-ghost-pad-internal-activate-mode-default"></a><h3>gst_ghost_pad_internal_activate_mode_default ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_ghost_pad_internal_activate_mode_default
                               (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>,
                                <em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *parent</code></em>,
                                <em class="parameter"><code><a class="link" href="GstPad.html#GstPadMode" title="enum GstPadMode"><span class="type">GstPadMode</span></a> mode</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>Invoke the default activate mode function of a proxy pad that is
owned by a ghost pad.</p>
<div class="refsect3">
<a name="gst-ghost-pad-internal-activate-mode-default.parameters"></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>pad</p></td>
<td class="parameter_description"><p>the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to activate or deactivate.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>parent</p></td>
<td class="parameter_description"><p>the parent of <em class="parameter"><code>pad</code></em>
or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>mode</p></td>
<td class="parameter_description"><p>the requested activation mode</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>active</p></td>
<td class="parameter_description"><p>whether the pad should be active or not.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-ghost-pad-internal-activate-mode-default.returns"></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 operation was successful.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-proxy-pad-get-internal"></a><h3>gst_proxy_pad_get_internal ()</h3>
<pre class="programlisting"><a class="link" href="GstGhostPad.html#GstProxyPad"><span class="returnvalue">GstProxyPad</span></a> *
gst_proxy_pad_get_internal (<em class="parameter"><code><a class="link" href="GstGhostPad.html#GstProxyPad"><span class="type">GstProxyPad</span></a> *pad</code></em>);</pre>
<p>Get the internal pad of <em class="parameter"><code>pad</code></em>
. Unref target pad after usage.</p>
<p>The internal pad of a <a class="link" href="GstGhostPad.html" title="GstGhostPad"><span class="type">GstGhostPad</span></a> is the internally used
pad of opposite direction, which is used to link to the target.</p>
<div class="refsect3">
<a name="gst-proxy-pad-get-internal.parameters"></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>pad</p></td>
<td class="parameter_description"><p>the <a class="link" href="GstGhostPad.html#GstProxyPad"><span class="type">GstProxyPad</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-proxy-pad-get-internal.returns"></a><h4>Returns</h4>
<p>the target <a class="link" href="GstGhostPad.html#GstProxyPad"><span class="type">GstProxyPad</span></a>, can
be <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.  Unref target pad after usage. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>][<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-proxy-pad-iterate-internal-links-default"></a><h3>gst_proxy_pad_iterate_internal_links_default ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="returnvalue">GstIterator</span></a> *
gst_proxy_pad_iterate_internal_links_default
                               (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>,
                                <em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *parent</code></em>);</pre>
<p>Invoke the default iterate internal links function of the proxy pad.</p>
<div class="refsect3">
<a name="gst-proxy-pad-iterate-internal-links-default.parameters"></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>pad</p></td>
<td class="parameter_description"><p>the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to get the internal links of.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>parent</p></td>
<td class="parameter_description"><p>the parent of <em class="parameter"><code>pad</code></em>
or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-proxy-pad-iterate-internal-links-default.returns"></a><h4>Returns</h4>
<p>a <a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="type">GstIterator</span></a> of <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>, or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> if <em class="parameter"><code>pad</code></em>
has no parent. Unref each returned pad with <a class="link" href="GstObject.html#gst-object-unref" title="gst_object_unref ()"><code class="function">gst_object_unref()</code></a>. </p>
<p><span class="annotation">[<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-proxy-pad-chain-default"></a><h3>gst_proxy_pad_chain_default ()</h3>
<pre class="programlisting"><a class="link" href="GstPad.html#GstFlowReturn" title="enum GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a>
gst_proxy_pad_chain_default (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>,
                             <em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *parent</code></em>,
                             <em class="parameter"><code><a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a> *buffer</code></em>);</pre>
<p>Invoke the default chain function of the proxy pad.</p>
<div class="refsect3">
<a name="gst-proxy-pad-chain-default.parameters"></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>pad</p></td>
<td class="parameter_description"><p>a sink <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>, returns GST_FLOW_ERROR if not.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>parent</p></td>
<td class="parameter_description"><p>the parent of <em class="parameter"><code>pad</code></em>
or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p>the <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a> to send, return GST_FLOW_ERROR
if not. </p></td>
<td class="parameter_annotations"><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 class="refsect3">
<a name="gst-proxy-pad-chain-default.returns"></a><h4>Returns</h4>
<p> a <a class="link" href="GstPad.html#GstFlowReturn" title="enum GstFlowReturn"><span class="type">GstFlowReturn</span></a> from the pad.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-proxy-pad-chain-list-default"></a><h3>gst_proxy_pad_chain_list_default ()</h3>
<pre class="programlisting"><a class="link" href="GstPad.html#GstFlowReturn" title="enum GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a>
gst_proxy_pad_chain_list_default (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>,
                                  <em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *parent</code></em>,
                                  <em class="parameter"><code><a class="link" href="GstBufferList.html" title="GstBufferList"><span class="type">GstBufferList</span></a> *list</code></em>);</pre>
<p>Invoke the default chain list function of the proxy pad.</p>
<div class="refsect3">
<a name="gst-proxy-pad-chain-list-default.parameters"></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>pad</p></td>
<td class="parameter_description"><p>a sink <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>, returns GST_FLOW_ERROR if not.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>parent</p></td>
<td class="parameter_description"><p>the parent of <em class="parameter"><code>pad</code></em>
or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>list</p></td>
<td class="parameter_description"><p>the <a class="link" href="GstBufferList.html" title="GstBufferList"><span class="type">GstBufferList</span></a> to send, return GST_FLOW_ERROR
if not. </p></td>
<td class="parameter_annotations"><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 class="refsect3">
<a name="gst-proxy-pad-chain-list-default.returns"></a><h4>Returns</h4>
<p> a <a class="link" href="GstPad.html#GstFlowReturn" title="enum GstFlowReturn"><span class="type">GstFlowReturn</span></a> from the pad.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-proxy-pad-getrange-default"></a><h3>gst_proxy_pad_getrange_default ()</h3>
<pre class="programlisting"><a class="link" href="GstPad.html#GstFlowReturn" title="enum GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a>
gst_proxy_pad_getrange_default (<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>,
                                <em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *parent</code></em>,
                                <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a> offset</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> size</code></em>,
                                <em class="parameter"><code><a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a> **buffer</code></em>);</pre>
<p>Invoke the default getrange function of the proxy pad.</p>
<div class="refsect3">
<a name="gst-proxy-pad-getrange-default.parameters"></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>pad</p></td>
<td class="parameter_description"><p>a src <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>, returns <a class="link" href="GstPad.html#GST-FLOW-ERROR:CAPS"><span class="type">GST_FLOW_ERROR</span></a> if not.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>parent</p></td>
<td class="parameter_description"><p>the parent of <em class="parameter"><code>pad</code></em>
</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>offset</p></td>
<td class="parameter_description"><p>The start offset of the buffer</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>size</p></td>
<td class="parameter_description"><p>The length of the buffer</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p>a pointer to hold the <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a>,
returns <a class="link" href="GstPad.html#GST-FLOW-ERROR:CAPS"><span class="type">GST_FLOW_ERROR</span></a> if <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Out parameter, where caller must allocate storage."><span class="acronym">out callee-allocates</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-proxy-pad-getrange-default.returns"></a><h4>Returns</h4>
<p> a <a class="link" href="GstPad.html#GstFlowReturn" title="enum GstFlowReturn"><span class="type">GstFlowReturn</span></a> from the pad.</p>
</div>
</div>
</div>
<div class="refsect1">
<a name="GstGhostPad.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GstProxyPad-struct"></a><h3>struct GstProxyPad</h3>
<pre class="programlisting">struct GstProxyPad;</pre>
</div>
<hr>
<div class="refsect2">
<a name="GstGhostPad-struct"></a><h3>struct GstGhostPad</h3>
<pre class="programlisting">struct GstGhostPad;</pre>
<p>Opaque <a class="link" href="GstGhostPad.html" title="GstGhostPad"><span class="type">GstGhostPad</span></a> structure.</p>
</div>
</div>
<div class="refsect1">
<a name="GstGhostPad.see-also"></a><h2>See Also</h2>
<p><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a></p>
</div>
</div>
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