plugins/html/gst-plugins-base-plugins-decodebin.html

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<a name="gst-plugins-base-plugins-decodebin"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="gst-plugins-base-plugins-decodebin.top_of_page"></a>decodebin</span></h2>
<p>decodebin</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="gst-plugins-base-plugins-decodebin.properties"></a><h2>Properties</h2>
<div class="informaltable"><table class="informaltable" border="0">
<colgroup>
<col width="150px" class="properties_type">
<col width="300px" class="properties_name">
<col width="200px" class="properties_flags">
</colgroup>
<tbody>
<tr>
<td class="property_type">
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstCaps.html#GstCaps-struct"><span class="type">GstCaps</span></a> *</td>
<td class="property_name"><a class="link" href="gst-plugins-base-plugins-decodebin.html#GstDecodeBin--caps" title="The “caps” property">caps</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-base-plugins-decodebin.html#GstDecodeBin--connection-speed" title="The “connection-speed” property">connection-speed</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-base-plugins-decodebin.html#GstDecodeBin--expose-all-streams" title="The “expose-all-streams” property">expose-all-streams</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-base-plugins-decodebin.html#GstDecodeBin--high-percent" title="The “high-percent” property">high-percent</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-base-plugins-decodebin.html#GstDecodeBin--low-percent" title="The “low-percent” property">low-percent</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-base-plugins-decodebin.html#GstDecodeBin--max-size-buffers" title="The “max-size-buffers” property">max-size-buffers</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-base-plugins-decodebin.html#GstDecodeBin--max-size-bytes" title="The “max-size-bytes” property">max-size-bytes</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-base-plugins-decodebin.html#GstDecodeBin--max-size-time" title="The “max-size-time” property">max-size-time</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-base-plugins-decodebin.html#GstDecodeBin--post-stream-topology" title="The “post-stream-topology” property">post-stream-topology</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type">
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstCaps.html#GstCaps-struct"><span class="type">GstCaps</span></a> *</td>
<td class="property_name"><a class="link" href="gst-plugins-base-plugins-decodebin.html#GstDecodeBin--sink-caps" title="The “sink-caps” property">sink-caps</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *</td>
<td class="property_name"><a class="link" href="gst-plugins-base-plugins-decodebin.html#GstDecodeBin--subtitle-encoding" title="The “subtitle-encoding” property">subtitle-encoding</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-base-plugins-decodebin.html#GstDecodeBin--use-buffering" title="The “use-buffering” property">use-buffering</a></td>
<td class="property_flags">Read / Write</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-plugins-decodebin.signals"></a><h2>Signals</h2>
<div class="informaltable"><table class="informaltable" border="0">
<colgroup>
<col width="150px" class="signals_return">
<col width="300px" class="signals_name">
<col width="200px" class="signals_flags">
</colgroup>
<tbody>
<tr>
<td class="signal_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a></td>
<td class="signal_name"><a class="link" href="gst-plugins-base-plugins-decodebin.html#GstDecodeBin-autoplug-continue" title="The “autoplug-continue” signal">autoplug-continue</a></td>
<td class="signal_flags"><a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS">Run Last</a></td>
</tr>
<tr>
<td class="signal_type">
<a href="/usr/share/gtk-doc/html/gobject/gobject-Value-arrays.html#GValueArray-struct"><span class="returnvalue">GValueArray</span></a>*</td>
<td class="signal_name"><a class="link" href="gst-plugins-base-plugins-decodebin.html#GstDecodeBin-autoplug-factories" title="The “autoplug-factories” signal">autoplug-factories</a></td>
<td class="signal_flags"><a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS">Run Last</a></td>
</tr>
<tr>
<td class="signal_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a></td>
<td class="signal_name"><a class="link" href="gst-plugins-base-plugins-decodebin.html#GstDecodeBin-autoplug-query" title="The “autoplug-query” signal">autoplug-query</a></td>
<td class="signal_flags"><a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS">Run Last</a></td>
</tr>
<tr>
<td class="signal_type"><span class="returnvalue">GstAutoplugSelectResult</span></td>
<td class="signal_name"><a class="link" href="gst-plugins-base-plugins-decodebin.html#GstDecodeBin-autoplug-select" title="The “autoplug-select” signal">autoplug-select</a></td>
<td class="signal_flags"><a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS">Run Last</a></td>
</tr>
<tr>
<td class="signal_type">
<a href="/usr/share/gtk-doc/html/gobject/gobject-Value-arrays.html#GValueArray-struct"><span class="returnvalue">GValueArray</span></a>*</td>
<td class="signal_name"><a class="link" href="gst-plugins-base-plugins-decodebin.html#GstDecodeBin-autoplug-sort" title="The “autoplug-sort” signal">autoplug-sort</a></td>
<td class="signal_flags"><a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS">Run Last</a></td>
</tr>
<tr>
<td class="signal_type"><span class="returnvalue">void</span></td>
<td class="signal_name"><a class="link" href="gst-plugins-base-plugins-decodebin.html#GstDecodeBin-drained" title="The “drained” signal">drained</a></td>
<td class="signal_flags"><a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS">Run Last</a></td>
</tr>
<tr>
<td class="signal_type"><span class="returnvalue">void</span></td>
<td class="signal_name"><a class="link" href="gst-plugins-base-plugins-decodebin.html#GstDecodeBin-unknown-type" title="The “unknown-type” signal">unknown-type</a></td>
<td class="signal_flags"><a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS">Run Last</a></td>
</tr>
</tbody>
</table></div>
</div>
<a name="GstDecodeBin"></a><div class="refsect1">
<a name="gst-plugins-base-plugins-decodebin.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="gst-plugins-base-plugins-decodebin.html#GstDecodeBin-struct" title="struct GstDecodeBin">GstDecodeBin</a></td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-plugins-decodebin.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 href="/usr/share/gtk-doc/html/gstreamer-1.0/GstObject.html#GstObject-struct">GstObject</a>
            <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstElement.html#GstElement-struct">GstElement</a>
                <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstBin.html#GstBin-struct">GstBin</a>
                    <span class="lineart">╰──</span> GstDecodeBin
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-plugins-decodebin.implemented-interfaces"></a><h2>Implemented Interfaces</h2>
<p>
GstDecodeBin implements
 <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstChildProxy.html#GstChildProxy-struct">GstChildProxy</a>.</p>
</div>
<div class="refsect1">
<a name="gst-plugins-base-plugins-decodebin.description"></a><h2>Description</h2>
<p><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstBin.html#GstBin-struct"><span class="type">GstBin</span></a> that auto-magically constructs a decoding pipeline using available
decoders and demuxers via auto-plugging.</p>
<p>decodebin is considered stable now and replaces the old <span class="type">decodebin</span> element.
<span class="type">uridecodebin</span> uses decodebin internally and is often more convenient to
use, as it creates a suitable source element as well.</p>
<div class="refsynopsisdiv">
<h2>Synopsis</h2>
<div class="refsect2">
<a name="id-1.2.17.9.4.1"></a><h3>Element Information</h3>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">plugin</span></p></td>
<td>
            <a class="link" href="gst-plugins-base-plugins-plugin-playback.html#plugin-playback">playback</a>
          </td>
</tr>
<tr>
<td><p><span class="term">author</span></p></td>
<td>Edward Hervey &lt;edward.hervey@collabora.co.uk&gt;, Sebastian Dröge &lt;sebastian.droege@collabora.co.uk&gt;</td>
</tr>
<tr>
<td><p><span class="term">class</span></p></td>
<td>Generic/Bin/Decoder</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="id-1.2.17.9.4.2"></a><h3>Element Pads</h3>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">name</span></p></td>
<td>sink</td>
</tr>
<tr>
<td><p><span class="term">direction</span></p></td>
<td>sink</td>
</tr>
<tr>
<td><p><span class="term">presence</span></p></td>
<td>always</td>
</tr>
<tr>
<td><p><span class="term">details</span></p></td>
<td>ANY</td>
</tr>
</tbody>
</table></div>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">name</span></p></td>
<td>src_%u</td>
</tr>
<tr>
<td><p><span class="term">direction</span></p></td>
<td>source</td>
</tr>
<tr>
<td><p><span class="term">presence</span></p></td>
<td>sometimes</td>
</tr>
<tr>
<td><p><span class="term">details</span></p></td>
<td>ANY</td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-plugins-decodebin.functions_details"></a><h2>Functions</h2>
<p></p>
</div>
<div class="refsect1">
<a name="gst-plugins-base-plugins-decodebin.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GstDecodeBin-struct"></a><h3>struct GstDecodeBin</h3>
<pre class="programlisting">struct GstDecodeBin;</pre>
<p>The opaque <a class="link" href="gst-plugins-base-plugins-decodebin.html#GstDecodeBin"><span class="type">GstDecodeBin</span></a> data structure</p>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-plugins-decodebin.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="GstDecodeBin--caps"></a><h3>The <code class="literal">“caps”</code> property</h3>
<pre class="programlisting">  “caps”                     <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstCaps.html#GstCaps-struct"><span class="type">GstCaps</span></a> *</pre>
<p>The caps on which to stop decoding.</p>
<p>Flags: Read / Write</p>
</div>
<hr>
<div class="refsect2">
<a name="GstDecodeBin--connection-speed"></a><h3>The <code class="literal">“connection-speed”</code> property</h3>
<pre class="programlisting">  “connection-speed”         <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a></pre>
<p>Network connection speed in kbps (0 = unknown).</p>
<p>Flags: Read / Write</p>
<p>Allowed values: &lt;= 18446744073709551</p>
<p>Default value: 0</p>
</div>
<hr>
<div class="refsect2">
<a name="GstDecodeBin--expose-all-streams"></a><h3>The <code class="literal">“expose-all-streams”</code> property</h3>
<pre class="programlisting">  “expose-all-streams”       <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></pre>
<p>Expose all streams, including those of unknown type or that don't match the 'caps' property.</p>
<p>Flags: Read / Write</p>
<p>Default value: TRUE</p>
</div>
<hr>
<div class="refsect2">
<a name="GstDecodeBin--high-percent"></a><h3>The <code class="literal">“high-percent”</code> property</h3>
<pre class="programlisting">  “high-percent”             <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a></pre>
<p>High threshold percent for buffering to finish.</p>
<p>Flags: Read / Write</p>
<p>Allowed values: [0,100]</p>
<p>Default value: 99</p>
</div>
<hr>
<div class="refsect2">
<a name="GstDecodeBin--low-percent"></a><h3>The <code class="literal">“low-percent”</code> property</h3>
<pre class="programlisting">  “low-percent”              <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a></pre>
<p>Low threshold percent for buffering to start.</p>
<p>Flags: Read / Write</p>
<p>Allowed values: [0,100]</p>
<p>Default value: 10</p>
</div>
<hr>
<div class="refsect2">
<a name="GstDecodeBin--max-size-buffers"></a><h3>The <code class="literal">“max-size-buffers”</code> property</h3>
<pre class="programlisting">  “max-size-buffers”         <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></pre>
<p>Max amount of buffers in the queue (0=automatic).</p>
<p>Flags: Read / Write</p>
<p>Default value: 0</p>
</div>
<hr>
<div class="refsect2">
<a name="GstDecodeBin--max-size-bytes"></a><h3>The <code class="literal">“max-size-bytes”</code> property</h3>
<pre class="programlisting">  “max-size-bytes”           <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></pre>
<p>Max amount of bytes in the queue (0=automatic).</p>
<p>Flags: Read / Write</p>
<p>Default value: 0</p>
</div>
<hr>
<div class="refsect2">
<a name="GstDecodeBin--max-size-time"></a><h3>The <code class="literal">“max-size-time”</code> property</h3>
<pre class="programlisting">  “max-size-time”            <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a></pre>
<p>Max amount of time in the queue (in ns, 0=automatic).</p>
<p>Flags: Read / Write</p>
<p>Default value: 0</p>
</div>
<hr>
<div class="refsect2">
<a name="GstDecodeBin--post-stream-topology"></a><h3>The <code class="literal">“post-stream-topology”</code> property</h3>
<pre class="programlisting">  “post-stream-topology”     <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></pre>
<p>Post stream-topology messages.</p>
<p>Flags: Read / Write</p>
<p>Default value: FALSE</p>
</div>
<hr>
<div class="refsect2">
<a name="GstDecodeBin--sink-caps"></a><h3>The <code class="literal">“sink-caps”</code> property</h3>
<pre class="programlisting">  “sink-caps”                <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstCaps.html#GstCaps-struct"><span class="type">GstCaps</span></a> *</pre>
<p>The caps of the input data. (NULL = use typefind element).</p>
<p>Flags: Read / Write</p>
</div>
<hr>
<div class="refsect2">
<a name="GstDecodeBin--subtitle-encoding"></a><h3>The <code class="literal">“subtitle-encoding”</code> property</h3>
<pre class="programlisting">  “subtitle-encoding”        <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *</pre>
<p>Encoding to assume if input subtitles are not in UTF-8 encoding. If not set, the GST_SUBTITLE_ENCODING environment variable will be checked for an encoding to use. If that is not set either, ISO-8859-15 will be assumed.</p>
<p>Flags: Read / Write</p>
<p>Default value: NULL</p>
</div>
<hr>
<div class="refsect2">
<a name="GstDecodeBin--use-buffering"></a><h3>The <code class="literal">“use-buffering”</code> property</h3>
<pre class="programlisting">  “use-buffering”            <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></pre>
<p>Emit GST_MESSAGE_BUFFERING based on low-/high-percent thresholds.</p>
<p>Flags: Read / Write</p>
<p>Default value: FALSE</p>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-plugins-decodebin.signal-details"></a><h2>Signal Details</h2>
<div class="refsect2">
<a name="GstDecodeBin-autoplug-continue"></a><h3>The <code class="literal">“autoplug-continue”</code> signal</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
user_function (<a class="link" href="gst-plugins-base-plugins-decodebin.html#GstDecodeBin"><span class="type">GstDecodeBin</span></a> *bin,
               <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstPad.html#GstPad-struct"><span class="type">GstPad</span></a>       *pad,
               <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstCaps.html#GstCaps-struct"><span class="type">GstCaps</span></a>      *caps,
               <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a>      user_data)</pre>
<p>This signal is emitted whenever decodebin finds a new stream. It is
emitted before looking for any elements that can handle that stream.</p>
<div class="blockquote"><blockquote class="blockquote"><p>  Invocation of signal handlers stops after the first signal handler
  returns <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a>. Signal handlers are invoked in the order they were
  connected in.</p></blockquote></div>
<div class="refsect3">
<a name="GstDecodeBin-autoplug-continue.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>bin</p></td>
<td class="parameter_description"><p>The decodebin.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>pad</p></td>
<td class="parameter_description"><p>The <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstPad.html#GstPad-struct"><span class="type">GstPad</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>caps</p></td>
<td class="parameter_description"><p>The <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstCaps.html#GstCaps-struct"><span class="type">GstCaps</span></a> found.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>user data set when the signal handler was connected.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="GstDecodeBin-autoplug-continue.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 you wish decodebin to look for elements that can
handle the given <em class="parameter"><code>caps</code></em>
. If <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a>, those caps will be considered as
final and the pad will be exposed as such (see 'pad-added' signal of
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstElement.html#GstElement-struct"><span class="type">GstElement</span></a>).</p>
</div>
<p>Flags: <a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS">Run Last</a></p>
</div>
<hr>
<div class="refsect2">
<a name="GstDecodeBin-autoplug-factories"></a><h3>The <code class="literal">“autoplug-factories”</code> signal</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gobject/gobject-Value-arrays.html#GValueArray-struct"><span class="returnvalue">GValueArray</span></a>*
user_function (<a class="link" href="gst-plugins-base-plugins-decodebin.html#GstDecodeBin"><span class="type">GstDecodeBin</span></a> *bin,
               <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstPad.html#GstPad-struct"><span class="type">GstPad</span></a>       *pad,
               <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstCaps.html#GstCaps-struct"><span class="type">GstCaps</span></a>      *caps,
               <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a>      user_data)</pre>
<p>This signal is emitted when an array of possible factories for <em class="parameter"><code>caps</code></em>
 on
<em class="parameter"><code>pad</code></em>
 is needed. Decodebin will by default return an array with all
compatible factories, sorted by rank.</p>
<p>If this function returns NULL, <em class="parameter"><code>pad</code></em>
 will be exposed as a final caps.</p>
<p>If this function returns an empty array, the pad will be considered as
having an unhandled type media type.</p>
<div class="blockquote"><blockquote class="blockquote"><p>  Only the signal handler that is connected first will ever by invoked.
  Don't connect signal handlers with the <a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-CONNECT-AFTER:CAPS"><span class="type">G_CONNECT_AFTER</span></a> flag to this
  signal, they will never be invoked!</p></blockquote></div>
<div class="refsect3">
<a name="GstDecodeBin-autoplug-factories.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>bin</p></td>
<td class="parameter_description"><p>The decodebin.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>pad</p></td>
<td class="parameter_description"><p>The <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstPad.html#GstPad-struct"><span class="type">GstPad</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>caps</p></td>
<td class="parameter_description"><p>The <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstCaps.html#GstCaps-struct"><span class="type">GstCaps</span></a> found.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>user data set when the signal handler was connected.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="GstDecodeBin-autoplug-factories.returns"></a><h4>Returns</h4>
<p> a <a href="/usr/share/gtk-doc/html/gobject/gobject-Value-arrays.html#GValueArray-struct"><span class="type">GValueArray</span></a>* with a list of factories to try. The factories are
by default tried in the returned order or based on the index returned by
"autoplug-select".</p>
</div>
<p>Flags: <a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS">Run Last</a></p>
</div>
<hr>
<div class="refsect2">
<a name="GstDecodeBin-autoplug-query"></a><h3>The <code class="literal">“autoplug-query”</code> signal</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
user_function (<a class="link" href="gst-plugins-base-plugins-decodebin.html#GstDecodeBin"><span class="type">GstDecodeBin</span></a> *bin,
               <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstPad.html#GstPad-struct"><span class="type">GstPad</span></a>       *child,
               <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstElement.html#GstElement-struct"><span class="type">GstElement</span></a>   *pad,
               <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstQuery.html#GstQuery-struct"><span class="type">GstQuery</span></a>     *query,
               <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a>      user_data)</pre>
<p>This signal is emitted whenever an autoplugged element that is
not linked downstream yet and not exposed does a query. It can
be used to tell the element about the downstream supported caps
for example.</p>
<div class="refsect3">
<a name="GstDecodeBin-autoplug-query.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>bin</p></td>
<td class="parameter_description"><p>The decodebin.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>child</p></td>
<td class="parameter_description"><p>The child element doing the query</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>pad</p></td>
<td class="parameter_description"><p>The <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstPad.html#GstPad-struct"><span class="type">GstPad</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>query</p></td>
<td class="parameter_description"><p>The <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstQuery.html#GstQuery-struct"><span class="type">GstQuery</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>user data set when the signal handler was connected.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="GstDecodeBin-autoplug-query.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 query was handled, <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> otherwise.</p>
</div>
<p>Flags: <a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS">Run Last</a></p>
</div>
<hr>
<div class="refsect2">
<a name="GstDecodeBin-autoplug-select"></a><h3>The <code class="literal">“autoplug-select”</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">GstAutoplugSelectResult</span>
user_function (<a class="link" href="gst-plugins-base-plugins-decodebin.html#GstDecodeBin"><span class="type">GstDecodeBin</span></a>      *bin,
               <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstPad.html#GstPad-struct"><span class="type">GstPad</span></a>            *pad,
               <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstCaps.html#GstCaps-struct"><span class="type">GstCaps</span></a>           *caps,
               <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstElementFactory.html#GstElementFactory-struct"><span class="type">GstElementFactory</span></a> *factory,
               <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a>           user_data)</pre>
<p>This signal is emitted once decodebin has found all the possible
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstElementFactory.html#GstElementFactory-struct"><span class="type">GstElementFactory</span></a> that can be used to handle the given <em class="parameter"><code>caps</code></em>
. For each of
those factories, this signal is emitted.</p>
<p>The signal handler should return a <span class="type">GST_TYPE_AUTOPLUG_SELECT_RESULT</span> enum
value indicating what decodebin should do next.</p>
<p>A value of <span class="type">GST_AUTOPLUG_SELECT_TRY</span> will try to autoplug an element from
<em class="parameter"><code>factory</code></em>
.</p>
<p>A value of <span class="type">GST_AUTOPLUG_SELECT_EXPOSE</span> will expose <em class="parameter"><code>pad</code></em>
 without plugging
any element to it.</p>
<p>A value of <span class="type">GST_AUTOPLUG_SELECT_SKIP</span> will skip <em class="parameter"><code>factory</code></em>
 and move to the
next factory.</p>
<div class="blockquote"><blockquote class="blockquote"><p>  The signal handler will not be invoked if any of the previously
  registered signal handlers (if any) return a value other than
  GST_AUTOPLUG_SELECT_TRY. Which also means that if you return
  GST_AUTOPLUG_SELECT_TRY from one signal handler, handlers that get
  registered next (again, if any) can override that decision.</p></blockquote></div>
<div class="refsect3">
<a name="GstDecodeBin-autoplug-select.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>bin</p></td>
<td class="parameter_description"><p>The decodebin.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>pad</p></td>
<td class="parameter_description"><p>The <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstPad.html#GstPad-struct"><span class="type">GstPad</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>caps</p></td>
<td class="parameter_description"><p>The <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstCaps.html#GstCaps-struct"><span class="type">GstCaps</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>factory</p></td>
<td class="parameter_description"><p>A <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstElementFactory.html#GstElementFactory-struct"><span class="type">GstElementFactory</span></a> to use.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>user data set when the signal handler was connected.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="GstDecodeBin-autoplug-select.returns"></a><h4>Returns</h4>
<p> a <span class="type">GST_TYPE_AUTOPLUG_SELECT_RESULT</span> that indicates the required
operation. the default handler will always return
<span class="type">GST_AUTOPLUG_SELECT_TRY</span>.</p>
</div>
<p>Flags: <a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS">Run Last</a></p>
</div>
<hr>
<div class="refsect2">
<a name="GstDecodeBin-autoplug-sort"></a><h3>The <code class="literal">“autoplug-sort”</code> signal</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gobject/gobject-Value-arrays.html#GValueArray-struct"><span class="returnvalue">GValueArray</span></a>*
user_function (<a class="link" href="gst-plugins-base-plugins-decodebin.html#GstDecodeBin"><span class="type">GstDecodeBin</span></a> *bin,
               <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstPad.html#GstPad-struct"><span class="type">GstPad</span></a>       *pad,
               <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstCaps.html#GstCaps-struct"><span class="type">GstCaps</span></a>      *caps,
               <a href="/usr/share/gtk-doc/html/gobject/gobject-Value-arrays.html#GValueArray-struct"><span class="type">GValueArray</span></a>  *factories,
               <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a>      user_data)</pre>
<p>Once decodebin has found the possible <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstElementFactory.html#GstElementFactory-struct"><span class="type">GstElementFactory</span></a> objects to try
for <em class="parameter"><code>caps</code></em>
 on <em class="parameter"><code>pad</code></em>
, this signal is emitted. The purpose of the signal is for
the application to perform additional sorting or filtering on the element
factory array.</p>
<p>The callee should copy and modify <em class="parameter"><code>factories</code></em>
 or return <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> if the
order should not change.</p>
<div class="blockquote"><blockquote class="blockquote"><p>  Invocation of signal handlers stops after one signal handler has
  returned something else than <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. Signal handlers are invoked in
  the order they were connected in.
  Don't connect signal handlers with the <a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-CONNECT-AFTER:CAPS"><span class="type">G_CONNECT_AFTER</span></a> flag to this
  signal, they will never be invoked!</p></blockquote></div>
<div class="refsect3">
<a name="GstDecodeBin-autoplug-sort.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>bin</p></td>
<td class="parameter_description"><p>The decodebin.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>pad</p></td>
<td class="parameter_description"><p>The <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstPad.html#GstPad-struct"><span class="type">GstPad</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>caps</p></td>
<td class="parameter_description"><p>The <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstCaps.html#GstCaps-struct"><span class="type">GstCaps</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>factories</p></td>
<td class="parameter_description"><p>A <a href="/usr/share/gtk-doc/html/gobject/gobject-Value-arrays.html#GValueArray-struct"><span class="type">GValueArray</span></a> of possible <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstElementFactory.html#GstElementFactory-struct"><span class="type">GstElementFactory</span></a> to use.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>user data set when the signal handler was connected.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="GstDecodeBin-autoplug-sort.returns"></a><h4>Returns</h4>
<p> A new sorted array of <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstElementFactory.html#GstElementFactory-struct"><span class="type">GstElementFactory</span></a> objects.</p>
</div>
<p>Flags: <a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS">Run Last</a></p>
</div>
<hr>
<div class="refsect2">
<a name="GstDecodeBin-drained"></a><h3>The <code class="literal">“drained”</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
user_function (<a class="link" href="gst-plugins-base-plugins-decodebin.html#GstDecodeBin"><span class="type">GstDecodeBin</span></a> *bin,
               <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a>      user_data)</pre>
<p>This signal is emitted once decodebin has finished decoding all the data.</p>
<div class="refsect3">
<a name="GstDecodeBin-drained.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>bin</p></td>
<td class="parameter_description"><p>The decodebin</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>user data set when the signal handler was connected.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p>Flags: <a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS">Run Last</a></p>
</div>
<hr>
<div class="refsect2">
<a name="GstDecodeBin-unknown-type"></a><h3>The <code class="literal">“unknown-type”</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
user_function (<a class="link" href="gst-plugins-base-plugins-decodebin.html#GstDecodeBin"><span class="type">GstDecodeBin</span></a> *bin,
               <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstPad.html#GstPad-struct"><span class="type">GstPad</span></a>       *pad,
               <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstCaps.html#GstCaps-struct"><span class="type">GstCaps</span></a>      *caps,
               <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a>      user_data)</pre>
<p>This signal is emitted when a pad for which there is no further possible
decoding is added to the decodebin.</p>
<div class="refsect3">
<a name="GstDecodeBin-unknown-type.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>bin</p></td>
<td class="parameter_description"><p>The decodebin.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>pad</p></td>
<td class="parameter_description"><p>The new pad containing caps that cannot be resolved to a 'final'
stream type.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>caps</p></td>
<td class="parameter_description"><p>The <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstCaps.html#GstCaps-struct"><span class="type">GstCaps</span></a> of the pad that cannot be resolved.</p></td>
<td class="parameter_annotations"> </td>
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<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>user data set when the signal handler was connected.</p></td>
<td class="parameter_annotations"> </td>
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<p>Flags: <a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS">Run Last</a></p>
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