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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<a href="#GstBin.synopsis" class="shortcut">Top</a>
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<a href="#GstBin.description" class="shortcut">Description</a>
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<a href="#GstBin.object-hierarchy" class="shortcut">Object Hierarchy</a>
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<a href="#GstBin.implemented-interfaces" class="shortcut">Implemented Interfaces</a>
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<div class="refentry">
<a name="GstBin"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle"><a name="GstBin.top_of_page"></a>GstBin</span></h2>
<p>GstBin — Base class and element that can contain other elements</p>
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<div class="refsynopsisdiv">
<a name="GstBin.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include <gst/gst.h>
struct <a class="link" href="GstBin.html#GstBin-struct" title="struct GstBin">GstBin</a>;
struct <a class="link" href="GstBin.html#GstBinClass" title="struct GstBinClass">GstBinClass</a>;
<a class="link" href="GstElement.html" title="GstElement"><span class="returnvalue">GstElement</span></a> * <a class="link" href="GstBin.html#gst-bin-new" title="gst_bin_new ()">gst_bin_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</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstBin.html#gst-bin-add" title="gst_bin_add ()">gst_bin_add</a> (<em class="parameter"><code><a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a> *bin</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstBin.html#gst-bin-remove" title="gst_bin_remove ()">gst_bin_remove</a> (<em class="parameter"><code><a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a> *bin</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>);
<a class="link" href="GstElement.html" title="GstElement"><span class="returnvalue">GstElement</span></a> * <a class="link" href="GstBin.html#gst-bin-get-by-name" title="gst_bin_get_by_name ()">gst_bin_get_by_name</a> (<em class="parameter"><code><a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a> *bin</code></em>,
<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</code></em>);
<a class="link" href="GstElement.html" title="GstElement"><span class="returnvalue">GstElement</span></a> * <a class="link" href="GstBin.html#gst-bin-get-by-name-recurse-up" title="gst_bin_get_by_name_recurse_up ()">gst_bin_get_by_name_recurse_up</a> (<em class="parameter"><code><a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a> *bin</code></em>,
<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</code></em>);
<a class="link" href="GstElement.html" title="GstElement"><span class="returnvalue">GstElement</span></a> * <a class="link" href="GstBin.html#gst-bin-get-by-interface" title="gst_bin_get_by_interface ()">gst_bin_get_by_interface</a> (<em class="parameter"><code><a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a> *bin</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/gobject/unstable/gobject-Type-Information.html#GType"><span class="type">GType</span></a> iface</code></em>);
<a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="returnvalue">GstIterator</span></a> * <a class="link" href="GstBin.html#gst-bin-iterate-elements" title="gst_bin_iterate_elements ()">gst_bin_iterate_elements</a> (<em class="parameter"><code><a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a> *bin</code></em>);
<a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="returnvalue">GstIterator</span></a> * <a class="link" href="GstBin.html#gst-bin-iterate-recurse" title="gst_bin_iterate_recurse ()">gst_bin_iterate_recurse</a> (<em class="parameter"><code><a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a> *bin</code></em>);
<a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="returnvalue">GstIterator</span></a> * <a class="link" href="GstBin.html#gst-bin-iterate-sinks" title="gst_bin_iterate_sinks ()">gst_bin_iterate_sinks</a> (<em class="parameter"><code><a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a> *bin</code></em>);
<a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="returnvalue">GstIterator</span></a> * <a class="link" href="GstBin.html#gst-bin-iterate-sorted" title="gst_bin_iterate_sorted ()">gst_bin_iterate_sorted</a> (<em class="parameter"><code><a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a> *bin</code></em>);
<a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="returnvalue">GstIterator</span></a> * <a class="link" href="GstBin.html#gst-bin-iterate-sources" title="gst_bin_iterate_sources ()">gst_bin_iterate_sources</a> (<em class="parameter"><code><a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a> *bin</code></em>);
<a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="returnvalue">GstIterator</span></a> * <a class="link" href="GstBin.html#gst-bin-iterate-all-by-interface" title="gst_bin_iterate_all_by_interface ()">gst_bin_iterate_all_by_interface</a> (<em class="parameter"><code><a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a> *bin</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/gobject/unstable/gobject-Type-Information.html#GType"><span class="type">GType</span></a> iface</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstBin.html#gst-bin-recalculate-latency" title="gst_bin_recalculate_latency ()">gst_bin_recalculate_latency</a> (<em class="parameter"><code><a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a> *bin</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GstBin.html#gst-bin-add-many" title="gst_bin_add_many ()">gst_bin_add_many</a> (<em class="parameter"><code><a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a> *bin</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element_1</code></em>,
<em class="parameter"><code>...</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GstBin.html#gst-bin-remove-many" title="gst_bin_remove_many ()">gst_bin_remove_many</a> (<em class="parameter"><code><a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a> *bin</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element_1</code></em>,
<em class="parameter"><code>...</code></em>);
<a class="link" href="GstPad.html" title="GstPad"><span class="returnvalue">GstPad</span></a> * <a class="link" href="GstBin.html#gst-bin-find-unlinked-pad" title="gst_bin_find_unlinked_pad ()">gst_bin_find_unlinked_pad</a> (<em class="parameter"><code><a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a> *bin</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>);
enum <a class="link" href="GstBin.html#GstBinFlags" title="enum GstBinFlags">GstBinFlags</a>;
#define <a class="link" href="GstBin.html#GST-BIN-IS-NO-RESYNC:CAPS" title="GST_BIN_IS_NO_RESYNC()">GST_BIN_IS_NO_RESYNC</a> (bin)
#define <a class="link" href="GstBin.html#GST-BIN-CHILDREN:CAPS" title="GST_BIN_CHILDREN()">GST_BIN_CHILDREN</a> (bin)
#define <a class="link" href="GstBin.html#GST-BIN-CHILDREN-COOKIE:CAPS" title="GST_BIN_CHILDREN_COOKIE()">GST_BIN_CHILDREN_COOKIE</a> (bin)
#define <a class="link" href="GstBin.html#GST-BIN-NUMCHILDREN:CAPS" title="GST_BIN_NUMCHILDREN()">GST_BIN_NUMCHILDREN</a> (bin)
</pre>
</div>
<div class="refsect1">
<a name="GstBin.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>
+----<a class="link" href="GstElement.html" title="GstElement">GstElement</a>
+----GstBin
+----<a class="link" href="GstPipeline.html" title="GstPipeline">GstPipeline</a>
</pre>
</div>
<div class="refsect1">
<a name="GstBin.implemented-interfaces"></a><h2>Implemented Interfaces</h2>
<p>
GstBin implements
<a class="link" href="GstChildProxy.html" title="GstChildProxy">GstChildProxy</a>.</p>
</div>
<div class="refsect1">
<a name="GstBin.properties"></a><h2>Properties</h2>
<pre class="synopsis">
"<a class="link" href="GstBin.html#GstBin--async-handling" title='The "async-handling" property'>async-handling</a>" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> : Read / Write
"<a class="link" href="GstBin.html#GstBin--message-forward" title='The "message-forward" property'>message-forward</a>" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> : Read / Write
</pre>
</div>
<div class="refsect1">
<a name="GstBin.signals"></a><h2>Signals</h2>
<pre class="synopsis">
"<a class="link" href="GstBin.html#GstBin-do-latency" title='The "do-latency" signal'>do-latency</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>
"<a class="link" href="GstBin.html#GstBin-element-added" title='The "element-added" signal'>element-added</a>" : <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Signals.html#G-SIGNAL-RUN-FIRST:CAPS"><code class="literal">Run First</code></a>
"<a class="link" href="GstBin.html#GstBin-element-removed" title='The "element-removed" signal'>element-removed</a>" : <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Signals.html#G-SIGNAL-RUN-FIRST:CAPS"><code class="literal">Run First</code></a>
</pre>
</div>
<div class="refsect1">
<a name="GstBin.description"></a><h2>Description</h2>
<p>
<a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a> is an element that can contain other <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a>, allowing them to be
managed as a group.
Pads from the child elements can be ghosted to the bin, see <a class="link" href="GstGhostPad.html" title="GstGhostPad"><span class="type">GstGhostPad</span></a>.
This makes the bin look like any other elements and enables creation of
higher-level abstraction elements.
</p>
<p>
A new <a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a> is created with <a class="link" href="GstBin.html#gst-bin-new" title="gst_bin_new ()"><code class="function">gst_bin_new()</code></a>. Use a <a class="link" href="GstPipeline.html" title="GstPipeline"><span class="type">GstPipeline</span></a> instead if you
want to create a toplevel bin because a normal bin doesn't have a bus or
handle clock distribution of its own.
</p>
<p>
After the bin has been created you will typically add elements to it with
<a class="link" href="GstBin.html#gst-bin-add" title="gst_bin_add ()"><code class="function">gst_bin_add()</code></a>. You can remove elements with <a class="link" href="GstBin.html#gst-bin-remove" title="gst_bin_remove ()"><code class="function">gst_bin_remove()</code></a>.
</p>
<p>
An element can be retrieved from a bin with <a class="link" href="GstBin.html#gst-bin-get-by-name" title="gst_bin_get_by_name ()"><code class="function">gst_bin_get_by_name()</code></a>, using the
elements name. <a class="link" href="GstBin.html#gst-bin-get-by-name-recurse-up" title="gst_bin_get_by_name_recurse_up ()"><code class="function">gst_bin_get_by_name_recurse_up()</code></a> is mainly used for internal
purposes and will query the parent bins when the element is not found in the
current bin.
</p>
<p>
An iterator of elements in a bin can be retrieved with
<a class="link" href="GstBin.html#gst-bin-iterate-elements" title="gst_bin_iterate_elements ()"><code class="function">gst_bin_iterate_elements()</code></a>. Various other iterators exist to retrieve the
elements in a bin.
</p>
<p>
<a class="link" href="GstObject.html#gst-object-unref" title="gst_object_unref ()"><code class="function">gst_object_unref()</code></a> is used to drop your reference to the bin.
</p>
<p>
The <a class="link" href="GstBin.html#GstBin-element-added" title='The "element-added" signal'><span class="type">"element-added"</span></a> signal is fired whenever a new element is added to
the bin. Likewise the <a class="link" href="GstBin.html#GstBin-element-removed" title='The "element-removed" signal'><span class="type">"element-removed"</span></a> signal is fired whenever an
element is removed from the bin.
</p>
<p>
</p>
<div class="refsect2">
<a name="id-1.3.6.8.9.1"></a><h3>Notes</h3>
<p>
A <a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a> internally intercepts every <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> posted by its children and
implements the following default behaviour for each of them:
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">GST_MESSAGE_EOS</span></p></td>
<td><p>This message is only posted by sinks in the PLAYING
state. If all sinks posted the EOS message, this bin will post and EOS
message upwards.</p></td>
</tr>
<tr>
<td><p><span class="term">GST_MESSAGE_SEGMENT_START</span></p></td>
<td><p>just collected and never forwarded upwards.
The messages are used to decide when all elements have completed playback
of their segment.</p></td>
</tr>
<tr>
<td><p><span class="term">GST_MESSAGE_SEGMENT_DONE</span></p></td>
<td><p> Is posted by <a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a> when all elements that posted
a SEGMENT_START have posted a SEGMENT_DONE.</p></td>
</tr>
<tr>
<td><p><span class="term">GST_MESSAGE_DURATION_CHANGED</span></p></td>
<td><p> Is posted by an element that detected a change
in the stream duration. The default bin behaviour is to clear any
cached duration values so that the next duration query will perform
a full duration recalculation. The duration change is posted to the
application so that it can refetch the new duration with a duration
query. Note that these messages can be posted before the bin is
prerolled, in which case the duration query might fail.
</p></td>
</tr>
<tr>
<td><p><span class="term">GST_MESSAGE_CLOCK_LOST</span></p></td>
<td><p> This message is posted by an element when it
can no longer provide a clock. The default bin behaviour is to
check if the lost clock was the one provided by the bin. If so and
the bin is currently in the PLAYING state, the message is forwarded to
the bin parent.
This message is also generated when a clock provider is removed from
the bin. If this message is received by the application, it should
PAUSE the pipeline and set it back to PLAYING to force a new clock
distribution.
</p></td>
</tr>
<tr>
<td><p><span class="term">GST_MESSAGE_CLOCK_PROVIDE</span></p></td>
<td><p> This message is generated when an element
can provide a clock. This mostly happens when a new clock
provider is added to the bin. The default behaviour of the bin is to
mark the currently selected clock as dirty, which will perform a clock
recalculation the next time the bin is asked to provide a clock.
This message is never sent tot the application but is forwarded to
the parent of the bin.
</p></td>
</tr>
<tr>
<td><p><span class="term">OTHERS</span></p></td>
<td><p> posted upwards.</p></td>
</tr>
</tbody>
</table></div>
<p>
</p>
<p>
A <a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a> implements the following default behaviour for answering to a
<a class="link" href="gstreamer-GstQuery.html#GstQuery" title="struct GstQuery"><span class="type">GstQuery</span></a>:
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">GST_QUERY_DURATION</span></p></td>
<td><p>If the query has been asked before with the same format
and the bin is a toplevel bin (ie. has no parent),
use the cached previous value. If no previous value was cached, the
query is sent to all sink elements in the bin and the MAXIMUM of all
values is returned. If the bin is a toplevel bin the value is cached.
If no sinks are available in the bin, the query fails.
</p></td>
</tr>
<tr>
<td><p><span class="term">GST_QUERY_POSITION</span></p></td>
<td><p>The query is sent to all sink elements in the bin and the
MAXIMUM of all values is returned. If no sinks are available in the bin,
the query fails.
</p></td>
</tr>
<tr>
<td><p><span class="term">OTHERS</span></p></td>
<td><p>the query is forwarded to all sink elements, the result
of the first sink that answers the query successfully is returned. If no
sink is in the bin, the query fails.</p></td>
</tr>
</tbody>
</table></div>
<p>
</p>
<p>
A <a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a> will by default forward any event sent to it to all sink elements.
If all the sinks return TRUE, the bin will also return TRUE, else FALSE is
returned. If no sinks are in the bin, the event handler will return TRUE.
</p>
<p>
</p>
</div>
<p>
</p>
<p>
Last reviewed on 2012-03-28 (0.11.3)
</p>
</div>
<div class="refsect1">
<a name="GstBin.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GstBin-struct"></a><h3>struct GstBin</h3>
<pre class="programlisting">struct GstBin {
/* our children, subclass are supposed to update these
* fields to reflect their state with _iterate_*() */
gint numchildren;
GList *children;
guint32 children_cookie;
GstBus *child_bus;
GList *messages;
gboolean polling;
gboolean state_dirty;
gboolean clock_dirty;
GstClock *provided_clock;
GstElement *clock_provider;
};
</pre>
<p>
The GstBin base class. Subclasses can access these fields provided
the LOCK is taken.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> <em class="structfield"><code><a name="GstBin-struct.numchildren"></a>numchildren</code></em>;</span></p></td>
<td>the number of children in this bin</td>
</tr>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Doubly-Linked-Lists.html#GList"><span class="type">GList</span></a> *<em class="structfield"><code><a name="GstBin-struct.children"></a>children</code></em>;</span></p></td>
<td>the list of children in this bin. <span class="annotation">[<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> Gst.Element]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">guint32</span> <em class="structfield"><code><a name="GstBin-struct.children-cookie"></a>children_cookie</code></em>;</span></p></td>
<td>updated whenever <em class="parameter"><code>children</code></em> changes</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="GstBus.html" title="GstBus"><span class="type">GstBus</span></a> *<em class="structfield"><code><a name="GstBin-struct.child-bus"></a>child_bus</code></em>;</span></p></td>
<td>internal bus for handling child messages</td>
</tr>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Doubly-Linked-Lists.html#GList"><span class="type">GList</span></a> *<em class="structfield"><code><a name="GstBin-struct.messages"></a>messages</code></em>;</span></p></td>
<td>queued and cached messages. <span class="annotation">[<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> Gst.Message]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> <em class="structfield"><code><a name="GstBin-struct.polling"></a>polling</code></em>;</span></p></td>
<td>the bin is currently calculating its state</td>
</tr>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> <em class="structfield"><code><a name="GstBin-struct.state-dirty"></a>state_dirty</code></em>;</span></p></td>
<td>the bin needs to recalculate its state (deprecated)</td>
</tr>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> <em class="structfield"><code><a name="GstBin-struct.clock-dirty"></a>clock_dirty</code></em>;</span></p></td>
<td>the bin needs to select a new clock</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> *<em class="structfield"><code><a name="GstBin-struct.provided-clock"></a>provided_clock</code></em>;</span></p></td>
<td>the last clock selected</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *<em class="structfield"><code><a name="GstBin-struct.clock-provider"></a>clock_provider</code></em>;</span></p></td>
<td>the element that provided <em class="parameter"><code>provided_clock</code></em>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstBinClass"></a><h3>struct GstBinClass</h3>
<pre class="programlisting">struct GstBinClass {
GstElementClass parent_class;
/* virtual methods for subclasses */
gboolean (*add_element) (GstBin *bin, GstElement *element);
gboolean (*remove_element) (GstBin *bin, GstElement *element);
void (*handle_message) (GstBin *bin, GstMessage *message);
};
</pre>
<p>
Subclasses can override the <em class="parameter"><code>add_element</code></em> and <em class="parameter"><code>remove_element</code></em> to
update the list of children in the bin.
</p>
<p>
The <em class="parameter"><code>handle_message</code></em> method can be overridden to implement custom
message handling. <em class="parameter"><code>handle_message</code></em> takes ownership of the message, just like
<a class="link" href="GstElement.html#gst-element-post-message" title="gst_element_post_message ()"><span class="type">gst_element_post_message</span></a>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><a class="link" href="GstElement.html#GstElementClass" title="struct GstElementClass"><span class="type">GstElementClass</span></a> <em class="structfield"><code><a name="GstBinClass.parent-class"></a>parent_class</code></em>;</span></p></td>
<td>bin parent class</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstBinClass.add-element"></a>add_element</code></em> ()</span></p></td>
<td>method to add an element to a bin</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstBinClass.remove-element"></a>remove_element</code></em> ()</span></p></td>
<td>method to remove an element from a bin</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstBinClass.handle-message"></a>handle_message</code></em> ()</span></p></td>
<td>method to handle a message from the children</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-bin-new"></a><h3>gst_bin_new ()</h3>
<pre class="programlisting"><a class="link" href="GstElement.html" title="GstElement"><span class="returnvalue">GstElement</span></a> * gst_bin_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</code></em>);</pre>
<p>
Creates a new bin with the given name.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
<td>the name of the new bin</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="GstBin.html" title="GstBin"><span class="type">GstBin</span></a>. <span class="annotation">[<acronym title="Alias for transfer none, used for objects with floating refs."><span class="acronym">transfer floating</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-bin-add"></a><h3>gst_bin_add ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_bin_add (<em class="parameter"><code><a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a> *bin</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>);</pre>
<p>
Adds the given element to the bin. Sets the element's parent, and thus
takes ownership of the element. An element can only be added to one bin.
</p>
<p>
If the element's pads are linked to other pads, the pads will be unlinked
before the element is added to the bin.
</p>
<p>
</p>
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
<h3 class="title">Note</h3>
When you add an element to an already-running pipeline, you will have to
take care to set the state of the newly-added element to the desired
state (usually PLAYING or PAUSED, same you set the pipeline to originally)
with <a class="link" href="GstElement.html#gst-element-set-state" title="gst_element_set_state ()"><code class="function">gst_element_set_state()</code></a>, or use <a class="link" href="GstElement.html#gst-element-sync-state-with-parent" title="gst_element_sync_state_with_parent ()"><code class="function">gst_element_sync_state_with_parent()</code></a>.
The bin or pipeline will not take care of this for you.
</div>
<p>
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>bin</code></em> :</span></p></td>
<td>a <a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>element</code></em> :</span></p></td>
<td>the <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to add. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the element could be added, FALSE if
the bin does not want to accept the element.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-bin-remove"></a><h3>gst_bin_remove ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_bin_remove (<em class="parameter"><code><a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a> *bin</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>);</pre>
<p>
Removes the element from the bin, unparenting it as well.
Unparenting the element means that the element will be dereferenced,
so if the bin holds the only reference to the element, the element
will be freed in the process of removing it from the bin. If you
want the element to still exist after removing, you need to call
<a class="link" href="GstObject.html#gst-object-ref" title="gst_object_ref ()"><code class="function">gst_object_ref()</code></a> before removing it from the bin.
</p>
<p>
If the element's pads are linked to other pads, the pads will be unlinked
before the element is removed from the bin.
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>bin</code></em> :</span></p></td>
<td>a <a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>element</code></em> :</span></p></td>
<td>the <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to remove. <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>TRUE if the element could be removed, FALSE if
the bin does not want to remove the element.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-bin-get-by-name"></a><h3>gst_bin_get_by_name ()</h3>
<pre class="programlisting"><a class="link" href="GstElement.html" title="GstElement"><span class="returnvalue">GstElement</span></a> * gst_bin_get_by_name (<em class="parameter"><code><a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a> *bin</code></em>,
<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</code></em>);</pre>
<p>
Gets the element with the given name from a bin. This
function recurses into child bins.
</p>
<p>
Returns NULL if no element with the given name is found in the bin.
</p>
<p>
MT safe. Caller owns returned reference.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>bin</code></em> :</span></p></td>
<td>a <a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
<td>the element name to search for</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> with the given name, or NULL. <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-bin-get-by-name-recurse-up"></a><h3>gst_bin_get_by_name_recurse_up ()</h3>
<pre class="programlisting"><a class="link" href="GstElement.html" title="GstElement"><span class="returnvalue">GstElement</span></a> * gst_bin_get_by_name_recurse_up (<em class="parameter"><code><a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a> *bin</code></em>,
<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</code></em>);</pre>
<p>
Gets the element with the given name from this bin. If the
element is not found, a recursion is performed on the parent bin.
</p>
<p>
Returns NULL if:
</p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p>no element with the given name is found in the bin</p></li></ul></div>
<p>
</p>
<p>
MT safe. Caller owns returned reference.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>bin</code></em> :</span></p></td>
<td>a <a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
<td>the element name to search for</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> with the given name, or NULL. <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-bin-get-by-interface"></a><h3>gst_bin_get_by_interface ()</h3>
<pre class="programlisting"><a class="link" href="GstElement.html" title="GstElement"><span class="returnvalue">GstElement</span></a> * gst_bin_get_by_interface (<em class="parameter"><code><a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a> *bin</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/gobject/unstable/gobject-Type-Information.html#GType"><span class="type">GType</span></a> iface</code></em>);</pre>
<p>
Looks for an element inside the bin that implements the given
interface. If such an element is found, it returns the element.
You can cast this element to the given interface afterwards. If you want
all elements that implement the interface, use
<a class="link" href="GstBin.html#gst-bin-iterate-all-by-interface" title="gst_bin_iterate_all_by_interface ()"><code class="function">gst_bin_iterate_all_by_interface()</code></a>. This function recurses into child bins.
</p>
<p>
MT safe. Caller owns returned reference.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>bin</code></em> :</span></p></td>
<td>a <a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>iface</code></em> :</span></p></td>
<td>the <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Type-Information.html#GType"><span class="type">GType</span></a> of an interface</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> inside the bin implementing the interface. <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-bin-iterate-elements"></a><h3>gst_bin_iterate_elements ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="returnvalue">GstIterator</span></a> * gst_bin_iterate_elements (<em class="parameter"><code><a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a> *bin</code></em>);</pre>
<p>
Gets an iterator for the elements in this bin.
</p>
<p>
MT safe. Caller owns returned value.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>bin</code></em> :</span></p></td>
<td>a <a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a <a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="type">GstIterator</span></a> of <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a>, or NULL. <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-bin-iterate-recurse"></a><h3>gst_bin_iterate_recurse ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="returnvalue">GstIterator</span></a> * gst_bin_iterate_recurse (<em class="parameter"><code><a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a> *bin</code></em>);</pre>
<p>
Gets an iterator for the elements in this bin.
This iterator recurses into GstBin children.
</p>
<p>
MT safe. Caller owns returned value.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>bin</code></em> :</span></p></td>
<td>a <a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a <a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="type">GstIterator</span></a> of <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a>, or NULL. <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-bin-iterate-sinks"></a><h3>gst_bin_iterate_sinks ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="returnvalue">GstIterator</span></a> * gst_bin_iterate_sinks (<em class="parameter"><code><a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a> *bin</code></em>);</pre>
<p>
Gets an iterator for all elements in the bin that have the
<a class="link" href="GstElement.html#GST-ELEMENT-FLAG-SINK:CAPS"><span class="type">GST_ELEMENT_FLAG_SINK</span></a> flag set.
</p>
<p>
MT safe. Caller owns returned value.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>bin</code></em> :</span></p></td>
<td>a <a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a <a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="type">GstIterator</span></a> of <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a>, or NULL. <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-bin-iterate-sorted"></a><h3>gst_bin_iterate_sorted ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="returnvalue">GstIterator</span></a> * gst_bin_iterate_sorted (<em class="parameter"><code><a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a> *bin</code></em>);</pre>
<p>
Gets an iterator for the elements in this bin in topologically
sorted order. This means that the elements are returned from
the most downstream elements (sinks) to the sources.
</p>
<p>
This function is used internally to perform the state changes
of the bin elements and for clock selection.
</p>
<p>
MT safe. Caller owns returned value.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>bin</code></em> :</span></p></td>
<td>a <a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a <a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="type">GstIterator</span></a> of <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a>, or NULL. <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-bin-iterate-sources"></a><h3>gst_bin_iterate_sources ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="returnvalue">GstIterator</span></a> * gst_bin_iterate_sources (<em class="parameter"><code><a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a> *bin</code></em>);</pre>
<p>
Gets an iterator for all elements in the bin that have the
<a class="link" href="GstElement.html#GST-ELEMENT-FLAG-SOURCE:CAPS"><span class="type">GST_ELEMENT_FLAG_SOURCE</span></a> flag set.
</p>
<p>
MT safe. Caller owns returned value.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>bin</code></em> :</span></p></td>
<td>a <a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a <a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="type">GstIterator</span></a> of <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a>, or NULL. <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-bin-iterate-all-by-interface"></a><h3>gst_bin_iterate_all_by_interface ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="returnvalue">GstIterator</span></a> * gst_bin_iterate_all_by_interface (<em class="parameter"><code><a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a> *bin</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/gobject/unstable/gobject-Type-Information.html#GType"><span class="type">GType</span></a> iface</code></em>);</pre>
<p>
Looks for all elements inside the bin that implements the given
interface. You can safely cast all returned elements to the given interface.
The function recurses inside child bins. The iterator will yield a series
of <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> that should be unreffed after use.
</p>
<p>
MT safe. Caller owns returned value.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>bin</code></em> :</span></p></td>
<td>a <a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>iface</code></em> :</span></p></td>
<td>the <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Type-Information.html#GType"><span class="type">GType</span></a> of an interface</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a <a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="type">GstIterator</span></a> of <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> for all elements
in the bin implementing the given interface, or NULL. <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-bin-recalculate-latency"></a><h3>gst_bin_recalculate_latency ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_bin_recalculate_latency (<em class="parameter"><code><a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a> *bin</code></em>);</pre>
<p>
Query <em class="parameter"><code>bin</code></em> for the current latency using and reconfigures this latency to all the
elements with a LATENCY event.
</p>
<p>
This method is typically called on the pipeline when a <a class="link" href="gstreamer-GstMessage.html#GST-MESSAGE-LATENCY:CAPS"><span class="type">GST_MESSAGE_LATENCY</span></a>
is posted on the bus.
</p>
<p>
This function simply emits the 'do-latency' signal so any custom latency
calculations will be performed.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>bin</code></em> :</span></p></td>
<td>a <a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the latency could be queried and reconfigured.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-bin-add-many"></a><h3>gst_bin_add_many ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_bin_add_many (<em class="parameter"><code><a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a> *bin</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element_1</code></em>,
<em class="parameter"><code>...</code></em>);</pre>
<p>
Adds a NULL-terminated list of elements to a bin. This function is
equivalent to calling <a class="link" href="GstBin.html#gst-bin-add" title="gst_bin_add ()"><code class="function">gst_bin_add()</code></a> for each member of the list. The return
value of each <a class="link" href="GstBin.html#gst-bin-add" title="gst_bin_add ()"><code class="function">gst_bin_add()</code></a> is ignored.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>bin</code></em> :</span></p></td>
<td>a <a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>element_1</code></em> :</span></p></td>
<td>the <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> element to add to the bin. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>...</code></em> :</span></p></td>
<td>additional elements to add to the bin. <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-bin-remove-many"></a><h3>gst_bin_remove_many ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_bin_remove_many (<em class="parameter"><code><a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a> *bin</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element_1</code></em>,
<em class="parameter"><code>...</code></em>);</pre>
<p>
Remove a list of elements from a bin. This function is equivalent
to calling <a class="link" href="GstBin.html#gst-bin-remove" title="gst_bin_remove ()"><code class="function">gst_bin_remove()</code></a> with each member of the list.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>bin</code></em> :</span></p></td>
<td>a <a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>element_1</code></em> :</span></p></td>
<td>the first <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to remove from the bin. <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"><em class="parameter"><code>...</code></em> :</span></p></td>
<td>NULL-terminated list of elements to remove from the bin. <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>
<hr>
<div class="refsect2">
<a name="gst-bin-find-unlinked-pad"></a><h3>gst_bin_find_unlinked_pad ()</h3>
<pre class="programlisting"><a class="link" href="GstPad.html" title="GstPad"><span class="returnvalue">GstPad</span></a> * gst_bin_find_unlinked_pad (<em class="parameter"><code><a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a> *bin</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>);</pre>
<p>
Recursively looks for elements with an unlinked pad of the given
direction within the specified bin and returns an unlinked pad
if one is found, or NULL otherwise. If a pad is found, the caller
owns a reference to it and should use <a class="link" href="GstObject.html#gst-object-unref" title="gst_object_unref ()"><code class="function">gst_object_unref()</code></a> on the
pad when it is not needed any longer.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>bin</code></em> :</span></p></td>
<td>bin in which to look for elements with unlinked pads</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>direction</code></em> :</span></p></td>
<td>whether to look for an unlinked source or sink pad</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>unlinked pad of the given direction, or NULL. <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="GstBinFlags"></a><h3>enum GstBinFlags</h3>
<pre class="programlisting">typedef enum {
GST_BIN_FLAG_NO_RESYNC = (GST_ELEMENT_FLAG_LAST << 0),
/* padding */
GST_BIN_FLAG_LAST = (GST_ELEMENT_FLAG_LAST << 5)
} GstBinFlags;
</pre>
<p>
GstBinFlags are a set of flags specific to bins. Most are set/used
internally. They can be checked using the <a class="link" href="GstObject.html#GST-OBJECT-FLAG-IS-SET:CAPS" title="GST_OBJECT_FLAG_IS_SET()"><code class="function">GST_OBJECT_FLAG_IS_SET()</code></a> macro,
and (un)set using <a class="link" href="GstObject.html#GST-OBJECT-FLAG-SET:CAPS" title="GST_OBJECT_FLAG_SET()"><code class="function">GST_OBJECT_FLAG_SET()</code></a> and <a class="link" href="GstObject.html#GST-OBJECT-FLAG-UNSET:CAPS" title="GST_OBJECT_FLAG_UNSET()"><code class="function">GST_OBJECT_FLAG_UNSET()</code></a>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><a name="GST-BIN-FLAG-NO-RESYNC:CAPS"></a><span class="term"><code class="literal">GST_BIN_FLAG_NO_RESYNC</code></span></p></td>
<td>don't resync a state change when elements are
added or linked in the bin.
</td>
</tr>
<tr>
<td><p><a name="GST-BIN-FLAG-LAST:CAPS"></a><span class="term"><code class="literal">GST_BIN_FLAG_LAST</code></span></p></td>
<td>the last enum in the series of flags for bins.
Derived classes can use this as first value in a list of flags.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-BIN-IS-NO-RESYNC:CAPS"></a><h3>GST_BIN_IS_NO_RESYNC()</h3>
<pre class="programlisting">#define GST_BIN_IS_NO_RESYNC(bin) (GST_OBJECT_FLAG_IS_SET(bin,GST_BIN_FLAG_NO_RESYNC))
</pre>
<p>
Check if <em class="parameter"><code>bin</code></em> will resync its state change when elements are added and
removed.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>bin</code></em> :</span></p></td>
<td>A <a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a>
</td>
</tr></tbody>
</table></div>
<p class="since">Since 1.1.1</p>
</div>
<hr>
<div class="refsect2">
<a name="GST-BIN-CHILDREN:CAPS"></a><h3>GST_BIN_CHILDREN()</h3>
<pre class="programlisting">#define GST_BIN_CHILDREN(bin) (GST_BIN_CAST(bin)->children)
</pre>
<p>
Gets the list with children in a bin.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>bin</code></em> :</span></p></td>
<td>a <a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a>
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-BIN-CHILDREN-COOKIE:CAPS"></a><h3>GST_BIN_CHILDREN_COOKIE()</h3>
<pre class="programlisting">#define GST_BIN_CHILDREN_COOKIE(bin) (GST_BIN_CAST(bin)->children_cookie)
</pre>
<p>
Gets the children cookie that watches the children list.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>bin</code></em> :</span></p></td>
<td>a <a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a>
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-BIN-NUMCHILDREN:CAPS"></a><h3>GST_BIN_NUMCHILDREN()</h3>
<pre class="programlisting">#define GST_BIN_NUMCHILDREN(bin) (GST_BIN_CAST(bin)->numchildren)
</pre>
<p>
Gets the number of children in a bin.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>bin</code></em> :</span></p></td>
<td>a <a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a>
</td>
</tr></tbody>
</table></div>
</div>
</div>
<div class="refsect1">
<a name="GstBin.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="GstBin--async-handling"></a><h3>The <code class="literal">"async-handling"</code> property</h3>
<pre class="programlisting"> "async-handling" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> : Read / Write</pre>
<p>
If set to <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><span class="type">TRUE</span></a>, the bin will handle asynchronous state changes.
This should be used only if the bin subclass is modifying the state
of its children on its own.
</p>
<p>Default value: FALSE</p>
</div>
<hr>
<div class="refsect2">
<a name="GstBin--message-forward"></a><h3>The <code class="literal">"message-forward"</code> property</h3>
<pre class="programlisting"> "message-forward" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> : Read / Write</pre>
<p>
Forward all children messages, even those that would normally be filtered by
the bin. This can be interesting when one wants to be notified of the EOS
state of individual elements, for example.
</p>
<p>
The messages are converted to an ELEMENT message with the bin as the
source. The structure of the message is named 'GstBinForwarded' and contains
a field named 'message' of type GST_TYPE_MESSAGE that contains the original
forwarded message.
</p>
<p>Default value: FALSE</p>
</div>
</div>
<div class="refsect1">
<a name="GstBin.signal-details"></a><h2>Signal Details</h2>
<div class="refsect2">
<a name="GstBin-do-latency"></a><h3>The <code class="literal">"do-latency"</code> signal</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> user_function (<a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a> *bin,
<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>
Will be emitted when the bin needs to perform latency calculations. This
signal is only emited for toplevel bins or when async-handling is
enabled.
</p>
<p>
Only one signal handler is invoked. If no signals are connected, the
default handler is invoked, which will query and distribute the lowest
possible latency to all sinks.
</p>
<p>
Connect to this signal if the default latency calculations are not
sufficient, like when you need different latencies for different sinks in
the same pipeline.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>bin</code></em> :</span></p></td>
<td>the <a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a>
</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>
<hr>
<div class="refsect2">
<a name="GstBin-element-added"></a><h3>The <code class="literal">"element-added"</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">void</span> user_function (<a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a> *bin,
<a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element,
<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-FIRST:CAPS"><code class="literal">Run First</code></a></pre>
<p>
Will be emitted after the element was added to the bin.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>bin</code></em> :</span></p></td>
<td>the <a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>element</code></em> :</span></p></td>
<td>the <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> that was added to the bin</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>
<hr>
<div class="refsect2">
<a name="GstBin-element-removed"></a><h3>The <code class="literal">"element-removed"</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">void</span> user_function (<a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a> *bin,
<a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element,
<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-FIRST:CAPS"><code class="literal">Run First</code></a></pre>
<p>
Will be emitted after the element was removed from the bin.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>bin</code></em> :</span></p></td>
<td>the <a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>element</code></em> :</span></p></td>
<td>the <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> that was removed from the bin</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>
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