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<h2><span class="refentrytitle"><a name="GstElement.top_of_page"></a>GstElement</span></h2>
<p>GstElement — Abstract base class for all pipeline elements</p>
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<a name="GstElement.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include <gst/gst.h>
struct <a class="link" href="GstElement.html#GstElement-struct" title="struct GstElement">GstElement</a>;
struct <a class="link" href="GstElement.html#GstElementClass" title="struct GstElementClass">GstElementClass</a>;
enum <a class="link" href="GstElement.html#GstElementFlags" title="enum GstElementFlags">GstElementFlags</a>;
enum <a class="link" href="GstElement.html#GstState" title="enum GstState">GstState</a>;
enum <a class="link" href="GstElement.html#GstStateChange" title="enum GstStateChange">GstStateChange</a>;
enum <a class="link" href="GstElement.html#GstStateChangeReturn" title="enum GstStateChangeReturn">GstStateChangeReturn</a>;
#define <a class="link" href="GstElement.html#GST-STATE:CAPS" title="GST_STATE()">GST_STATE</a> (elem)
#define <a class="link" href="GstElement.html#GST-STATE-GET-NEXT:CAPS" title="GST_STATE_GET_NEXT()">GST_STATE_GET_NEXT</a> (cur,
pending)
#define <a class="link" href="GstElement.html#GST-STATE-NEXT:CAPS" title="GST_STATE_NEXT()">GST_STATE_NEXT</a> (elem)
#define <a class="link" href="GstElement.html#GST-STATE-PENDING:CAPS" title="GST_STATE_PENDING()">GST_STATE_PENDING</a> (elem)
#define <a class="link" href="GstElement.html#GST-STATE-RETURN:CAPS" title="GST_STATE_RETURN()">GST_STATE_RETURN</a> (elem)
#define <a class="link" href="GstElement.html#GST-STATE-TARGET:CAPS" title="GST_STATE_TARGET()">GST_STATE_TARGET</a> (elem)
#define <a class="link" href="GstElement.html#GST-STATE-TRANSITION:CAPS" title="GST_STATE_TRANSITION()">GST_STATE_TRANSITION</a> (cur,
next)
#define <a class="link" href="GstElement.html#GST-STATE-TRANSITION-CURRENT:CAPS" title="GST_STATE_TRANSITION_CURRENT()">GST_STATE_TRANSITION_CURRENT</a> (trans)
#define <a class="link" href="GstElement.html#GST-STATE-TRANSITION-NEXT:CAPS" title="GST_STATE_TRANSITION_NEXT()">GST_STATE_TRANSITION_NEXT</a> (trans)
#define <a class="link" href="GstElement.html#GST-STATE-GET-LOCK:CAPS" title="GST_STATE_GET_LOCK()">GST_STATE_GET_LOCK</a> (elem)
#define <a class="link" href="GstElement.html#GST-STATE-GET-COND:CAPS" title="GST_STATE_GET_COND()">GST_STATE_GET_COND</a> (elem)
#define <a class="link" href="GstElement.html#GST-ELEMENT-NAME:CAPS" title="GST_ELEMENT_NAME()">GST_ELEMENT_NAME</a> (elem)
#define <a class="link" href="GstElement.html#GST-ELEMENT-PARENT:CAPS" title="GST_ELEMENT_PARENT()">GST_ELEMENT_PARENT</a> (elem)
#define <a class="link" href="GstElement.html#GST-ELEMENT-BUS:CAPS" title="GST_ELEMENT_BUS()">GST_ELEMENT_BUS</a> (elem)
#define <a class="link" href="GstElement.html#GST-ELEMENT-CLOCK:CAPS" title="GST_ELEMENT_CLOCK()">GST_ELEMENT_CLOCK</a> (elem)
#define <a class="link" href="GstElement.html#GST-ELEMENT-PADS:CAPS" title="GST_ELEMENT_PADS()">GST_ELEMENT_PADS</a> (elem)
#define <a class="link" href="GstElement.html#GST-ELEMENT-START-TIME:CAPS" title="GST_ELEMENT_START_TIME()">GST_ELEMENT_START_TIME</a> (elem)
#define <a class="link" href="GstElement.html#GST-ELEMENT-ERROR:CAPS" title="GST_ELEMENT_ERROR()">GST_ELEMENT_ERROR</a> (el,
domain,
code,
text,
debug)
#define <a class="link" href="GstElement.html#GST-ELEMENT-WARNING:CAPS" title="GST_ELEMENT_WARNING()">GST_ELEMENT_WARNING</a> (el,
domain,
code,
text,
debug)
#define <a class="link" href="GstElement.html#GST-ELEMENT-INFO:CAPS" title="GST_ELEMENT_INFO()">GST_ELEMENT_INFO</a> (el,
domain,
code,
text,
debug)
#define <a class="link" href="GstElement.html#GST-ELEMENT-IS-LOCKED-STATE:CAPS" title="GST_ELEMENT_IS_LOCKED_STATE()">GST_ELEMENT_IS_LOCKED_STATE</a> (elem)
#define <a class="link" href="GstElement.html#GST-ELEMENT-METADATA-AUTHOR:CAPS" title="GST_ELEMENT_METADATA_AUTHOR">GST_ELEMENT_METADATA_AUTHOR</a>
#define <a class="link" href="GstElement.html#GST-ELEMENT-METADATA-DESCRIPTION:CAPS" title="GST_ELEMENT_METADATA_DESCRIPTION">GST_ELEMENT_METADATA_DESCRIPTION</a>
#define <a class="link" href="GstElement.html#GST-ELEMENT-METADATA-DOC-URI:CAPS" title="GST_ELEMENT_METADATA_DOC_URI">GST_ELEMENT_METADATA_DOC_URI</a>
#define <a class="link" href="GstElement.html#GST-ELEMENT-METADATA-ICON-NAME:CAPS" title="GST_ELEMENT_METADATA_ICON_NAME">GST_ELEMENT_METADATA_ICON_NAME</a>
#define <a class="link" href="GstElement.html#GST-ELEMENT-METADATA-KLASS:CAPS" title="GST_ELEMENT_METADATA_KLASS">GST_ELEMENT_METADATA_KLASS</a>
#define <a class="link" href="GstElement.html#GST-ELEMENT-METADATA-LONGNAME:CAPS" title="GST_ELEMENT_METADATA_LONGNAME">GST_ELEMENT_METADATA_LONGNAME</a>
<span class="returnvalue">void</span> <a class="link" href="GstElement.html#gst-element-class-add-pad-template" title="gst_element_class_add_pad_template ()">gst_element_class_add_pad_template</a> (<em class="parameter"><code><a class="link" href="GstElement.html#GstElementClass" title="struct GstElementClass"><span class="type">GstElementClass</span></a> *klass</code></em>,
<em class="parameter"><code><a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="type">GstPadTemplate</span></a> *templ</code></em>);
<a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="returnvalue">GstPadTemplate</span></a> * <a class="link" href="GstElement.html#gst-element-class-get-pad-template" title="gst_element_class_get_pad_template ()">gst_element_class_get_pad_template</a> (<em class="parameter"><code><a class="link" href="GstElement.html#GstElementClass" title="struct GstElementClass"><span class="type">GstElementClass</span></a> *element_class</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 href="http://library.gnome.org/devel/glib/unstable/glib-Doubly-Linked-Lists.html#GList"><span class="returnvalue">GList</span></a> * <a class="link" href="GstElement.html#gst-element-class-get-pad-template-list" title="gst_element_class_get_pad_template_list ()">gst_element_class_get_pad_template_list</a>
(<em class="parameter"><code><a class="link" href="GstElement.html#GstElementClass" title="struct GstElementClass"><span class="type">GstElementClass</span></a> *element_class</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GstElement.html#gst-element-class-set-metadata" title="gst_element_class_set_metadata ()">gst_element_class_set_metadata</a> (<em class="parameter"><code><a class="link" href="GstElement.html#GstElementClass" title="struct GstElementClass"><span class="type">GstElementClass</span></a> *klass</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> *longname</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> *classification</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> *description</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> *author</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GstElement.html#gst-element-class-set-static-metadata" title="gst_element_class_set_static_metadata ()">gst_element_class_set_static_metadata</a>
(<em class="parameter"><code><a class="link" href="GstElement.html#GstElementClass" title="struct GstElementClass"><span class="type">GstElementClass</span></a> *klass</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> *longname</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> *classification</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> *description</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> *author</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GstElement.html#gst-element-class-add-metadata" title="gst_element_class_add_metadata ()">gst_element_class_add_metadata</a> (<em class="parameter"><code><a class="link" href="GstElement.html#GstElementClass" title="struct GstElementClass"><span class="type">GstElementClass</span></a> *klass</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> *key</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> *value</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GstElement.html#gst-element-class-add-static-metadata" title="gst_element_class_add_static_metadata ()">gst_element_class_add_static_metadata</a>
(<em class="parameter"><code><a class="link" href="GstElement.html#GstElementClass" title="struct GstElementClass"><span class="type">GstElementClass</span></a> *klass</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> *key</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> *value</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="GstElement.html#gst-element-add-pad" title="gst_element_add_pad ()">gst_element_add_pad</a> (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GstElement.html#gst-element-create-all-pads" title="gst_element_create_all_pads ()">gst_element_create_all_pads</a> (<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="GstPad.html" title="GstPad"><span class="returnvalue">GstPad</span></a> * <a class="link" href="GstElement.html#gst-element-get-compatible-pad" title="gst_element_get_compatible_pad ()">gst_element_get_compatible_pad</a> (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="type">GstCaps</span></a> *caps</code></em>);
<a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="returnvalue">GstPadTemplate</span></a> * <a class="link" href="GstElement.html#gst-element-get-compatible-pad-template" title="gst_element_get_compatible_pad_template ()">gst_element_get_compatible_pad_template</a>
(<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="type">GstPadTemplate</span></a> *compattempl</code></em>);
<a class="link" href="GstPad.html" title="GstPad"><span class="returnvalue">GstPad</span></a> * <a class="link" href="GstElement.html#gst-element-get-request-pad" title="gst_element_get_request_pad ()">gst_element_get_request_pad</a> (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</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="GstPad.html" title="GstPad"><span class="returnvalue">GstPad</span></a> * <a class="link" href="GstElement.html#gst-element-get-static-pad" title="gst_element_get_static_pad ()">gst_element_get_static_pad</a> (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</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="GstPad.html" title="GstPad"><span class="returnvalue">GstPad</span></a> * <a class="link" href="GstElement.html#gst-element-request-pad" title="gst_element_request_pad ()">gst_element_request_pad</a> (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="type">GstPadTemplate</span></a> *templ</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>,
<em class="parameter"><code>const <a class="link" href="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="type">GstCaps</span></a> *caps</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GstElement.html#gst-element-no-more-pads" title="gst_element_no_more_pads ()">gst_element_no_more_pads</a> (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GstElement.html#gst-element-release-request-pad" title="gst_element_release_request_pad ()">gst_element_release_request_pad</a> (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</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="GstElement.html#gst-element-remove-pad" title="gst_element_remove_pad ()">gst_element_remove_pad</a> (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);
<a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="returnvalue">GstIterator</span></a> * <a class="link" href="GstElement.html#gst-element-iterate-pads" title="gst_element_iterate_pads ()">gst_element_iterate_pads</a> (<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="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="returnvalue">GstIterator</span></a> * <a class="link" href="GstElement.html#gst-element-iterate-sink-pads" title="gst_element_iterate_sink_pads ()">gst_element_iterate_sink_pads</a> (<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="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="returnvalue">GstIterator</span></a> * <a class="link" href="GstElement.html#gst-element-iterate-src-pads" title="gst_element_iterate_src_pads ()">gst_element_iterate_src_pads</a> (<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="GstElement.html#gst-element-link" title="gst_element_link ()">gst_element_link</a> (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *dest</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GstElement.html#gst-element-unlink" title="gst_element_unlink ()">gst_element_unlink</a> (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *dest</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="GstElement.html#gst-element-link-many" title="gst_element_link_many ()">gst_element_link_many</a> (<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><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element_2</code></em>,
<em class="parameter"><code>...</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GstElement.html#gst-element-unlink-many" title="gst_element_unlink_many ()">gst_element_unlink_many</a> (<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><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element_2</code></em>,
<em class="parameter"><code>...</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="GstElement.html#gst-element-link-pads" title="gst_element_link_pads ()">gst_element_link_pads</a> (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *src</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> *srcpadname</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *dest</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> *destpadname</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="GstElement.html#gst-element-link-pads-full" title="gst_element_link_pads_full ()">gst_element_link_pads_full</a> (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *src</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> *srcpadname</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *dest</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> *destpadname</code></em>,
<em class="parameter"><code><a class="link" href="GstPad.html#GstPadLinkCheck" title="enum GstPadLinkCheck"><span class="type">GstPadLinkCheck</span></a> flags</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GstElement.html#gst-element-unlink-pads" title="gst_element_unlink_pads ()">gst_element_unlink_pads</a> (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *src</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> *srcpadname</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *dest</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> *destpadname</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="GstElement.html#gst-element-link-pads-filtered" title="gst_element_link_pads_filtered ()">gst_element_link_pads_filtered</a> (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *src</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> *srcpadname</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *dest</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> *destpadname</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="type">GstCaps</span></a> *filter</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="GstElement.html#gst-element-link-filtered" title="gst_element_link_filtered ()">gst_element_link_filtered</a> (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *dest</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="type">GstCaps</span></a> *filter</code></em>);
const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> * <a class="link" href="GstElement.html#gst-element-class-get-metadata" title="gst_element_class_get_metadata ()">gst_element_class_get_metadata</a> (<em class="parameter"><code><a class="link" href="GstElement.html#GstElementClass" title="struct GstElementClass"><span class="type">GstElementClass</span></a> *klass</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> *key</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GstElement.html#gst-element-set-base-time" title="gst_element_set_base_time ()">gst_element_set_base_time</a> (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> time</code></em>);
<a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="returnvalue">GstClockTime</span></a> <a class="link" href="GstElement.html#gst-element-get-base-time" title="gst_element_get_base_time ()">gst_element_get_base_time</a> (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GstElement.html#gst-element-set-start-time" title="gst_element_set_start_time ()">gst_element_set_start_time</a> (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> time</code></em>);
<a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="returnvalue">GstClockTime</span></a> <a class="link" href="GstElement.html#gst-element-get-start-time" title="gst_element_get_start_time ()">gst_element_get_start_time</a> (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GstElement.html#gst-element-set-bus" title="gst_element_set_bus ()">gst_element_set_bus</a> (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="GstBus.html" title="GstBus"><span class="type">GstBus</span></a> *bus</code></em>);
<a class="link" href="GstBus.html" title="GstBus"><span class="returnvalue">GstBus</span></a> * <a class="link" href="GstElement.html#gst-element-get-bus" title="gst_element_get_bus ()">gst_element_get_bus</a> (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GstElement.html#gst-element-set-context" title="gst_element_set_context ()">gst_element_set_context</a> (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstContext.html#GstContext" title="GstContext"><span class="type">GstContext</span></a> *context</code></em>);
<a class="link" href="GstElementFactory.html" title="GstElementFactory"><span class="returnvalue">GstElementFactory</span></a> * <a class="link" href="GstElement.html#gst-element-get-factory" title="gst_element_get_factory ()">gst_element_get_factory</a> (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>);
#define <a class="link" href="GstElement.html#gst-element-set-name" title="gst_element_set_name()">gst_element_set_name</a> (elem,
name)
#define <a class="link" href="GstElement.html#gst-element-get-name" title="gst_element_get_name()">gst_element_get_name</a> (elem)
#define <a class="link" href="GstElement.html#gst-element-set-parent" title="gst_element_set_parent()">gst_element_set_parent</a> (elem,
parent)
#define <a class="link" href="GstElement.html#gst-element-get-parent" title="gst_element_get_parent()">gst_element_get_parent</a> (elem)
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstElement.html#gst-element-set-clock" title="gst_element_set_clock ()">gst_element_set_clock</a> (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> *clock</code></em>);
<a class="link" href="GstClock.html" title="GstClock"><span class="returnvalue">GstClock</span></a> * <a class="link" href="GstElement.html#gst-element-get-clock" title="gst_element_get_clock ()">gst_element_get_clock</a> (<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="GstClock.html" title="GstClock"><span class="returnvalue">GstClock</span></a> * <a class="link" href="GstElement.html#gst-element-provide-clock" title="gst_element_provide_clock ()">gst_element_provide_clock</a> (<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#GstStateChangeReturn" title="enum GstStateChangeReturn"><span class="returnvalue">GstStateChangeReturn</span></a> <a class="link" href="GstElement.html#gst-element-set-state" title="gst_element_set_state ()">gst_element_set_state</a> (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> state</code></em>);
<a class="link" href="GstElement.html#GstStateChangeReturn" title="enum GstStateChangeReturn"><span class="returnvalue">GstStateChangeReturn</span></a> <a class="link" href="GstElement.html#gst-element-get-state" title="gst_element_get_state ()">gst_element_get_state</a> (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> *state</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> *pending</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> timeout</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="GstElement.html#gst-element-set-locked-state" title="gst_element_set_locked_state ()">gst_element_set_locked_state</a> (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> locked_state</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="GstElement.html#gst-element-is-locked-state" title="gst_element_is_locked_state ()">gst_element_is_locked_state</a> (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GstElement.html#gst-element-abort-state" title="gst_element_abort_state ()">gst_element_abort_state</a> (<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#GstStateChangeReturn" title="enum GstStateChangeReturn"><span class="returnvalue">GstStateChangeReturn</span></a> <a class="link" href="GstElement.html#gst-element-continue-state" title="gst_element_continue_state ()">gst_element_continue_state</a> (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html#GstStateChangeReturn" title="enum GstStateChangeReturn"><span class="type">GstStateChangeReturn</span></a> ret</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GstElement.html#gst-element-lost-state" title="gst_element_lost_state ()">gst_element_lost_state</a> (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>);
const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> * <a class="link" href="GstElement.html#gst-element-state-get-name" title="gst_element_state_get_name ()">gst_element_state_get_name</a> (<em class="parameter"><code><a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> state</code></em>);
const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> * <a class="link" href="GstElement.html#gst-element-state-change-return-get-name" title="gst_element_state_change_return_get_name ()">gst_element_state_change_return_get_name</a>
(<em class="parameter"><code><a class="link" href="GstElement.html#GstStateChangeReturn" title="enum GstStateChangeReturn"><span class="type">GstStateChangeReturn</span></a> state_ret</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="GstElement.html#gst-element-sync-state-with-parent" title="gst_element_sync_state_with_parent ()">gst_element_sync_state_with_parent</a> (<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#GstStateChangeReturn" title="enum GstStateChangeReturn"><span class="returnvalue">GstStateChangeReturn</span></a> <a class="link" href="GstElement.html#gst-element-change-state" title="gst_element_change_state ()">gst_element_change_state</a> (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html#GstStateChange" title="enum GstStateChange"><span class="type">GstStateChange</span></a> transition</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GstElement.html#gst-element-message-full" title="gst_element_message_full ()">gst_element_message_full</a> (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessageType" title="enum GstMessageType"><span class="type">GstMessageType</span></a> type</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> domain</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> code</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *text</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *debug</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> *file</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> *function</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> line</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="GstElement.html#gst-element-post-message" title="gst_element_post_message ()">gst_element_post_message</a> (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</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="GstElement.html#gst-element-query" title="gst_element_query ()">gst_element_query</a> (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstQuery.html#GstQuery" title="struct GstQuery"><span class="type">GstQuery</span></a> *query</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="GstElement.html#gst-element-query-convert" title="gst_element_query_convert ()">gst_element_query_convert</a> (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> src_format</code></em>,
<em class="parameter"><code><span class="type">gint64</span> src_val</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> dest_format</code></em>,
<em class="parameter"><code><span class="type">gint64</span> *dest_val</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="GstElement.html#gst-element-query-position" title="gst_element_query_position ()">gst_element_query_position</a> (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> format</code></em>,
<em class="parameter"><code><span class="type">gint64</span> *cur</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="GstElement.html#gst-element-query-duration" title="gst_element_query_duration ()">gst_element_query_duration</a> (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> format</code></em>,
<em class="parameter"><code><span class="type">gint64</span> *duration</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="GstElement.html#gst-element-send-event" title="gst_element_send_event ()">gst_element_send_event</a> (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstEvent.html#GstEvent" title="struct GstEvent"><span class="type">GstEvent</span></a> *event</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="GstElement.html#gst-element-seek-simple" title="gst_element_seek_simple ()">gst_element_seek_simple</a> (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> format</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstEvent.html#GstSeekFlags" title="enum GstSeekFlags"><span class="type">GstSeekFlags</span></a> seek_flags</code></em>,
<em class="parameter"><code><span class="type">gint64</span> seek_pos</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="GstElement.html#gst-element-seek" title="gst_element_seek ()">gst_element_seek</a> (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> rate</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> format</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstEvent.html#GstSeekFlags" title="enum GstSeekFlags"><span class="type">GstSeekFlags</span></a> flags</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstEvent.html#GstSeekType" title="enum GstSeekType"><span class="type">GstSeekType</span></a> start_type</code></em>,
<em class="parameter"><code><span class="type">gint64</span> start</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstEvent.html#GstSeekType" title="enum GstSeekType"><span class="type">GstSeekType</span></a> stop_type</code></em>,
<em class="parameter"><code><span class="type">gint64</span> stop</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="GstElement.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>
+----GstElement
+----<a class="link" href="GstBin.html" title="GstBin">GstBin</a>
</pre>
</div>
<div class="refsect1">
<a name="GstElement.derived-interfaces"></a><h2>Known Derived Interfaces</h2>
<p>
GstElement is required by
<a class="link" href="GstTagSetter.html" title="GstTagSetter">GstTagSetter</a>.</p>
</div>
<div class="refsect1">
<a name="GstElement.signals"></a><h2>Signals</h2>
<pre class="synopsis">
"<a class="link" href="GstElement.html#GstElement-no-more-pads" title='The "no-more-pads" signal'>no-more-pads</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="GstElement.html#GstElement-pad-added" title='The "pad-added" signal'>pad-added</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="GstElement.html#GstElement-pad-removed" title='The "pad-removed" signal'>pad-removed</a>" : <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS"><code class="literal">Run Last</code></a>
</pre>
</div>
<div class="refsect1">
<a name="GstElement.description"></a><h2>Description</h2>
<p>
GstElement is the abstract base class needed to construct an element that
can be used in a GStreamer pipeline. Please refer to the plugin writers
guide for more information on creating <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> subclasses.
</p>
<p>
The name of a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> can be get with <a class="link" href="GstElement.html#gst-element-get-name" title="gst_element_get_name()"><code class="function">gst_element_get_name()</code></a> and set with
<a class="link" href="GstElement.html#gst-element-set-name" title="gst_element_set_name()"><code class="function">gst_element_set_name()</code></a>. For speed, <a class="link" href="GstElement.html#GST-ELEMENT-NAME:CAPS" title="GST_ELEMENT_NAME()"><code class="function">GST_ELEMENT_NAME()</code></a> can be used in the
core when using the appropriate locking. Do not use this in plug-ins or
applications in order to retain ABI compatibility.
</p>
<p>
Elements can have pads (of the type <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>). These pads link to pads on
other elements. <a class="link" href="gstreamer-GstBuffer.html#GstBuffer" title="struct GstBuffer"><span class="type">GstBuffer</span></a> flow between these linked pads.
A <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> has a <a href="http://library.gnome.org/devel/glib/unstable/glib-Doubly-Linked-Lists.html#GList"><span class="type">GList</span></a> of <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> structures for all their input (or sink)
and output (or source) pads.
Core and plug-in writers can add and remove pads with <a class="link" href="GstElement.html#gst-element-add-pad" title="gst_element_add_pad ()"><code class="function">gst_element_add_pad()</code></a>
and <a class="link" href="GstElement.html#gst-element-remove-pad" title="gst_element_remove_pad ()"><code class="function">gst_element_remove_pad()</code></a>.
</p>
<p>
An existing pad of an element can be retrieved by name with
<a class="link" href="GstElement.html#gst-element-get-static-pad" title="gst_element_get_static_pad ()"><code class="function">gst_element_get_static_pad()</code></a>. A new dynamic pad can be created using
<a class="link" href="GstElement.html#gst-element-request-pad" title="gst_element_request_pad ()"><code class="function">gst_element_request_pad()</code></a> with a <a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="type">GstPadTemplate</span></a> or
<a class="link" href="GstElement.html#gst-element-get-request-pad" title="gst_element_get_request_pad ()"><code class="function">gst_element_get_request_pad()</code></a> with the template name such as "src_%u".
An iterator of all pads can be retrieved with <a class="link" href="GstElement.html#gst-element-iterate-pads" title="gst_element_iterate_pads ()"><code class="function">gst_element_iterate_pads()</code></a>.
</p>
<p>
Elements can be linked through their pads.
If the link is straightforward, use the <a class="link" href="GstElement.html#gst-element-link" title="gst_element_link ()"><code class="function">gst_element_link()</code></a>
convenience function to link two elements, or <a class="link" href="GstElement.html#gst-element-link-many" title="gst_element_link_many ()"><code class="function">gst_element_link_many()</code></a>
for more elements in a row.
Use <a class="link" href="GstElement.html#gst-element-link-filtered" title="gst_element_link_filtered ()"><code class="function">gst_element_link_filtered()</code></a> to link two elements constrained by
a specified set of <a class="link" href="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="type">GstCaps</span></a>.
For finer control, use <a class="link" href="GstElement.html#gst-element-link-pads" title="gst_element_link_pads ()"><code class="function">gst_element_link_pads()</code></a> and
<a class="link" href="GstElement.html#gst-element-link-pads-filtered" title="gst_element_link_pads_filtered ()"><code class="function">gst_element_link_pads_filtered()</code></a> to specify the pads to link on
each element by name.
</p>
<p>
Each element has a state (see <a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a>). You can get and set the state
of an element with <a class="link" href="GstElement.html#gst-element-get-state" title="gst_element_get_state ()"><code class="function">gst_element_get_state()</code></a> and <a class="link" href="GstElement.html#gst-element-set-state" title="gst_element_set_state ()"><code class="function">gst_element_set_state()</code></a>.
Setting a state triggers a <a class="link" href="GstElement.html#GstStateChange" title="enum GstStateChange"><span class="type">GstStateChange</span></a>. To get a string representation
of a <a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a>, use <a class="link" href="GstElement.html#gst-element-state-get-name" title="gst_element_state_get_name ()"><code class="function">gst_element_state_get_name()</code></a>.
</p>
<p>
You can get and set a <a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> on an element using <a class="link" href="GstElement.html#gst-element-get-clock" title="gst_element_get_clock ()"><code class="function">gst_element_get_clock()</code></a>
and <a class="link" href="GstElement.html#gst-element-set-clock" title="gst_element_set_clock ()"><code class="function">gst_element_set_clock()</code></a>.
Some elements can provide a clock for the pipeline if
the <a class="link" href="GstElement.html#GST-ELEMENT-FLAG-PROVIDE-CLOCK:CAPS"><span class="type">GST_ELEMENT_FLAG_PROVIDE_CLOCK</span></a> flag is set. With the
<a class="link" href="GstElement.html#gst-element-provide-clock" title="gst_element_provide_clock ()"><code class="function">gst_element_provide_clock()</code></a> method one can retrieve the clock provided by
such an element.
Not all elements require a clock to operate correctly. If the
#<a class="link" href="GstElement.html#GST-ELEMENT-FLAG-REQUIRE-CLOCK:CAPS"><code class="function">GST_ELEMENT_FLAG_REQUIRE_CLOCK()</code></a> flag is set, a clock should be set on the
element with <a class="link" href="GstElement.html#gst-element-set-clock" title="gst_element_set_clock ()"><code class="function">gst_element_set_clock()</code></a>.
</p>
<p>
Note that clock slection and distribution is normally handled by the
toplevel <a class="link" href="GstPipeline.html" title="GstPipeline"><span class="type">GstPipeline</span></a> so the clock functions are only to be used in very
specific situations.
</p>
<p>
Last reviewed on 2012-03-28 (0.11.3)
</p>
</div>
<div class="refsect1">
<a name="GstElement.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GstElement-struct"></a><h3>struct GstElement</h3>
<pre class="programlisting">struct GstElement {
GRecMutex state_lock;
/* element state */
GCond state_cond;
guint32 state_cookie;
GstState target_state;
GstState current_state;
GstState next_state;
GstState pending_state;
GstStateChangeReturn last_return;
GstBus *bus;
/* allocated clock */
GstClock *clock;
GstClockTimeDiff base_time; /* NULL/READY: 0 - PAUSED: current time - PLAYING: difference to clock */
GstClockTime start_time;
/* element pads, these lists can only be iterated while holding
* the LOCK or checking the cookie after each LOCK. */
guint16 numpads;
GList *pads;
guint16 numsrcpads;
GList *srcpads;
guint16 numsinkpads;
GList *sinkpads;
guint32 pads_cookie;
};
</pre>
<p>
GStreamer element abstract base class.
</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-Threads.html#GRecMutex"><span class="type">GRecMutex</span></a> <em class="structfield"><code><a name="GstElement-struct.state-lock"></a>state_lock</code></em>;</span></p></td>
<td>Used to serialize execution of <a class="link" href="GstElement.html#gst-element-set-state" title="gst_element_set_state ()"><code class="function">gst_element_set_state()</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Threads.html#GCond"><span class="type">GCond</span></a> <em class="structfield"><code><a name="GstElement-struct.state-cond"></a>state_cond</code></em>;</span></p></td>
<td>Used to signal completion of a state change</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">guint32</span> <em class="structfield"><code><a name="GstElement-struct.state-cookie"></a>state_cookie</code></em>;</span></p></td>
<td>Used to detect concurrent execution of
<a class="link" href="GstElement.html#gst-element-set-state" title="gst_element_set_state ()"><code class="function">gst_element_set_state()</code></a> and <a class="link" href="GstElement.html#gst-element-get-state" title="gst_element_get_state ()"><code class="function">gst_element_get_state()</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> <em class="structfield"><code><a name="GstElement-struct.target-state"></a>target_state</code></em>;</span></p></td>
<td>the target state of an element as set by the application</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> <em class="structfield"><code><a name="GstElement-struct.current-state"></a>current_state</code></em>;</span></p></td>
<td>the current state of an element</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> <em class="structfield"><code><a name="GstElement-struct.next-state"></a>next_state</code></em>;</span></p></td>
<td>the next state of an element, can be <a class="link" href="GstElement.html#GST-STATE-VOID-PENDING:CAPS"><span class="type">GST_STATE_VOID_PENDING</span></a> if
the element is in the correct state.</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> <em class="structfield"><code><a name="GstElement-struct.pending-state"></a>pending_state</code></em>;</span></p></td>
<td>the final state the element should go to, can be
<a class="link" href="GstElement.html#GST-STATE-VOID-PENDING:CAPS"><span class="type">GST_STATE_VOID_PENDING</span></a> if the element is in the correct state</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="GstElement.html#GstStateChangeReturn" title="enum GstStateChangeReturn"><span class="type">GstStateChangeReturn</span></a> <em class="structfield"><code><a name="GstElement-struct.last-return"></a>last_return</code></em>;</span></p></td>
<td>the last return value of an element state change</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="GstElement-struct.bus"></a>bus</code></em>;</span></p></td>
<td>the bus of the element. This bus is provided to the element by the
parent element or the application. A <a class="link" href="GstPipeline.html" title="GstPipeline"><span class="type">GstPipeline</span></a> has a bus of its own.</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="GstElement-struct.clock"></a>clock</code></em>;</span></p></td>
<td>the clock of the element. This clock is usually provided to the
element by the toplevel <a class="link" href="GstPipeline.html" title="GstPipeline"><span class="type">GstPipeline</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="GstClock.html#GstClockTimeDiff" title="GstClockTimeDiff"><span class="type">GstClockTimeDiff</span></a> <em class="structfield"><code><a name="GstElement-struct.base-time"></a>base_time</code></em>;</span></p></td>
<td>the time of the clock right before the element is set to
PLAYING. Subtracting <em class="parameter"><code>base_time</code></em> from the current clock time in the PLAYING
state will yield the running_time against the clock.</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> <em class="structfield"><code><a name="GstElement-struct.start-time"></a>start_time</code></em>;</span></p></td>
<td>the running_time of the last PAUSED state</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">guint16</span> <em class="structfield"><code><a name="GstElement-struct.numpads"></a>numpads</code></em>;</span></p></td>
<td>number of pads of the element, includes both source and sink pads.</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="GstElement-struct.pads"></a>pads</code></em>;</span></p></td>
<td>list of pads. <span class="annotation">[<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> Gst.Pad]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">guint16</span> <em class="structfield"><code><a name="GstElement-struct.numsrcpads"></a>numsrcpads</code></em>;</span></p></td>
<td>number of source pads of the element.</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="GstElement-struct.srcpads"></a>srcpads</code></em>;</span></p></td>
<td>list of source pads. <span class="annotation">[<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> Gst.Pad]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">guint16</span> <em class="structfield"><code><a name="GstElement-struct.numsinkpads"></a>numsinkpads</code></em>;</span></p></td>
<td>number of sink pads of the element.</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="GstElement-struct.sinkpads"></a>sinkpads</code></em>;</span></p></td>
<td>list of sink pads. <span class="annotation">[<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> Gst.Pad]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">guint32</span> <em class="structfield"><code><a name="GstElement-struct.pads-cookie"></a>pads_cookie</code></em>;</span></p></td>
<td>updated whenever the a pad is added or removed</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstElementClass"></a><h3>struct GstElementClass</h3>
<pre class="programlisting">struct GstElementClass {
GstObjectClass parent_class;
/* the element metadata */
gpointer metadata;
/* factory that the element was created from */
GstElementFactory *elementfactory;
/* templates for our pads */
GList *padtemplates;
gint numpadtemplates;
guint32 pad_templ_cookie;
/* virtual methods for subclasses */
/* request/release pads */
GstPad* (*request_new_pad) (GstElement *element, GstPadTemplate *templ,
const gchar* name, const GstCaps *caps);
void (*release_pad) (GstElement *element, GstPad *pad);
/* state changes */
GstStateChangeReturn (*get_state) (GstElement * element, GstState * state,
GstState * pending, GstClockTime timeout);
GstStateChangeReturn (*set_state) (GstElement *element, GstState state);
GstStateChangeReturn (*change_state) (GstElement *element, GstStateChange transition);
void (*state_changed) (GstElement *element, GstState oldstate,
GstState newstate, GstState pending);
/* bus */
void (*set_bus) (GstElement * element, GstBus * bus);
/* set/get clocks */
GstClock* (*provide_clock) (GstElement *element);
gboolean (*set_clock) (GstElement *element, GstClock *clock);
/* query functions */
gboolean (*send_event) (GstElement *element, GstEvent *event);
gboolean (*query) (GstElement *element, GstQuery *query);
gboolean (*post_message) (GstElement *element, GstMessage *message);
void (*set_context) (GstElement *element, GstContext *context);
};
</pre>
<p>
GStreamer element class. Override the vmethods to implement the element
functionality.
</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="GstObject.html#GstObjectClass" title="struct GstObjectClass"><span class="type">GstObjectClass</span></a> <em class="structfield"><code><a name="GstElementClass.parent-class"></a>parent_class</code></em>;</span></p></td>
<td>the parent class structure</td>
</tr>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> <em class="structfield"><code><a name="GstElementClass.metadata"></a>metadata</code></em>;</span></p></td>
<td>metadata for elements of this class</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="GstElementFactory.html" title="GstElementFactory"><span class="type">GstElementFactory</span></a> *<em class="structfield"><code><a name="GstElementClass.elementfactory"></a>elementfactory</code></em>;</span></p></td>
<td>the <a class="link" href="GstElementFactory.html" title="GstElementFactory"><span class="type">GstElementFactory</span></a> that creates these elements</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="GstElementClass.padtemplates"></a>padtemplates</code></em>;</span></p></td>
<td>a <a href="http://library.gnome.org/devel/glib/unstable/glib-Doubly-Linked-Lists.html#GList"><span class="type">GList</span></a> of <a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="type">GstPadTemplate</span></a>
</td>
</tr>
<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="GstElementClass.numpadtemplates"></a>numpadtemplates</code></em>;</span></p></td>
<td>the number of padtemplates</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">guint32</span> <em class="structfield"><code><a name="GstElementClass.pad-templ-cookie"></a>pad_templ_cookie</code></em>;</span></p></td>
<td>changed whenever the padtemplates change</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstElementClass.request-new-pad"></a>request_new_pad</code></em> ()</span></p></td>
<td>called when a new pad is requested</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstElementClass.release-pad"></a>release_pad</code></em> ()</span></p></td>
<td>called when a request pad is to be released</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstElementClass.get-state"></a>get_state</code></em> ()</span></p></td>
<td>get the state of the element</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstElementClass.set-state"></a>set_state</code></em> ()</span></p></td>
<td>set a new state on the element</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstElementClass.change-state"></a>change_state</code></em> ()</span></p></td>
<td>called by <em class="parameter"><code>set_state</code></em> to perform an incremental state change</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstElementClass.state-changed"></a>state_changed</code></em> ()</span></p></td>
<td>called immediately after a new state was set.</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstElementClass.set-bus"></a>set_bus</code></em> ()</span></p></td>
<td>set a <a class="link" href="GstBus.html" title="GstBus"><span class="type">GstBus</span></a> on the element</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstElementClass.provide-clock"></a>provide_clock</code></em> ()</span></p></td>
<td>gets the <a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> provided by the element</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstElementClass.set-clock"></a>set_clock</code></em> ()</span></p></td>
<td>set the <a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> on the element</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstElementClass.send-event"></a>send_event</code></em> ()</span></p></td>
<td>send a <a class="link" href="gstreamer-GstEvent.html#GstEvent" title="struct GstEvent"><span class="type">GstEvent</span></a> to the element</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstElementClass.query"></a>query</code></em> ()</span></p></td>
<td>perform a <a class="link" href="gstreamer-GstQuery.html#GstQuery" title="struct GstQuery"><span class="type">GstQuery</span></a> on the element</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstElementClass.post-message"></a>post_message</code></em> ()</span></p></td>
<td>called when a message is posted on the element. Chain up to
the parent class' handler to have it posted on the bus.</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstElementClass.set-context"></a>set_context</code></em> ()</span></p></td>
<td>set a <a class="link" href="gstreamer-GstContext.html#GstContext" title="GstContext"><span class="type">GstContext</span></a> on the element</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstElementFlags"></a><h3>enum GstElementFlags</h3>
<pre class="programlisting">typedef enum {
GST_ELEMENT_FLAG_LOCKED_STATE = (GST_OBJECT_FLAG_LAST << 0),
GST_ELEMENT_FLAG_SINK = (GST_OBJECT_FLAG_LAST << 1),
GST_ELEMENT_FLAG_SOURCE = (GST_OBJECT_FLAG_LAST << 2),
GST_ELEMENT_FLAG_PROVIDE_CLOCK = (GST_OBJECT_FLAG_LAST << 3),
GST_ELEMENT_FLAG_REQUIRE_CLOCK = (GST_OBJECT_FLAG_LAST << 4),
GST_ELEMENT_FLAG_INDEXABLE = (GST_OBJECT_FLAG_LAST << 5),
/* padding */
GST_ELEMENT_FLAG_LAST = (GST_OBJECT_FLAG_LAST << 10)
} GstElementFlags;
</pre>
<p>
The standard flags that an element may have.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><a name="GST-ELEMENT-FLAG-LOCKED-STATE:CAPS"></a><span class="term"><code class="literal">GST_ELEMENT_FLAG_LOCKED_STATE</code></span></p></td>
<td>ignore state changes from parent
</td>
</tr>
<tr>
<td><p><a name="GST-ELEMENT-FLAG-SINK:CAPS"></a><span class="term"><code class="literal">GST_ELEMENT_FLAG_SINK</code></span></p></td>
<td>the element is a sink
</td>
</tr>
<tr>
<td><p><a name="GST-ELEMENT-FLAG-SOURCE:CAPS"></a><span class="term"><code class="literal">GST_ELEMENT_FLAG_SOURCE</code></span></p></td>
<td>the element is a source.
</td>
</tr>
<tr>
<td><p><a name="GST-ELEMENT-FLAG-PROVIDE-CLOCK:CAPS"></a><span class="term"><code class="literal">GST_ELEMENT_FLAG_PROVIDE_CLOCK</code></span></p></td>
<td>the element can provide a clock
</td>
</tr>
<tr>
<td><p><a name="GST-ELEMENT-FLAG-REQUIRE-CLOCK:CAPS"></a><span class="term"><code class="literal">GST_ELEMENT_FLAG_REQUIRE_CLOCK</code></span></p></td>
<td>the element requires a clock
</td>
</tr>
<tr>
<td><p><a name="GST-ELEMENT-FLAG-INDEXABLE:CAPS"></a><span class="term"><code class="literal">GST_ELEMENT_FLAG_INDEXABLE</code></span></p></td>
<td>the element can use an index
</td>
</tr>
<tr>
<td><p><a name="GST-ELEMENT-FLAG-LAST:CAPS"></a><span class="term"><code class="literal">GST_ELEMENT_FLAG_LAST</code></span></p></td>
<td>offset to define more flags
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstState"></a><h3>enum GstState</h3>
<pre class="programlisting">typedef enum {
GST_STATE_VOID_PENDING = 0,
GST_STATE_NULL = 1,
GST_STATE_READY = 2,
GST_STATE_PAUSED = 3,
GST_STATE_PLAYING = 4
} GstState;
</pre>
<p>
The possible states an element can be in. States can be changed using
<a class="link" href="GstElement.html#gst-element-set-state" title="gst_element_set_state ()"><code class="function">gst_element_set_state()</code></a> and checked using <a class="link" href="GstElement.html#gst-element-get-state" title="gst_element_get_state ()"><code class="function">gst_element_get_state()</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-STATE-VOID-PENDING:CAPS"></a><span class="term"><code class="literal">GST_STATE_VOID_PENDING</code></span></p></td>
<td>no pending state.
</td>
</tr>
<tr>
<td><p><a name="GST-STATE-NULL:CAPS"></a><span class="term"><code class="literal">GST_STATE_NULL</code></span></p></td>
<td>the NULL state or initial state of an element.
</td>
</tr>
<tr>
<td><p><a name="GST-STATE-READY:CAPS"></a><span class="term"><code class="literal">GST_STATE_READY</code></span></p></td>
<td>the element is ready to go to PAUSED.
</td>
</tr>
<tr>
<td><p><a name="GST-STATE-PAUSED:CAPS"></a><span class="term"><code class="literal">GST_STATE_PAUSED</code></span></p></td>
<td>the element is PAUSED, it is ready to accept and
process data. Sink elements however only accept one
buffer and then block.
</td>
</tr>
<tr>
<td><p><a name="GST-STATE-PLAYING:CAPS"></a><span class="term"><code class="literal">GST_STATE_PLAYING</code></span></p></td>
<td>the element is PLAYING, the <a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> is running and
the data is flowing.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstStateChange"></a><h3>enum GstStateChange</h3>
<pre class="programlisting">typedef enum {
GST_STATE_CHANGE_NULL_TO_READY = (GST_STATE_NULL<<3) | GST_STATE_READY,
GST_STATE_CHANGE_READY_TO_PAUSED = (GST_STATE_READY<<3) | GST_STATE_PAUSED,
GST_STATE_CHANGE_PAUSED_TO_PLAYING = (GST_STATE_PAUSED<<3) | GST_STATE_PLAYING,
GST_STATE_CHANGE_PLAYING_TO_PAUSED = (GST_STATE_PLAYING<<3) | GST_STATE_PAUSED,
GST_STATE_CHANGE_PAUSED_TO_READY = (GST_STATE_PAUSED<<3) | GST_STATE_READY,
GST_STATE_CHANGE_READY_TO_NULL = (GST_STATE_READY<<3) | GST_STATE_NULL
} GstStateChange;
</pre>
<p>
These are the different state changes an element goes through.
<a class="link" href="GstElement.html#GST-STATE-NULL:CAPS"><code class="literal">GST_STATE_NULL</code></a> ⇒ <a class="link" href="GstElement.html#GST-STATE-PLAYING:CAPS"><code class="literal">GST_STATE_PLAYING</code></a> is called an upwards state change
and <a class="link" href="GstElement.html#GST-STATE-PLAYING:CAPS"><code class="literal">GST_STATE_PLAYING</code></a> ⇒ <a class="link" href="GstElement.html#GST-STATE-NULL:CAPS"><code class="literal">GST_STATE_NULL</code></a> a downwards state change.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><a name="GST-STATE-CHANGE-NULL-TO-READY:CAPS"></a><span class="term"><code class="literal">GST_STATE_CHANGE_NULL_TO_READY</code></span></p></td>
<td>state change from NULL to READY.
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem"><p>
The element must check if the resources it needs are available. Device
sinks and -sources typically try to probe the device to constrain their
caps.
</p></li>
<li class="listitem"><p>
The element opens the device (in case feature need to be probed).
</p></li>
</ul></div>
</td>
</tr>
<tr>
<td><p><a name="GST-STATE-CHANGE-READY-TO-PAUSED:CAPS"></a><span class="term"><code class="literal">GST_STATE_CHANGE_READY_TO_PAUSED</code></span></p></td>
<td>state change from READY to PAUSED.
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem"><p>
The element pads are activated in order to receive data in PAUSED.
Streaming threads are started.
</p></li>
<li class="listitem"><p>
Some elements might need to return <a class="link" href="GstElement.html#GST-STATE-CHANGE-ASYNC:CAPS"><code class="literal">GST_STATE_CHANGE_ASYNC</code></a> and complete
the state change when they have enough information. It is a requirement
for sinks to return <a class="link" href="GstElement.html#GST-STATE-CHANGE-ASYNC:CAPS"><code class="literal">GST_STATE_CHANGE_ASYNC</code></a> and complete the state change
when they receive the first buffer or <a class="link" href="gstreamer-GstEvent.html#GST-EVENT-EOS:CAPS"><code class="literal">GST_EVENT_EOS</code></a> (preroll).
Sinks also block the dataflow when in PAUSED.
</p></li>
<li class="listitem"><p>
A pipeline resets the running_time to 0.
</p></li>
<li class="listitem"><p>
Live sources return <a class="link" href="GstElement.html#GST-STATE-CHANGE-NO-PREROLL:CAPS"><code class="literal">GST_STATE_CHANGE_NO_PREROLL</code></a> and don't generate data.
</p></li>
</ul></div>
</td>
</tr>
<tr>
<td><p><a name="GST-STATE-CHANGE-PAUSED-TO-PLAYING:CAPS"></a><span class="term"><code class="literal">GST_STATE_CHANGE_PAUSED_TO_PLAYING</code></span></p></td>
<td>state change from PAUSED to PLAYING.
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem"><p>
Most elements ignore this state change.
</p></li>
<li class="listitem"><p>
The pipeline selects a <a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> and distributes this to all the children
before setting them to PLAYING. This means that it is only alowed to
synchronize on the <a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> in the PLAYING state.
</p></li>
<li class="listitem"><p>
The pipeline uses the <a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> and the running_time to calculate the
base_time. The base_time is distributed to all children when performing
the state change.
</p></li>
<li class="listitem"><p>
Sink elements stop blocking on the preroll buffer or event and start
rendering the data.
</p></li>
<li class="listitem"><p>
Sinks can post <a class="link" href="gstreamer-GstMessage.html#GST-MESSAGE-EOS:CAPS"><code class="literal">GST_MESSAGE_EOS</code></a> in the PLAYING state. It is not allowed
to post <a class="link" href="gstreamer-GstMessage.html#GST-MESSAGE-EOS:CAPS"><code class="literal">GST_MESSAGE_EOS</code></a> when not in the PLAYING state.
</p></li>
<li class="listitem"><p>
While streaming in PAUSED or PLAYING elements can create and remove
sometimes pads.
</p></li>
<li class="listitem"><p>
Live sources start generating data and return <a class="link" href="GstElement.html#GST-STATE-CHANGE-SUCCESS:CAPS"><code class="literal">GST_STATE_CHANGE_SUCCESS</code></a>.
</p></li>
</ul></div>
</td>
</tr>
<tr>
<td><p><a name="GST-STATE-CHANGE-PLAYING-TO-PAUSED:CAPS"></a><span class="term"><code class="literal">GST_STATE_CHANGE_PLAYING_TO_PAUSED</code></span></p></td>
<td>state change from PLAYING to PAUSED.
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem"><p>
Most elements ignore this state change.
</p></li>
<li class="listitem"><p>
The pipeline calculates the running_time based on the last selected
<a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> and the base_time. It stores this information to continue
playback when going back to the PLAYING state.
</p></li>
<li class="listitem"><p>
Sinks unblock any <a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> wait calls.
</p></li>
<li class="listitem"><p>
When a sink does not have a pending buffer to play, it returns
<a class="link" href="GstElement.html#GST-STATE-CHANGE-ASYNC:CAPS"><code class="literal">GST_STATE_CHANGE_ASYNC</code></a> from this state change and completes the state
change when it receives a new buffer or an <a class="link" href="gstreamer-GstEvent.html#GST-EVENT-EOS:CAPS"><code class="literal">GST_EVENT_EOS</code></a>.
</p></li>
<li class="listitem"><p>
Any queued <a class="link" href="gstreamer-GstMessage.html#GST-MESSAGE-EOS:CAPS"><code class="literal">GST_MESSAGE_EOS</code></a> items are removed since they will be reposted
when going back to the PLAYING state. The EOS messages are queued in
<a class="link" href="GstBin.html" title="GstBin"><span class="type">GstBin</span></a> containers.
</p></li>
<li class="listitem"><p>
Live sources stop generating data and return <a class="link" href="GstElement.html#GST-STATE-CHANGE-NO-PREROLL:CAPS"><code class="literal">GST_STATE_CHANGE_NO_PREROLL</code></a>.
</p></li>
</ul></div>
</td>
</tr>
<tr>
<td><p><a name="GST-STATE-CHANGE-PAUSED-TO-READY:CAPS"></a><span class="term"><code class="literal">GST_STATE_CHANGE_PAUSED_TO_READY</code></span></p></td>
<td>state change from PAUSED to READY.
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem"><p>
Sinks unblock any waits in the preroll.
</p></li>
<li class="listitem"><p>
Elements unblock any waits on devices
</p></li>
<li class="listitem"><p>
Chain or get_range functions return <a class="link" href="GstPad.html#GST-FLOW-FLUSHING:CAPS"><code class="literal">GST_FLOW_FLUSHING</code></a>.
</p></li>
<li class="listitem"><p>
The element pads are deactivated so that streaming becomes impossible and
all streaming threads are stopped.
</p></li>
<li class="listitem"><p>
The sink forgets all negotiated formats
</p></li>
<li class="listitem"><p>
Elements remove all sometimes pads
</p></li>
</ul></div>
</td>
</tr>
<tr>
<td><p><a name="GST-STATE-CHANGE-READY-TO-NULL:CAPS"></a><span class="term"><code class="literal">GST_STATE_CHANGE_READY_TO_NULL</code></span></p></td>
<td>state change from READY to NULL.
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem"><p>
Elements close devices
</p></li>
<li class="listitem"><p>
Elements reset any internal state.
</p></li>
</ul></div>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstStateChangeReturn"></a><h3>enum GstStateChangeReturn</h3>
<pre class="programlisting">typedef enum {
GST_STATE_CHANGE_FAILURE = 0,
GST_STATE_CHANGE_SUCCESS = 1,
GST_STATE_CHANGE_ASYNC = 2,
GST_STATE_CHANGE_NO_PREROLL = 3
} GstStateChangeReturn;
</pre>
<p>
The possible return values from a state change function such as
<a class="link" href="GstElement.html#gst-element-set-state" title="gst_element_set_state ()"><code class="function">gst_element_set_state()</code></a>. Only <em class="parameter"><code>GST_STATE_CHANGE_FAILURE</code></em> is a real failure.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><a name="GST-STATE-CHANGE-FAILURE:CAPS"></a><span class="term"><code class="literal">GST_STATE_CHANGE_FAILURE</code></span></p></td>
<td>the state change failed
</td>
</tr>
<tr>
<td><p><a name="GST-STATE-CHANGE-SUCCESS:CAPS"></a><span class="term"><code class="literal">GST_STATE_CHANGE_SUCCESS</code></span></p></td>
<td>the state change succeeded
</td>
</tr>
<tr>
<td><p><a name="GST-STATE-CHANGE-ASYNC:CAPS"></a><span class="term"><code class="literal">GST_STATE_CHANGE_ASYNC</code></span></p></td>
<td>the state change will happen asynchronously
</td>
</tr>
<tr>
<td><p><a name="GST-STATE-CHANGE-NO-PREROLL:CAPS"></a><span class="term"><code class="literal">GST_STATE_CHANGE_NO_PREROLL</code></span></p></td>
<td>the state change succeeded but the element
cannot produce data in <a class="link" href="GstElement.html#GST-STATE-PAUSED:CAPS"><code class="literal">GST_STATE_PAUSED</code></a>.
This typically happens with live sources.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-STATE:CAPS"></a><h3>GST_STATE()</h3>
<pre class="programlisting">#define GST_STATE(elem) (GST_ELEMENT_CAST(elem)->current_state)
</pre>
<p>
This macro returns the current <a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> of the element.
</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>elem</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to return state for.</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-STATE-GET-NEXT:CAPS"></a><h3>GST_STATE_GET_NEXT()</h3>
<pre class="programlisting">#define GST_STATE_GET_NEXT(cur,pending) ((GstState)((cur) + __GST_SIGN ((gint)(pending) - (gint)(cur))))
</pre>
<p>
Given a current state <em class="parameter"><code>cur</code></em> and a target state <em class="parameter"><code>pending</code></em>, calculate the next (intermediate)
<a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</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"><em class="parameter"><code>cur</code></em> :</span></p></td>
<td>A starting <a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>pending</code></em> :</span></p></td>
<td>A target <a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-STATE-NEXT:CAPS"></a><h3>GST_STATE_NEXT()</h3>
<pre class="programlisting">#define GST_STATE_NEXT(elem) (GST_ELEMENT_CAST(elem)->next_state)
</pre>
<p>
This macro returns the next <a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> of the element.
</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>elem</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to return the next state for.</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-STATE-PENDING:CAPS"></a><h3>GST_STATE_PENDING()</h3>
<pre class="programlisting">#define GST_STATE_PENDING(elem) (GST_ELEMENT_CAST(elem)->pending_state)
</pre>
<p>
This macro returns the currently pending <a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> of the element.
</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>elem</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to return the pending state for.</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-STATE-RETURN:CAPS"></a><h3>GST_STATE_RETURN()</h3>
<pre class="programlisting">#define GST_STATE_RETURN(elem) (GST_ELEMENT_CAST(elem)->last_return)
</pre>
<p>
This macro returns the last <a class="link" href="GstElement.html#GstStateChangeReturn" title="enum GstStateChangeReturn"><span class="type">GstStateChangeReturn</span></a> 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>elem</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to return the last state result for.</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-STATE-TARGET:CAPS"></a><h3>GST_STATE_TARGET()</h3>
<pre class="programlisting">#define GST_STATE_TARGET(elem) (GST_ELEMENT_CAST(elem)->target_state)
</pre>
<p>
This macro returns the target <a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> of the element.
</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>elem</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to return the target state for.</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-STATE-TRANSITION:CAPS"></a><h3>GST_STATE_TRANSITION()</h3>
<pre class="programlisting">#define GST_STATE_TRANSITION(cur,next) ((GstStateChange)(((cur)<<3)|(next)))
</pre>
<p>
Given a current state <em class="parameter"><code>cur</code></em> and a next state <em class="parameter"><code>next</code></em>, calculate the associated
<a class="link" href="GstElement.html#GstStateChange" title="enum GstStateChange"><span class="type">GstStateChange</span></a> transition.
</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>cur</code></em> :</span></p></td>
<td>A current state</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>next</code></em> :</span></p></td>
<td>A next state</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-STATE-TRANSITION-CURRENT:CAPS"></a><h3>GST_STATE_TRANSITION_CURRENT()</h3>
<pre class="programlisting">#define GST_STATE_TRANSITION_CURRENT(trans) ((GstState)((trans)>>3))
</pre>
<p>
Given a state transition <em class="parameter"><code>trans</code></em>, extract the current <a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</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"><em class="parameter"><code>trans</code></em> :</span></p></td>
<td>A <a class="link" href="GstElement.html#GstStateChange" title="enum GstStateChange"><span class="type">GstStateChange</span></a>
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-STATE-TRANSITION-NEXT:CAPS"></a><h3>GST_STATE_TRANSITION_NEXT()</h3>
<pre class="programlisting">#define GST_STATE_TRANSITION_NEXT(trans) ((GstState)((trans)&0x7))
</pre>
<p>
Given a state transition <em class="parameter"><code>trans</code></em>, extract the next <a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</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"><em class="parameter"><code>trans</code></em> :</span></p></td>
<td>A <a class="link" href="GstElement.html#GstStateChange" title="enum GstStateChange"><span class="type">GstStateChange</span></a>
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-STATE-GET-LOCK:CAPS"></a><h3>GST_STATE_GET_LOCK()</h3>
<pre class="programlisting">#define GST_STATE_GET_LOCK(elem) (&(GST_ELEMENT_CAST(elem)->state_lock))
</pre>
<p>
Get a reference to the state lock of <em class="parameter"><code>elem</code></em>.
This lock is used by the core. It is taken while getting or setting
the state, during state changes, and while finalizing.
</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>elem</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a>
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-STATE-GET-COND:CAPS"></a><h3>GST_STATE_GET_COND()</h3>
<pre class="programlisting">#define GST_STATE_GET_COND(elem) (&GST_ELEMENT_CAST(elem)->state_cond)
</pre>
<p>
Get the conditional used to signal the completion of a state change.
</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>elem</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a>
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-ELEMENT-NAME:CAPS"></a><h3>GST_ELEMENT_NAME()</h3>
<pre class="programlisting">#define GST_ELEMENT_NAME(elem) (GST_OBJECT_NAME(elem))
</pre>
<p>
Gets the name of this element. Use only in core as this is not
ABI-compatible. Others use <a class="link" href="GstElement.html#gst-element-get-name" title="gst_element_get_name()"><code class="function">gst_element_get_name()</code></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"><em class="parameter"><code>elem</code></em> :</span></p></td>
<td>A <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to query</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-ELEMENT-PARENT:CAPS"></a><h3>GST_ELEMENT_PARENT()</h3>
<pre class="programlisting">#define GST_ELEMENT_PARENT(elem) (GST_ELEMENT_CAST(GST_OBJECT_PARENT(elem)))
</pre>
<p>
Get the parent object of this element.
</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>elem</code></em> :</span></p></td>
<td>A <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to query</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-ELEMENT-BUS:CAPS"></a><h3>GST_ELEMENT_BUS()</h3>
<pre class="programlisting">#define GST_ELEMENT_BUS(elem) (GST_ELEMENT_CAST(elem)->bus)
</pre>
<p>
Get the message bus of this element.
</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>elem</code></em> :</span></p></td>
<td>A <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to query</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-ELEMENT-CLOCK:CAPS"></a><h3>GST_ELEMENT_CLOCK()</h3>
<pre class="programlisting">#define GST_ELEMENT_CLOCK(elem) (GST_ELEMENT_CAST(elem)->clock)
</pre>
<p>
Get the clock of this element
</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>elem</code></em> :</span></p></td>
<td>A <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to query</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-ELEMENT-PADS:CAPS"></a><h3>GST_ELEMENT_PADS()</h3>
<pre class="programlisting">#define GST_ELEMENT_PADS(elem) (GST_ELEMENT_CAST(elem)->pads)
</pre>
<p>
Get the pads of this elements.
</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>elem</code></em> :</span></p></td>
<td>A <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to query</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-ELEMENT-START-TIME:CAPS"></a><h3>GST_ELEMENT_START_TIME()</h3>
<pre class="programlisting">#define GST_ELEMENT_START_TIME(elem) (GST_ELEMENT_CAST(elem)->start_time)
</pre>
<p>
This macro returns the start_time of the <em class="parameter"><code>elem</code></em>. The start_time is the
running_time of the pipeline when the element went to PAUSED.
</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>elem</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to return the start time for.</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-ELEMENT-ERROR:CAPS"></a><h3>GST_ELEMENT_ERROR()</h3>
<pre class="programlisting">#define GST_ELEMENT_ERROR(el, domain, code, text, debug)</pre>
<p>
Utility function that elements can use in case they encountered a fatal
data processing error. The pipeline will post an error message and the
application will be requested to stop further media processing.
</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>el</code></em> :</span></p></td>
<td>the element that generates the error</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>domain</code></em> :</span></p></td>
<td>like CORE, LIBRARY, RESOURCE or STREAM (see <a class="link" href="gstreamer-GstGError.html" title="GstGError"><span class="type">gstreamer-GstGError</span></a>)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>code</code></em> :</span></p></td>
<td>error code defined for that domain (see <a class="link" href="gstreamer-GstGError.html" title="GstGError"><span class="type">gstreamer-GstGError</span></a>)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>text</code></em> :</span></p></td>
<td>the message to display (format string and args enclosed in
parentheses)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>debug</code></em> :</span></p></td>
<td>debugging information for the message (format string and args
enclosed in parentheses)</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-ELEMENT-WARNING:CAPS"></a><h3>GST_ELEMENT_WARNING()</h3>
<pre class="programlisting">#define GST_ELEMENT_WARNING(el, domain, code, text, debug)</pre>
<p>
Utility function that elements can use in case they encountered a non-fatal
data processing problem. The pipeline will post a warning message and the
application will be informed.
</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>el</code></em> :</span></p></td>
<td>the element that generates the warning</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>domain</code></em> :</span></p></td>
<td>like CORE, LIBRARY, RESOURCE or STREAM (see <a class="link" href="gstreamer-GstGError.html" title="GstGError"><span class="type">gstreamer-GstGError</span></a>)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>code</code></em> :</span></p></td>
<td>error code defined for that domain (see <a class="link" href="gstreamer-GstGError.html" title="GstGError"><span class="type">gstreamer-GstGError</span></a>)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>text</code></em> :</span></p></td>
<td>the message to display (format string and args enclosed in
parentheses)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>debug</code></em> :</span></p></td>
<td>debugging information for the message (format string and args
enclosed in parentheses)</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-ELEMENT-INFO:CAPS"></a><h3>GST_ELEMENT_INFO()</h3>
<pre class="programlisting">#define GST_ELEMENT_INFO(el, domain, code, text, debug)</pre>
<p>
Utility function that elements can use in case they want to inform
the application of something noteworthy that is not an error.
The pipeline will post a info message and the
application will be informed.
</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>el</code></em> :</span></p></td>
<td>the element that generates the information</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>domain</code></em> :</span></p></td>
<td>like CORE, LIBRARY, RESOURCE or STREAM (see <a class="link" href="gstreamer-GstGError.html" title="GstGError"><span class="type">gstreamer-GstGError</span></a>)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>code</code></em> :</span></p></td>
<td>error code defined for that domain (see <a class="link" href="gstreamer-GstGError.html" title="GstGError"><span class="type">gstreamer-GstGError</span></a>)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>text</code></em> :</span></p></td>
<td>the message to display (format string and args enclosed in
parentheses)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>debug</code></em> :</span></p></td>
<td>debugging information for the message (format string and args
enclosed in parentheses)</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-ELEMENT-IS-LOCKED-STATE:CAPS"></a><h3>GST_ELEMENT_IS_LOCKED_STATE()</h3>
<pre class="programlisting">#define GST_ELEMENT_IS_LOCKED_STATE(elem) (GST_OBJECT_FLAG_IS_SET(elem,GST_ELEMENT_FLAG_LOCKED_STATE))
</pre>
<p>
Check if the element is in the locked state and therefore will ignore state
changes from its parent object.
</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>elem</code></em> :</span></p></td>
<td>A <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to query</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-ELEMENT-METADATA-AUTHOR:CAPS"></a><h3>GST_ELEMENT_METADATA_AUTHOR</h3>
<pre class="programlisting">#define GST_ELEMENT_METADATA_AUTHOR "author"
</pre>
<p>
Name and contact details of the author(s). Use \n to separate
multiple author details.
E.g: "Joe Bloggs <joe.blogs at foo.com>"
</p>
</div>
<hr>
<div class="refsect2">
<a name="GST-ELEMENT-METADATA-DESCRIPTION:CAPS"></a><h3>GST_ELEMENT_METADATA_DESCRIPTION</h3>
<pre class="programlisting">#define GST_ELEMENT_METADATA_DESCRIPTION "description"
</pre>
<p>
Sentence describing the purpose of the element.
E.g: "Write stream to a file"
</p>
</div>
<hr>
<div class="refsect2">
<a name="GST-ELEMENT-METADATA-DOC-URI:CAPS"></a><h3>GST_ELEMENT_METADATA_DOC_URI</h3>
<pre class="programlisting">#define GST_ELEMENT_METADATA_DOC_URI "doc-uri"
</pre>
<p>
Set uri pointing to user documentation. Applications can use this to show
help for e.g. effects to users.
</p>
</div>
<hr>
<div class="refsect2">
<a name="GST-ELEMENT-METADATA-ICON-NAME:CAPS"></a><h3>GST_ELEMENT_METADATA_ICON_NAME</h3>
<pre class="programlisting">#define GST_ELEMENT_METADATA_ICON_NAME "icon-name"
</pre>
<p>
Elements that bridge to certain other products can include an icon of that
used product. Application can show the icon in menus/selectors to help
identifying specific elements.
</p>
</div>
<hr>
<div class="refsect2">
<a name="GST-ELEMENT-METADATA-KLASS:CAPS"></a><h3>GST_ELEMENT_METADATA_KLASS</h3>
<pre class="programlisting">#define GST_ELEMENT_METADATA_KLASS "klass"
</pre>
<p>
String describing the type of element, as an unordered list
separated with slashes ('/'). See draft-klass.txt of the design docs
for more details and common types. E.g: "Sink/File"
</p>
</div>
<hr>
<div class="refsect2">
<a name="GST-ELEMENT-METADATA-LONGNAME:CAPS"></a><h3>GST_ELEMENT_METADATA_LONGNAME</h3>
<pre class="programlisting">#define GST_ELEMENT_METADATA_LONGNAME "long-name"
</pre>
<p>
The long English name of the element. E.g. "File Sink"
</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-class-add-pad-template"></a><h3>gst_element_class_add_pad_template ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_element_class_add_pad_template (<em class="parameter"><code><a class="link" href="GstElement.html#GstElementClass" title="struct GstElementClass"><span class="type">GstElementClass</span></a> *klass</code></em>,
<em class="parameter"><code><a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="type">GstPadTemplate</span></a> *templ</code></em>);</pre>
<p>
Adds a padtemplate to an element class. This is mainly used in the _class_init
functions of classes. If a pad template with the same name as an already
existing one is added the old one is replaced by the new one.
</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>klass</code></em> :</span></p></td>
<td>the <a class="link" href="GstElement.html#GstElementClass" title="struct GstElementClass"><span class="type">GstElementClass</span></a> to add the pad template to.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>templ</code></em> :</span></p></td>
<td>a <a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="type">GstPadTemplate</span></a> to add to the element class. <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-element-class-get-pad-template"></a><h3>gst_element_class_get_pad_template ()</h3>
<pre class="programlisting"><a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="returnvalue">GstPadTemplate</span></a> * gst_element_class_get_pad_template (<em class="parameter"><code><a class="link" href="GstElement.html#GstElementClass" title="struct GstElementClass"><span class="type">GstElementClass</span></a> *element_class</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>
Retrieves a padtemplate from <em class="parameter"><code>element_class</code></em> with the given name.
</p>
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
<h3 class="title">Note</h3>If you use this function in the <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Type-Information.html#GInstanceInitFunc"><span class="type">GInstanceInitFunc</span></a> of an object class
that has subclasses, make sure to pass the g_class parameter of the
<a href="http://library.gnome.org/devel/gobject/unstable/gobject-Type-Information.html#GInstanceInitFunc"><span class="type">GInstanceInitFunc</span></a> here.</div>
<p>
</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>element_class</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html#GstElementClass" title="struct GstElementClass"><span class="type">GstElementClass</span></a> to get the pad template of.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
<td>the name of the <a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="type">GstPadTemplate</span></a> to get.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the <a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="type">GstPadTemplate</span></a> with the given name, or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>
if none was found. No unreferencing is necessary. <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-element-class-get-pad-template-list"></a><h3>gst_element_class_get_pad_template_list ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Doubly-Linked-Lists.html#GList"><span class="returnvalue">GList</span></a> * gst_element_class_get_pad_template_list
(<em class="parameter"><code><a class="link" href="GstElement.html#GstElementClass" title="struct GstElementClass"><span class="type">GstElementClass</span></a> *element_class</code></em>);</pre>
<p>
Retrieves a list of the pad templates associated with <em class="parameter"><code>element_class</code></em>. The
list must not be modified by the calling code.
</p>
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
<h3 class="title">Note</h3>If you use this function in the <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Type-Information.html#GInstanceInitFunc"><span class="type">GInstanceInitFunc</span></a> of an object class
that has subclasses, make sure to pass the g_class parameter of the
<a href="http://library.gnome.org/devel/gobject/unstable/gobject-Type-Information.html#GInstanceInitFunc"><span class="type">GInstanceInitFunc</span></a> here.</div>
<p>
</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>element_class</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html#GstElementClass" title="struct GstElementClass"><span class="type">GstElementClass</span></a> to get pad templates of.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the <a href="http://library.gnome.org/devel/glib/unstable/glib-Doubly-Linked-Lists.html#GList"><span class="type">GList</span></a> of
pad templates. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>][<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> Gst.PadTemplate]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-class-set-metadata"></a><h3>gst_element_class_set_metadata ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_element_class_set_metadata (<em class="parameter"><code><a class="link" href="GstElement.html#GstElementClass" title="struct GstElementClass"><span class="type">GstElementClass</span></a> *klass</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> *longname</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> *classification</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> *description</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> *author</code></em>);</pre>
<p>
Sets the detailed information for a <a class="link" href="GstElement.html#GstElementClass" title="struct GstElementClass"><span class="type">GstElementClass</span></a>.
</p>
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
<h3 class="title">Note</h3>This function is for use in _class_init functions only.</div>
<p>
</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>klass</code></em> :</span></p></td>
<td>class to set metadata for</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>longname</code></em> :</span></p></td>
<td>The long English name of the element. E.g. "File Sink"</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>classification</code></em> :</span></p></td>
<td>String describing the type of element, as an unordered list
separated with slashes ('/'). See draft-klass.txt of the design docs
for more details and common types. E.g: "Sink/File"</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>description</code></em> :</span></p></td>
<td>Sentence describing the purpose of the element.
E.g: "Write stream to a file"</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>author</code></em> :</span></p></td>
<td>Name and contact details of the author(s). Use \n to separate
multiple author metadata. E.g: "Joe Bloggs <joe.blogs at foo.com>"</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-class-set-static-metadata"></a><h3>gst_element_class_set_static_metadata ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_element_class_set_static_metadata
(<em class="parameter"><code><a class="link" href="GstElement.html#GstElementClass" title="struct GstElementClass"><span class="type">GstElementClass</span></a> *klass</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> *longname</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> *classification</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> *description</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> *author</code></em>);</pre>
<p>
Sets the detailed information for a <a class="link" href="GstElement.html#GstElementClass" title="struct GstElementClass"><span class="type">GstElementClass</span></a>.
</p>
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
<h3 class="title">Note</h3>This function is for use in _class_init functions only.</div>
<p>
</p>
<p>
Same as <a class="link" href="GstElement.html#gst-element-class-set-metadata" title="gst_element_class_set_metadata ()"><code class="function">gst_element_class_set_metadata()</code></a>, but <em class="parameter"><code>longname</code></em>, <em class="parameter"><code>classification</code></em>,
<em class="parameter"><code>description</code></em>, and <em class="parameter"><code>author</code></em> must be static strings or inlined strings, as
they will not be copied. (GStreamer plugins will be made resident once
loaded, so this function can be used even from dynamically loaded plugins.)
</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>klass</code></em> :</span></p></td>
<td>class to set metadata for</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>longname</code></em> :</span></p></td>
<td>The long English name of the element. E.g. "File Sink"</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>classification</code></em> :</span></p></td>
<td>String describing the type of element, as an unordered list
separated with slashes ('/'). See draft-klass.txt of the design docs
for more details and common types. E.g: "Sink/File"</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>description</code></em> :</span></p></td>
<td>Sentence describing the purpose of the element.
E.g: "Write stream to a file"</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>author</code></em> :</span></p></td>
<td>Name and contact details of the author(s). Use \n to separate
multiple author metadata. E.g: "Joe Bloggs <joe.blogs at foo.com>"</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-class-add-metadata"></a><h3>gst_element_class_add_metadata ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_element_class_add_metadata (<em class="parameter"><code><a class="link" href="GstElement.html#GstElementClass" title="struct GstElementClass"><span class="type">GstElementClass</span></a> *klass</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> *key</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> *value</code></em>);</pre>
<p>
Set <em class="parameter"><code>key</code></em> with <em class="parameter"><code>value</code></em> as metadata in <em class="parameter"><code>klass</code></em>.
</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>klass</code></em> :</span></p></td>
<td>class to set metadata for</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>key</code></em> :</span></p></td>
<td>the key to set</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>the value to set</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-class-add-static-metadata"></a><h3>gst_element_class_add_static_metadata ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_element_class_add_static_metadata
(<em class="parameter"><code><a class="link" href="GstElement.html#GstElementClass" title="struct GstElementClass"><span class="type">GstElementClass</span></a> *klass</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> *key</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> *value</code></em>);</pre>
<p>
Set <em class="parameter"><code>key</code></em> with <em class="parameter"><code>value</code></em> as metadata in <em class="parameter"><code>klass</code></em>.
</p>
<p>
Same as <a class="link" href="GstElement.html#gst-element-class-add-metadata" title="gst_element_class_add_metadata ()"><code class="function">gst_element_class_add_metadata()</code></a>, but <em class="parameter"><code>value</code></em> must be a static string
or an inlined string, as it will not be copied. (GStreamer plugins will
be made resident once loaded, so this function can be used even from
dynamically loaded plugins.)
</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>klass</code></em> :</span></p></td>
<td>class to set metadata for</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>key</code></em> :</span></p></td>
<td>the key to set</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>the value to set</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-add-pad"></a><h3>gst_element_add_pad ()</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_element_add_pad (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);</pre>
<p>
Adds a pad (link point) to <em class="parameter"><code>element</code></em>. <em class="parameter"><code>pad</code></em>'s parent will be set to <em class="parameter"><code>element</code></em>;
see <a class="link" href="GstObject.html#gst-object-set-parent" title="gst_object_set_parent ()"><code class="function">gst_object_set_parent()</code></a> for refcounting information.
</p>
<p>
Pads are not automatically activated so elements should perform the needed
steps to activate the pad in case this pad is added in the PAUSED or PLAYING
state. See <a class="link" href="GstPad.html#gst-pad-set-active" title="gst_pad_set_active ()"><code class="function">gst_pad_set_active()</code></a> for more information about activating pads.
</p>
<p>
The pad and the element should be unlocked when calling this function.
</p>
<p>
This function will emit the <a class="link" href="GstElement.html#GstElement-pad-added" title='The "pad-added" signal'><span class="type">"pad-added"</span></a> signal on the element.
</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>element</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to add the pad to.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to add to the element. <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>
<a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the pad could be added. This function can fail when
a pad with the same name already existed or the pad already had another
parent.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-create-all-pads"></a><h3>gst_element_create_all_pads ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_element_create_all_pads (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>);</pre>
<p>
Creates a pad for each pad template that is always available.
This function is only useful during object initialization of
subclasses of <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</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"><em class="parameter"><code>element</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to create pads for. <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-element-get-compatible-pad"></a><h3>gst_element_get_compatible_pad ()</h3>
<pre class="programlisting"><a class="link" href="GstPad.html" title="GstPad"><span class="returnvalue">GstPad</span></a> * gst_element_get_compatible_pad (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="type">GstCaps</span></a> *caps</code></em>);</pre>
<p>
Looks for an unlinked pad to which the given pad can link. It is not
guaranteed that linking the pads will work, though it should work in most
cases.
</p>
<p>
This function will first attempt to find a compatible unlinked ALWAYS pad,
and if none can be found, it will request a compatible REQUEST pad by looking
at the templates of <em class="parameter"><code>element</code></em>.
</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>element</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> in which the pad should be found. <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>pad</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to find a compatible one for. <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>caps</code></em> :</span></p></td>
<td>the <a class="link" href="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="type">GstCaps</span></a> to use as a filter. <span class="annotation">[<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to which a link can be made, or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>
if one cannot be found. <a class="link" href="GstObject.html#gst-object-unref" title="gst_object_unref ()"><code class="function">gst_object_unref()</code></a> after usage. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-get-compatible-pad-template"></a><h3>gst_element_get_compatible_pad_template ()</h3>
<pre class="programlisting"><a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="returnvalue">GstPadTemplate</span></a> * gst_element_get_compatible_pad_template
(<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="type">GstPadTemplate</span></a> *compattempl</code></em>);</pre>
<p>
Retrieves a pad template from <em class="parameter"><code>element</code></em> that is compatible with <em class="parameter"><code>compattempl</code></em>.
Pads from compatible templates can be linked together.
</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>element</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to get a compatible pad template for. <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>compattempl</code></em> :</span></p></td>
<td>the <a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="type">GstPadTemplate</span></a> to find a compatible
template for. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a compatible <a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="type">GstPadTemplate</span></a>, or NULL if none
was found. No unreferencing is necessary. <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-element-get-request-pad"></a><h3>gst_element_get_request_pad ()</h3>
<pre class="programlisting"><a class="link" href="GstPad.html" title="GstPad"><span class="returnvalue">GstPad</span></a> * gst_element_get_request_pad (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</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>
Retrieves a pad from the element by name (e.g. "src_%d"). This version only
retrieves request pads. The pad should be released with
<a class="link" href="GstElement.html#gst-element-release-request-pad" title="gst_element_release_request_pad ()"><code class="function">gst_element_release_request_pad()</code></a>.
</p>
<p>
This method is slow and will be deprecated in the future. New code should
use <a class="link" href="GstElement.html#gst-element-request-pad" title="gst_element_request_pad ()"><code class="function">gst_element_request_pad()</code></a> with the requested template.
</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>element</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to find a request pad of.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
<td>the name of the request <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to retrieve.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>requested <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> if found, otherwise <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.
Release after usage. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-get-static-pad"></a><h3>gst_element_get_static_pad ()</h3>
<pre class="programlisting"><a class="link" href="GstPad.html" title="GstPad"><span class="returnvalue">GstPad</span></a> * gst_element_get_static_pad (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</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>
Retrieves a pad from <em class="parameter"><code>element</code></em> by name. This version only retrieves
already-existing (i.e. 'static') pads.
</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>element</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to find a static pad of.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
<td>the name of the static <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to retrieve.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the requested <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> if found, otherwise <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.
unref after usage.
MT safe. <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-element-request-pad"></a><h3>gst_element_request_pad ()</h3>
<pre class="programlisting"><a class="link" href="GstPad.html" title="GstPad"><span class="returnvalue">GstPad</span></a> * gst_element_request_pad (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="type">GstPadTemplate</span></a> *templ</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>,
<em class="parameter"><code>const <a class="link" href="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="type">GstCaps</span></a> *caps</code></em>);</pre>
<p>
Retrieves a request pad from the element according to the provided template.
Pad templates can be looked up using
<a class="link" href="GstElementFactory.html#gst-element-factory-get-static-pad-templates" title="gst_element_factory_get_static_pad_templates ()"><code class="function">gst_element_factory_get_static_pad_templates()</code></a>.
</p>
<p>
The pad should be released with <a class="link" href="GstElement.html#gst-element-release-request-pad" title="gst_element_release_request_pad ()"><code class="function">gst_element_release_request_pad()</code></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"><em class="parameter"><code>element</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to find a request pad of.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>templ</code></em> :</span></p></td>
<td>a <a class="link" href="GstPadTemplate.html" title="GstPadTemplate"><span class="type">GstPadTemplate</span></a> of which we want a pad of.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
<td>the name of the request <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>
to retrieve. Can be <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>caps</code></em> :</span></p></td>
<td>the caps of the pad we want to
request. Can be <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>requested <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> if found, otherwise <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.
Release after usage. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-no-more-pads"></a><h3>gst_element_no_more_pads ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_element_no_more_pads (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>);</pre>
<p>
Use this function to signal that the element does not expect any more pads
to show up in the current pipeline. This function should be called whenever
pads have been added by the element itself. Elements with <a class="link" href="GstPadTemplate.html#GST-PAD-SOMETIMES:CAPS"><span class="type">GST_PAD_SOMETIMES</span></a>
pad templates use this in combination with autopluggers to figure out that
the element is done initializing its pads.
</p>
<p>
This function emits the <a class="link" href="GstElement.html#GstElement-no-more-pads" title='The "no-more-pads" signal'><span class="type">"no-more-pads"</span></a> signal.
</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>element</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a>
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-release-request-pad"></a><h3>gst_element_release_request_pad ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_element_release_request_pad (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);</pre>
<p>
Makes the element free the previously requested pad as obtained
with <a class="link" href="GstElement.html#gst-element-get-request-pad" title="gst_element_get_request_pad ()"><code class="function">gst_element_get_request_pad()</code></a>.
</p>
<p>
This does not unref the pad. If the pad was created by using
<a class="link" href="GstElement.html#gst-element-get-request-pad" title="gst_element_get_request_pad ()"><code class="function">gst_element_get_request_pad()</code></a>, <a class="link" href="GstElement.html#gst-element-release-request-pad" title="gst_element_release_request_pad ()"><code class="function">gst_element_release_request_pad()</code></a> needs to be
followed by <a class="link" href="GstObject.html#gst-object-unref" title="gst_object_unref ()"><code class="function">gst_object_unref()</code></a> to free the <em class="parameter"><code>pad</code></em>.
</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>element</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to release the request pad of.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to release.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-remove-pad"></a><h3>gst_element_remove_pad ()</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_element_remove_pad (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *pad</code></em>);</pre>
<p>
Removes <em class="parameter"><code>pad</code></em> from <em class="parameter"><code>element</code></em>. <em class="parameter"><code>pad</code></em> will be destroyed if it has not been
referenced elsewhere using <a class="link" href="GstObject.html#gst-object-unparent" title="gst_object_unparent ()"><code class="function">gst_object_unparent()</code></a>.
</p>
<p>
This function is used by plugin developers and should not be used
by applications. Pads that were dynamically requested from elements
with <a class="link" href="GstElement.html#gst-element-get-request-pad" title="gst_element_get_request_pad ()"><code class="function">gst_element_get_request_pad()</code></a> should be released with the
<a class="link" href="GstElement.html#gst-element-release-request-pad" title="gst_element_release_request_pad ()"><code class="function">gst_element_release_request_pad()</code></a> function instead.
</p>
<p>
Pads are not automatically deactivated so elements should perform the needed
steps to deactivate the pad in case this pad is removed in the PAUSED or
PLAYING state. See <a class="link" href="GstPad.html#gst-pad-set-active" title="gst_pad_set_active ()"><code class="function">gst_pad_set_active()</code></a> for more information about
deactivating pads.
</p>
<p>
The pad and the element should be unlocked when calling this function.
</p>
<p>
This function will emit the <a class="link" href="GstElement.html#GstElement-pad-removed" title='The "pad-removed" signal'><span class="type">"pad-removed"</span></a> signal on the element.
</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>element</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to remove pad from.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> to remove from the element. <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>
<a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the pad could be removed. Can return <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> if the
pad does not belong to the provided element.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-iterate-pads"></a><h3>gst_element_iterate_pads ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="returnvalue">GstIterator</span></a> * gst_element_iterate_pads (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>);</pre>
<p>
Retrieves an iterator of <em class="parameter"><code>element</code></em>'s pads. The iterator should
be freed after usage. Also more specialized iterators exists such as
<a class="link" href="GstElement.html#gst-element-iterate-src-pads" title="gst_element_iterate_src_pads ()"><code class="function">gst_element_iterate_src_pads()</code></a> or <a class="link" href="GstElement.html#gst-element-iterate-sink-pads" title="gst_element_iterate_sink_pads ()"><code class="function">gst_element_iterate_sink_pads()</code></a>.
</p>
<p>
The order of pads returned by the iterator will be the order in which
the pads were added to the element.
</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>element</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to iterate pads of.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the <a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="type">GstIterator</span></a> of <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>.
MT safe. <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-element-iterate-sink-pads"></a><h3>gst_element_iterate_sink_pads ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="returnvalue">GstIterator</span></a> * gst_element_iterate_sink_pads (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>);</pre>
<p>
Retrieves an iterator of <em class="parameter"><code>element</code></em>'s sink pads.
</p>
<p>
The order of pads returned by the iterator will be the order in which
the pads were added to the element.
</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>element</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the <a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="type">GstIterator</span></a> of <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>.
MT safe. <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-element-iterate-src-pads"></a><h3>gst_element_iterate_src_pads ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="returnvalue">GstIterator</span></a> * gst_element_iterate_src_pads (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>);</pre>
<p>
Retrieves an iterator of <em class="parameter"><code>element</code></em>'s source pads.
</p>
<p>
The order of pads returned by the iterator will be the order in which
the pads were added to the element.
</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>element</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the <a class="link" href="gstreamer-GstIterator.html#GstIterator" title="struct GstIterator"><span class="type">GstIterator</span></a> of <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>.
MT safe. <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-element-link"></a><h3>gst_element_link ()</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_element_link (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *dest</code></em>);</pre>
<p>
Links <em class="parameter"><code>src</code></em> to <em class="parameter"><code>dest</code></em>. The link must be from source to
destination; the other direction will not be tried. The function looks for
existing pads that aren't linked yet. It will request new pads if necessary.
Such pads need to be released manually when unlinking.
If multiple links are possible, only one is established.
</p>
<p>
Make sure you have added your elements to a bin or pipeline with
<a class="link" href="GstBin.html#gst-bin-add" title="gst_bin_add ()"><code class="function">gst_bin_add()</code></a> before trying to link 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"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> containing the source pad. <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>dest</code></em> :</span></p></td>
<td>the <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> containing the destination pad. <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 elements could be linked, FALSE otherwise.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-unlink"></a><h3>gst_element_unlink ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_element_unlink (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *dest</code></em>);</pre>
<p>
Unlinks all source pads of the source element with all sink pads
of the sink element to which they are linked.
</p>
<p>
If the link has been made using <a class="link" href="GstElement.html#gst-element-link" title="gst_element_link ()"><code class="function">gst_element_link()</code></a>, it could have created an
requestpad, which has to be released using <a class="link" href="GstElement.html#gst-element-release-request-pad" title="gst_element_release_request_pad ()"><code class="function">gst_element_release_request_pad()</code></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"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>the source <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to unlink. <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>dest</code></em> :</span></p></td>
<td>the sink <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to unlink. <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-element-link-many"></a><h3>gst_element_link_many ()</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_element_link_many (<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><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element_2</code></em>,
<em class="parameter"><code>...</code></em>);</pre>
<p>
Chain together a series of elements. Uses <a class="link" href="GstElement.html#gst-element-link" title="gst_element_link ()"><code class="function">gst_element_link()</code></a>.
Make sure you have added your elements to a bin or pipeline with
<a class="link" href="GstBin.html#gst-bin-add" title="gst_bin_add ()"><code class="function">gst_bin_add()</code></a> before trying to link 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"><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> in the link chain. <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>element_2</code></em> :</span></p></td>
<td>the second <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> in the link chain. <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>the NULL-terminated list of elements to link in order.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE on success, FALSE otherwise.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-unlink-many"></a><h3>gst_element_unlink_many ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_element_unlink_many (<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><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element_2</code></em>,
<em class="parameter"><code>...</code></em>);</pre>
<p>
Unlinks a series of elements. Uses <a class="link" href="GstElement.html#gst-element-unlink" title="gst_element_unlink ()"><code class="function">gst_element_unlink()</code></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"><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> in the link chain. <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>element_2</code></em> :</span></p></td>
<td>the second <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> in the link chain. <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>the NULL-terminated list of elements to unlink in order.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-link-pads"></a><h3>gst_element_link_pads ()</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_element_link_pads (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *src</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> *srcpadname</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *dest</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> *destpadname</code></em>);</pre>
<p>
Links the two named pads of the source and destination elements.
Side effect is that if one of the pads has no parent, it becomes a
child of the parent of the other element. If they have different
parents, the link fails.
</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>src</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> containing the source pad.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>srcpadname</code></em> :</span></p></td>
<td>the name of the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> in source element
or NULL for any pad. <span class="annotation">[<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dest</code></em> :</span></p></td>
<td>the <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> containing the destination pad. <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>destpadname</code></em> :</span></p></td>
<td>the name of the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> in destination element,
or NULL for any pad. <span class="annotation">[<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the pads could be linked, FALSE otherwise.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-link-pads-full"></a><h3>gst_element_link_pads_full ()</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_element_link_pads_full (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *src</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> *srcpadname</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *dest</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> *destpadname</code></em>,
<em class="parameter"><code><a class="link" href="GstPad.html#GstPadLinkCheck" title="enum GstPadLinkCheck"><span class="type">GstPadLinkCheck</span></a> flags</code></em>);</pre>
<p>
Links the two named pads of the source and destination elements.
Side effect is that if one of the pads has no parent, it becomes a
child of the parent of the other element. If they have different
parents, the link fails.
</p>
<p>
Calling <a class="link" href="GstElement.html#gst-element-link-pads-full" title="gst_element_link_pads_full ()"><code class="function">gst_element_link_pads_full()</code></a> with <em class="parameter"><code>flags</code></em> == <a class="link" href="GstPad.html#GST-PAD-LINK-CHECK-DEFAULT:CAPS"><code class="literal">GST_PAD_LINK_CHECK_DEFAULT</code></a>
is the same as calling <a class="link" href="GstElement.html#gst-element-link-pads" title="gst_element_link_pads ()"><code class="function">gst_element_link_pads()</code></a> and the recommended way of
linking pads with safety checks applied.
</p>
<p>
This is a convenience function for <a class="link" href="GstPad.html#gst-pad-link-full" title="gst_pad_link_full ()"><code class="function">gst_pad_link_full()</code></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"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> containing the source pad.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>srcpadname</code></em> :</span></p></td>
<td>the name of the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> in source element
or NULL for any pad. <span class="annotation">[<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dest</code></em> :</span></p></td>
<td>the <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> containing the destination pad. <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>destpadname</code></em> :</span></p></td>
<td>the name of the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> in destination element,
or NULL for any pad. <span class="annotation">[<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>flags</code></em> :</span></p></td>
<td>the <a class="link" href="GstPad.html#GstPadLinkCheck" title="enum GstPadLinkCheck"><span class="type">GstPadLinkCheck</span></a> to be performed when linking pads.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the pads could be linked, FALSE otherwise.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-unlink-pads"></a><h3>gst_element_unlink_pads ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_element_unlink_pads (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *src</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> *srcpadname</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *dest</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> *destpadname</code></em>);</pre>
<p>
Unlinks the two named pads of the source and destination elements.
</p>
<p>
This is a convenience function for <a class="link" href="GstPad.html#gst-pad-unlink" title="gst_pad_unlink ()"><code class="function">gst_pad_unlink()</code></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"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>a (transfer none): <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> containing the source pad.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>srcpadname</code></em> :</span></p></td>
<td>the name of the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> in source element.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dest</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> containing the destination pad. <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>destpadname</code></em> :</span></p></td>
<td>the name of the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> in destination element.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-link-pads-filtered"></a><h3>gst_element_link_pads_filtered ()</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_element_link_pads_filtered (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *src</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> *srcpadname</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *dest</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> *destpadname</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="type">GstCaps</span></a> *filter</code></em>);</pre>
<p>
Links the two named pads of the source and destination elements. Side effect
is that if one of the pads has no parent, it becomes a child of the parent of
the other element. If they have different parents, the link fails. If <em class="parameter"><code>caps</code></em>
is not <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><span class="type">NULL</span></a>, makes sure that the caps of the link is a subset of <em class="parameter"><code>caps</code></em>.
</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>src</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> containing the source pad.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>srcpadname</code></em> :</span></p></td>
<td>the name of the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> in source element
or NULL for any pad. <span class="annotation">[<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dest</code></em> :</span></p></td>
<td>the <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> containing the destination pad. <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>destpadname</code></em> :</span></p></td>
<td>the name of the <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> in destination element
or NULL for any pad. <span class="annotation">[<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>filter</code></em> :</span></p></td>
<td>the <a class="link" href="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="type">GstCaps</span></a> to filter the link,
or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><span class="type">NULL</span></a> for no filter. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the pads could be linked, FALSE otherwise.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-link-filtered"></a><h3>gst_element_link_filtered ()</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_element_link_filtered (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *dest</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="type">GstCaps</span></a> *filter</code></em>);</pre>
<p>
Links <em class="parameter"><code>src</code></em> to <em class="parameter"><code>dest</code></em> using the given caps as filtercaps.
The link must be from source to
destination; the other direction will not be tried. The function looks for
existing pads that aren't linked yet. It will request new pads if necessary.
If multiple links are possible, only one is established.
</p>
<p>
Make sure you have added your elements to a bin or pipeline with
<a class="link" href="GstBin.html#gst-bin-add" title="gst_bin_add ()"><code class="function">gst_bin_add()</code></a> before trying to link 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"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> containing the source pad.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dest</code></em> :</span></p></td>
<td>the <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> containing the destination pad. <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>filter</code></em> :</span></p></td>
<td>the <a class="link" href="gstreamer-GstCaps.html#GstCaps" title="struct GstCaps"><span class="type">GstCaps</span></a> to filter the link,
or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><span class="type">NULL</span></a> for no filter. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the pads could be linked, FALSE otherwise.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-class-get-metadata"></a><h3>gst_element_class_get_metadata ()</h3>
<pre class="programlisting">const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> * gst_element_class_get_metadata (<em class="parameter"><code><a class="link" href="GstElement.html#GstElementClass" title="struct GstElementClass"><span class="type">GstElementClass</span></a> *klass</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> *key</code></em>);</pre>
<p>
Get metadata with <em class="parameter"><code>key</code></em> in <em class="parameter"><code>klass</code></em>.
</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>klass</code></em> :</span></p></td>
<td>class to get metadata for</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>key</code></em> :</span></p></td>
<td>the key to get</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the metadata for <em class="parameter"><code>key</code></em>.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-set-base-time"></a><h3>gst_element_set_base_time ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_element_set_base_time (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> time</code></em>);</pre>
<p>
Set the base time of an element. See <a class="link" href="GstElement.html#gst-element-get-base-time" title="gst_element_get_base_time ()"><code class="function">gst_element_get_base_time()</code></a>.
</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>element</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>time</code></em> :</span></p></td>
<td>the base time to set.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-get-base-time"></a><h3>gst_element_get_base_time ()</h3>
<pre class="programlisting"><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="returnvalue">GstClockTime</span></a> gst_element_get_base_time (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>);</pre>
<p>
Returns the base time of the element. The base time is the
absolute time of the clock when this element was last put to
PLAYING. Subtracting the base time from the clock time gives
the running time of the element.
</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>element</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the base time of the element.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-set-start-time"></a><h3>gst_element_set_start_time ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_element_set_start_time (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> time</code></em>);</pre>
<p>
Set the start time of an element. The start time of the element is the
running time of the element when it last went to the PAUSED state. In READY
or after a flushing seek, it is set to 0.
</p>
<p>
Toplevel elements like <a class="link" href="GstPipeline.html" title="GstPipeline"><span class="type">GstPipeline</span></a> will manage the start_time and
base_time on its children. Setting the start_time to <a class="link" href="GstClock.html#GST-CLOCK-TIME-NONE:CAPS" title="GST_CLOCK_TIME_NONE"><span class="type">GST_CLOCK_TIME_NONE</span></a>
on such a toplevel element will disable the distribution of the base_time to
the children and can be useful if the application manages the base_time
itself, for example if you want to synchronize capture from multiple
pipelines, and you can also ensure that the pipelines have the same clock.
</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>element</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>time</code></em> :</span></p></td>
<td>the base time to set.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-get-start-time"></a><h3>gst_element_get_start_time ()</h3>
<pre class="programlisting"><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="returnvalue">GstClockTime</span></a> gst_element_get_start_time (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>);</pre>
<p>
Returns the start time of the element. The start time is the
running time of the clock when this element was last put to PAUSED.
</p>
<p>
Usually the start_time is managed by a toplevel element such as
<a class="link" href="GstPipeline.html" title="GstPipeline"><span class="type">GstPipeline</span></a>.
</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>element</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the start time of the element.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-set-bus"></a><h3>gst_element_set_bus ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_element_set_bus (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="GstBus.html" title="GstBus"><span class="type">GstBus</span></a> *bus</code></em>);</pre>
<p>
Sets the bus of the element. Increases the refcount on the bus.
For internal use only, unless you're testing elements.
</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>element</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to set the bus of.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>bus</code></em> :</span></p></td>
<td>the <a class="link" href="GstBus.html" title="GstBus"><span class="type">GstBus</span></a> to set. <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-element-get-bus"></a><h3>gst_element_get_bus ()</h3>
<pre class="programlisting"><a class="link" href="GstBus.html" title="GstBus"><span class="returnvalue">GstBus</span></a> * gst_element_get_bus (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>);</pre>
<p>
Returns the bus of the element. Note that only a <a class="link" href="GstPipeline.html" title="GstPipeline"><span class="type">GstPipeline</span></a> will provide a
bus for the application.
</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>element</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to get the bus of.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the element's <a class="link" href="GstBus.html" title="GstBus"><span class="type">GstBus</span></a>. unref after usage.
MT safe. <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-element-set-context"></a><h3>gst_element_set_context ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_element_set_context (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstContext.html#GstContext" title="GstContext"><span class="type">GstContext</span></a> *context</code></em>);</pre>
<p>
Sets the context of the element. Increases the refcount of the context.
</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>element</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to set the context of.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>context</code></em> :</span></p></td>
<td>the <a class="link" href="gstreamer-GstContext.html#GstContext" title="GstContext"><span class="type">GstContext</span></a> to set. <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-element-get-factory"></a><h3>gst_element_get_factory ()</h3>
<pre class="programlisting"><a class="link" href="GstElementFactory.html" title="GstElementFactory"><span class="returnvalue">GstElementFactory</span></a> * gst_element_get_factory (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>);</pre>
<p>
Retrieves the factory that was used to create this element.
</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>element</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to request the element factory of.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the <a class="link" href="GstElementFactory.html" title="GstElementFactory"><span class="type">GstElementFactory</span></a> used for creating this
element. no refcounting is needed. <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-element-set-name"></a><h3>gst_element_set_name()</h3>
<pre class="programlisting">#define gst_element_set_name(elem,name) gst_object_set_name(GST_OBJECT_CAST(elem),name)
</pre>
<p>
Sets the name of the element, getting rid of the old name if there was one.
</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>elem</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to set the name of.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
<td>the new name</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-get-name"></a><h3>gst_element_get_name()</h3>
<pre class="programlisting">#define gst_element_get_name(elem) gst_object_get_name(GST_OBJECT_CAST(elem))
</pre>
<p>
Returns a copy of the name of <em class="parameter"><code>elem</code></em>.
Caller should <a href="http://library.gnome.org/devel/glib/unstable/glib-Memory-Allocation.html#g-free"><code class="function">g_free()</code></a> the return value after usage.
For a nameless element, this returns NULL, which you can safely <a href="http://library.gnome.org/devel/glib/unstable/glib-Memory-Allocation.html#g-free"><code class="function">g_free()</code></a>
as well.
</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>elem</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to get the name of <em class="parameter"><code>elem</code></em>.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the name of <em class="parameter"><code>elem</code></em>. <a href="http://library.gnome.org/devel/glib/unstable/glib-Memory-Allocation.html#g-free"><code class="function">g_free()</code></a> after usage. MT safe. <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-element-set-parent"></a><h3>gst_element_set_parent()</h3>
<pre class="programlisting">#define gst_element_set_parent(elem,parent) gst_object_set_parent(GST_OBJECT_CAST(elem),parent)
</pre>
<p>
Sets the parent of an element.
</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>elem</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to set the parent of.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>parent</code></em> :</span></p></td>
<td>the new parent <a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> of the element.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-get-parent"></a><h3>gst_element_get_parent()</h3>
<pre class="programlisting">#define gst_element_get_parent(elem) gst_object_get_parent(GST_OBJECT_CAST(elem))
</pre>
<p>
Get the parent of an element.
</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>elem</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to get the parent of.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the parent of an element. <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-element-set-clock"></a><h3>gst_element_set_clock ()</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_element_set_clock (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> *clock</code></em>);</pre>
<p>
Sets the clock for the element. This function increases the
refcount on the clock. Any previously set clock on the object
is unreffed.
</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>element</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to set the clock for.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>clock</code></em> :</span></p></td>
<td>the <a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> to set for the element.</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 element accepted the clock. An element can refuse a
clock when it, for example, is not able to slave its internal clock to the
<em class="parameter"><code>clock</code></em> or when it requires a specific clock to operate.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-get-clock"></a><h3>gst_element_get_clock ()</h3>
<pre class="programlisting"><a class="link" href="GstClock.html" title="GstClock"><span class="returnvalue">GstClock</span></a> * gst_element_get_clock (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>);</pre>
<p>
Gets the currently configured clock of the element. This is the clock as was
last set with <a class="link" href="GstElement.html#gst-element-set-clock" title="gst_element_set_clock ()"><code class="function">gst_element_set_clock()</code></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"><em class="parameter"><code>element</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to get the clock of.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the <a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> of the element. unref after usage.
MT safe. <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-element-provide-clock"></a><h3>gst_element_provide_clock ()</h3>
<pre class="programlisting"><a class="link" href="GstClock.html" title="GstClock"><span class="returnvalue">GstClock</span></a> * gst_element_provide_clock (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>);</pre>
<p>
Get the clock provided by the given element.
</p>
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
<h3 class="title">Note</h3>An element is only required to provide a clock in the PAUSED
state. Some elements can provide a clock in other states.</div>
<p>
</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>element</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to query</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the GstClock provided by the element or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>
if no clock could be provided. Unref after usage.
MT safe. <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-element-set-state"></a><h3>gst_element_set_state ()</h3>
<pre class="programlisting"><a class="link" href="GstElement.html#GstStateChangeReturn" title="enum GstStateChangeReturn"><span class="returnvalue">GstStateChangeReturn</span></a> gst_element_set_state (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> state</code></em>);</pre>
<p>
Sets the state of the element. This function will try to set the
requested state by going through all the intermediary states and calling
the class's state change function for each.
</p>
<p>
This function can return <a class="link" href="GstElement.html#GST-STATE-CHANGE-ASYNC:CAPS"><span class="type">GST_STATE_CHANGE_ASYNC</span></a>, in which case the
element will perform the remainder of the state change asynchronously in
another thread.
An application can use <a class="link" href="GstElement.html#gst-element-get-state" title="gst_element_get_state ()"><code class="function">gst_element_get_state()</code></a> to wait for the completion
of the state change or it can wait for a <a class="link" href="gstreamer-GstMessage.html#GST-MESSAGE-ASYNC-DONE:CAPS"><code class="literal">GST_MESSAGE_ASYNC_DONE</code></a> or
<a class="link" href="gstreamer-GstMessage.html#GST-MESSAGE-STATE-CHANGED:CAPS"><code class="literal">GST_MESSAGE_STATE_CHANGED</code></a> on the bus.
</p>
<p>
State changes to <a class="link" href="GstElement.html#GST-STATE-READY:CAPS"><code class="literal">GST_STATE_READY</code></a> or <a class="link" href="GstElement.html#GST-STATE-NULL:CAPS"><code class="literal">GST_STATE_NULL</code></a> never return
<a class="link" href="GstElement.html#GST-STATE-CHANGE-ASYNC:CAPS"><span class="type">GST_STATE_CHANGE_ASYNC</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"><em class="parameter"><code>element</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to change state of.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>state</code></em> :</span></p></td>
<td>the element's new <a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>Result of the state change using <a class="link" href="GstElement.html#GstStateChangeReturn" title="enum GstStateChangeReturn"><span class="type">GstStateChangeReturn</span></a>.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-get-state"></a><h3>gst_element_get_state ()</h3>
<pre class="programlisting"><a class="link" href="GstElement.html#GstStateChangeReturn" title="enum GstStateChangeReturn"><span class="returnvalue">GstStateChangeReturn</span></a> gst_element_get_state (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> *state</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> *pending</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> timeout</code></em>);</pre>
<p>
Gets the state of the element.
</p>
<p>
For elements that performed an ASYNC state change, as reported by
<a class="link" href="GstElement.html#gst-element-set-state" title="gst_element_set_state ()"><code class="function">gst_element_set_state()</code></a>, this function will block up to the
specified timeout value for the state change to complete.
If the element completes the state change or goes into
an error, this function returns immediately with a return value of
<a class="link" href="GstElement.html#GST-STATE-CHANGE-SUCCESS:CAPS"><code class="literal">GST_STATE_CHANGE_SUCCESS</code></a> or <a class="link" href="GstElement.html#GST-STATE-CHANGE-FAILURE:CAPS"><code class="literal">GST_STATE_CHANGE_FAILURE</code></a> respectively.
</p>
<p>
For elements that did not return <a class="link" href="GstElement.html#GST-STATE-CHANGE-ASYNC:CAPS"><code class="literal">GST_STATE_CHANGE_ASYNC</code></a>, this function
returns the current and pending state immediately.
</p>
<p>
This function returns <a class="link" href="GstElement.html#GST-STATE-CHANGE-NO-PREROLL:CAPS"><code class="literal">GST_STATE_CHANGE_NO_PREROLL</code></a> if the element
successfully changed its state but is not able to provide data yet.
This mostly happens for live sources that only produce data in
<a class="link" href="GstElement.html#GST-STATE-PLAYING:CAPS"><code class="literal">GST_STATE_PLAYING</code></a>. While the state change return is equivalent to
<a class="link" href="GstElement.html#GST-STATE-CHANGE-SUCCESS:CAPS"><code class="literal">GST_STATE_CHANGE_SUCCESS</code></a>, it is returned to the application to signal that
some sink elements might not be able to complete their state change because
an element is not producing data to complete the preroll. When setting the
element to playing, the preroll will complete and playback will start.
</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>element</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to get the state of.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>state</code></em> :</span></p></td>
<td>a pointer to <a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> to hold the state.
Can be <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>pending</code></em> :</span></p></td>
<td>a pointer to <a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> to hold the pending
state. Can be <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>timeout</code></em> :</span></p></td>
<td>a <a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> to specify the timeout for an async
state change or <a class="link" href="GstClock.html#GST-CLOCK-TIME-NONE:CAPS" title="GST_CLOCK_TIME_NONE"><code class="literal">GST_CLOCK_TIME_NONE</code></a> for infinite timeout.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a class="link" href="GstElement.html#GST-STATE-CHANGE-SUCCESS:CAPS"><code class="literal">GST_STATE_CHANGE_SUCCESS</code></a> if the element has no more pending state
and the last state change succeeded, <a class="link" href="GstElement.html#GST-STATE-CHANGE-ASYNC:CAPS"><code class="literal">GST_STATE_CHANGE_ASYNC</code></a> if the
element is still performing a state change or
<a class="link" href="GstElement.html#GST-STATE-CHANGE-FAILURE:CAPS"><code class="literal">GST_STATE_CHANGE_FAILURE</code></a> if the last state change failed.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-set-locked-state"></a><h3>gst_element_set_locked_state ()</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_element_set_locked_state (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> locked_state</code></em>);</pre>
<p>
Locks the state of an element, so state changes of the parent don't affect
this element anymore.
</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>element</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>locked_state</code></em> :</span></p></td>
<td>TRUE to lock the element's state</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the state was changed, FALSE if bad parameters were given
or the elements state-locking needed no change.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-is-locked-state"></a><h3>gst_element_is_locked_state ()</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_element_is_locked_state (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>);</pre>
<p>
Checks if the state of an element is locked.
If the state of an element is locked, state changes of the parent don't
affect the element.
This way you can leave currently unused elements inside bins. Just lock their
state before changing the state from <a class="link" href="GstElement.html#GST-STATE-NULL:CAPS"><span class="type">GST_STATE_NULL</span></a>.
</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>element</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE, if the element's state is locked.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-abort-state"></a><h3>gst_element_abort_state ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_element_abort_state (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>);</pre>
<p>
Abort the state change of the element. This function is used
by elements that do asynchronous state changes and find out
something is wrong.
</p>
<p>
This function should be called with the STATE_LOCK held.
</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>element</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to abort the state of.</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-continue-state"></a><h3>gst_element_continue_state ()</h3>
<pre class="programlisting"><a class="link" href="GstElement.html#GstStateChangeReturn" title="enum GstStateChangeReturn"><span class="returnvalue">GstStateChangeReturn</span></a> gst_element_continue_state (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html#GstStateChangeReturn" title="enum GstStateChangeReturn"><span class="type">GstStateChangeReturn</span></a> ret</code></em>);</pre>
<p>
Commit the state change of the element and proceed to the next
pending state if any. This function is used
by elements that do asynchronous state changes.
The core will normally call this method automatically when an
element returned <a class="link" href="GstElement.html#GST-STATE-CHANGE-SUCCESS:CAPS"><code class="literal">GST_STATE_CHANGE_SUCCESS</code></a> from the state change function.
</p>
<p>
If after calling this method the element still has not reached
the pending state, the next state change is performed.
</p>
<p>
This method is used internally and should normally not be called by plugins
or applications.
</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>element</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to continue the state change of.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ret</code></em> :</span></p></td>
<td>The previous state return value</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The result of the commit state change.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-lost-state"></a><h3>gst_element_lost_state ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_element_lost_state (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>);</pre>
<p>
Brings the element to the lost state. The current state of the
element is copied to the pending state so that any call to
<a class="link" href="GstElement.html#gst-element-get-state" title="gst_element_get_state ()"><code class="function">gst_element_get_state()</code></a> will return <a class="link" href="GstElement.html#GST-STATE-CHANGE-ASYNC:CAPS"><code class="literal">GST_STATE_CHANGE_ASYNC</code></a>.
</p>
<p>
An ASYNC_START message is posted. If the element was PLAYING, it will
go to PAUSED. The element will be restored to its PLAYING state by
the parent pipeline when it prerolls again.
</p>
<p>
This is mostly used for elements that lost their preroll buffer
in the <a class="link" href="GstElement.html#GST-STATE-PAUSED:CAPS"><code class="literal">GST_STATE_PAUSED</code></a> or <a class="link" href="GstElement.html#GST-STATE-PLAYING:CAPS"><code class="literal">GST_STATE_PLAYING</code></a> state after a flush,
they will go to their pending state again when a new preroll buffer is
queued. This function can only be called when the element is currently
not in error or an async state change.
</p>
<p>
This function is used internally and should normally not be called from
plugins or applications.
</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>element</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> the state is lost of</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-state-get-name"></a><h3>gst_element_state_get_name ()</h3>
<pre class="programlisting">const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> * gst_element_state_get_name (<em class="parameter"><code><a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> state</code></em>);</pre>
<p>
Gets a string representing the given state.
</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>state</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> to get the name of.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a string with the name of the state. <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-element-state-change-return-get-name"></a><h3>gst_element_state_change_return_get_name ()</h3>
<pre class="programlisting">const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> * gst_element_state_change_return_get_name
(<em class="parameter"><code><a class="link" href="GstElement.html#GstStateChangeReturn" title="enum GstStateChangeReturn"><span class="type">GstStateChangeReturn</span></a> state_ret</code></em>);</pre>
<p>
Gets a string representing the given state change result.
</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>state_ret</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html#GstStateChangeReturn" title="enum GstStateChangeReturn"><span class="type">GstStateChangeReturn</span></a> to get the name of.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a string with the name of the state
result. <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-element-sync-state-with-parent"></a><h3>gst_element_sync_state_with_parent ()</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_element_sync_state_with_parent (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>);</pre>
<p>
Tries to change the state of the element to the same as its parent.
If this function returns FALSE, the state of element is undefined.
</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>element</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE, if the element's state could be synced to the parent's state.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-change-state"></a><h3>gst_element_change_state ()</h3>
<pre class="programlisting"><a class="link" href="GstElement.html#GstStateChangeReturn" title="enum GstStateChangeReturn"><span class="returnvalue">GstStateChangeReturn</span></a> gst_element_change_state (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html#GstStateChange" title="enum GstStateChange"><span class="type">GstStateChange</span></a> transition</code></em>);</pre>
<p>
Perform <em class="parameter"><code>transition</code></em> on <em class="parameter"><code>element</code></em>.
</p>
<p>
This function must be called with STATE_LOCK held and is mainly used
internally.
</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>element</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>transition</code></em> :</span></p></td>
<td>the requested transition</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#GstStateChangeReturn" title="enum GstStateChangeReturn"><span class="type">GstStateChangeReturn</span></a> of the state transition.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-message-full"></a><h3>gst_element_message_full ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_element_message_full (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessageType" title="enum GstMessageType"><span class="type">GstMessageType</span></a> type</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> domain</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> code</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *text</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *debug</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> *file</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> *function</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> line</code></em>);</pre>
<p>
Post an error, warning or info message on the bus from inside an element.
</p>
<p>
<em class="parameter"><code>type</code></em> must be of <a class="link" href="gstreamer-GstMessage.html#GST-MESSAGE-ERROR:CAPS"><span class="type">GST_MESSAGE_ERROR</span></a>, <a class="link" href="gstreamer-GstMessage.html#GST-MESSAGE-WARNING:CAPS"><span class="type">GST_MESSAGE_WARNING</span></a> or
<a class="link" href="gstreamer-GstMessage.html#GST-MESSAGE-INFO:CAPS"><span class="type">GST_MESSAGE_INFO</span></a>.
</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>element</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to send message from</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>type</code></em> :</span></p></td>
<td>the <a class="link" href="gstreamer-GstMessage.html#GstMessageType" title="enum GstMessageType"><span class="type">GstMessageType</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>domain</code></em> :</span></p></td>
<td>the GStreamer GError domain this message belongs to</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>code</code></em> :</span></p></td>
<td>the GError code belonging to the domain</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>text</code></em> :</span></p></td>
<td>an allocated text string to be used
as a replacement for the default message connected to code,
or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. <span class="annotation">[<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>][<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>debug</code></em> :</span></p></td>
<td>an allocated debug message to be
used as a replacement for the default debugging information,
or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. <span class="annotation">[<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>][<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>file</code></em> :</span></p></td>
<td>the source code file where the error was generated</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>function</code></em> :</span></p></td>
<td>the source code function where the error was generated</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>line</code></em> :</span></p></td>
<td>the source code line where the error was generated</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-post-message"></a><h3>gst_element_post_message ()</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_element_post_message (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>);</pre>
<p>
Post a message on the element's <a class="link" href="GstBus.html" title="GstBus"><span class="type">GstBus</span></a>. This function takes ownership of the
message; if you want to access the message after this call, you should add an
additional reference before calling.
</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>element</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> posting the message</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>a <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> to post. <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>
<a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the message was successfully posted. The function returns
<a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> if the element did not have a bus.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-query"></a><h3>gst_element_query ()</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_element_query (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstQuery.html#GstQuery" title="struct GstQuery"><span class="type">GstQuery</span></a> *query</code></em>);</pre>
<p>
Performs a query on the given element.
</p>
<p>
For elements that don't implement a query handler, this function
forwards the query to a random srcpad or to the peer of a
random linked sinkpad of this element.
</p>
<p>
Please note that some queries might need a running pipeline to work.
</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>element</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to perform the query on.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>query</code></em> :</span></p></td>
<td>the <a class="link" href="gstreamer-GstQuery.html#GstQuery" title="struct GstQuery"><span class="type">GstQuery</span></a>. <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 query could be performed.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-query-convert"></a><h3>gst_element_query_convert ()</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_element_query_convert (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> src_format</code></em>,
<em class="parameter"><code><span class="type">gint64</span> src_val</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> dest_format</code></em>,
<em class="parameter"><code><span class="type">gint64</span> *dest_val</code></em>);</pre>
<p>
Queries an element to convert <em class="parameter"><code>src_val</code></em> in <em class="parameter"><code>src_format</code></em> to <em class="parameter"><code>dest_format</code></em>.
</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>element</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to invoke the convert query on.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>src_format</code></em> :</span></p></td>
<td>a <a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> to convert from. <span class="annotation">[<acronym title="Parameter for input and for returning results. Default is transfer full."><span class="acronym">inout</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>src_val</code></em> :</span></p></td>
<td>a value to convert.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dest_format</code></em> :</span></p></td>
<td>the <a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> to convert to.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dest_val</code></em> :</span></p></td>
<td>a pointer to the result. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</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 query could be performed.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-query-position"></a><h3>gst_element_query_position ()</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_element_query_position (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> format</code></em>,
<em class="parameter"><code><span class="type">gint64</span> *cur</code></em>);</pre>
<p>
Queries an element (usually top-level pipeline or playbin element) for the
stream position in nanoseconds. This will be a value between 0 and the
stream duration (if the stream duration is known). This query will usually
only work once the pipeline is prerolled (i.e. reached PAUSED or PLAYING
state). The application will receive an ASYNC_DONE message on the pipeline
bus when that is the case.
</p>
<p>
If one repeatedly calls this function one can also create a query and reuse
it in <a class="link" href="GstElement.html#gst-element-query" title="gst_element_query ()"><code class="function">gst_element_query()</code></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"><em class="parameter"><code>element</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to invoke the position query on.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>format</code></em> :</span></p></td>
<td>the <a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> requested</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>cur</code></em> :</span></p></td>
<td>a location in which to store the current
position, or NULL. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-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 query could be performed.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-query-duration"></a><h3>gst_element_query_duration ()</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_element_query_duration (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> format</code></em>,
<em class="parameter"><code><span class="type">gint64</span> *duration</code></em>);</pre>
<p>
Queries an element (usually top-level pipeline or playbin element) for the
total stream duration in nanoseconds. This query will only work once the
pipeline is prerolled (i.e. reached PAUSED or PLAYING state). The application
will receive an ASYNC_DONE message on the pipeline bus when that is the case.
</p>
<p>
If the duration changes for some reason, you will get a DURATION_CHANGED
message on the pipeline bus, in which case you should re-query the duration
using this function.
</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>element</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to invoke the duration query on.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>format</code></em> :</span></p></td>
<td>the <a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> requested</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>duration</code></em> :</span></p></td>
<td>A location in which to store the total duration, or NULL. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-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 query could be performed.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-send-event"></a><h3>gst_element_send_event ()</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_element_send_event (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstEvent.html#GstEvent" title="struct GstEvent"><span class="type">GstEvent</span></a> *event</code></em>);</pre>
<p>
Sends an event to an element. If the element doesn't implement an
event handler, the event will be pushed on a random linked sink pad for
upstream events or a random linked source pad for downstream events.
</p>
<p>
This function takes owership of the provided event so you should
<a class="link" href="gstreamer-GstEvent.html#gst-event-ref" title="gst_event_ref ()"><code class="function">gst_event_ref()</code></a> it if you want to reuse the event after this call.
</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>element</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to send the event to.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>event</code></em> :</span></p></td>
<td>the <a class="link" href="gstreamer-GstEvent.html#GstEvent" title="struct GstEvent"><span class="type">GstEvent</span></a> to send to the element. <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>
<a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the event was handled. Events that trigger a preroll (such
as flushing seeks and steps) will emit <a class="link" href="gstreamer-GstMessage.html#GST-MESSAGE-ASYNC-DONE:CAPS"><code class="literal">GST_MESSAGE_ASYNC_DONE</code></a>.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-seek-simple"></a><h3>gst_element_seek_simple ()</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_element_seek_simple (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> format</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstEvent.html#GstSeekFlags" title="enum GstSeekFlags"><span class="type">GstSeekFlags</span></a> seek_flags</code></em>,
<em class="parameter"><code><span class="type">gint64</span> seek_pos</code></em>);</pre>
<p>
Simple API to perform a seek on the given element, meaning it just seeks
to the given position relative to the start of the stream. For more complex
operations like segment seeks (e.g. for looping) or changing the playback
rate or seeking relative to the last configured playback segment you should
use <a class="link" href="GstElement.html#gst-element-seek" title="gst_element_seek ()"><code class="function">gst_element_seek()</code></a>.
</p>
<p>
In a completely prerolled PAUSED or PLAYING pipeline, seeking is always
guaranteed to return <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> on a seekable media type or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> when the media
type is certainly not seekable (such as a live stream).
</p>
<p>
Some elements allow for seeking in the READY state, in this
case they will store the seek event and execute it when they are put to
PAUSED. If the element supports seek in READY, it will always return <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> when
it receives the event in the READY state.
</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>element</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to seek on</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>format</code></em> :</span></p></td>
<td>a <a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> to execute the seek in, such as <a class="link" href="gstreamer-GstFormat.html#GST-FORMAT-TIME:CAPS"><span class="type">GST_FORMAT_TIME</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>seek_flags</code></em> :</span></p></td>
<td>seek options; playback applications will usually want to use
GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_KEY_UNIT here</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>seek_pos</code></em> :</span></p></td>
<td>position to seek to (relative to the start); if you are doing
a seek in <a class="link" href="gstreamer-GstFormat.html#GST-FORMAT-TIME:CAPS"><span class="type">GST_FORMAT_TIME</span></a> this value is in nanoseconds -
multiply with <a class="link" href="GstClock.html#GST-SECOND:CAPS" title="GST_SECOND"><span class="type">GST_SECOND</span></a> to convert seconds to nanoseconds or
with <a class="link" href="GstClock.html#GST-MSECOND:CAPS" title="GST_MSECOND"><span class="type">GST_MSECOND</span></a> to convert milliseconds to nanoseconds.</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 seek operation succeeded. Flushing seeks will trigger a
preroll, which will emit <a class="link" href="gstreamer-GstMessage.html#GST-MESSAGE-ASYNC-DONE:CAPS"><code class="literal">GST_MESSAGE_ASYNC_DONE</code></a>.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-element-seek"></a><h3>gst_element_seek ()</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_element_seek (<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *element</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> rate</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> format</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstEvent.html#GstSeekFlags" title="enum GstSeekFlags"><span class="type">GstSeekFlags</span></a> flags</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstEvent.html#GstSeekType" title="enum GstSeekType"><span class="type">GstSeekType</span></a> start_type</code></em>,
<em class="parameter"><code><span class="type">gint64</span> start</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstEvent.html#GstSeekType" title="enum GstSeekType"><span class="type">GstSeekType</span></a> stop_type</code></em>,
<em class="parameter"><code><span class="type">gint64</span> stop</code></em>);</pre>
<p>
Sends a seek event to an element. See <a class="link" href="gstreamer-GstEvent.html#gst-event-new-seek" title="gst_event_new_seek ()"><code class="function">gst_event_new_seek()</code></a> for the details of
the parameters. The seek event is sent to the element using
<a class="link" href="GstElement.html#gst-element-send-event" title="gst_element_send_event ()"><code class="function">gst_element_send_event()</code></a>.
</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>element</code></em> :</span></p></td>
<td>a <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> to send the event to.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>rate</code></em> :</span></p></td>
<td>The new playback rate</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>format</code></em> :</span></p></td>
<td>The format of the seek values</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>flags</code></em> :</span></p></td>
<td>The optional seek flags.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>start_type</code></em> :</span></p></td>
<td>The type and flags for the new start position</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>start</code></em> :</span></p></td>
<td>The value of the new start position</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>stop_type</code></em> :</span></p></td>
<td>The type and flags for the new stop position</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>stop</code></em> :</span></p></td>
<td>The value of the new stop position</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 event was handled. Flushing seeks will trigger a
preroll, which will emit <a class="link" href="gstreamer-GstMessage.html#GST-MESSAGE-ASYNC-DONE:CAPS"><code class="literal">GST_MESSAGE_ASYNC_DONE</code></a>.</td>
</tr>
</tbody>
</table></div>
</div>
</div>
<div class="refsect1">
<a name="GstElement.signal-details"></a><h2>Signal Details</h2>
<div class="refsect2">
<a name="GstElement-no-more-pads"></a><h3>The <code class="literal">"no-more-pads"</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">void</span> user_function (<a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *gstelement,
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data) : <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS"><code class="literal">Run Last</code></a></pre>
<p>
This signals that the element will not generate more dynamic pads.
Note that this signal will usually be emitted from the context of
the streaming thread.
</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>gstelement</code></em> :</span></p></td>
<td>the object which received the signal</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="GstElement-pad-added"></a><h3>The <code class="literal">"pad-added"</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">void</span> user_function (<a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *gstelement,
<a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *new_pad,
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data) : <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS"><code class="literal">Run Last</code></a></pre>
<p>
a new <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> has been added to the element. Note that this signal will
usually be emitted from the context of the streaming thread. Also keep in
mind that if you add new elements to the pipeline in the signal handler
you will need to set them to the desired target state 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 <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>.
</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>gstelement</code></em> :</span></p></td>
<td>the object which received the signal</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>new_pad</code></em> :</span></p></td>
<td>the pad that has been added</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="GstElement-pad-removed"></a><h3>The <code class="literal">"pad-removed"</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">void</span> user_function (<a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *gstelement,
<a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> *old_pad,
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data) : <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS"><code class="literal">Run Last</code></a></pre>
<p>
a <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a> has been removed from the element
</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>gstelement</code></em> :</span></p></td>
<td>the object which received the signal</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>old_pad</code></em> :</span></p></td>
<td>the pad that has been removed</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data set when the signal handler was connected.</td>
</tr>
</tbody>
</table></div>
</div>
</div>
<div class="refsect1">
<a name="GstElement.see-also"></a><h2>See Also</h2>
<a class="link" href="GstElementFactory.html" title="GstElementFactory"><span class="type">GstElementFactory</span></a>, <a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>
</div>
</div>
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