gstreamer/docs/gst/tmpl/gstelementfactory.sgml
Wim Taymans 29e2850eff Documentation updates
Original commit message from CVS:
Documentation updates
2002-12-14 13:02:16 +00:00

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<!-- ##### SECTION Title ##### -->
GstElementFactory
<!-- ##### SECTION Short_Description ##### -->
Create GstElements from a factory
<!-- ##### SECTION Long_Description ##### -->
<para>
GstElementFactory is used to create instances of elements. A GstElementfactory
can be added to a #GstPlugin as it is also a #GstPluginFeature.
</para>
<para>
Use gst_element_factory_new() to create a new factory which can be added to a plugin
with gst_plugin_add_feature().
</para>
<para>
gst_element_factory_add_pad_template() is used to add a padtemplate to the factory.
This function will enable the application to query for elementfactories that handle
a specific media type.
</para>
<para>
Use the gst_element_factory_find() and gst_element_factory_create() functions
to create element instances or use gst_element_factory_make() as a convenient
shortcut.
</para>
<para>
The following code example shows you how to create a GstFileSrc element.
</para>
<para>
<programlisting role="C">
#include &lt;gst/gst.h&gt;
GstElement *src;
GstElementFactory *srcfactory;
gst_init(&amp;argc,&amp;argv);
srcfactory = gst_element_factory_find("filesrc");
g_return_if_fail(srcfactory != NULL);
src = gst_element_factory_create(srcfactory,"src");
g_return_if_fail(src != NULL);
...
</programlisting>
</para>
<para>
An elementfactory can be assigned a rank with gst_element_factory_set_rank()
so that the autopluggers can select a plugin more appropriatly
</para>
<!-- ##### SECTION See_Also ##### -->
<para>
#GstElement, #GstPlugin, #GstPluginFeature, #GstPadTemplate.
</para>
<!-- ##### STRUCT GstElementDetails ##### -->
<para>
This struct is used to define public information about the element. It
describes the element, mostly for the benefit of editors.
</para>
@longname:
@klass:
@license:
@description:
@version:
@author:
@copyright:
<!-- ##### FUNCTION gst_element_factory_new ##### -->
<para>
</para>
@name:
@type:
@details:
@Returns:
<!-- ##### FUNCTION gst_element_factory_find ##### -->
<para>
</para>
@name:
@Returns:
<!-- ##### FUNCTION gst_element_factory_add_pad_template ##### -->
<para>
</para>
@elementfactory:
@templ:
<!-- ##### FUNCTION gst_element_factory_can_src_caps ##### -->
<para>
</para>
@factory:
@caps:
@Returns:
<!-- ##### FUNCTION gst_element_factory_can_sink_caps ##### -->
<para>
</para>
@factory:
@caps:
@Returns:
<!-- ##### FUNCTION gst_element_factory_create ##### -->
<para>
</para>
@factory:
@name:
@Returns:
<!-- ##### FUNCTION gst_element_factory_make ##### -->
<para>
</para>
@factoryname:
@name:
@Returns:
<!-- ##### FUNCTION gst_element_factory_make_or_warn ##### -->
<para>
</para>
@factoryname:
@name:
@Returns:
<!-- ##### FUNCTION gst_element_factory_set_rank ##### -->
<para>
</para>
@factory:
@rank:
<!-- ##### MACRO GST_ELEMENT_RANK_MARGINAL ##### -->
<para>
The element is only marginally usefull for autoplugging
</para>
<!-- ##### MACRO GST_ELEMENT_RANK_NONE ##### -->
<para>
The plugin may not be used in autoplugging
</para>
<!-- ##### MACRO GST_ELEMENT_RANK_PRIMARY ##### -->
<para>
The plugin is well suited for autoplugging
</para>
<!-- ##### MACRO GST_ELEMENT_RANK_SECONDARY ##### -->
<para>
The plugin is suited for autoplugging but only as a second
candidate.
</para>