gstreamer/docs/manual/plugins.sgml
Richard Boulton 1eb9c731cf Fix a few more issues shown up by gnome-db2html2 - %'s should be written as % (was causing gnome-db2html2 to s...
Original commit message from CVS:
Fix a few more issues shown up by gnome-db2html2 - %'s should be written
as % (was causing gnome-db2html2 to segfault, though I've a patch
for them to fix that).  Also correct an id which appeared twice.
2001-02-16 16:48:54 +00:00

63 lines
1.7 KiB
Text

<chapter id="cha-plugins">
<title>What are Plugins</title>
<para>
A plugin is a shared library that contains at least one of the following items:
</para>
<itemizedlist>
<listitem>
<para>
one or more elementfactories
</para>
</listitem>
<listitem>
<para>
one or more typedefinitions
</para>
</listitem>
</itemizedlist>
<para>
The plugins have one simple method: plugin_init () where all the elementfactories are
created and the typedefinitions are registered.
</para>
<para>
the plugins are maintained in the plugin system. Optionally, the typedefinitions and
the elementfactories can be saved into an XML representation so that the plugin system
does not have to load all available plugins in order to know their definition.
</para>
<para>
The basic plugin structure has the following fields:
</para>
<programlisting>
struct _GstPlugin {
gchar *name; /* name of the plugin */
gchar *longname; /* long name of plugin */
gchar *filename; /* filename it came from */
GList *types; /* list of types provided */
gint numtypes;
GList *elements; /* list of elements provided */
gint numelements;
gboolean loaded; /* if the plugin is in memory */
};
</programlisting>
<para>
You can query a GList of available plugins with:
</para>
<programlisting>
GList *plugins;
plugins = gst_plugin_get_list ();
while (plugins) {
GstPlugin *plugin = (GstPlugin *)plugins-&gt;data;
g_print ("plugin: &percnt;s\n", gst_plugin_get_name (plugin));
plugins = g_list_next (plugins);
}
</programlisting>
</chapter>