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<chapter id="chapter-compiling">
<title>Compiling</title>
<para>
This section talks about the different things you can do when building
and shipping your applications and plugins.
</para>
<sect1 id="section-compiling-embedding">
<title>Embedding static elements in your application</title>
<para>
The <ulink type="http"
url="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/pwg/html/index.html">Plugin
Writer's Guide</ulink> describes in great detail how to write elements
for the &GStreamer; framework. In this section, we will solely discuss
how to embed such elements statically in your application. This can be
useful for application-specific elements that have no use elsewhere in
&GStreamer;.
</para>
<para>
Dynamically loaded plugins contain a structure that's defined using
<function>GST_PLUGIN_DEFINE ()</function>. This structure is loaded
when the plugin is loaded by the &GStreamer; core. The structure
contains an initialization function (usually called
<function>plugin_init</function>) that will be called right after that.
It's purpose is to register the elements provided by the plugin with
the &GStreamer; framework.
If you want to embed elements directly in
your application, the only thing you need to do is to replace
<function>GST_PLUGIN_DEFINE ()</function> with a call to
<function>gst_plugin_register_static ()</function>. As soon as you
call <function>gst_plugin_register_static ()</function>, the elements
will from then on be available like any other element, without them
having to be dynamically loadable libraries. In the example below, you
would be able to call <function>gst_element_factory_make
("my-element-name", "some-name")</function> to create an instance of the
element.
</para>
<programlisting>
<![CDATA[
/*
* Here, you would write the actual plugin code.
*/
[..]
static gboolean
register_elements (GstPlugin *plugin)
{
return gst_element_register (plugin, "my-element-name",
GST_RANK_NONE, MY_PLUGIN_TYPE);
}
static
my_code_init (void)
{
...
gst_plugin_register_static (
GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"my-private-plugins",
"Private elements of my application",
register_elements,
VERSION,
"LGPL",
"my-application-source",
"my-application",
"http://www.my-application.net/")
...
}
]]>
</programlisting>
</sect1>
</chapter>
|
