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><A
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>5.3. Using an element as a <CODE
CLASS="classname"
>GObject</CODE
></A
></H1
><P
>
A <A
HREF="http://gstreamer.freedesktop.org/data/doc/gstreamer/stable/gstreamer/html/GstElement.html"
TARGET="_top"
><CODE
CLASS="classname"
>GstElement</CODE
></A
>
can have several properties which are implemented using standard
<CODE
CLASS="classname"
>GObject</CODE
> properties. The usual
<CODE
CLASS="classname"
>GObject</CODE
> methods to query, set and get
property values and <CODE
CLASS="classname"
>GParamSpecs</CODE
> are
therefore supported.
</P
><P
>
Every <CODE
CLASS="classname"
>GstElement</CODE
> inherits at least one
property from its parent <CODE
CLASS="classname"
>GstObject</CODE
>: the
"name" property. This is the name you provide to the functions
<CODE
CLASS="function"
>gst_element_factory_make ()</CODE
> or
<CODE
CLASS="function"
>gst_element_factory_create ()</CODE
>. You can get
and set this property using the functions
<CODE
CLASS="function"
>gst_object_set_name</CODE
> and
<CODE
CLASS="function"
>gst_object_get_name</CODE
> or use the
<CODE
CLASS="classname"
>GObject</CODE
> property mechanism as shown below.
</P
><PRE
CLASS="programlisting"
> #include <gst/gst.h>
int
main (int argc,
char *argv[])
{
GstElement *element;
gchar *name;
/* init GStreamer */
gst_init (&argc, &argv);
/* create element */
element = gst_element_factory_make ("fakesrc", "source");
/* get name */
g_object_get (G_OBJECT (element), "name", &name, NULL);
g_print ("The name of the element is '%s'.\n", name);
g_free (name);
gst_object_unref (GST_OBJECT (element));
return 0;
}
</PRE
><P
> Most plugins provide additional properties to provide more information
about their configuration or to configure the element.
<B
CLASS="command"
>gst-inspect</B
> is a useful tool to query the properties
of a particular element, it will also use property introspection to give
a short explanation about the function of the property and about the
parameter types and ranges it supports. See
<A
HREF="section-checklist-applications.html#section-applications-inspect"
>Section 21.4.2</A
>
in the appendix for details about <B
CLASS="command"
>gst-inspect</B
>.
</P
><P
> For more information about <CODE
CLASS="classname"
>GObject</CODE
>
properties we recommend you read the <A
HREF="http://developer.gnome.org/doc/API/2.0/gobject/index.html"
TARGET="_top"
>GObject manual</A
> and an introduction to <A
HREF="http://developer.gnome.org/doc/API/2.0/gobject/pr01.html"
TARGET="_top"
> The Glib Object system</A
>.
</P
><P
> A <A
HREF="http://gstreamer.freedesktop.org/data/doc/gstreamer/stable/gstreamer/html/GstElementFactory.html"
TARGET="_top"
> <CODE
CLASS="classname"
>GstElement</CODE
></A
> also provides various
<CODE
CLASS="classname"
>GObject</CODE
> signals that can be used as a flexible
callback mechanism. Here, too, you can use <B
CLASS="command"
>gst-inspect</B
>
to see which signals a specific element supports. Together, signals
and properties are the most basic way in which elements and
applications interact.
</P
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