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>16.3. Custom bins</A
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>
The application programmer can create custom bins packed with elements
to perform a specific task. This allows you to write an MPEG audio
decoder with just the following lines of code:
</P
><PRE
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>
/* create the mp3player element */
GstElement *mp3player = gst_element_factory_make ("mp3player", "mp3player");
/* set the source mp3 audio file */
g_object_set (G_OBJECT (mp3player), "location", "helloworld.mp3", NULL);
/* start playback */
gst_element_set_state (GST_ELEMENT (mp3player), GST_STATE_PLAYING);
...
/* pause playback */
gst_element_set_state (GST_ELEMENT (mp3player), GST_STATE_PAUSED);
...
/* stop */
gst_element_set_state (GST_ELEMENT (mp3player), GST_STATE_NULL);
</PRE
><P
> Note that the above code assumes that the mp3player bin derives itself
from a <CODE
CLASS="classname"
>GstThread</CODE
>, which begins to play as soon
as its state is set to PLAYING. Other bin types may need explicit
iteration. For more information, see <A
HREF="chapter-threads.html"
>Chapter 21</A
>.
</P
><P
> Custom bins can be created with a plugin or an XML description. You
will find more information about creating custom bin in the Plugin
Writers Guide (FIXME ref).
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