gst/gstpreset.c: Add some comments and TODOs.

Original commit message from CVS:
* gst/gstpreset.c:
Add some comments and TODOs.
* gst/gstpreset.h:
Add padding for future changes.
* plugins/elements/gstqueue.c:
Implement the iface.

ChangeLog

@@ -1,3 +1,14 @@
+2007-11-17  Stefan Kost  <ensonic@users.sf.net>
+
+	* gst/gstpreset.c:
+	  Add some comments and TODOs.
+
+	* gst/gstpreset.h:
+	  Add padding for future changes.
+
+	* plugins/elements/gstqueue.c:
+	  Implement the iface.	  
+
 2007-11-17  Stefan Kost  <ensonic@users.sf.net>
 
 	* docs/gst/gstreamer-docs.sgml:

gst/gstpreset.c

@@ -36,6 +36,7 @@
  * - how can we support both Preferences and Presets, a flag for _get_preset_names ?
  * - should there be a 'preset-list' property to get the preset list
  *   (and to connect a notify:: to to listen for changes)
+ * - do we want to ship presets for some elements?
  *
  * http://www.buzztard.org/index.php/Preset_handling_interface
  */

gst/gstpreset.h

@@ -61,6 +61,9 @@ struct _GstPresetInterface
    * instances of a type and if the list changes, we trigger the signal for all
    * instance
    */
+
+  /*< private >*/
+  gpointer _gst_reserved[GST_PADDING];
 };
 
 GType gst_preset_get_type(void);

plugins/elements/gstqueue.c

@@ -174,7 +174,15 @@ enum
 #define _do_init(bla) \
     GST_DEBUG_CATEGORY_INIT (queue_debug, "queue", 0, "queue element"); \
     GST_DEBUG_CATEGORY_INIT (queue_dataflow, "queue_dataflow", 0, \
-        "dataflow inside the queue element");
+        "dataflow inside the queue element"); \
+    { \
+      const GInterfaceInfo preset_interface_info = { \
+        NULL,               /* interface_init */ \
+        NULL,               /* interface_finalize */ \
+        NULL                /* interface_data */ \
+      }; \
+      g_type_add_interface_static(object_type, GST_TYPE_PRESET, &preset_interface_info); \
+   }
 
 GST_BOILERPLATE_FULL (GstQueue, gst_queue, GstElement,
     GST_TYPE_ELEMENT, _do_init);