void _mmcamcorder_element_release_noti(gpointer data, GObject *where_the_object_was);
gboolean _mmcamcorder_add_elements_to_bin(GstBin *bin, GList *element_list);
gboolean _mmcamcorder_link_elements(GList *element_list);
-gboolean _mmcamcorder_filtered_link_elements(GList *element_list, GstCaps *caps);
/* Message */
#ifdef _MMCAMCORDER_ENABLE_IDLE_MESSAGE_CALLBACK