gboolean _mmcamcorder_filtered_link_elements(GList *element_list, GstCaps *caps);
/* Message */
+#ifdef _MMCAMCORDER_ENABLE_IDLE_MESSAGE_CALLBACK
gboolean _mmcamcorder_msg_callback(void *data);
+#endif /* _MMCAMCORDER_ENABLE_IDLE_MESSAGE_CALLBACK */
gboolean _mmcamcorder_send_message(MMHandleType handle, _MMCamcorderMsgItem *data);
void _mmcamcorder_remove_message_all(MMHandleType handle);