gboolean gst_v4l2_object_open (GstV4l2Object * v4l2object, GstV4l2Error * error);
gboolean gst_v4l2_object_open_shared (GstV4l2Object * v4l2object, GstV4l2Object * other);
gboolean gst_v4l2_object_close (GstV4l2Object * v4l2object);
-gboolean gst_v4l2_object_clear_format_list (GstV4l2Object * v4l2object);
/* probing */