* Creates the element with all of the required parameters set to use
* this device.
*
- * Returns: (transfer full): a new #GstElement configured to use this device
+ * Returns: (transfer full) (nullable): a new #GstElement configured to use
+ * this device
*
* Since: 1.4
*/
*
* Getter for the #GstCaps that this device supports.
*
- * Returns: The #GstCaps supported by this device. Unref with
+ * Returns: (nullable): The #GstCaps supported by this device. Unref with
* gst_caps_unref() when done.
*
* Since: 1.4
*
* Gets the extra properties of a device.
*
- * Returns: The extra properties or %NULL when there are none.
+ * Returns: (nullable): The extra properties or %NULL when there are none.
* Free with gst_structure_free() after use.
*
* Since: 1.6