---+
            |    |    |    |    |smhd|    |    |    | Sound Media Header Box       |
            +----+----+----+----+----+----+----+----+------------------------------+
            |    |    |    |    |dinf|    |    |    | Data Information Box         |
            +----+----+----+----+----+----+----+----+------------------------------+
            |    |    |    |    |    |dref|    |    | Data Reference Box           |
            +----+----+----+----+----+----+----+----+-----------------------------