WMA: 包括 Header Object， Data Object， Other top-level objects 文件头对象: File ProPerties Object Stream Properties Object 1
Stream Properties Object N ---------------------------------------------------------------------------------------------------------------------- 以为列一些比较重要的 Header Object 0
File Properties Object (mandatory , one only ) Field name Field type Size (bits) Object ID GUID 128 Object Size QWORD 64 Number of Header Objects DWORD 32 Reserved1 BYTE 8 Reserved2 BYTE 8 总共30 个字节， 头16 字节固为 "30 26 B2 75 8E 66 CF 11 A6 D9 00 AA 00 62 CE 6C"，Reserv ed1 和Reserv ed2 为保留字， 解码时不考虑， 编码固定设置为 0x 01, 0x 02
File Properties Obect (mandatory , one only ) Field name Field type Size (bits) Object ID GUID 128 Object Size QWORD 64 File ID GUID 128 File Size QWORD 64 Creation Date QWORD 64 Dat
