|Microsoft DirectX 9.0|
This topic applies to Windows XP Service Pack 1 only.
In order to understand and build these objects, a programmer must be familiar with the EIA/CEA-608-B specifications, which explain the format of XDS packets.
To build the EvalRat or XDSToRat objects, an application must #include TvRatings.h.
Both objects are instantiated by, and controlled by, DirectShow filters. Both are created as standard COM objects. In addition to inheriting the standard COM interfaces, the XDSToRat object must support the IXDSToRat interface, and the EvalRat object must support the IEvalRat interface.