IWMPlayerHook::PreDecode method (wmsdkidl.h)
[The feature associated with this page, Windows Media Format 11 SDK, is a legacy feature. It has been superseded by Source Reader and Sink Writer. Source Reader and Sink Writer have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use Source Reader and Sink Writer instead of Windows Media Format 11 SDK, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]
The PreDecode method is called by the reader object before a sample from the output to which the IWMPlayerHook interface is assigned is passed to the video processor for decoding.
Syntax
HRESULT PreDecode();
Return value
The method returns an HRESULT. You should return S_OK.
Remarks
To assign an implementation of the IWMPlayerHook interface to an output in the reader object, call IWMReaderAdvanced5::SetPlayerHook.
Requirements
| Minimum supported client | Windows XP [desktop apps only],Windows Media Format 9.5 SDK with update number 888656 installed, or later versions of the SDK |
| Minimum supported server | Windows Server 2003 [desktop apps only] |
| Target Platform | Windows |
| Header | wmsdkidl.h (include Wmsdk.h) |
| Library | Wmvcore.lib; WMStubDRM.lib (if you use DRM) |