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 It has been superseded by Source Reader and Sink Writer.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

See also

Enabling DirectX Video Acceleration

IWMPlayerHook Interface