IAMVideoAcceleratorNotify::GetUncompSurfacesInfo method (videoacc.h)
[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]
The GetUncompSurfacesInfo method queries the decoder for the number of uncompressed surfaces to allocate and the pixel format.
Syntax
HRESULT GetUncompSurfacesInfo(
[in] const GUID *pGuid,
[in, out] LPAMVAUncompBufferInfo pUncompBufferInfo
);
Parameters
[in] pGuid
Pointer to a GUID that specifies the DXVA profile in use.
[in, out] pUncompBufferInfo
Pointer to a AMVAUncompBufferInfo structure. The decoder fills in this structure with the decoder's requirements for the minimum and maximum number of surfaces and the pixel format.
To get the list of supported pixel formats, the decoder should call IAMVideoAccelerator::GetUncompFormatsSupported.
Return value
Returns an HRESULT value that depends on the implementation of the interface. HRESULT can include one of the following standard constants, or other values not listed.
| Return code | Description |
|---|---|
|
Failure. |
|
Argument is invalid. |
|
Method is not supported. |
|
NULL pointer argument. |
|
Success. |
Remarks
After the video renderer allocates the uncompressed surfaces, it calls the decoder's IAMVideoAcceleratorNotify::SetUncompSurfacesInfo method.
Requirements
| Minimum supported client | Windows 2000 Professional [desktop apps only] |
| Minimum supported server | Windows 2000 Server [desktop apps only] |
| Target Platform | Windows |
| Header | videoacc.h |
| Library | Strmiids.lib |