IAMVideoAcceleratorNotify::GetUncompSurfacesInfo method (videoacc.h)

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4/26/2023

[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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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
E_FAIL	Failure.
E_INVALIDARG	Argument is invalid.
E_NOTIMPL	Method is not supported.
E_POINTER	NULL pointer argument.
S_OK	Success.

Remarks

After the video renderer allocates the uncompressed surfaces, it calls the decoder's IAMVideoAcceleratorNotify::SetUncompSurfacesInfo method.

Requirements

Requirement	Value
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

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