IAMVideoAccelerator::Execute method (videoacc.h)

Article
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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 Execute method performs a DirectX Video Acceleration (DXVA) decoding operation.

Syntax

HRESULT Execute(
  [in] DWORD                dwFunction,
  [in] LPVOID               lpPrivateInputData,
  [in] DWORD                cbPrivateInputData,
  [in] LPVOID               lpPrivateOutputDat,
  [in] DWORD                cbPrivateOutputData,
  [in] DWORD                dwNumBuffers,
  [in] const AMVABUFFERINFO *pamvaBufferInfo
);

Parameters

[in] dwFunction

Contains one or more DXVA function numbers.

[in] lpPrivateInputData

Pointer to input data for the decoding operation. The meaning of this data depends on the surface type and function number. For details, refer to the DXVA 1.0 specification.

[in] cbPrivateInputData

Size of the input data, in bytes.

[in] lpPrivateOutputDat

Pointer to a buffer where the video accelerator will write output data.

[in] cbPrivateOutputData

Size of the lpPrivateOutputData buffer, in bytes.

[in] dwNumBuffers

Number of elements in the pamvaBufferInfo array.

[in] pamvaBufferInfo

Pointer to an array of AMVABUFFERINFO structures.

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.
VFW_E_INVALIDSUBTYPE	The decoder did not use a DXVA decoding type when it connected to the video renderer.
VFW_E_NOT_CONNECTED	The pins on the decoder and video renderer filters are not connected.

Remarks

If the filter's pins are not connected, the method returns VFW_E_NOT_CONNECTED.

The associated buffer list is passed along with a function number (defaulting to zero) and any necessary private data describing the decompression operation. For example, decompressed reference frame information is passed in the buffer list. The buffer list order is important and is defined by the particular decompression operation being performed.

Private data can be passed to and from a driver.

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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