IAMVideoAccelerator::GetVideoAcceleratorGUIDs method (videoacc.h)

Artigo
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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 GetVideoAcceleratorGUIDs method gets a list of DirectX Video Acceleration (DXVA) profiles supported by the display driver.

Syntax

HRESULT GetVideoAcceleratorGUIDs(
  [in, out] LPDWORD pdwNumGuidsSupported,
  [in, out] LPGUID  pGuidsSupported
);

Parameters

[in, out] pdwNumGuidsSupported

On input, specifies the number of elements in the pGuidsSupported array. If pGuidsSupported is NULL, the value of *pdwNumGuidsSupported must be zero.

On output, if pGuidsSupported is NULL, pdwNumGuidsSupported receives the number of restricted-mode DXVA profiles. Otherwise, pdwNumGuidsSupported receives the actual number of GUIDs copied to the pGuidsSupported array.

[in, out] pGuidsSupported

Address of an array of GUIDs, or NULL. If the value is non-NULL, the array receives a list of GUIDs that specify restricted-mode DXVA profiles. These GUIDs are defined in the header file dxva.h, and are documented in the DXVA 1.0 specification.

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	The method is not supported.
E_POINTER	NULL pointer argument.
S_OK	Success.
VFW_E_WRONG_STATE	Invalid state. The video renderer has not created the Direct3D or DirectDraw device.

Remarks

Call this method twice. On the first call, set pGuidsSupported to NULL. The pdwNumGuidsSupported parameter receives the number of DXVA profile GUIDs. Allocate an array of GUIDs with the required size and call the method again. This time, set pGuidsSupported to the address of the array. The method fills the array with the list of DXVA profile GUIDs.

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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