IDMOVideoOutputOptimizations::QueryOperationModePreferences method (mediaobj.h)

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[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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 QueryOperationModePreferences method retrieves the DMO's preferred optimization features.

Syntax

HRESULT QueryOperationModePreferences(
  ULONG ulOutputStreamIndex,
  DWORD *pdwRequestedCapabilities
);

Parameters

ulOutputStreamIndex

Zero-based index of an output stream on the DMO.

pdwRequestedCapabilities

Pointer to a variable that receives the DMO's requested features. The returned value is a bitwise combination of zero or more flags from the DMO_VIDEO_OUTPUT_STREAM_FLAGS enumeration.

Return value

Returns an HRESULT value. Possible values include those in the following table.

Return code Description
DMO_E_INVALIDSTREAMINDEX
 Invalid stream index
E_POINTER
 NULL pointer argument
S_OK
 Success

Requirements

Requirement Value
Target Platform Windows
Header mediaobj.h (include Dmo.h)
Library Dmoguids.lib

See also

IDMOVideoOutputOptimizations Interface