IDMOVideoOutputOptimizations::QueryOperationModePreferences
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
Header: Declared in Mediaobj.h; include Dmo.h
Library: Dmoguids.lib.
See Also