IDMOVideoOutputOptimizations::SetOperationMode

A version of this page is also available for

Windows Embedded CE 6.0 R3

4/8/2010

This method notifies the DMO of the optimizations in effect.

Syntax

HRESULT SetOperationMode(
  ULONG ulOutputStreamIndex,
  DWORD dwEnabledFeatures
);

Parameters

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

• dwEnabledFeatures
  Bitwise combination of zero or more flags from the DMO_VIDEO_OUTPUT_STREAM_FLAGS enumeration.

Return Value

Returns an HRESULT value. Possible values include the following.

Remarks

Before calling this method, call the IDMOVideoOutputOptimizations::QueryOperationModePreferences method to determine which optimizations the DMO requests. Then call this method to inform the DMO about which optimization you are providing.

If you are not providing an optimization, it is not necessary to call this method. The DMO does not assume that any optimization will be provided.

The application must provide all optimizations it has agreed to. However, for some optimizations the DMO might not require the optimization on every sample.

To determine if the DMO can dispense with optimizations on the next sample, call the IDMOVideoOutputOptimizations::GetCurrentSampleRequirements method. In effect, this enables the DMO to waive an agreed-on optimization for one sample.

Before streaming begins, subsequent calls to this method override earlier calls. To set multiple optimizations, you must do so in a single method call. Once streaming begins, this method returns an error. Streaming begins when the applications calls IMediaObject::ProcessInput on at least one input stream.

When streaming ends, the application can renegotiate the optimizations. Streaming ends if the application calls the IMediaObject::Flush method or if the application calls IMediaObject::Discontinuity on all the input streams and then processes all of the remaining output.

Requirements

See Also

Reference

IDMOVideoOutputOptimizations
DMO Error Codes
IDMOVideoOutputOptimizations::QueryOperationModePreferences
IDMOVideoOutputOptimizations::GetCurrentSampleRequirements
IMediaObject::ProcessInput
IMediaObject::Flush
IMediaObject::Discontinuity