IDMOVideoOutputOptimizations::GetCurrentSampleRequirements

  • Article

This method retrieves the optimization features required to process the next sample, given the features already agreed to by the application.

HRESULT GetCurrentSampleRequirements(
  ULONG ulOutputStreamIndex,
  DWORD* pdwRequestedFeatures
);

Parameters

  • ulOutputStreamIndex
    Zero-based index of an output stream on the DMO.
  • pdwRequestedFeatures
    Pointer to a variable that receives the required features. The returned value is a bitwise combination of zero or more flags from the DMO_VIDEO_OUTPUT_STREAM_FLAGS enumeration.

Return Values

Returns an HRESULT value. Possible values include the following.

Value Description
S_OK Success
DMO_E_INVALIDSTREAMINDEX Invalid stream index
E_POINTER NULL pointer argument

Remarks

After an application calls the IDMOVideoOutputOptimizations::SetOperationMode method, it must provide all the features it has agreed to. However, the DMO might not require every feature on every sample. This method enables the DMO to waive an agreed-on feature for one sample.

Before processing a sample, the application can call this method. If the DMO does not require a given feature to process the next sample, it omits the corresponding flag from the pdwRequestedFeatures parameter. For the next sample only, the application can ignore the feature. The results of this method are valid only for the next call to the IMediaObject::ProcessOutput method.

The DMO will return only the flags that were agreed to in the SetOperationMode method. In other words, you cannot dynamically enable new features with this method.

Requirements

OS Versions: Windows CE .NET 4.1 and later.
Header: Dmo.h.
Link Library: Dmoguid.lib.

See Also

IDMOVideoOutputOptimizations | IDMOVideoOutputOptimizations::SetOperationMode | IMediaObject::ProcessOutput | DMO_VIDEO_OUTPUT_STREAM_FLAGS | DMO_E_INVALIDSTREAMINDEX

Last updated on Wednesday, April 13, 2005

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