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Provides a media type enumerator from the upstream filter.
HRESULT EnumMediaTypes( IEnumMediaTypes ** ppEnum );
Parameters
- ppEnum
- Pointer to an enumerator for the media types.
Return Values
Returns NOERROR if successful, VFW_E_NOT_CONNECTEDif there is no connection, or an HRESULTthat indicates an error with the enumerator, such as E_POINTER or E_OUTOFMEMORY.
Remarks
This member function overrides the CBasePin::EnumMediaTypesmember function and implements the IPin::EnumMediaTypesmethod. Transform-inplace filters use the media type enumerator from adjacent filters because they do not change the media type. This member function calls IPin::EnumMediaTypeson the output pin connected to the filter's input pin. If an application receives an enumerator, the application must release it when finished.