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Retrieves the actual allocator to be used.
HRESULT RequestAllocator( IMemAllocator* pPreferred , ALLOCATOR_PROPERTIES* pProps , IMemAllocator ** ppActual );
Parameters
- pPreferred
- [in] Preferred allocator.
- pProps
- [in] Preferred allocator properties (size, count, and alignment).
- ppActual
- [out] Actual allocator used.
Return Values
Returns an HRESULTvalue that depends on the implementation of the interface. Current DirectShow implementation return values include:
Value Description E_FAIL Failure to initialize an allocator. VFW_E_BADALIGN An invalid alignment was specified. S_OK Allocator was returned. Remarks
The preferred allocator and preferred allocator properties must be passed in. This method returns the actual allocator to be used.
IMemAllocator::GetPropertiesshould be called on the returned allocator to learn the alignment and prefix chosen. This allocator will not be committed and decommitted by the asynchronous reader, only by the consumer. This method must be called before calling IAsyncReader::Request.