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Retrieves the allocator interface that this input pin identifies as the interface for the output pin to use.
HRESULT GetAllocator( IMemAllocator ** ppAllocator );
Parameters
- ppAllocator
- Pointer to an obtained
IMemAllocatorobject.
Return Values
Default implementation returns either E_OUTOFMEMORY, if an allocator cannot be created, or NOERROR upon success.
Remarks
This member function implements the IMemInputPin::GetAllocatormethod, which is called by the connected output pin to retrieve an allocator to use for transporting media samples. By default, this member function creates a CMemAllocatorobject and obtains the IMemAllocatorinterface, to which it adds a reference count for the pin when assigning it to the m_pAllocatordata member, and adds another reference count before passing it back to the output pin.
Override this member function if your filter has another allocator, such as one from a downstream pin, or a specialized allocator to offer the connected output pin.