|Microsoft DirectX 9.0|
The GetAllocatorRequirements method retrieves the allocator properties requested by the input pin.
HRESULT GetAllocatorRequirements( ALLOCATOR_PROPERTIES *pProps );
Pointer to an ALLOCATOR_PROPERTIES structure, which is filled in with the requirements.
When an output pin initializes a memory allocator, it can call this method to determine whether the input pin has any buffer requirements. For more information, see CBaseOutputPin::DecideAllocator.
Implementing this method is optional. If the filter has specific alignment or prefix requirements, override this method.