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Negotiates the allocator to use.
virtual HRESULT DecideAllocator( IMemInputPin * pPin , IMemAllocator ** pAlloc );
Parameters
- pPin
- Pointer to the IPininterface of the connecting pin.
- pAlloc
- Pointer to the negotiated
IMemAllocatorinterface.
Return Values
Returns NOERROR if successful; otherwise, returns an HRESULTvalue.
Remarks
This member function calls the CBaseOutputPin::DecideBufferSizemember function, which is not implemented by this base class. Override DecideBufferSizeto call IMemAllocator::SetProperties.
If the connected input pin fails a call to IMemInputPin::GetAllocator, this member function constructs a CMemAllocatorobject and calls CBaseOutputPin::DecideBufferSizeon that object. If the call to DecideBufferSizeis successful, this member function notifies the input pin of the selected allocator. This function is called by the base class implementation of the IPin::Connectmethod, which is responsible for locking the object's critical section.
Override this member function if you want to use your own allocator. The input pin gets the first choice for the allocator, and the output pin agrees or forces it to use another allocator.