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Negotiates an allocator to use with the asynchronous reader.
virtual HRESULT DecideAllocator( ImemAllocator * pAlloc, ALLOCATOR_PROPERTIES * pProps );
Parameters
- pAlloc
- Allocator to propose as the preferred allocator (optional). Pass NULL if you aren't proposing an allocator.
- pProps
- Size, count, and alignment of the allocator (optional). Pass
zero if not requesting the allocator properties.
Return Values
Returns S_OK if successful, VFW_E_BADALIGN if ePropscontains an invalid alignment property, E_OUTOFMEMORY if there is not enough memory available to create an allocator, and E_NOINTERFACE if the created IMemAllocatorinterface is invalid.
Remarks
This member function calls the IAsyncReader::RequestAllocatormethod to negotiate an allocator.