CTransformFilter::DecideBufferSize

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Windows Embedded CE 6.0 R3

4/8/2010

Sets the number and size of buffers required for the transfer.

Syntax

virtual HRESULT DecideBufferSize(
  IMemAllocator* pAlloc,
  ALLOCATOR_PROPERTIES* ppropInputRequest
) PURE; 

Parameters

• pAlloc
  Allocator assigned to the transfer.

• ppropInputRequest
  Requested allocator properties for count, size, and alignment, as specified by the ALLOCATOR_PROPERTIES structure.

Return Value

Returns an HRESULT value.

Remarks

This member function is called by the CTransformOutputPin::DecideBufferSize member function.

Override and implement this member function to call the CMemAllocator::SetProperties member function with appropriate values for the output stream.

This call might fail if the allocator cannot satisfy the request.

Requirements