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CTransformFilter::DecideBufferSize

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

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 Values

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

DirectShow applications and DirectShow filters have different include file and link library requirements. See Setting Up the Build Environment for more information.

OS Versions: Windows CE 2.12 and later. Version 2.12 requires DXPAK 1.0 or later.
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Last updated on Wednesday, April 13, 2005

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