Important:
This is retired content. This content is outdated and is no longer being maintained. It is provided as a courtesy for individuals who are still using these technologies. This content may contain URLs that were valid when originally published, but now link to sites or pages that no longer exist.
A version of this page is also available for
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_PROPERTIESstructure.

Return Value

Returns an HRESULTvalue.

Remarks

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

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

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

Requirements

Windows Embedded CE Windows CE 2.12 and later
Windows Mobile Windows Mobile Version 5.0 and later
Note Microsoft DirectShow applications and DirectShow filters have different include file and Library requirements
For more information, see Setting Up the Build Environment,
Version 2.12 requires DXPAK 1.0 or later