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CBaseOutputPin::DecideBufferSize

  • Article
 
Microsoft DirectShow 9.0

CBaseOutputPin::DecideBufferSize

The DecideBufferSize method sets the buffer requirements.

Syntax

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

Parameters

pAlloc

Pointer to the allocator's IMemAllocator interface.

ppropInputRequest

Pointer to an ALLOCATOR_PROPERTIES structure that contains the input pin's buffer requirements. If the input pin does not have any requirements, the caller should zero out the members of this structure before calling the method.

Return Value

Returns S_OK if successful, or an HRESULT value indicating the cause of the error.

Remarks

Override this method in your derived class. Call the IMemAllocator::SetProperties method to specify your buffer requirements. Typically, the derived class will honor the input pin's buffer requirements, but it is not required to.

Requirements

**  Header:** Declared in Amfilter.h; include Streams.h.

**  Library:** Use Strmbase.lib (retail builds) or Strmbasd.lib (debug builds).

See Also