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4/8/2010

Retrieves the allocator interface that this input pin identifies as the interface for the output pin to use.

Syntax 

HRESULT GetAllocator(
  IMemAllocator** 
ppAllocator
);

Parameters

ppAllocator

Pointer to an obtained IMemAllocatorobject.

Return Value

Default implementation returns either E_OUTOFMEMORY, if an allocator cannot be created, or NOERROR upon success.

Remarks

This member function implements the IMemInputPin::GetAllocatormethod, which is called by the connected output pin to retrieve an allocator to use for transporting media samples.

By default, this member function creates a CMemAllocatorobject and obtains the IMemAllocatorinterface, to which it adds a reference count for the pin when assigning it to the m_pAllocatordata member, and adds another reference count before passing it back to the output pin.

Override this member function if your filter has another allocator, such as one from a downstream pin, or a specialized allocator to offer the connected output pin.

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