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CBaseInputPin::GetAllocator

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

HRESULT GetAllocator(
  IMemAllocator** ppAllocator
);

Parameters

Return Values

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

Remarks

This member function implements the IMemInputPin::GetAllocator method, 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 CMemAllocator object and obtains the IMemAllocator interface, to which it adds a reference count for the pin when assigning it to the m_pAllocator data 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

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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