IMemInputPin::GetAllocatorRequirements method (strmif.h)

Article
07/27/2023

[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

The GetAllocatorRequirements method retrieves the allocator properties requested by the input pin.

Syntax

HRESULT GetAllocatorRequirements(
  [out] ALLOCATOR_PROPERTIES *pProps
);

Parameters

[out] pProps

Pointer to an ALLOCATOR_PROPERTIES, structure which is filled in with the requirements.

Return value

Returns an HRESULT value. Possible values include those shown in the following table.

Return code	Description
S_OK	Success
E_NOTIMPL	Not implemented
E_POINTER	NULL pointer argument

Remarks

When an output pin initializes a memory allocator, it can call this method to determine whether the input pin has any buffer requirements. The input pin is not required to implement this method. If the filter has specific alignment or prefix requirements, it should implement this method.

Requirements

Requirement	Value
Minimum supported client	Windows 2000 Professional [desktop apps only]
Minimum supported server	Windows 2000 Server [desktop apps only]
Target Platform	Windows
Header	strmif.h (include Dshow.h)
Library	Strmiids.lib