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CBaseAllocator.Decommit method

[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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 Decommit method decommits the allocator. This method implements the IMemAllocator::Decommit method.

Syntax

HRESULT Decommit();

Parameters

This method has no parameters.

Return value

Returns S_OK.

Remarks

After this method is called, calls to the CBaseAllocator::GetBuffer method will fail. As samples are released, they get returned to the free list. When the last sample is returned, the allocator calls the CBaseAllocator::Free method, which releases the allocated memory. (In the base class, Free is a pure virtual method.)

In addition, this method releases any threads that are blocked on GetBuffer calls. The calls to GetBuffer fail.

Requirements

Requirement Value
Header
Amfilter.h (include Streams.h)
Library
Strmbase.lib (retail builds);
Strmbasd.lib (debug builds)

See also

CBaseAllocator Class