IAMVideoAccelerator::ReleaseBuffer method (videoacc.h)

Artigo
4/26/2023

[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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 ReleaseBuffer method releases a buffer that was locked by a previous call to IAMVideoAccelerator::GetBuffer.

Syntax

HRESULT ReleaseBuffer(
  [in] DWORD dwTypeIndex,
  [in] DWORD dwBufferIndex
);

Parameters

[in] dwTypeIndex

The surface type of the buffer. Use the same value that was passed to the dwTypeIndex parameter of the GetBuffer method.

[in] dwBufferIndex

The zero-based index of the buffer. Use the same value that was passed to the dwBufferIndex parameter of the GetBuffer method.

Return value

Returns an HRESULT value that depends on the implementation of the interface. HRESULT can include one of the following standard constants, or other values not listed.

Return code	Description
E_FAIL	Failure.
E_INVALIDARG	Argument is invalid.
E_NOTIMPL	Method is not supported.
E_POINTER	NULL pointer argument.
S_OK	Success.
VFW_E_INVALIDSUBTYPE	The decoder did not use a DXVA decoding type when it connected to the video renderer.
VFW_E_NOT_CONNECTED	The pins on the decoder and video renderer filters are not connected.

Remarks

If the filter's pins are not connected, the method returns VFW_E_NOT_CONNECTED.

This method unlocks a single buffer. The video decoder calls this method when the buffer is no longer required, after any calls to IAMVideoAccelerator::Execute have been made using that buffer.

The buffer pointer obtained from GetBuffer is no longer valid after this call.

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	videoacc.h
Library	Strmiids.lib

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