IMFVideoDisplayControl::SetVideoPosition method (evr.h)

Artigo
12/05/2018

[The component described on this page, Enhanced Video Renderer, is a legacy feature. It has been superseded by the Simple Video Renderer (SVR) exposed through the MediaPlayer and IMFMediaEngine components. To play video content you should send data into one of these components and allow them to instantiate the new video renderer. These components have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer or the lower level IMFMediaEngine APIs to play video media in Windows instead of the EVR, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

Sets the source and destination rectangles for the video.

Syntax

HRESULT SetVideoPosition(
  [in] const MFVideoNormalizedRect *pnrcSource,
  [in] const LPRECT                prcDest
);

Parameters

[in] pnrcSource

Pointer to an MFVideoNormalizedRect structure that specifies the source rectangle. This parameter can be NULL. If this parameter is NULL, the source rectangle does not change.

[in] prcDest

Specifies the destination rectangle. This parameter can be NULL. If this parameter is NULL, the destination rectangle does not change.

Return value

The method returns an HRESULT. Possible values include, but are not limited to, those in the following table.

Return code	Description
S_OK	The method succeeded.
E_POINTER	At least one parameter must be non-NULL.
MF_E_SHUTDOWN	The video renderer has been shut down.

Remarks

The source rectangle defines which portion of the video is displayed. It is specified in normalized coordinates. For more information, see MFVideoNormalizedRect structure. To display the entire video image, set the source rectangle to {0, 0, 1, 1}. The default source rectangle is {0, 0, 1, 1}.

The destination rectangle defines a rectangle within the clipping window where the video appears. It is specified in pixels, relative to the client area of the window. To fill the entire window, set the destination rectangle to {0, 0, width, height}, where width and height are dimensions of the window client area. The default destination rectangle is {0, 0, 0, 0}.

To update just one of these rectangles, set the other parameter to NULL. You can set pnrcSource or prcDest to NULL, but not both.

Before setting the destination rectangle (prcDest), you must set the video window by calling IMFVideoDisplayControl::SetVideoWindow. (For the Media Foundation version of the EVR, you can also provide the video window in the MFCreateVideoRendererActivate function.) If no video window was provided, SetVideoPosition returns E_POINTER.

Requirements

Requirement	Value
Minimum supported client	Windows Vista [desktop apps only]
Minimum supported server	Windows Server 2008 [desktop apps only]
Target Platform	Windows
Header	evr.h
Library	Strmiids.lib

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