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IVMRWindowlessControl::GetNativeVideoSize

  • Articolo
 
Microsoft DirectShow 9.0

IVMRWindowlessControl::GetNativeVideoSize

The GetNativeVideoSize method retrieves the un-stretched video size and aspect ratio of the video.

Syntax

  HRESULT GetNativeVideoSize(

  
  LONG*
  
  lpWidth
  ,

  
  LONG*
  
  lpHeight
  ,

  
  LONG*
  
  lpARWidth
  ,

  
  LONG*
  
  lpARHeight

  );

Parameters

lpWidth

[out]  Pointer that receives the width of the native video rectangle.

lpHeight

[out]  Pointer that receives the height of the native video rectangle.

lpARWidth

[out]  Pointer that receives the aspect ratio width of the native video rectangle.

lpARHeight

[out]  Pointer that receives the aspect ratio height of the native video rectangle.

Return Values

If the method succeeds, it returns S_OK. Returns E_POINTER if all four input parameters are NULL.

Error Code Description
VFW_E_WRONG_STATE The VMR is not in windowless mode.

Remarks

If the VMR is not connected to an upstream filter, this method will succeed but all parameters will be set to zero.

If lpWidth is 640 and lpHeight is 480, then lpARWidth will be 4 and lpARHeight will be 3.

Requirements

Header: Declared in Strmif.h; include Dshow.h.

Library: Use Strmiids.lib.

See Also