IDirectDrawVideo interface

The IDirectDrawVideo interface queries the Video Renderer filter about DirectDraw surfaces and hardware capabilities.

Applications can use this interface to control what DirectDraw features the Video Renderer will take advantage of. For example, if you are positive that you don't want the Video Renderer to use a hardware overlay you can disable its use via the SetSwitches method.

Note  You can't use this interface to force the Video Renderer to use a particular DirectDraw feature; you can only stop it from using that feature.
 

There is some duplication in this interface with the IDirectDraw interface; however, this interface enables simple access to that information without calling the DirectDraw provider directly.

The Video Renderer does not load DirectDraw until it is connected, and likewise DirectDraw is unloaded only when the renderer is disconnected. When the renderer has allocated the DirectDraw surfaces it will use for video playback, an application can obtain a DDSURFACEDESC structure describing it. By passing in a pointer to a DDSURFACEDESC structure, the renderer will fill in the structure with the details of the current surface. If DirectDraw has not been loaded, the renderer will return E_FAIL. If the renderer is using DCI (the predecessor to DirectDraw), the DDSURFACEDESC structure is not filled in but the call will return S_FALSE. The only type of DCI surfaces the renderer uses are primary surfaces.

Members

The IDirectDrawVideo interface inherits from the IUnknown interface. IDirectDrawVideo also has these types of members:

Methods

The IDirectDrawVideo interface has these methods.

MethodDescription
CanUseOverlayStretch

Determines whether the renderer will check overlay restrictions.

CanUseScanLine

Determines whether the renderer will check the current scan line when drawing.

GetCaps

Retrieves a DirectDraw-defined DDCAPS structure containing the hardware capabilities.

GetDirectDraw

Retrieves the IDirectDraw interface.

GetEmulatedCaps

Retrieves a DirectDraw-defined DDCAPS structure containing the emulated capabilities.

GetFourCCCodes

Retrieves the multimedia format type FOURCC DWORD.

GetSurfaceDesc

Retrieves a description of the DirectDraw surface in use.

GetSurfaceType

Retrieves the actual surface type.

GetSwitches

Retrieves the surface types that the renderer is allowed to use.

SetDefault

Makes the current property settings the global default.

SetDirectDraw

Passes the IDirectDraw interface to a loaded driver.

SetSwitches

Sets the surface types that the renderer is allowed to use.

UseOverlayStretch

Determines whether the renderer should check overlay stretch limitations.

UseScanLine

Determines whether the renderer should check the current scan line when drawing a video.

UseWhenFullScreen

Determines whether DirectShow should change display mode when going to full-screen mode.

WillUseFullScreen

Determines whether DirectShow will change display mode when going to full-screen mode.

 

Requirements

Minimum supported client

Windows 2000 Professional [desktop apps only]

Minimum supported server

Windows 2000 Server [desktop apps only]

Header

Amvideo.h (include Dshow.h)

Library

Strmiids.lib

 

 

Show: