IBasicVideo Interface

The IBasicVideo interface sets video properties such as the destination and source rectangles. The Video Renderer filter and Video Mixing Renderer filters implement this interface, but the interface is exposed to applications through the Filter Graph Manager. Applications should always retrieve this interface from the Filter Graph Manager.

The IBasicVideo interface manipulates the following rectangles associated with the video image:

The source rectangle is the portion of the original image that gets displayed.
The destination rectangle is the portion of the video window the receives the source rectangle.
The video rectangle is the original video image.

In other words, the video renderer crops the image to the source rectangle, and then stretches or shrinks the cropped image to the destination rectangle. All rectangle dimensions are given in pixels.

Properties set on the Video Renderer persist between successive connections and disconnections.

Error codes: If the video renderer filter is not connected to another filter, all methods return the error code VFW_E_NOT_CONNECTED. For the Filter Graph Manager's implementation, if the graph does not contain a video renderer filter, all methods return E_NOINTERFACE. Note that the Filter Graph Manager exposes the interface even when the graph does not contain a video renderer, so an application can query for the interface before it builds the graph.

In addition to the methods inherited from IDispatch, the IBasicVideo interface exposes the following methods.

Method	Description
get_AvgTimePerFrame	Retrieves the average time between successive frames.
get_BitErrorRate	Retrieves the approximate bit error rate of the video stream.
get_BitRate	Retrieves the approximate bit rate of the video stream.
get_DestinationHeight	Retrieves the height of the destination rectangle.
get_DestinationLeft	Retrieves the x-coordinate of the destination rectangle.
get_DestinationTop	Retrieves the y-coordinate of the destination rectangle.
get_DestinationWidth	Retrieves the width of the destination rectangle.
get_SourceHeight	Retrieves the height of the source rectangle.
get_SourceLeft	Retrieves the x-coordinate of the source rectangle.
get_SourceTop	Retrieves the y-coordinate of the source rectangle.
get_SourceWidth	Retrieves the width of the source rectangle.
get_VideoHeight	Retrieves the video height.
get_VideoWidth	Retrieves the video width.
GetCurrentImage	Returns a copy of the current image that is waiting at the renderer.
GetDestinationPosition	Retrieves the destination rectangle.
GetSourcePosition	Retrieves the source rectangle.
GetVideoPaletteEntries	Retrieves the color palette entries required by the video.
GetVideoSize	Retrieves the native video dimensions.
IsUsingDefaultDestination	Queries whether the renderer is using the default destination rectangle.
IsUsingDefaultSource	Queries whether the renderer is using the default source rectangle.
put_DestinationHeight	Sets the height of the destination rectangle.
put_DestinationLeft	Sets the x-coordinate of the destination rectangle.
put_DestinationTop	Sets the y-coordinate of the destination rectangle.
put_DestinationWidth	Sets the width of the destination rectangle.
put_SourceHeight	Sets the height of the video rectangle.
put_SourceLeft	Sets the x-coordinate of the source rectangle.
put_SourceTop	Sets the y-coordinate of the source rectangle.
put_SourceWidth	Sets the width of the source rectangle.
SetDefaultDestinationPosition	Reverts to the default destination rectangle.
SetDefaultSourcePosition	Reverts to the default source rectangle.
SetDestinationPosition	Sets the destination rectangle.
SetSourcePosition	Sets the source rectangle.

Requirements

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

Library: Use Strmiids.lib.