VPE Callback Functions

The following table lists the video port extensions (VPE) callback functions that are implemented in a display driver. A display driver that supports VPE must implement some VPE callback functions; some are optional depending on the hardware capabilities.

VPE Callback Function	Description
DdVideoPortCanCreate	Determines whether the driver can support a DirectDraw VPE object of the specified description.
DdVideoPortColorControl	Gets or sets the VPE object color controls.
DdVideoPortCreate	Notifies the driver that DirectDraw created a VPE object.
DdVideoPortDestroy	Notifies the driver that DirectDraw destroyed the specified VPE object.
DdVideoPortFlip	Performs a physical flip, causing the VPE object to start writing data to the new surface.
DdVideoPortGetBandwidth	Reports the bandwidth limitations of the device's frame buffer memory based on the specified VPE object output format.
DdVideoPortGetConnectInfo	Returns the connections supported by the specified VPE object.
DdVideoPortGetField	Determines whether the current field of an interlaced signal is even or odd.
DdVideoPortGetFlipStatus	Determines whether the most recently requested flip on a surface has occurred.
DdVideoPortGetInputFormats	Determines the input formats that the DirectDraw VPE object can accept.
DdVideoPortGetLine	Returns the current line number of the hardware video port.
DdVideoPortGetOutputFormats	Determines the output formats that the VPE object supports.
DdVideoPortGetSignalStatus	Retrieves the status of the video signal currently being presented to the hardware video port.
DdVideoPortUpdate	Starts and stops the VPE object and modifies the VPE object data stream.
DdVideoPortWaitForSync	Waits until the next vertical synch occurs.