Kernel-Mode Video Transport Callback Functions

The following table lists the kernel-mode video transport callback functions that are implemented in a video miniport driver.

DxApi Callback Function	Description
DxBobNextField	Bobs the next field of interleaved data.
DxEnableIRQ	Indicates to the miniport driver which IRQs should be enabled or disabled.
DxFlipOverlay	Flips the overlay.
DxFlipVideoPort	Flips the video port extensions (VPE) object.
DxGetCurrentAutoflip	Determines which surface is receiving the current field of video data for capture purposes.
DxGetIRQInfo	Indicates that the driver manages the interrupt request.
DxGetPolarity	Returns the polarity (even or odd) of the current field being written by the VPE object.
DxGetPreviousAutoflip	Determines which surface received the previous field of video data for capture purposes.
DxGetTransferStatus	Determines which hardware bus master completed.
DxLock	Locks the frame buffer so that it can be accessed.
DxSetState	Switches from bob mode to weave mode, and vice versa.
DxSkipNextField	Skips or reenables the next field.
DxTransfer	Bus masters data from a surface to the buffer specified in the memory descriptor list (MDL).