// video.h

VIDEOPORT_DEPRECATED VIDEOPORT_API PVOID VideoPortGetDmaContext(
  [in] IN PVOID HwDeviceExtension,
  [in] IN PDMA  pDma
);
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Windows Driver Kit DDI reference (nf-video-videoportgetdmacontext)

VideoPortGetDmaContext function

Description

The VideoPortGetDmaContext function is obsolete in Windows 2000 and later.

VideoPortGetDmaContext gets the context previously associated with the specified DMA handle.

Parameters

`HwDeviceExtension` [in]

Pointer to the miniport driver's device extension.

`pDma` [in]

Pointer to a DMA handle. To obtain the appropriate DMA handle, use the value in the OutputBuffer member of the pVrp parameter after VideoPortLockPages returns.

Return value

VideoPortGetDmaContext always returns NULL.

Remarks

See Bus-Master DMA in Video Miniport Drivers for information about packet-based and common-buffer DMA transfers.

View the official Windows Driver Kit DDI reference