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VP_DEVICE_DESCRIPTION structure

The VP_DEVICE_DESCRIPTION structure describes the attributes of the physical device for which a driver is requesting a DMA object.

Syntax


typedef struct _VP_DEVICE_DESCRIPTION {
  BOOLEAN ScatterGather;
  BOOLEAN Dma32BitAddresses;
  BOOLEAN Dma64BitAddresses;
  ULONG   MaximumLength;
} VP_DEVICE_DESCRIPTION, *PVP_DEVICE_DESCRIPTION;

Members

ScatterGather

If TRUE, indicates that the device supports scatter/gather DMA. If FALSE, the device does not support scatter/gather DMA.

Dma32BitAddresses

If TRUE, specifies that 32-bit addresses are being used for DMA operations.

Dma64BitAddresses

If TRUE, specifies that 64-bit addresses are being used for DMA operations.

MaximumLength

Specifies the maximum number of bytes the device can handle in each DMA operation.

Remarks

This structure is available in Windows XP and later.

Requirements

Header

Video.h (include Video.h)

 

 

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