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VideoPortGetDmaAdapter function

The VideoPortGetDmaAdapter function returns a pointer to a VP_DMA_ADAPTER structure, which is used in subsequent calls to other DMA-related functions.

Syntax


PVP_DMA_ADAPTER VideoPortGetDmaAdapter(
  _In_  PVOID HwDeviceExtension,
  _In_  PVP_DEVICE_DESCRIPTION VpDeviceDescription
);

Parameters

HwDeviceExtension [in]

Pointer to the miniport driver's device extension.

VpDeviceDescription [in]

Pointer to a VP_DEVICE_DESCRIPTION structure, which describes the attributes of the physical device.

Return value

VideoPortGetDmaAdapter returns a pointer to a VP_DMA_ADAPTER structure on success; if it is unsuccessful in obtaining information about the DMA adapter, it returns NULL.

Requirements

Version

Available in Windows XP and later versions of the Windows operating systems.

Header

Video.h (include Video.h)

Library

Videoprt.lib

DLL

Videoprt.sys

IRQL

PASSIVE_LEVEL

See also

VideoPortStartDma
VideoPortPutDmaAdapter
VideoPortCompleteDma
VP_DEVICE_DESCRIPTION

 

 

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