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VIDEO_MEMORY_INFORMATION structure (ntddvdeo.h)

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The VIDEO_MEMORY_INFORMATION structure contains information about a mapping of video memory into system space or the private virtual address space of a user-mode process. The mapping is created when an IOCTL_VIDEO_MAP_VIDEO_MEMORY request is sent to the video miniport driver.

Syntax

typedef struct _VIDEO_MEMORY_INFORMATION {
  PVOID VideoRamBase;
  ULONG VideoRamLength;
  PVOID FrameBufferBase;
  ULONG FrameBufferLength;
} VIDEO_MEMORY_INFORMATION, *PVIDEO_MEMORY_INFORMATION;

Members

VideoRamBase

Virtual address of the video RAM in system space or in the address space of the user-mode process that initiated the request.

VideoRamLength

The size, in bytes, of the virtual address range that is mapped to video RAM. Memory accessible through a bank switch mechanism is not described by this value.

This value must be equal to the product VideoMemoryBitmapHeight * ScreenStride, where each factor in the product is a member of the VIDEO_MODE_INFORMATION structure.

FrameBufferBase

Pointer to the virtual address of the frame buffer in the caller's address space. The frame buffer is the actively displayed part of video RAM.

FrameBufferLength

Specifies the linear length of the frame buffer in the caller's virtual address space. Memory accessible through a bank switch mechanism is not described by this value.

This value must be equal to the product VisScreenWidth * ScreenStride, where each term in this product is a member of the VIDEO_MODE_INFORMATION structure.

Remarks

In the IOCTL_VIDEO_MAP_VIDEO_MEMORY request, VIDEO_MEMORY serves as an input structure, while VIDEO_MEMORY_INFORMATION serves as an output structure.

Requirements

Requirement Value
Header ntddvdeo.h (include Ntddvdeo.h)

See also

IOCTL_VIDEO_MAP_VIDEO_MEMORY

IOCTL_VIDEO_UNMAP_VIDEO_MEMORY

VIDEO_MEMORY

VIDEO_MODE_INFORMATION