IOCTL_VIDEO_UNMAP_VIDEO_MEMORY IOCTL (ntddvdeo.h)
Releases a mapping between the virtual address space and the adapter's frame buffer and video RAM. Miniport drivers are required to support this nonmodal request.
Major code
Input buffer
The VRP InputBuffer contains a VIDEO_MEMORY structure, specifying the previously mapped virtual base address to be released with VideoPortUnmapMemory.
Output buffer
None
Status block
The miniport driver does not set the Information member of the STATUS_BLOCK structure.
Requirements
| Requirement | Value |
|---|---|
| Header | ntddvdeo.h |