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VDPAU (Video Decode and Presentation API for Unix) is an API designed by NVIDIA for its GeForce 8 series and later GPU hardware, targeted at the X Window System on Unix operating-systems (including Linux, FreeBSD, and Solaris). The VDPAU API allows video programs to offload portions of the video decoding process and video post-processing to the GPU video-hardware. Currently, the portions designed to be offloaded by VDPAU onto the GPU are motion compensation (mo comp) and inverse discrete cosine transform (iDCT), and VLD (Variable-Length Decoding) for MPEG-1, MPEG-2, MPEG-4 AVC (H.264), VC-1, and WMV3/WMV9 encoded videos.