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DirectX Video Acceleration (DXVA) is an API and a corresponding device driver interface (DDI) for using hardware acceleration to speed up video processing. Software codecs and software video processors can use DXVA to offload certain CPU-intensive operations to the GPU. For example, a software decoder can offload the inverse discrete cosine transform (iDCT) to the GPU.

source: http://msdn.microsoft.com/en-us/library/windows/desktop/cc307941%28v=vs.85%29.aspx