This filter doesn't seem to do that much on its own. I wouldn't be surprised if it's mainly a raw stream feeder to the GPU driver of some sort. I haven't dealt at all with DirectShow ever though so I wouldn't know how to look but I would not be surprised if an experienced DirectShow coder could replicate this filter fully and then some within days at most.
PS. A huge advantage of this method is that the CPU is left almost entirely unused, unlike SVP which needs an extreme CPU contribution, even on GPU mode.
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