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Jingning Han authored
rebased. This patch includes 16x16 butterfly inverse ADST/DCT hybrid transform. It uses the variant ADST of kernel sin((2k+1)*(2n+1)/4N), which allows a butterfly implementation. The coding gains as compared to DCT 16x16 are about 0.1% for both derf and std-hd. It is noteworthy that for std-hd sets many sequences gains about 0.5%, some 0.2%. There are also few points that provides -1% to -3% performance. Hence the average goes to about 0.1%. Change-Id: Ie80ac84cf403390f6e5d282caa58723739e5ec17
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