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Steinar Midtskogen authored
This enables CDEF for chroma when the horizontal and vertical subsampling differs. Since the direction search is only performed in luma, the following corrections to the direction index are done for chroma to correct the distortion resulting from the subsampling: 4:2:2: 4:4:0: 0 -> 7 0 -> 1 1 -> 0 1 -> 2 2 -> 2 2 -> 2 3 -> 4 3 -> 2 4 -> 5 4 -> 3 5 -> 6 5 -> 4 6 -> 6 6 -> 6 7 -> 6 7 -> 0 This improves the chroma PSNR BDR by about 2% for 4:2:2 content at cpu-used=4, low delay configuration. 4:2:0 and 4:4:4 content is unchanged. Change-Id: Iee92d3697bc5a6fc9b1f340a63243a334935b433
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