Use 4-tap interp filter in speed 1 sub-pel motion search
Added the 4-tap interp filter, and used it for speed 1 sub-pel motion
search. Speed 2 motion search still used bilinear filter as before.
Speed 1 borg test showed good bit savings.
avg_psnr: ovr_psnr: ssim:
lowres: -1.125 -1.179 -1.021
midres: -0.717 -0.710 -0.543
hdres: -0.357 -0.370 -0.342
Speed test at speed 1 showed ~10% encoder time increase, which was
partially because of no SIMD version of 4-tap filter.
5 files changed