shithub: libvpx

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Port alt reference frame filter improvement to VP9

Use sharp filter to generate motion compensated reference for
temporal filtering. It improves the average coding performance of
VP9 speed 0:
derf    0.34%
hevcmr  0.38%
stdhd   0.58%

Change-Id: I1772a051be545de8c343055274e5ca0929d19cda

--- a/vp9/encoder/vp9_temporal_filter.c

+++ b/vp9/encoder/vp9_temporal_filter.c

@@ -45,8 +45,7 @@

                                             int x, int y) {

   const int which_mv = 0;

   const MV mv = { mv_row, mv_col };

-  const InterpKernel *const kernel =

-    vp9_filter_kernels[xd->mi[0]->interp_filter];

+  const InterpKernel *const kernel = vp9_filter_kernels[EIGHTTAP_SHARP];

   enum mv_precision mv_precision_uv;

   int uv_stride;

@@ -86,6 +85,7 @@

     return;

   }

 #endif  // CONFIG_VP9_HIGHBITDEPTH

+  (void)xd;

   vp9_build_inter_predictor(y_mb_ptr, stride,

                             &pred[0], 16,

                             &mv,