shithub: libvpx

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Use sub-pixel accuracy prediction non-RD mode

This commit builds the actual prediction block in sub-pixel accuracy
and uses which to calculate SAD for non-RD mode decision. In the trail
run on pedestrian_area at 1080p, rtc speed -7 runtime goes from
23495 ms -> 25107 ms (7% slower). The compression performance is
improved by 20.57% for rtc test set.

Change-Id: I438589cd103fe99f1b50c2d1939ac6ca43fa0157

--- a/vp9/encoder/vp9_pickmode.c

+++ b/vp9/encoder/vp9_pickmode.c

@@ -183,6 +183,8 @@

                             BLOCK_SIZE bsize) {

   MACROBLOCKD *xd = &x->e_mbd;

   MB_MODE_INFO *mbmi = &xd->mi_8x8[0]->mbmi;

+  struct macroblock_plane *const p = &x->plane[0];

+  struct macroblockd_plane *const pd = &xd->plane[0];

   const BLOCK_SIZE block_size = get_plane_block_size(bsize, &xd->plane[0]);

   MB_PREDICTION_MODE this_mode, best_mode = ZEROMV;

   MV_REFERENCE_FRAME ref_frame, best_ref_frame = LAST_FRAME;

@@ -255,7 +257,14 @@

           continue;

       }

-      dist = x->mode_sad[ref_frame][INTER_OFFSET(this_mode)];

+      mbmi->mode = this_mode;

+      mbmi->mv[0].as_int = frame_mv[this_mode][ref_frame].as_int;

+

+      vp9_build_inter_predictors_sby(xd, mi_row, mi_col, bsize);

+

+      dist = cpi->fn_ptr[bsize].sdf(p->src.buf, p->src.stride,

+                                    pd->dst.buf, pd->dst.stride, INT_MAX);

+

       this_rd = rate + dist;

       if (this_rd < best_rd) {

@@ -274,8 +283,6 @@

   // Perform intra prediction search, if the best SAD is above a certain

   // threshold.

   if (best_rd > inter_mode_thresh) {

-    struct macroblock_plane *const p = &x->plane[0];

-    struct macroblockd_plane *const pd = &xd->plane[0];

     for (this_mode = DC_PRED; this_mode <= DC_PRED; ++this_mode) {

       vp9_predict_intra_block(xd, 0, b_width_log2(bsize),

                               mbmi->tx_size, this_mode,