Skip redundant nearest/near/zero encodes in splitmv.

Encode of first 50 frames of bus @ 1500kbps (speed 0) goes from
1min7.3 to 1min6.2, i.e. 1.7% faster overall.

Change-Id: I19d2deacfbffadd61d32551cee9586757ab4a987

diff --git a/vp9/encoder/vp9_rdopt.c b/vp9/encoder/vp9_rdopt.c
index 5631781a4c52c7b432fa1d071fe6f3e07dd90f50..4fe207b58b471db69a454090e3b4e10f0326ca80 100644 (file)
--- a/vp9/encoder/vp9_rdopt.c
+++ b/vp9/encoder/vp9_rdopt.c
@@ -1861,6 +1861,30 @@ static void rd_check_segment_txsize(VP9_COMP *cpi, MACROBLOCK *x,
         const struct buf_2d orig_src = x->plane[0].src;
         struct buf_2d orig_pre[2];
 
+        // if we're near/nearest and mv == 0,0, compare to zeromv
+        if ((this_mode == NEARMV || this_mode == NEARESTMV ||
+             this_mode == ZEROMV) &&
+            frame_mv[this_mode][mbmi->ref_frame[0]].as_int == 0 &&
+            (mbmi->ref_frame[1] <= 0 ||
+             frame_mv[this_mode][mbmi->ref_frame[1]].as_int == 0)) {
+          int rfc = mbmi->mb_mode_context[mbmi->ref_frame[0]];
+          int c1 = cost_mv_ref(cpi, NEARMV, rfc);
+          int c2 = cost_mv_ref(cpi, NEARESTMV, rfc);
+          int c3 = cost_mv_ref(cpi, ZEROMV, rfc);
+
+          if (this_mode == NEARMV) {
+            if (c1 >= c2 || c1 > c3)
+              continue;
+          } else if (this_mode == NEARESTMV) {
+            if (c2 > c1 || c2 > c3)
+              continue;
+          } else {
+            assert(this_mode == ZEROMV);
+            if (c3 >= c2 || c3 >= c1)
+              continue;
+          }
+        }
+
         vpx_memcpy(orig_pre, x->e_mbd.plane[0].pre, sizeof(orig_pre));
 
         vpx_memcpy(t_above_s, t_above, sizeof(t_above_s));