Bias against non-zero mv for large blocks.

Change is only for real-time mode, speed > 5, and non-screen content mode.
Bias is based on block size and motion vector level (motion above some threshold).

Helps to improves stability in background from lightning changes.
PSNR/SSIM metrics on RTC set almost no change/neutral (within +/- 0.1).

Change-Id: I7eac13c1ae10be4ab1f40acc7f9f1df5653ece9d

diff --git a/vp9/encoder/vp9_pickmode.c b/vp9/encoder/vp9_pickmode.c
index 867b435bd605b0ade75892b7f694221f57886dbe..e810ef5d7ec5d5baf86b78bf04033c42c24655de 100644 (file)
--- a/vp9/encoder/vp9_pickmode.c
+++ b/vp9/encoder/vp9_pickmode.c
@@ -1477,6 +1477,20 @@ void vp9_pick_inter_mode(VP9_COMP *cpi, MACROBLOCK *x,
     this_rdc.rate += ref_frame_cost[ref_frame];
     this_rdc.rdcost = RDCOST(x->rdmult, x->rddiv, this_rdc.rate, this_rdc.dist);
 
+    // Bias against non-zero (above some threshold) motion for large blocks.
+    // This is temporary fix to avoid selection of large mv for big blocks.
+    if (cpi->oxcf.speed > 5 &&
+        cpi->oxcf.content != VP9E_CONTENT_SCREEN &&
+        (frame_mv[this_mode][ref_frame].as_mv.row > 64 ||
+        frame_mv[this_mode][ref_frame].as_mv.row < -64 ||
+        frame_mv[this_mode][ref_frame].as_mv.col > 64 ||
+        frame_mv[this_mode][ref_frame].as_mv.col < -64)) {
+      if (bsize == BLOCK_64X64)
+        this_rdc.rdcost = this_rdc.rdcost << 1;
+      else if (bsize >= BLOCK_32X32)
+        this_rdc.rdcost = 3 * this_rdc.rdcost >> 1;
+    }
+
     // Skipping checking: test to see if this block can be reconstructed by
     // prediction only.
     if (cpi->allow_encode_breakout) {