commit 8d006a16c53e10d481d1df148140ee7c2561460e
author Jingning Han <jingning@google.com> Mon Feb 29 15:20:12 2016 -0800
committer Jingning Han <jingning@google.com> Mon Feb 29 16:50:35 2016 -0800
tree 41a06f56f37b789bffd4ccff8ed136e6795b5b20
parent 1ff2935ebf6c537340861bd590329ba5a49b96e3

Back port partition rate cost estimate fix to VP9

This commit back ports the fix from
https://chromium-review.googlesource.com/#/c/326940

It corrects the block partition context fetching in rate-distortion
optimization. It improves the average coding performance of speed 0:
derf    0.098%
hevcmr  0.102%
stdhd   0.282%

Change-Id: I8bcc6fe40ba5c6b50a6136daac116dcc738937ec

vp9/encoder/vp9_encodeframe.c

diff --git a/vp9/encoder/vp9_encodeframe.c b/vp9/encoder/vp9_encodeframe.c
index 4109c19..47a9d87 100644
--- a/vp9/encoder/vp9_encodeframe.c
+++ b/vp9/encoder/vp9_encodeframe.c
@@ -2439,7 +2439,8 @@
   PARTITION_CONTEXT sl[8], sa[8];
   TOKENEXTRA *tp_orig = *tp;
   PICK_MODE_CONTEXT *ctx = &pc_tree->none;
-  int i, pl;
+  int i;
+  const int pl = partition_plane_context(xd, mi_row, mi_col, bsize);
   BLOCK_SIZE subsize;
   RD_COST this_rdc, sum_rdc, best_rdc;
   int do_split = bsize >= BLOCK_8X8;
@@ -2587,7 +2588,6 @@
                      &this_rdc, bsize, ctx, best_rdc.rdcost);
     if (this_rdc.rate != INT_MAX) {
       if (bsize >= BLOCK_8X8) {
-        pl = partition_plane_context(xd, mi_row, mi_col, bsize);
         this_rdc.rate += cpi->partition_cost[pl][PARTITION_NONE];
         this_rdc.rdcost = RDCOST(x->rdmult, x->rddiv,
                                  this_rdc.rate, this_rdc.dist);
@@ -2706,7 +2706,6 @@
     }
 
     if (sum_rdc.rdcost < best_rdc.rdcost && i == 4) {
-      pl = partition_plane_context(xd, mi_row, mi_col, bsize);
       sum_rdc.rate += cpi->partition_cost[pl][PARTITION_SPLIT];
       sum_rdc.rdcost = RDCOST(x->rdmult, x->rddiv,
                               sum_rdc.rate, sum_rdc.dist);
@@ -2772,7 +2771,6 @@
     }
 
     if (sum_rdc.rdcost < best_rdc.rdcost) {
-      pl = partition_plane_context(xd, mi_row, mi_col, bsize);
       sum_rdc.rate += cpi->partition_cost[pl][PARTITION_HORZ];
       sum_rdc.rdcost = RDCOST(x->rdmult, x->rddiv, sum_rdc.rate, sum_rdc.dist);
       if (sum_rdc.rdcost < best_rdc.rdcost) {
@@ -2824,7 +2822,6 @@
     }
 
     if (sum_rdc.rdcost < best_rdc.rdcost) {
-      pl = partition_plane_context(xd, mi_row, mi_col, bsize);
       sum_rdc.rate += cpi->partition_cost[pl][PARTITION_VERT];
       sum_rdc.rdcost = RDCOST(x->rdmult, x->rddiv,
                               sum_rdc.rate, sum_rdc.dist);