commit 6217782fb9d166db217ef6d6973f08ce11d5d3f3
author Jingning Han <jingning@google.com> Thu Jan 11 08:02:06 2018 -0800
committer Jingning Han <jingning@google.com> Thu Jan 11 22:22:31 2018 +0000
tree c262cecf690d65a0a63e50c005ab1e70331c5997
parent 16f38c2cabc6a298ed423a0bae19e8ebe4ae4b04

Drop repeated tx size search from intra mode txfm RD

When the coding block size is below 16x16, the current tx size
search loop may end up searching 4x4 transform size multiple times.
This commit skips the redundant search steps. Tested a a few
1080p clips at 4 Mbps, the encoding speed is up by 10% for key
frame coding, and 3% for overall.

Change-Id: Ifbb27bad1ec55ef0011b1e789d995f36b3f4605e

av1/encoder/rdopt.c

diff --git a/av1/encoder/rdopt.c b/av1/encoder/rdopt.c
index 07fe17a..d40053a 100644
--- a/av1/encoder/rdopt.c
+++ b/av1/encoder/rdopt.c
@@ -2498,6 +2498,7 @@
       if (mbmi->sb_type < BLOCK_8X8 && is_inter) break;
 #endif  // !USE_TXTYPE_SEARCH_FOR_SUB8X8_IN_CB4X4
     }
+    if (n == TX_4X4) break;
   }
   mbmi->tx_size = best_tx_size;
   mbmi->tx_type = best_tx_type;