commit eafb2e62ac64c4be1b05d366f1d3f7299d80aba8
author Hui Su <huisu@google.com> Tue Oct 18 10:21:36 2016 -0700
committer Yaowu Xu <yaowu@google.com> Tue Oct 18 11:26:11 2016 -0700
tree 60558043148fa50bb271187573602cb8952df1c9
parent 3f16725ff2030b0574dae123c8962180a556bdf9

Skip 4x4 transform if maximum possible transform is 32x32

On average no compression performance changes. Encoding speed is
increased by 10~20% on some test clips in the derf set.

Change-Id: I9856caaa260303f6f6259686671bed7d51012277

av1/encoder/rdopt.c

diff --git a/av1/encoder/rdopt.c b/av1/encoder/rdopt.c
index 2bd7888..bd5ae7e 100644
--- a/av1/encoder/rdopt.c
+++ b/av1/encoder/rdopt.c
@@ -1401,7 +1401,7 @@
     evaluate_rect_tx = is_rect_tx_allowed(xd, mbmi);
 #endif  // CONFIG_EXT_TX && CONFIG_RECT_TX
     start_tx = max_tx_size;
-    end_tx = 0;
+    end_tx = (max_tx_size == TX_32X32) ? TX_8X8 : TX_4X4;
   } else {
     const TX_SIZE chosen_tx_size =
         tx_size_from_tx_mode(bs, cm->tx_mode, is_inter);