shithub: libvpx

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Add speed feture to control tx size search depth

Set the max depth as 2 for speed 0.

Compression(negative means gain):
        speed 0     speed 1
lowres   -0.01%      0.00%
midres    0.05%     -0.01%
hdres    -0.01%      0.01%

Encoding speed gain:
Tested on crowd_run_1080p 30 frames
Fixed QP = 20, speed 0: 669.7s -> 656.1s
               speed 1: 104.5s -> 101.5s
Fixed QP = 40, speed 0: 440.7s -> 435.8s
               speed 1:  47.7s ->  45.1s

Change-Id: I61bc13818c72317b9f1d596727d54a906b20c012

--- a/vp9/encoder/vp9_rdopt.c

+++ b/vp9/encoder/vp9_rdopt.c

@@ -858,7 +858,7 @@

   if (cm->tx_mode == TX_MODE_SELECT) {

     start_tx = max_tx_size;

-    end_tx = 0;

+    end_tx = VPXMAX(start_tx - cpi->sf.tx_size_search_depth, 0);

   } else {

     TX_SIZE chosen_tx_size =

         VPXMIN(max_tx_size, tx_mode_to_biggest_tx_size[cm->tx_mode]);

--- a/vp9/encoder/vp9_speed_features.c

+++ b/vp9/encoder/vp9_speed_features.c

@@ -817,6 +817,7 @@

   // Some speed-up features even for best quality as minimal impact on quality.

   sf->adaptive_rd_thresh = 1;

   sf->tx_size_search_breakout = 1;

+  sf->tx_size_search_depth = 2;

   sf->exhaustive_searches_thresh =

       (cpi->twopass.fr_content_type == FC_GRAPHICS_ANIMATION) ? (1 << 20)

--- a/vp9/encoder/vp9_speed_features.h

+++ b/vp9/encoder/vp9_speed_features.h

@@ -272,6 +272,9 @@

   // for intra and model coefs for the rest.

   TX_SIZE_SEARCH_METHOD tx_size_search_method;

+  // How many levels of tx size to search, starting from the largest.

+  int tx_size_search_depth;

+

   // Low precision 32x32 fdct keeps everything in 16 bits and thus is less

   // precise but significantly faster than the non lp version.

   int use_lp32x32fdct;