shithub: libvpx

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vp9: Increase thr_var for 32x32 blocks in var-based partitioning.

For real-time mode, increase variance threshold for 32x32 blocks in
var-based partitioning for resolution >= 720p, so that it is more
likely to stay at 32x32 for high resolution which accelerates the
encoding speed with little/no PSNR drop.

PSNR effect on different speed settings:
speed 8 rtc: 0.02 overall PSNR drop, 0.285% SSIM drop
speed 7 rtc: 0.196% overall PSNR increase, 0.066% SSIM increase
speed 5 rtc_derf: no effect.

Speed up:
gips_motion_WHD, 1mbps: 2.5% faster on speed 7, 2.6% faster on speed8
gips_stat_WHD, 1mbps: 4.6% faster on speed 7, 5.6% faster on speed8

Change-Id: Ie7c33c4d2dd7d09294917e031357fc5476c3a4bb

--- a/vp9/encoder/vp9_encodeframe.c

+++ b/vp9/encoder/vp9_encodeframe.c

@@ -503,16 +503,18 @@

       else if (noise_level < kLow)

         threshold_base = (7 * threshold_base) >> 3;

     }

+    thresholds[0] = threshold_base;

+    thresholds[2] = threshold_base << cpi->oxcf.speed;

     if (cm->width <= 352 && cm->height <= 288) {

       thresholds[0] = threshold_base >> 3;

       thresholds[1] = threshold_base >> 1;

       thresholds[2] = threshold_base << 3;

-    } else {

-      thresholds[0] = threshold_base;

+    } else if (cm->width < 1280 && cm->height < 720) {

       thresholds[1] = (5 * threshold_base) >> 2;

-      if (cm->width >= 1920 && cm->height >= 1080)

-        thresholds[1] = (7 * threshold_base) >> 2;

-      thresholds[2] = threshold_base << cpi->oxcf.speed;

+    } else if (cm->width < 1920 && cm->height < 1080) {

+      thresholds[1] = threshold_base << 1;

+    } else {

+      thresholds[1] = (5 * threshold_base) >> 1;

     }

   }

 }