shithub: libvpx

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Enable encode breakout in real time

For real time speed 7, once encode breakout is on(i.e. encoding
setting --static-thresh=1), a proper encode breakout threshold
is set to speed up the encoder.

Set --static-thresh=1, RTC set borg test showed a slight overall
psnr loss of 0.162%, but ssim gain of 0.287%. The average speedup
on RTC set is 6%, and for some clips, the speedup can be 10+%.

Change-Id: Id522d9ce779ff7c699936d13d0c47083de4afb85

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

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

@@ -280,6 +280,8 @@

   }

   if (speed >= 7) {

     sf->lpf_pick = LPF_PICK_MINIMAL_LPF;

+    sf->encode_breakout_thresh = (MIN(cm->width, cm->height) >= 720) ?

+        800 : 300;

   }

   if (speed >= 8) {

     int i;

@@ -349,6 +351,7 @@

   // to FIXED_PARTITION.

   sf->always_this_block_size = BLOCK_16X16;

   sf->search_type_check_frequency = 50;

+  sf->encode_breakout_thresh = 0;

   // Recode loop tolerence %.

   sf->recode_tolerance = 25;

@@ -392,4 +395,8 @@

   if (!cpi->oxcf.frame_periodic_boost) {

     sf->max_delta_qindex = 0;

   }

+

+  if (cpi->encode_breakout && oxcf->mode == REALTIME &&

+      sf->encode_breakout_thresh > cpi->encode_breakout)

+    cpi->encode_breakout = sf->encode_breakout_thresh;

 }

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

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

@@ -357,6 +357,10 @@

   // can be reused in final block encoding process. It is enabled only for real-

   // time mode speed 6.

   int reuse_inter_pred_sby;

+

+  // This variable sets the encode_breakout threshold. Currently, it is only

+  // enabled in real time mode.

+  int encode_breakout_thresh;

 } SPEED_FEATURES;

 struct VP9_COMP;