shithub: libvpx

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ARF in 1 pass vbr: modify skip ref_frame in nonrd_pickmode.

Speedup of ~2-3% on 1080p clips speed 6.
Neutral/negligible loss in metrics on ytlive.

Change-Id: I7ac47a4d8b58c566920bae29a94a0e8d59c36dee

--- a/vp9/encoder/vp9_pickmode.c

+++ b/vp9/encoder/vp9_pickmode.c

@@ -1567,7 +1567,8 @@

   }

 #endif

-  if (cpi->rc.frames_since_golden == 0 && !cpi->use_svc) {

+  if (cpi->rc.frames_since_golden == 0 && !cpi->use_svc &&

+      !cpi->rc.alt_ref_gf_group && !cpi->rc.last_frame_is_src_altref) {

     usable_ref_frame = LAST_FRAME;

   } else {

     usable_ref_frame = GOLDEN_FRAME;

@@ -1580,6 +1581,15 @@

     if (cpi->rc.is_src_frame_alt_ref) {

       skip_ref_find_pred[LAST_FRAME] = 1;

       skip_ref_find_pred[GOLDEN_FRAME] = 1;

+    }

+    if (cm->show_frame == 0) {

+      usable_ref_frame = GOLDEN_FRAME;

+      skip_ref_find_pred[ALTREF_FRAME] = 1;

+      if (cpi->rc.frames_since_key == 1) {

+        usable_ref_frame = LAST_FRAME;

+        skip_ref_find_pred[GOLDEN_FRAME] = 1;

+        skip_ref_find_pred[ALTREF_FRAME] = 1;

+      }

     }

   }

--- a/vp9/encoder/vp9_ratectrl.c

+++ b/vp9/encoder/vp9_ratectrl.c

@@ -353,6 +353,7 @@

   rc->reset_high_source_sad = 0;

   rc->high_source_sad_lagindex = -1;

   rc->alt_ref_gf_group = 0;

+  rc->last_frame_is_src_altref = 0;

   rc->fac_active_worst_inter = 150;

   rc->fac_active_worst_gf = 100;

   rc->force_qpmin = 0;

@@ -1480,6 +1481,7 @@

       compute_frame_low_motion(cpi);

       if (cpi->sf.use_altref_onepass) update_altref_usage(cpi);

     }

+    cpi->rc.last_frame_is_src_altref = cpi->rc.is_src_frame_alt_ref;

   }

   if (cm->frame_type != KEY_FRAME) rc->reset_high_source_sad = 0;

 }

--- a/vp9/encoder/vp9_ratectrl.h

+++ b/vp9/encoder/vp9_ratectrl.h

@@ -164,6 +164,7 @@

   uint64_t prev_avg_source_sad_lag;

   int high_source_sad_lagindex;

   int alt_ref_gf_group;

+  int last_frame_is_src_altref;

   int high_source_sad;

   int count_last_scene_change;

   int avg_frame_low_motion;