shithub: libvpx

Download patch

ref: 1541211f7e63da60005dd56cba3bb3ea47277649
parent: f95f687e22e711c5fb53cad3d4a86a1428b1dcc5
parent: b0509e8868a2fb1d64ea015cd9bbf125fd3ddcaa
author: Jingning Han <jingning@google.com>
date: Fri May 24 12:35:27 EDT 2019 

Merge "Increase active best quality linearly"


--- a/vp9/encoder/vp9_firstpass.c
+++ b/vp9/encoder/vp9_firstpass.c
@@ -2648,6 +2648,17 @@
     rc->source_alt_ref_pending = 0;
   }
 
+#define LAST_ALR_ACTIVE_BEST_QUALITY_ADJUSTMENT_FACTOR 0.2
+  rc->arf_active_best_quality_adjustment_factor = 1.0;
+  if (rc->source_alt_ref_pending && !is_lossless_requested(&cpi->oxcf) &&
+      rc->frames_to_key <= rc->arf_active_best_quality_adjustment_window) {
+    rc->arf_active_best_quality_adjustment_factor =
+        LAST_ALR_ACTIVE_BEST_QUALITY_ADJUSTMENT_FACTOR +
+        (1.0 - LAST_ALR_ACTIVE_BEST_QUALITY_ADJUSTMENT_FACTOR) *
+            (rc->frames_to_key - i) /
+            VPXMAX(1, (rc->arf_active_best_quality_adjustment_window - i));
+  }
+
 #ifdef AGGRESSIVE_VBR
   // Limit maximum boost based on interval length.
   rc->gfu_boost = VPXMIN((int)rc->gfu_boost, i * 140);
@@ -3195,6 +3206,11 @@
     // Default to normal-sized frame on keyframes.
     cpi->rc.next_frame_size_selector = UNSCALED;
   }
+#define ARF_ACTIVE_BEST_QUALITY_ADJUSTMENT_WINDOW_SIZE 64
+  // TODO(ravi.chaudhary@ittiam.com): Experiment without the below min
+  // condition. This might be helpful for small key frame intervals.
+  rc->arf_active_best_quality_adjustment_window =
+      VPXMIN(ARF_ACTIVE_BEST_QUALITY_ADJUSTMENT_WINDOW_SIZE, rc->frames_to_key);
 }
 
 static int is_skippable_frame(const VP9_COMP *cpi) {
--- a/vp9/encoder/vp9_ratectrl.c
+++ b/vp9/encoder/vp9_ratectrl.c
@@ -435,6 +435,7 @@
   rc->last_post_encode_dropped_scene_change = 0;
   rc->use_post_encode_drop = 0;
   rc->ext_use_post_encode_drop = 0;
+  rc->arf_active_best_quality_adjustment_factor = 1.0;
 }
 
 static int check_buffer_above_thresh(VP9_COMP *cpi, int drop_mark) {
@@ -1415,6 +1416,8 @@
   int active_worst_quality = cpi->twopass.active_worst_quality;
   int q;
   int *inter_minq;
+  int arf_active_best_quality_adjustment, arf_active_best_quality_max;
+  int *arfgf_high_motion_minq;
   const int boost_frame =
       !rc->is_src_frame_alt_ref &&
       (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame);
@@ -1441,6 +1444,14 @@
       if (q < cq_level) q = cq_level;
     }
     active_best_quality = get_gf_active_quality(cpi, q, cm->bit_depth);
+
+    ASSIGN_MINQ_TABLE(cm->bit_depth, arfgf_high_motion_minq);
+    arf_active_best_quality_max = arfgf_high_motion_minq[q];
+    arf_active_best_quality_adjustment =
+        arf_active_best_quality_max - active_best_quality;
+    active_best_quality = arf_active_best_quality_max -
+                          (int)(arf_active_best_quality_adjustment *
+                                rc->arf_active_best_quality_adjustment_factor);
 
     // Modify best quality for second level arfs. For mode VPX_Q this
     // becomes the baseline frame q.
--- a/vp9/encoder/vp9_ratectrl.h
+++ b/vp9/encoder/vp9_ratectrl.h
@@ -197,6 +197,8 @@
   int ext_use_post_encode_drop;
 
   int damped_adjustment[RATE_FACTOR_LEVELS];
+  double arf_active_best_quality_adjustment_factor;
+  int arf_active_best_quality_adjustment_window;
 } RATE_CONTROL;
 
 struct VP9_COMP;