shithub: libvpx

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ref: 17c403d0ab58fc66072150b94f45420b2e7ddafa
parent: 228c9940ea87643368c5e79b744a34fe901d15d4
parent: 360ac89885b9e21442f8e5e2f63206da4cc6f605
author: Marco Paniconi <marpan@google.com>
date: Wed Dec 7 14:31:13 EST 2016

Merge "vp9: Adjust the weight factor for segment rate cost for aq-mode=3."

--- a/vp9/encoder/vp9_aq_cyclicrefresh.c
+++ b/vp9/encoder/vp9_aq_cyclicrefresh.c
@@ -128,16 +128,20 @@
   CYCLIC_REFRESH *const cr = cpi->cyclic_refresh;
   int bits_per_mb;
   int num8x8bl = cm->MBs << 2;
+  // Compute delta-q corresponding to qindex i.
+  int deltaq = compute_deltaq(cpi, i, cr->rate_ratio_qdelta);
   // Weight for segment prior to encoding: take the average of the target
   // number for the frame to be encoded and the actual from the previous frame.
+  // Use the target if its less.
   int target_refresh = cr->percent_refresh * cm->mi_rows * cm->mi_cols / 100;
+  double weight_segment_target = (double)(target_refresh) / num8x8bl;
   double weight_segment =
       (double)((target_refresh + cr->actual_num_seg1_blocks +
                 cr->actual_num_seg2_blocks) >>
                1) /
       num8x8bl;
-  // Compute delta-q corresponding to qindex i.
-  int deltaq = compute_deltaq(cpi, i, cr->rate_ratio_qdelta);
+  if (weight_segment_target < 7 * weight_segment / 8)
+    weight_segment = weight_segment_target;
   // Take segment weighted average for bits per mb.
   bits_per_mb = (int)((1.0 - weight_segment) *
                           vp9_rc_bits_per_mb(cm->frame_type, i,