shithub: libvpx

Download patch

ref: 8fab3e82ca593328680c4388b45dd772110f41fe
parent: 185836116cb77ded17f0d2e251307db1ee27132b
author: Marco <[email protected]>
date: Wed Mar 30 12:27:25 EDT 2016 

vp9-1 pass vbr: Use average QP for active_worst_quality, for inter-frames.

And replace some operation with shift.

Change-Id: If1ea874ee05b7238d5f954e55bb3ceda804a091a


--- a/vp9/encoder/vp9_ratectrl.c
+++ b/vp9/encoder/vp9_ratectrl.c
@@ -621,15 +621,16 @@
 
   if (cpi->common.frame_type == KEY_FRAME) {
     active_worst_quality = curr_frame == 0 ? rc->worst_quality
-                                           : rc->last_q[KEY_FRAME] * 2;
+                                           : rc->last_q[KEY_FRAME] << 1;
   } else {
     if (!rc->is_src_frame_alt_ref &&
         (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
-      active_worst_quality =  curr_frame == 1 ? rc->last_q[KEY_FRAME] * 5 / 4
+      active_worst_quality =  curr_frame == 1 ? rc->last_q[KEY_FRAME] * 5 >> 2
                                               : rc->last_q[INTER_FRAME];
     } else {
-      active_worst_quality = curr_frame == 1 ? rc->last_q[KEY_FRAME] * 2
-                                             : rc->last_q[INTER_FRAME] * 2;
+      active_worst_quality = curr_frame == 1 ? rc->last_q[KEY_FRAME] << 1 :
+          VPXMIN(rc->last_q[INTER_FRAME] << 1,
+                (rc->avg_frame_qindex[INTER_FRAME] * 3 >> 1));
     }
   }
   return VPXMIN(active_worst_quality, rc->worst_quality);
@@ -662,7 +663,7 @@
                    VPXMIN(rc->avg_frame_qindex[INTER_FRAME],
                           rc->avg_frame_qindex[KEY_FRAME]) :
                    rc->avg_frame_qindex[INTER_FRAME];
-  active_worst_quality = VPXMIN(rc->worst_quality, ambient_qp * 5 / 4);
+  active_worst_quality = VPXMIN(rc->worst_quality, ambient_qp * 5 >> 2);
   if (rc->buffer_level > rc->optimal_buffer_level) {
     // Adjust down.
     // Maximum limit for down adjustment, ~30%.