shithub: libvpx

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vp9-rtc: Disable cyclic refresh under some conditions

cyclic refresh does not work for speeds <= 4, so disable
it for this case. And dynamically disable it when
average_qp is close to MAXQ (only for non-svc), to improve
quality/rate control at very low bitrates.

Change-Id: I447be43aef0fbb80f4a30d81e11658b58744eae5

--- a/vp9/encoder/vp9_aq_cyclicrefresh.c

+++ b/vp9/encoder/vp9_aq_cyclicrefresh.c

@@ -481,6 +481,7 @@

   int thresh_low_motion = 20;

   int qp_thresh = VPXMIN((cpi->oxcf.content == VP9E_CONTENT_SCREEN) ? 35 : 20,

                          rc->best_quality << 1);

+  int qp_max_thresh = 117 * MAXQ >> 7;

   cr->apply_cyclic_refresh = 1;

   if (frame_is_intra_only(cm) || cpi->svc.temporal_layer_id > 0 ||

       is_lossless_requested(&cpi->oxcf) ||

@@ -488,7 +489,9 @@

       (cpi->use_svc &&

        cpi->svc.layer_context[cpi->svc.temporal_layer_id].is_key_frame) ||

       (!cpi->use_svc && rc->avg_frame_low_motion < thresh_low_motion &&

-       rc->frames_since_key > 40)) {

+       rc->frames_since_key > 40) ||

+      (!cpi->use_svc && rc->avg_frame_qindex[INTER_FRAME] > qp_max_thresh &&

+       rc->frames_since_key > 20)) {

     cr->apply_cyclic_refresh = 0;

     return;

   }

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

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

@@ -793,6 +793,10 @@

     // small step_param for all spatial layers.

     sf->mv.fullpel_search_step_param = 2;

   }

+  // TODO(marpan): There is regression for aq-mode=3 speed <= 4, force it

+  // off for now.

+  if (speed <= 4 && cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ)

+    cpi->oxcf.aq_mode = 0;

 }

 void vp9_set_speed_features_framesize_dependent(VP9_COMP *cpi, int speed) {