shithub: libvpx

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vp9: Adjustments to cyclic refresh for high motion.

For aq-mode=3: refactor the condition for turning off
the refresh. Add some adjustments for high motion content.

No/little change in RTC metrics, only affects high motion case.

Change-Id: I7da8eabfb0e61db014be4562806f72ee5ef4a43b

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

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

@@ -277,8 +277,6 @@

       !cpi->oxcf.gf_cbr_boost_pct) {

     // Force this frame as a golden update frame if this frame changes the

     // resolution (resize_pending != 0).

-    // TODO(marpan): check on forcing golden update if the background has very

-    // high motion in current frame.

     if (cpi->resize_pending != 0) {

       vp9_cyclic_refresh_set_golden_update(cpi);

       rc->frames_till_gf_update_due = rc->baseline_gf_interval;

@@ -316,6 +314,8 @@

   else

     rc->baseline_gf_interval = 40;

   if (cpi->oxcf.rc_mode == VPX_VBR) rc->baseline_gf_interval = 20;

+  if (rc->avg_frame_low_motion < 50 && rc->frames_since_key > 40)

+    rc->baseline_gf_interval = 10;

 }

 // Update the segmentation map, and related quantities: cyclic refresh map,

@@ -425,6 +425,13 @@

   int target_refresh = 0;

   double weight_segment_target = 0;

   double weight_segment = 0;

+  cr->apply_cyclic_refresh = 1;

+  if (cm->frame_type == KEY_FRAME || cpi->svc.temporal_layer_id > 0 ||

+      (!cpi->use_svc && rc->avg_frame_low_motion < 55 &&

+       rc->frames_since_key > 40)) {

+    cr->apply_cyclic_refresh = 0;

+    return;

+  }

   cr->percent_refresh = 10;

   if (cr->reduce_refresh) cr->percent_refresh = 5;

   cr->max_qdelta_perc = 60;

@@ -493,14 +500,8 @@

   const RATE_CONTROL *const rc = &cpi->rc;

   CYCLIC_REFRESH *const cr = cpi->cyclic_refresh;

   struct segmentation *const seg = &cm->seg;

-  // TODO(marpan): Look into whether we should reduce the amount/delta-qp

-  // instead of completely shutting off at low bitrates. For now keep it on.

-  // const int apply_cyclic_refresh = apply_cyclic_refresh_bitrate(cm, rc);

-  const int apply_cyclic_refresh = 1;

   if (cm->current_video_frame == 0) cr->low_content_avg = 0.0;

-  // Don't apply refresh on key frame or temporal enhancement layer frames.

-  if (!apply_cyclic_refresh || (cm->frame_type == KEY_FRAME) ||

-      (cpi->force_update_segmentation) || (cpi->svc.temporal_layer_id > 0)) {

+  if (!cr->apply_cyclic_refresh || (cpi->force_update_segmentation)) {

     // Set segmentation map to 0 and disable.

     unsigned char *const seg_map = cpi->segmentation_map;

     memset(seg_map, 0, cm->mi_rows * cm->mi_cols);

--- a/vp9/encoder/vp9_aq_cyclicrefresh.h

+++ b/vp9/encoder/vp9_aq_cyclicrefresh.h

@@ -67,6 +67,7 @@

   int qindex_delta[3];

   int reduce_refresh;

   double weight_segment;

+  int apply_cyclic_refresh;

 };

 struct VP9_COMP;

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

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

@@ -547,6 +547,7 @@

 int vp9_rc_regulate_q(const VP9_COMP *cpi, int target_bits_per_frame,

                       int active_best_quality, int active_worst_quality) {

   const VP9_COMMON *const cm = &cpi->common;

+  CYCLIC_REFRESH *const cr = cpi->cyclic_refresh;

   int q = active_worst_quality;

   int last_error = INT_MAX;

   int i, target_bits_per_mb, bits_per_mb_at_this_q;

@@ -561,7 +562,7 @@

   do {

     if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ && cm->seg.enabled &&

-        cpi->svc.temporal_layer_id == 0 &&

+        cr->apply_cyclic_refresh &&

         (!cpi->oxcf.gf_cbr_boost_pct || !cpi->refresh_golden_frame)) {

       bits_per_mb_at_this_q =

           (int)vp9_cyclic_refresh_rc_bits_per_mb(cpi, i, correction_factor);