shithub: libvpx

Info  •  Files  •  Log  •  Branches

Limit active best quality of layered ARF frames

For higher layer ARF frames, limit active best
quality to the qindex of the lower layer ARF
frame.

Change-Id: I957cbd8ae02313cbc94eda2175e63a26d788459a

--- a/vp9/encoder/vp9_firstpass.c

+++ b/vp9/encoder/vp9_firstpass.c

@@ -3177,6 +3177,7 @@

   gf_group->bit_allocation[0] = kf_bits;

   gf_group->update_type[0] = KF_UPDATE;

   gf_group->rf_level[0] = KF_STD;

+  gf_group->layer_depth[0] = 0;

   // Note the total error score of the kf group minus the key frame itself.

   twopass->kf_group_error_left = (kf_group_err - kf_mod_err);

--- a/vp9/encoder/vp9_firstpass.h

+++ b/vp9/encoder/vp9_firstpass.h

@@ -191,6 +191,7 @@

   int extend_maxq;

   int extend_minq_fast;

   int arnr_strength_adjustment;

+  int last_qindex_of_arf_layer[MAX_ARF_LAYERS];

   GF_GROUP gf_group;

 } TWO_PASS;

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

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

@@ -1472,10 +1472,21 @@

   // Extension to max or min Q if undershoot or overshoot is outside

   // the permitted range.

   if (frame_is_intra_only(cm) || boost_frame) {

+    const int layer_depth = gf_group->layer_depth[gf_group_index];

     active_best_quality -=

         (cpi->twopass.extend_minq + cpi->twopass.extend_minq_fast);

     active_worst_quality += (cpi->twopass.extend_maxq / 2);

+

+    if (gf_group->rf_level[gf_group_index] == GF_ARF_LOW) {

+      assert(layer_depth > 1);

+      active_best_quality =

+          VPXMAX(active_best_quality,

+                 cpi->twopass.last_qindex_of_arf_layer[layer_depth - 1]);

+    }

   } else {

+    const int max_layer_depth = gf_group->max_layer_depth;

+    assert(max_layer_depth > 0);

+

     active_best_quality -=

         (cpi->twopass.extend_minq + cpi->twopass.extend_minq_fast) / 2;

     active_worst_quality += cpi->twopass.extend_maxq;

@@ -1482,7 +1493,9 @@

     // For normal frames do not allow an active minq lower than the q used for

     // the last boosted frame.

-    active_best_quality = VPXMAX(active_best_quality, rc->last_boosted_qindex);

+    active_best_quality =

+        VPXMAX(active_best_quality,

+               cpi->twopass.last_qindex_of_arf_layer[max_layer_depth - 1]);

   }

 #if LIMIT_QRANGE_FOR_ALTREF_AND_KEY

@@ -1763,6 +1776,9 @@

   RATE_CONTROL *const rc = &cpi->rc;

   SVC *const svc = &cpi->svc;

   const int qindex = cm->base_qindex;

+  const GF_GROUP *gf_group = &cpi->twopass.gf_group;

+  const int gf_group_index = cpi->twopass.gf_group.index;

+  const int layer_depth = gf_group->layer_depth[gf_group_index];

   // Update rate control heuristics

   rc->projected_frame_size = (int)(bytes_used << 3);

@@ -1817,6 +1833,15 @@

         (cpi->refresh_golden_frame && !rc->is_src_frame_alt_ref)))) {

     rc->last_boosted_qindex = qindex;

   }

+

+  if ((qindex < cpi->twopass.last_qindex_of_arf_layer[layer_depth]) ||

+      (cm->frame_type == KEY_FRAME) ||

+      (!rc->constrained_gf_group &&

+       (cpi->refresh_alt_ref_frame ||

+        (cpi->refresh_golden_frame && !rc->is_src_frame_alt_ref)))) {

+    cpi->twopass.last_qindex_of_arf_layer[layer_depth] = qindex;

+  }

+

   if (frame_is_intra_only(cm)) rc->last_kf_qindex = qindex;

   update_buffer_level_postencode(cpi, rc->projected_frame_size);