shithub: libvpx

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vp9 svc: point ref to last when not used in KSVC.

Change-Id: Ia648a2221890dae5357ec8e64a8431fb0f77f2fc

--- a/vp9/encoder/vp9_svc_layercontext.c

+++ b/vp9/encoder/vp9_svc_layercontext.c

@@ -1018,6 +1018,7 @@

 void vp9_svc_constrain_inter_layer_pred(VP9_COMP *const cpi) {

   VP9_COMMON *const cm = &cpi->common;

   SVC *const svc = &cpi->svc;

+  const int sl = svc->spatial_layer_id;

   // Check for disabling inter-layer (spatial) prediction, if

   // svc.disable_inter_layer_pred is set. If the previous spatial layer was

   // dropped then disable the prediction from this (scaled) reference.

@@ -1027,7 +1028,7 @@

        !svc->layer_context[svc->temporal_layer_id].is_key_frame &&

        !svc->superframe_has_layer_sync) ||

       svc->disable_inter_layer_pred == INTER_LAYER_PRED_OFF ||

-      svc->drop_spatial_layer[svc->spatial_layer_id - 1]) {

+      svc->drop_spatial_layer[sl - 1]) {

     MV_REFERENCE_FRAME ref_frame;

     static const int flag_list[4] = { 0, VP9_LAST_FLAG, VP9_GOLD_FLAG,

                                       VP9_ALT_FLAG };

@@ -1036,8 +1037,16 @@

       if (yv12 != NULL && (cpi->ref_frame_flags & flag_list[ref_frame])) {

         const struct scale_factors *const scale_fac =

             &cm->frame_refs[ref_frame - 1].sf;

-        if (vp9_is_scaled(scale_fac))

+        if (vp9_is_scaled(scale_fac)) {

           cpi->ref_frame_flags &= (~flag_list[ref_frame]);

+          // Point golden/altref frame buffer index to last.

+          if (!svc->simulcast_mode) {

+            if (ref_frame == GOLDEN_FRAME)

+              cpi->gld_fb_idx = cpi->lst_fb_idx;

+            else if (ref_frame == ALTREF_FRAME)

+              cpi->alt_fb_idx = cpi->lst_fb_idx;

+          }

+        }

       }

     }

   }

@@ -1065,7 +1074,6 @@

         int fb_idx =

             ref_frame == LAST_FRAME ? cpi->lst_fb_idx : cpi->gld_fb_idx;

         int ref_flag = ref_frame == LAST_FRAME ? VP9_LAST_FLAG : VP9_GOLD_FLAG;

-        int sl = svc->spatial_layer_id;

         int disable = 1;

         if (fb_idx < 0) continue;

         if ((fb_idx == svc->lst_fb_idx[sl - 1] &&