shithub: libvpx

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vp9-svc: Add check/reset for long term reference.

Add check and reset (turn off) usage of long term
reference if some conditons (layer id of reference vs
current frame) are not met.

Change-Id: Ie3a84e3618f4fc4d5f8da4e67316cfbefb8bae78

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

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

@@ -1092,13 +1092,16 @@

     }

   } else if (svc->use_gf_temporal_ref_current_layer &&

              !svc->layer_context[svc->temporal_layer_id].is_key_frame) {

-    // If the usage of golden as second long term reference is enabled for this

-    // layer, then temporal_layer_id of that reference must be base temporal

-    // layer 0, and spatial_layer_id of that reference must be same as current

-    // spatial_layer_id.

-    assert(svc->fb_idx_spatial_layer_id[cpi->gld_fb_idx] ==

-           svc->spatial_layer_id);

-    assert(svc->fb_idx_temporal_layer_id[cpi->gld_fb_idx] == 0);

+    // For the usage of golden as second long term reference: the

+    // temporal_layer_id of that reference must be base temporal layer 0, and

+    // spatial_layer_id of that reference must be same as current

+    // spatial_layer_id. If not, disable feature.

+    // TODO(marpan): Investigate when this can happen, and maybe put this check

+    // and reset in a different place.

+    if (svc->fb_idx_spatial_layer_id[cpi->gld_fb_idx] !=

+            svc->spatial_layer_id ||

+        svc->fb_idx_temporal_layer_id[cpi->gld_fb_idx] != 0)

+      svc->use_gf_temporal_ref_current_layer = 0;

   }

 }