libvpx: Pull from upstream

source/libvpx/vp9/encoder/vp9_svc_layercontext.c

 /*
  *  Copyright (c) 2014 The WebM project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 51 matching lines @@
                                           oxcf->best_allowed_q) / 2;
       lrc->avg_frame_qindex[INTER_FRAME] = (oxcf->worst_allowed_q +
                                             oxcf->best_allowed_q) / 2;
       if (oxcf->ss_play_alternate[layer])
         lc->alt_ref_idx = alt_ref_idx++;
       else
         lc->alt_ref_idx = -1;
       lc->gold_ref_idx = -1;
     }
 
-    lrc->buffer_level = vp9_rescale((int)(oxcf->starting_buffer_level_ms),
-                                    lc->target_bandwidth, 1000);
+    lrc->buffer_level = oxcf->starting_buffer_level_ms *
+                            lc->target_bandwidth / 1000;
     lrc->bits_off_target = lrc->buffer_level;
   }
 
   // Still have extra buffer for base layer golden frame
   if (svc->number_spatial_layers > 1 && alt_ref_idx < REF_FRAMES)
     svc->layer_context[0].gold_ref_idx = alt_ref_idx;
 }
 
 // Update the layer context from a change_config() call.
 void vp9_update_layer_context_change_config(VP9_COMP *const cpi,
@@ skipping 271 matching lines @@
       buf->svc_params[cpi->svc.spatial_layer_id].spatial_layer = -1;
       if (cpi->svc.spatial_layer_id == cpi->svc.number_spatial_layers - 1) {
         vp9_lookahead_pop(ctx, drain);
       }
     }
   }
 
   return buf;
 }
 #endif