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 134 matching lines @@
         lrc->buffer_level = MIN(lrc->buffer_level, lrc->maximum_buffer_size);
         lc->framerate = cpi->framerate / oxcf->ts_rate_decimator[tl];
         lrc->avg_frame_bandwidth = (int)(lc->target_bandwidth / lc->framerate);
         lrc->max_frame_bandwidth = rc->max_frame_bandwidth;
         lrc->worst_quality = rc->worst_quality;
         lrc->best_quality = rc->best_quality;
       }
     }
   } else {
     int layer_end;
-    float bitrate_alloc = 1.0;
 
     if (svc->number_temporal_layers > 1 && cpi->oxcf.rc_mode == VPX_CBR) {
       layer_end = svc->number_temporal_layers;
     } else {
       layer_end = svc->number_spatial_layers;
     }
 
     for (layer = 0; layer < layer_end; ++layer) {
       LAYER_CONTEXT *const lc = &svc->layer_context[layer];
       RATE_CONTROL *const lrc = &lc->rc;
@@ skipping 471 matching lines @@
     buf = vp9_lookahead_peek(ctx, 0);
     if (buf != NULL) {
       // Only remove the buffer when pop the highest layer.
       if (cpi->svc.spatial_layer_id == cpi->svc.number_spatial_layers - 1) {
         vp9_lookahead_pop(ctx, drain);
       }
     }
   }
   return buf;
 }