libvpx: Pull from upstream

source/libvpx/rate_hist.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 70 matching lines @@
                           (uint64_t)cfg->g_timebase.num /
                               (uint64_t)cfg->g_timebase.den;
 
   int idx = hist->frames++ % hist->samples;
   hist->pts[idx] = now;
   hist->sz[idx] = (int)pkt->data.frame.sz;
 
   if (now < cfg->rc_buf_initial_sz)
     return;
 
+  if (!cfg->rc_target_bitrate)
+    return;
+
   then = now;
 
   /* Sum the size over the past rc_buf_sz ms */
   for (i = hist->frames; i > 0 && hist->frames - i < hist->samples; i--) {
     const int i_idx = (i - 1) % hist->samples;
 
     then = hist->pts[i_idx];
     if (now - then > cfg->rc_buf_sz)
       break;
     sum_sz += hist->sz[i_idx];
@@ skipping 172 matching lines @@
   for (i = 0; i < RATE_BINS; i++) {
     if (hist->bucket[i].low == INT_MAX)
       continue;
     hist->bucket[buckets++] = hist->bucket[i];
   }
 
   fprintf(stderr, "\nRate (over %dms window):\n", cfg->rc_buf_sz);
   scale = merge_hist_buckets(hist->bucket, max_buckets, &buckets);
   show_histogram(hist->bucket, buckets, hist->total, scale);
 }