libvpx: Pull from upstream

source/libvpx/vpxstats.c

 /*
  *  Copyright (c) 2013 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 102 matching lines @@
 
     memcpy(stats->buf_ptr, pkt, len);
     stats->buf.sz += len;
     stats->buf_ptr += len;
   }
 }
 
 vpx_fixed_buf_t stats_get(stats_io_t *stats) {
   return stats->buf;
 }
-
-double vp8_mse2psnr(double samples, double peak, double mse) {
-  const int kMaxPSNR = 100;
-  double psnr = kMaxPSNR;
-
-  if (mse > 0.0)
-    psnr = 10.0 * log10(peak * peak * samples / mse);
-
-  if (psnr > kMaxPSNR)
-    psnr = kMaxPSNR;
-
-  return psnr;
-}