libvpx: Pull from upstream

source/libvpx/vp8/encoder/psnr.c

 /*
  *  Copyright (c) 2010 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.
  */
 
 
 #include "vpx_scale/yv12config.h"
 #include "math.h"
 #include "vp8/common/systemdependent.h" /* for vp8_clear_system_state() */
 
-#define MAX_PSNR 60
+#define MAX_PSNR 100
 
 double vp8_mse2psnr(double Samples, double Peak, double Mse)
 {
     double psnr;
 
     if ((double)Mse > 0.0)
         psnr = 10.0 * log10(Peak * Peak * Samples / Mse);
     else
         psnr = MAX_PSNR;      /* Limit to prevent / 0 */
 
     if (psnr > MAX_PSNR)
         psnr = MAX_PSNR;
 
     return psnr;
 }