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 /*

  *  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 <math.h>

 #include "vpx_scale/yv12config.h"

 #define MAX_PSNR 100

 double vp9_mse2psnr(double samples, double peak, double mse) {

   double psnr;

   if (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;

 }