1 /*
2  *  Copyright (c) 2014 The WebM project authors. All Rights Reserved.
3  *
4  *  Use of this source code is governed by a BSD-style license
5  *  that can be found in the LICENSE file in the root of the source
6  *  tree. An additional intellectual property rights grant can be found
7  *  in the file PATENTS.  All contributing project authors may
8  *  be found in the AUTHORS file in the root of the source tree.
9  */
10 
11 #include <math.h>
12 
13 #include "vpx/internal/vpx_psnr.h"
14 
15 #define MAX_PSNR 100.0
16 
vpx_sse_to_psnr(double samples,double peak,double sse)17 double vpx_sse_to_psnr(double samples, double peak, double sse) {
18   if (sse > 0.0) {
19     const double psnr = 10.0 * log10(samples * peak * peak / sse);
20     return psnr > MAX_PSNR ? MAX_PSNR : psnr;
21   } else {
22     return MAX_PSNR;
23   }
24 }
25