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
17double 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