1/*
2 *  Copyright (c) 2012 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#ifndef TEST_UTIL_H_
12#define TEST_UTIL_H_
13
14#include <stdio.h>
15#include <math.h>
16#include "third_party/googletest/src/include/gtest/gtest.h"
17#include "vpx/vpx_image.h"
18
19// Macros
20#define GET_PARAM(k) std::tr1::get< k >(GetParam())
21
22static double compute_psnr(const vpx_image_t *img1,
23                           const vpx_image_t *img2) {
24  assert((img1->fmt == img2->fmt) &&
25         (img1->d_w == img2->d_w) &&
26         (img1->d_h == img2->d_h));
27
28  const unsigned int width_y  = img1->d_w;
29  const unsigned int height_y = img1->d_h;
30  unsigned int i, j;
31
32  int64_t sqrerr = 0;
33  for (i = 0; i < height_y; ++i)
34    for (j = 0; j < width_y; ++j) {
35      int64_t d = img1->planes[VPX_PLANE_Y][i * img1->stride[VPX_PLANE_Y] + j] -
36                  img2->planes[VPX_PLANE_Y][i * img2->stride[VPX_PLANE_Y] + j];
37      sqrerr += d * d;
38    }
39  double mse = static_cast<double>(sqrerr) / (width_y * height_y);
40  double psnr = 100.0;
41  if (mse > 0.0) {
42    psnr = 10 * log10(255.0 * 255.0 / mse);
43  }
44  return psnr;
45}
46
47#endif  // TEST_UTIL_H_
48