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diff --git a/third_party/aom/test/util.h b/third_party/aom/test/util.h
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+++ b/third_party/aom/test/util.h
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+/*
+ * Copyright (c) 2016, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+#ifndef TEST_UTIL_H_
+#define TEST_UTIL_H_
+
+#include <stdio.h>
+#include <math.h>
+#include "third_party/googletest/src/googletest/include/gtest/gtest.h"
+#include "aom/aom_image.h"
+
+// Macros
+#define GET_PARAM(k) std::tr1::get<k>(GetParam())
+
+inline double compute_psnr(const aom_image_t *img1, const aom_image_t *img2) {
+  assert((img1->fmt == img2->fmt) && (img1->d_w == img2->d_w) &&
+         (img1->d_h == img2->d_h));
+
+  const unsigned int width_y = img1->d_w;
+  const unsigned int height_y = img1->d_h;
+  unsigned int i, j;
+
+  int64_t sqrerr = 0;
+  for (i = 0; i < height_y; ++i)
+    for (j = 0; j < width_y; ++j) {
+      int64_t d = img1->planes[AOM_PLANE_Y][i * img1->stride[AOM_PLANE_Y] + j] -
+                  img2->planes[AOM_PLANE_Y][i * img2->stride[AOM_PLANE_Y] + j];
+      sqrerr += d * d;
+    }
+  double mse = static_cast<double>(sqrerr) / (width_y * height_y);
+  double psnr = 100.0;
+  if (mse > 0.0) {
+    psnr = 10 * log10(255.0 * 255.0 / mse);
+  }
+  return psnr;
+}
+
+#endif  // TEST_UTIL_H_