diff -r 000000000000 -r 6474c204b198 media/libyuv/util/psnr.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/media/libyuv/util/psnr.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,39 @@
+/*
+ *  Copyright 2013 The LibYuv 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.
+ */
+
+// Get PSNR for video sequence. Assuming RAW 4:2:0 Y:Cb:Cr format
+
+#ifndef UTIL_PSNR_H_  // NOLINT
+#define UTIL_PSNR_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if !defined(INT_TYPES_DEFINED) && !defined(UINT8_TYPE_DEFINED)
+typedef unsigned char uint8;
+#define UINT8_TYPE_DEFINED
+#endif
+
+static const double kMaxPSNR = 128.0;
+
+// PSNR formula: psnr = 10 * log10 (Peak Signal^2 * size / sse).
+// Returns 128.0 (kMaxPSNR) if sse is 0 (perfect match).
+double ComputePSNR(double sse, double size);
+
+// Computer Sum of Squared Error (SSE).
+// Pass this to ComputePSNR for final result.
+double ComputeSumSquareError(const uint8* org, const uint8* rec, int size);
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#endif  // UTIL_PSNR_H_  // NOLINT