2 * Copyright 2013 The LibYuv Project Authors. All rights reserved.
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.
11 // Get PSNR for video sequence. Assuming RAW 4:2:0 Y:Cb:Cr format
13 #ifndef UTIL_PSNR_H_ // NOLINT
16 #include <math.h> // For log10()
22 #if !defined(INT_TYPES_DEFINED) && !defined(UINT8_TYPE_DEFINED)
23 typedef unsigned char uint8;
24 #define UINT8_TYPE_DEFINED
27 static const double kMaxPSNR = 128.0;
29 // libyuv provides this function when linking library for jpeg support.
30 // TODO(fbarchard): make psnr lib compatible subset of libyuv.
31 #if !defined(HAVE_JPEG)
32 // Computer Sum of Squared Error (SSE).
33 // Pass this to ComputePSNR for final result.
34 double ComputeSumSquareError(const uint8* org, const uint8* rec, int size);
37 // PSNR formula: psnr = 10 * log10 (Peak Signal^2 * size / sse)
38 // Returns 128.0 (kMaxPSNR) if sse is 0 (perfect match).
39 double ComputePSNR(double sse, double size);
45 #endif // UTIL_PSNR_H_ // NOLINT