1 /* 2 * Copyright (c) 2010 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_scale/yv12config.h" 14 15 #define MAX_PSNR 100 16 17 double vp9_mse2psnr(double samples, double peak, double mse) { 18 double psnr; 19 20 if (mse > 0.0) 21 psnr = 10.0 * log10(peak * peak * samples / mse); 22 else 23 psnr = MAX_PSNR; // Limit to prevent / 0 24 25 if (psnr > MAX_PSNR) 26 psnr = MAX_PSNR; 27 28 return psnr; 29 } 30
