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 12 #include "vpx_scale/yv12config.h" 13 #include "math.h" 14 #include "vp8/common/systemdependent.h" /* for vp8_clear_system_state() */ 15 16 #define MAX_PSNR 60 17 18 double vp8_mse2psnr(double Samples, double Peak, double Mse) 19 { 20 double psnr; 21 22 if ((double)Mse > 0.0) 23 psnr = 10.0 * log10(Peak * Peak * Samples / Mse); 24 else 25 psnr = MAX_PSNR; // Limit to prevent / 0 26 27 if (psnr > MAX_PSNR) 28 psnr = MAX_PSNR; 29 30 return psnr; 31 } 32
