1 /* 2 * Copyright (c) 2014 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/internal/vpx_psnr.h" 14 15 #define MAX_PSNR 100.0 16 vpx_sse_to_psnr(double samples,double peak,double sse)17double vpx_sse_to_psnr(double samples, double peak, double sse) { 18 if (sse > 0.0) { 19 const double psnr = 10.0 * log10(samples * peak * peak / sse); 20 return psnr > MAX_PSNR ? MAX_PSNR : psnr; 21 } else { 22 return MAX_PSNR; 23 } 24 } 25