| /* |
| * Copyright (c) 2010 The WebM 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. |
| */ |
| |
| |
| #include "vpx_scale/yv12config.h" |
| #include "math.h" |
| #include "vp8/common/systemdependent.h" /* for vp8_clear_system_state() */ |
| |
| #define MAX_PSNR 60 |
| |
| double vp8_mse2psnr(double Samples, double Peak, double Mse) |
| { |
| double psnr; |
| |
| if ((double)Mse > 0.0) |
| psnr = 10.0 * log10(Peak * Peak * Samples / Mse); |
| else |
| psnr = MAX_PSNR; // Limit to prevent / 0 |
| |
| if (psnr > MAX_PSNR) |
| psnr = MAX_PSNR; |
| |
| return psnr; |
| } |
