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| 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 "vp9/common/vp9_systemdependent.h" /* for vp9_clear_system_state() */ |
| 15 |
| 16 #define MAX_PSNR 100 |
| 17 |
| 18 double vp9_mse2psnr(double Samples, double Peak, double Mse) { |
| 19 double psnr; |
| 20 |
| 21 if ((double)Mse > 0.0) |
| 22 psnr = 10.0 * log10(Peak * Peak * Samples / Mse); |
| 23 else |
| 24 psnr = MAX_PSNR; // Limit to prevent / 0 |
| 25 |
| 26 if (psnr > MAX_PSNR) |
| 27 psnr = MAX_PSNR; |
| 28 |
| 29 return psnr; |
| 30 } |
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