media/libvpx/vp8/encoder/psnr.c@ac0c01689b40 (annotated)
media/libvpx/vp8/encoder/psnr.c
Thu, 15 Jan 2015 15:59:08 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 15 Jan 2015 15:59:08 +0100
- branch
- TOR_BUG_9701
- changeset 10
- ac0c01689b40
- permissions
- -rw-r--r--
Implement a real Private Browsing Mode condition by changing the API/ABI;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.
| michael@0 | 1 | /* |
| michael@0 | 2 | * Copyright (c) 2010 The WebM project authors. All Rights Reserved. |
| michael@0 | 3 | * |
| michael@0 | 4 | * Use of this source code is governed by a BSD-style license |
| michael@0 | 5 | * that can be found in the LICENSE file in the root of the source |
| michael@0 | 6 | * tree. An additional intellectual property rights grant can be found |
| michael@0 | 7 | * in the file PATENTS. All contributing project authors may |
| michael@0 | 8 | * be found in the AUTHORS file in the root of the source tree. |
| michael@0 | 9 | */ |
| michael@0 | 10 | |
| michael@0 | 11 | |
| michael@0 | 12 | #include "vpx_scale/yv12config.h" |
| michael@0 | 13 | #include "math.h" |
| michael@0 | 14 | #include "vp8/common/systemdependent.h" /* for vp8_clear_system_state() */ |
| michael@0 | 15 | |
| michael@0 | 16 | #define MAX_PSNR 100 |
| michael@0 | 17 | |
| michael@0 | 18 | double vp8_mse2psnr(double Samples, double Peak, double Mse) |
| michael@0 | 19 | { |
| michael@0 | 20 | double psnr; |
| michael@0 | 21 | |
| michael@0 | 22 | if ((double)Mse > 0.0) |
| michael@0 | 23 | psnr = 10.0 * log10(Peak * Peak * Samples / Mse); |
| michael@0 | 24 | else |
| michael@0 | 25 | psnr = MAX_PSNR; /* Limit to prevent / 0 */ |
| michael@0 | 26 | |
| michael@0 | 27 | if (psnr > MAX_PSNR) |
| michael@0 | 28 | psnr = MAX_PSNR; |
| michael@0 | 29 | |
| michael@0 | 30 | return psnr; |
| michael@0 | 31 | } |
