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Side by Side Diff: source/libvpx/vp9/encoder/vp9_psnr.c

Issue 11555023: libvpx: Add VP9 decoder. (Closed) Base URL: svn://chrome-svn/chrome/trunk/deps/third_party/libvpx/
Patch Set: Created 8 years ago
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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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