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45 lines
1.3 KiB
45 lines
1.3 KiB
/* |
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* Copyright 2013 The LibYuv Project Authors. All rights reserved. |
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* |
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* Use of this source code is governed by a BSD-style license |
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* that can be found in the LICENSE file in the root of the source |
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* tree. An additional intellectual property rights grant can be found |
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* in the file PATENTS. All contributing project authors may |
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* be found in the AUTHORS file in the root of the source tree. |
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*/ |
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// Get PSNR for video sequence. Assuming RAW 4:2:0 Y:Cb:Cr format |
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#ifndef UTIL_PSNR_H_ // NOLINT |
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#define UTIL_PSNR_H_ |
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#include <math.h> // For log10() |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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#if !defined(INT_TYPES_DEFINED) && !defined(UINT8_TYPE_DEFINED) |
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typedef unsigned char uint8; |
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#define UINT8_TYPE_DEFINED |
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#endif |
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static const double kMaxPSNR = 128.0; |
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// libyuv provides this function when linking library for jpeg support. |
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// TODO(fbarchard): make psnr lib compatible subset of libyuv. |
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#if !defined(HAVE_JPEG) |
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// Computer Sum of Squared Error (SSE). |
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// Pass this to ComputePSNR for final result. |
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double ComputeSumSquareError(const uint8* org, const uint8* rec, int size); |
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#endif |
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// PSNR formula: psnr = 10 * log10 (Peak Signal^2 * size / sse) |
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// Returns 128.0 (kMaxPSNR) if sse is 0 (perfect match). |
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double ComputePSNR(double sse, double size); |
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#ifdef __cplusplus |
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} // extern "C" |
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#endif |
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#endif // UTIL_PSNR_H_ // NOLINT
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