31 lines
841 B
C
31 lines
841 B
C
/*
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* Copyright (c) 2010 The WebM 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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#include "vpx_scale/yv12config.h"
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#include "math.h"
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#include "vp9/common/systemdependent.h" /* for vp9_clear_system_state() */
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#define MAX_PSNR 100
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double vp9_mse2psnr(double Samples, double Peak, double Mse) {
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double psnr;
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if ((double)Mse > 0.0)
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psnr = 10.0 * log10(Peak * Peak * Samples / Mse);
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else
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psnr = MAX_PSNR; // Limit to prevent / 0
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if (psnr > MAX_PSNR)
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psnr = MAX_PSNR;
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return psnr;
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}
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