ref: 6d1513274296d0d7846604c29c94b51d36b8c0b6
dir: /vp8/encoder/psnr.c/
/*
* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "vpx_scale/yv12config.h"
#include "math.h"
#include "vp8/common/systemdependent.h" /* for vp8_clear_system_state() */
#define MAX_PSNR 100
double vp8_mse2psnr(double Samples, double Peak, double Mse)
{
double psnr;
if ((double)Mse > 0.0)
psnr = 10.0 * log10(Peak * Peak * Samples / Mse);
else
psnr = MAX_PSNR; /* Limit to prevent / 0 */
if (psnr > MAX_PSNR)
psnr = MAX_PSNR;
return psnr;
}