ref: cb1d152719a3f0d0dff461e7a712eb49402b0933
dir: /vpx/src/vpx_psnr.c/
/*
* Copyright (c) 2014 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 <math.h>
#include "vpx/internal/vpx_psnr.h"
#define MAX_PSNR 100.0
double vpx_sse_to_psnr(double samples, double peak, double sse) {
if (sse > 0.0) {
const double psnr = 10.0 * log10(samples * peak * peak / sse);
return psnr > MAX_PSNR ? MAX_PSNR : psnr;
} else {
return MAX_PSNR;
}
}