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/**
*
* Copyright 2016-2020 Netflix, Inc.
*
* Licensed under the BSD+Patent License (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://opensource.org/licenses/BSDplusPatent
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include <math.h>
#include "mem.h"
#include "psnr_tools.h"
#include "psnr_options.h"
#define MAX(x, y) (((x) > (y)) ? (x) : (y))
#define MIN(x, y) (((x) < (y)) ? (x) : (y))
int compute_psnr(const float *ref, const float *dis, int w, int h, int ref_stride, int dis_stride, double *score, double peak, double psnr_max)
{
double noise_ = 0;
int ref_stride_ = ref_stride / sizeof(float);
int dis_stride_ = dis_stride / sizeof(float);
for (int i = 0; i < h; ++i)
{
for (int j = 0; j < w; ++j)
{
float ref_ = ref[i * ref_stride_ + j];
float dis_ = dis[i * dis_stride_ + j];
float diff = ref_ - dis_;
noise_ += diff * diff;
}
}
noise_ /= (w * h);
double eps = 1e-10;
*score = MIN(10 * log10(peak * peak / MAX(noise_, eps)), psnr_max);
return 0;
}