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/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include "raw.h"
/* Compare the difference between two raw files */
static inline double max(double a, double b)
{
return (a > b) ? a : b;
}
int main(int argc, char **argv)
{
size_t frame1, frame2;
float *data1, *data2;
size_t i, n, changed;
double diff = 0;
double maxdiff = 0;
if (argc != 3) {
fprintf(stderr, "usage: cmpraw 1.raw 2.raw\n");
exit(1);
}
data1 = read_raw(argv[1], &frame1);
data2 = read_raw(argv[2], &frame2);
if (frame1 != frame2) {
fprintf(stderr, "mismatch size (%zu vs %zu)\n", frame1, frame2);
exit(1);
}
n = frame1 * 2;
changed = 0;
for (i = 0; i < n; i++) {
if (data1[i] != data2[i]) {
changed++;
diff += fabs(data1[i] - data2[i]);
maxdiff = max(fabs(data1[i] - data2[i]), maxdiff);
}
}
printf("avg diff = %g, max diff = %g, changed = %.3f%%\n", diff / n,
maxdiff * 32768, changed * 100.0f / n);
free(data1);
free(data2);
return 0;
}
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