1 /* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
2 * Use of this source code is governed by a BSD-style license that can be
3 * found in the LICENSE file.
4 */
5
6 #include <math.h>
7 #include <stdio.h>
8 #include <stdlib.h>
9 #include <sys/types.h>
10 #include <sys/stat.h>
11 #include <fcntl.h>
12 #include <unistd.h>
13 #include "raw.h"
14
15 /* Compare the difference between two raw files */
16
max(double a,double b)17 static inline double max(double a, double b)
18 {
19 return (a > b) ? a : b;
20 }
21
main(int argc,char ** argv)22 int main(int argc, char **argv)
23 {
24 size_t frame1, frame2;
25 float *data1, *data2;
26 size_t i, n, changed;
27 double diff = 0;
28 double maxdiff = 0;
29
30 if (argc != 3) {
31 fprintf(stderr, "usage: cmpraw 1.raw 2.raw\n");
32 exit(1);
33 }
34
35 data1 = read_raw(argv[1], &frame1);
36 data2 = read_raw(argv[2], &frame2);
37
38 if (frame1 != frame2) {
39 fprintf(stderr, "mismatch size (%zu vs %zu)\n", frame1, frame2);
40 exit(1);
41 }
42
43 n = frame1 * 2;
44 changed = 0;
45 for (i = 0; i < n; i++) {
46 if (data1[i] != data2[i]) {
47 changed++;
48 diff += fabs(data1[i] - data2[i]);
49 maxdiff = max(fabs(data1[i] - data2[i]), maxdiff);
50 }
51 }
52 printf("avg diff = %g, max diff = %g, changed = %.3f%%\n",
53 diff / n, maxdiff * 32768, changed*100.0f/n);
54
55 free(data1);
56 free(data2);
57 return 0;
58 }
59