1 /*
2 * compare.c
3 * Copyright (C) 2000-2002 Michel Lespinasse <walken@zoy.org>
4 * Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
5 *
6 * This file is part of a52dec, a free ATSC A-52 stream decoder.
7 * See http://liba52.sourceforge.net/ for updates.
8 *
9 * a52dec is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * a52dec is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23
24 #include <stdio.h>
25 #include <math.h>
26
main(int argc,char ** argv)27 int main (int argc, char ** argv)
28 {
29 FILE * f1;
30 FILE * f2;
31 float buf1[512];
32 float buf2[512];
33 int i, j;
34 int total = 0;
35 double max = 0, err = 0, square = 0;
36
37 if (argc != 3)
38 return 1;
39 f1 = fopen (argv[1], "rb");
40 f2 = fopen (argv[2], "rb");
41 if ((f1 == NULL) || (f2 == NULL)) {
42 printf ("cannot open file %s\n", (f1 == NULL) ? argv[1] : argv[2]);
43 return 1;
44 }
45 while (1) {
46 i = fread (buf1, sizeof (float), 512, f1);
47 j = fread (buf2, sizeof (float), 512, f2);
48 if ((i < 512) || (j < 512))
49 break;
50 for (i = 0; i < 512; i++) {
51 double delta;
52
53 delta = buf2[i] - buf1[i];
54 err += delta;
55 square += delta * delta;
56 if (delta > max)
57 max = delta;
58 if (-delta > max)
59 max = -delta;
60 }
61 total += 512;
62 }
63 if (i == j) {
64 err /= total;
65 square = (square / total) - (err * err);
66 if (square > 0)
67 square = 32768 * sqrt (square);
68 err *= 32768;
69 max *= 32768;
70 printf ("max error %f mean error %f standard deviation %f\n",
71 max, err, square);
72 return ((max > 0.01) || (err > 0.001) || (square > 0.001));
73 }
74 if (i < j)
75 printf ("%s is too short\n", argv[1]);
76 else
77 printf ("%s is too short\n", argv[2]);
78 return 1;
79 }
80