/*
* compare.c
* Copyright (C) 2000-2002 Michel Lespinasse <walken@zoy.org>
* Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
*
* This file is part of a52dec, a free ATSC A-52 stream decoder.
* See http://liba52.sourceforge.net/ for updates.
*
* a52dec is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* a52dec is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdio.h>
#include <math.h>
int main (int argc, char ** argv)
{
FILE * f1;
FILE * f2;
float buf1[512];
float buf2[512];
int i, j;
int total = 0;
double max = 0, err = 0, square = 0;
if (argc != 3)
return 1;
f1 = fopen (argv[1], "rb");
f2 = fopen (argv[2], "rb");
if ((f1 == NULL) || (f2 == NULL)) {
printf ("cannot open file %s\n", (f1 == NULL) ? argv[1] : argv[2]);
return 1;
}
while (1) {
i = fread (buf1, sizeof (float), 512, f1);
j = fread (buf2, sizeof (float), 512, f2);
if ((i < 512) || (j < 512))
break;
for (i = 0; i < 512; i++) {
double delta;
delta = buf2[i] - buf1[i];
err += delta;
square += delta * delta;
if (delta > max)
max = delta;
if (-delta > max)
max = -delta;
}
total += 512;
}
if (i == j) {
err /= total;
square = (square / total) - (err * err);
if (square > 0)
square = 32768 * sqrt (square);
err *= 32768;
max *= 32768;
printf ("max error %f mean error %f standard deviation %f\n",
max, err, square);
return ((max > 0.01) || (err > 0.001) || (square > 0.001));
}
if (i < j)
printf ("%s is too short\n", argv[1]);
else
printf ("%s is too short\n", argv[2]);
return 1;
}