Blame test/compare.c

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