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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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}
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