offset.c

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/*
 * This file is part of Titan2Reader
 *
 * Copyright (C) 2006, Sebastien Judenherc <sebastien.judenherc@agecodagis.com>
 *
 * This program 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.
 *
 * This program 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 <stdlib.h>
#include <stdio.h>
#include <time.h>
#include <ctype.h>
#include <math.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <assert.h>
#include <fcntl.h>
#include <dirent.h>

#include "common.h"


unsigned char ProcessOffsetFrame(const unsigned char *frame)
{
        int triplet,i;
        PrintDebug("offset frame !!!\n");
        if (doOffset==0)
        {
                return(0);
        }
        // check for 3 channel data
        if (frame[10]&(1<<4))
        {
                PrintError("OFFSET FRAMES FOR 1-CHANNEL DATA ARE NOT "
                                "SUPPORTED (file: %s) "
                                "contact Agecodagis if this is really an "
                                "offset frame for 1-channel data\n",
                                currentFile);
                return(0);
        }
        // now do the job
        // identify the triplet
        triplet=(frame[9]&0xf0)>>4;
        // sanity check on the triplet
        if ((triplet<0)||(triplet>3))
        {
                PrintError("corrupted offset frame, skipping\n");
                return(0);
        }

        // read the offsets

        // absolute case
        if (frame[10]&(1<<5))
        {
                for (i=0; i<3; i++)
                {
                        HWConfig.absOffset[i]=HWConfig.absOffset[i+6]=frame2i24(frame,i*3);
                }
                PrintDebug("Aoffset (ch%d): %d %d %d\n", triplet,
                                frame2i24(frame,0),
                                frame2i24(frame,3),
                                frame2i24(frame,6));
        }
        else // relative case
        {
                for (i=0; i<3; i++)
                {
                        HWConfig.relOffset[i]=HWConfig.relOffset[i+6]=frame2i24(frame,i*3);
                }
                PrintDebug("Roffset (ch%d): %d %d %d\n", triplet,
                                frame2i24(frame,0),
                                frame2i24(frame,3),
                                frame2i24(frame,6));
        }
        return(0);
}

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