#!/bin/sh

[ $# -eq 2 -o $# -eq 3 ] || { echo "Syntax: ofdmtv-decode.sh <output dir> <input file> [<max fragments>]"; exit 1; }

outdir=$1
infile=$2
fragments=1000
[ $# -eq 3 ] && fragments=$3

tmpdir=$(mktemp -d)
trap "rm -rf $tmpdir" exit

mkdir -p $outdir
fragment_list=
for fragment in $(seq 0 $fragments); do
    ofdmtv-modem-decode $tmpdir/$fragment.crs $infile $fragment > /dev/null 2>&1
    md5sum $tmpdir/$fragment.crs
    fragment_list="$fragment_list $tmpdir/$fragment.crs"
done

touch $tmpdir/md5
for fragment in $(seq 0 $fragments); do
    file=$outdir/$fragment.jpg
    ofdmtv-crs-decode $file $fragment_list > /dev/null 2>&1
    fragment_list=$(echo $fragment_list | sed 's/[^ ]* //')

    if [ -f $file ]; then
        if [ -s $file ]; then
            md5=$(md5sum < $file | cut -b -32)
            if grep ^$md5 $tmpdir/md5 > /dev/null; then
                rm -f $file
            else
                ls -l $file
                echo $md5 $file >> $tmpdir/md5
            fi
        else
            rm -f $file
        fi
    fi
done