bash/wodim based multi burner

#!/bin/bash
if test -z $1
then
    echo "Usage: $0 <iso/wav/mp3>"
    exit 1
else
    if ! test -e $1
    then
        echo "$1 does not exist."
        exit 1
    fi
fi

FILETYPE=`file --mime-type $1|awk {'print $2'}`
case "$FILETYPE" in
audio/x-wav)
    OPT="-text -dao -pad $1"
    ;;
audio/mpeg)
    mpg123 -q $1 -w $1.wav
    OPT="-text -dao -pad $1.wav"
    ;;
application/octet-stream)
    OPT="-data $1"
    ;;
*)
    echo "Unknown filetype: $FILETYPE"
    exit 1
    ;;
esac

while :
do
    for dev in /dev/sr*
    do
        if ! ps xfau|grep wodim|grep $dev > /dev/null
        then
            if wodim -V -inq dev=$dev 2>&1 | grep "medium not present" > /dev/null
            then
                continue
            else
                sudo wodim dev=$dev -v -eject -timeout 40 -overburn fs=32M -dao $OPT &
            fi
        fi
    done
    sleep 10
done