#! /usr/bin/awk -f

# $Progeny$

BEGIN {
    FS = "\t";
    CURRENTVENDOR = "";
    LASTVENDOR = "Nonexistent Vendor";
}

/^[^\t]/ {
    CURRENTVENDOR = $0;
}

/^\t/ && $3 !~ /(sound|tvcard|video)/ && $4 !~ /(unknown|ignore)/ { 
    if (CURRENTVENDOR != LASTVENDOR) {
        print CURRENTVENDOR;
    }
    print $0;
    LASTVENDOR = CURRENTVENDOR;
}