for(){
    if(){
        switch(){

to
switch(){
    for(){
        if(){

this halfs the number of times the switch is executed in bidir blocks, in 
other blocks the number is the same


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@9860 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b