static ShortIterator decodeOpusStream(S url) throws IOException {
  temp var in = httpInputStream(audioURL);
  temp OpusMachine machine = new(in);
  
  ret new ShortIterator {
    int val = Int.MAX_VALUE;
    
    abstract bool hasNext() {
      if (val == Int.MAX_VALUE)
        val = machine!;
      ret val != Int.MIN_VALUE;
    }
        
    abstract short next() {
      if (!hasNext()) fail("No such element");
      var v = val;
      val = Int.MAX_VALUE;
      ret (short) v;
    }
  };
  
}() {
}