func: static void create_default_qtables(uint8_t *qtables, uint8_t q)
  
  {
  
      int factor = q;
  
      int i;
  
  
  
      factor = av_clip(q, 1, 99);
  
  
  
      if (q < 50)
  
          q = 5000 / factor;
  
      else
  
          q = 200 - factor * 2;
  
  
  
      for (i = 0; i < 128; i++) {
  
          int val = (default_quantizers[i] * q + 50) / 100;
  
  
  
          /* Limit the quantizers to 1 <= q <= 255. */
  
          val = av_clip(val, 1, 255);
  
          qtables[i] = val;
  
      }
  
  }
  