let q_add = if q == 0 || self.aic { 0i16 } else { (((q >> 1) - 1) | 1) as i16 };
while idx < 64 {
let code = br.read_cb(rl_cb)?;
let q_add = if q == 0 || self.aic { 0i16 } else { (((q >> 1) - 1) | 1) as i16 };
while idx < 64 {
let code = br.read_cb(rl_cb)?;