Function code_brick 

pub fn code_brick<S: Sink>(
    sh: &Shape,
    q: &mut [i32],
    preds: &[[i32; 6]],
    init: &[u32],
    lanes: usize,
    adapt: bool,
    s: &mut S,
)

Code (encode or decode) a brick’s coefficients q; adapt selects per-lane adaptive models (else the priors are static probabilities).