Function quant_band 

pub fn quant_band(
    ctx: &mut BandCtx<'_>,
    x: &mut [f32],
    n: usize,
    b: i32,
    b_blocks: i32,
    lowband: Option<&mut [f32]>,
    lm: i32,
    lowband_out: Option<&mut [f32]>,
    gain: f32,
    fill: u32,
) -> u32