Function decode 

pub fn decode(
    data: &[u8],
    width: usize,
    height: usize,
    white_level: u32,
    phase: CfaPhase,
    out: &mut [u16],
    parallel: bool,
) -> Result<()>

Decode a VC-5 bitstream (starting at the “VC-5” signature) into a width x height Bayer mosaic (out, row-major). white_level selects the output bit depth of the inverse-log curve (e.g. 4095 → 12-bit samples).