Struct CabacContext 

pub struct CabacContext {
    pub state: u8,
    pub mps: bool,
}

A single CABAC context model.

Tracks the probability of the MPS (most probable symbol) and adapts after each coded bin using exponential moving average.

Fields

state: u8

Probability of the MPS in fixed-point (6-bit fractional, range [1, 127]).

mps: bool

Most probable symbol (false = 0, true = 1).

Implementations

impl CabacContext

pub fn new() -> Self

Create a new context with equi-probable initial state.

pub fn with_state(init_state: u8, mps: bool) -> Self

Create a context with a biased initial probability.

init_state is in [0, 127], where 0 is strongly biased towards LPS and 127 is strongly biased towards MPS.

pub fn update(&mut self, bin: bool)

Update context after observing a bin value.

Uses a simplified adaptation: if the bin matches MPS, state moves towards 127 (more confident); otherwise, state moves towards 0 (less confident), and MPS may flip.

pub fn mps_probability(&self) -> f64

Return the estimated probability of MPS as a float in (0, 1).

Trait Implementations

impl Clone for CabacContext

fn clone(&self) -> CabacContext

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for CabacContext

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.