Struct RangeCoder 

pub struct RangeCoder {
    pub range: u32,
    pub code: u32,
}

Simplified range coder (decoder side).

Range coding is a generalisation of arithmetic coding used in many modern codecs (VP8, VP9, AV1, …).

Fields

range: u32

Current range (normalised to [128, 256)).

code: u32

Current code word.

Implementations

impl RangeCoder

pub fn new() -> Self

Creates a new range coder with a full-range initial state.

pub fn normalize(&mut self) -> u32

Normalises the range back into [128, 256) by doubling, returning the number of bits consumed from the bitstream.

pub fn decode_symbol(&mut self, prob: u32) -> bool

Decodes one symbol given a split probability prob ∈ [0, 256).

Returns true for the high partition (code ≥ split), false otherwise.

Trait Implementations

impl Clone for RangeCoder

fn clone(&self) -> RangeCoder

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for RangeCoder

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

Formats the value using the given formatter.