Struct AnsDistribution 

pub struct AnsDistribution {
    pub symbols: Vec<u16>,
    pub frequencies: Vec<u32>,
    pub cumulative: Vec<u32>,
    pub log_table_size: u8,
}

ANS probability distribution table.

Maps symbols to frequency counts. The sum of all frequencies must equal 1 << log_table_size (the table size).

Fields

symbols: Vec<u16>

Symbol values in the distribution.

frequencies: Vec<u32>

Frequency (probability count) for each symbol.

cumulative: Vec<u32>

Cumulative frequency table (prefix sums of frequencies).

log_table_size: u8

Log2 of the total frequency table size.

Implementations

impl AnsDistribution

pub fn new( symbols: Vec<u16>, frequencies: Vec<u32>, log_table_size: u8, ) -> CodecResult<Self>

Create a new distribution from symbol frequencies.

Frequencies are normalized so they sum to 1 << log_table_size.

pub fn table_size(&self) -> u32

Total table size (sum of all frequencies).

pub fn num_symbols(&self) -> usize

Number of symbols in the distribution.

pub fn lookup(&self, value: u32) -> CodecResult<(usize, u32, u32)>

Look up a symbol by its cumulative frequency position.

Trait Implementations

impl Clone for AnsDistribution

fn clone(&self) -> AnsDistribution

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for AnsDistribution

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

Formats the value using the given formatter.