Struct CdfContext 

pub struct CdfContext {
    pub partition: [[u16; 11]; 4],
    pub y_mode: [[u16; 14]; 4],
    pub skip: [[u16; 3]; 3],
    pub mv_joint: [u16; 5],
    pub mv_sign: [[u16; 3]; 2],
    pub mv_class: [[u16; 12]; 2],
    pub dc_sign: [[u16; 3]; 3],
    pub coeff_base: Vec<[u16; 5]>,
    pub coeff_br: Vec<[u16; 4]>,
    pub eob_multi: Vec<Vec<u16>>,
}

Container for all CDF tables used in decoding.

Fields

partition: [[u16; 11]; 4]

Partition CDFs.

y_mode: [[u16; 14]; 4]

Y intra mode CDFs.

skip: [[u16; 3]; 3]

Skip CDFs.

mv_joint: [u16; 5]

MV joint CDF.

mv_sign: [[u16; 3]; 2]

MV sign CDFs (for each component).

mv_class: [[u16; 12]; 2]

MV class CDFs.

dc_sign: [[u16; 3]; 3]

DC sign CDFs.

coeff_base: Vec<[u16; 5]>

Coefficient base CDFs.

coeff_br: Vec<[u16; 4]>

Coefficient base range CDFs.

eob_multi: Vec<Vec<u16>>

EOB multi-symbol CDFs.

Indexed by ctx = tx_size_idx * EOB_PLANE_COUNT + plane (see [EOB_MULTI_TOTAL_CONTEXTS]). Each inner Vec<u16> is a CDF whose length is selected per transform area — _8 (9 entries) for small blocks (area ≤ 64) and _16 (17 entries) for larger blocks.

Implementations

impl CdfContext

pub fn new() -> Self

Create a new CDF context with default values.

pub fn reset(&mut self)

Reset all CDFs to default values.

pub fn get_partition_cdf(&self, ctx: usize) -> &[u16; 11]

Get partition CDF for a context.

pub fn get_partition_cdf_mut(&mut self, ctx: usize) -> &mut [u16; 11]

Get mutable partition CDF for a context.

pub fn get_y_mode_cdf(&self, ctx: usize) -> &[u16; 14]

Get Y mode CDF for a context.

pub fn get_skip_cdf(&self, ctx: usize) -> &[u16; 3]

Get skip CDF for a context.

pub fn get_eob_multi_cdf(&self, ctx: usize) -> &[u16]

Get EOB multi CDF for a context.

The context is tx_size_idx * EOB_PLANE_COUNT + plane. Indices that fall outside [EOB_MULTI_TOTAL_CONTEXTS] are clamped to the final slot, which holds the largest-area default CDF (see [default_eob_multi_for_tx_size_idx]).

pub fn get_coeff_base_cdf(&self, ctx: usize) -> &[u16]

Get coefficient base CDF for a context.

pub fn get_coeff_base_eob_cdf(&self, ctx: usize) -> &[u16]

Get coefficient base EOB CDF for a context.

pub fn get_coeff_br_cdf(&self, ctx: usize) -> &[u16]

Get coefficient BR (base range) CDF for a context.

pub fn get_dc_sign_cdf(&self, ctx: usize) -> &[u16]

Get DC sign CDF for a context.

pub fn get_eob_multi_cdf_mut(&mut self, ctx: usize) -> &mut [u16]

Get mutable EOB multi CDF for a context.

Mirrors Self::get_eob_multi_cdf but yields a mutable slice so the arithmetic coder can adapt the CDF after each symbol. Returns a slice into the largest-area slot when ctx is out of range.

pub fn get_coeff_base_cdf_mut(&mut self, ctx: usize) -> &mut [u16]

Get mutable coefficient base CDF for a context.

pub fn get_coeff_base_eob_cdf_mut(&mut self, ctx: usize) -> &mut [u16]

Get mutable coefficient base EOB CDF for a context.

pub fn get_coeff_br_cdf_mut(&mut self, ctx: usize) -> &mut [u16]

Get mutable coefficient BR (base range) CDF for a context.

pub fn get_dc_sign_cdf_mut(&mut self, ctx: usize) -> &mut [u16]

Get mutable DC sign CDF for a context.

Trait Implementations

impl Clone for CdfContext

fn clone(&self) -> CdfContext

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CdfContext

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

Formats the value using the given formatter.

impl Default for CdfContext

fn default() -> Self

Returns the “default value” for a type.