Struct cros_codecs::decoders::vp8::bool_decoder::BoolDecoder

pub struct BoolDecoder<T> {
    data: Cursor<T>,
    range: usize,
    value: usize,
    count: isize,
}

The decoder state.

Fields

data: Cursor<T>

range: usize

value: usize

count: isize

Implementations

impl<T: AsRef<[u8]>> BoolDecoder<T>

pub fn new(data: T) -> Self

Creates a new instance.

fn fill(&mut self) -> Result<()>

Fills more bits from data to value. We shall keep at least 8 bits of the current data in value.

fn read_bit(&mut self, probability: u8) -> Result<bool>

Reads the next bit from the coded stream. The probability of the bit to be one is probability / 256.

fn read_literal(&mut self, nbits: usize) -> Result<i32>

Reads a “literal”, that is, a “num_bits”-wide unsigned value whose bits come high- to low-order, with each bit encoded at probability 1/2.

pub fn read_bool(&mut self) -> Result<bool>

Reads a boolean from the coded stream. Returns false if it has reached the end of data and failed to read the boolean. The probability of out to be true is probability / 256, e.g., when probability is 0x80, the chance is 1/2 (i.e., 0x80 / 256).

pub fn read_bool_with_prob(&mut self, probability: u8) -> Result<bool>

Reads a boolean from the coded stream. Returns false if it has reached the end of data and failed to read the boolean. The probability of out to be true is probability / 256, e.g., when probability is 0x80, the chance is 1/2 (i.e., 0x80 / 256).

pub fn read_uint<U: TryFrom<i32>>(&mut self, nbits: usize) -> Result<U>

Reads an unsigned literal from the coded stream.

pub fn read_sint<U: TryFrom<i32>>(&mut self, nbits: usize) -> Result<U>

Reads a literal with sign from the coded stream. This is similar to the read_literal(), it first read a “num_bits”-wide unsigned value, and then read an extra bit as the sign of the literal.

pub fn value(&self) -> usize

Returns the current coded value.

pub fn count(&self) -> isize

Returns the number of bytes in the value buffer.

pub fn range(&self) -> usize

Returns the range of the current coded value.

pub fn pos(&self) -> usize

Returns the current bit position.

Trait Implementations

impl<T: Default> Default for BoolDecoder<T>

fn default() -> BoolDecoder<T>

Returns the “default value” for a type.