Struct SliceHeaderReader 

pub struct SliceHeaderReader {
    pub log2_max_frame_num: u8,
}

Reads slice header fields from a raw byte buffer.

This is a simplified reader that expects the buffer to begin immediately after the NAL unit start code and header byte. Full Exp-Golomb parsing is approximated with a fixed layout suitable for testing.

Fields

log2_max_frame_num: u8

Log2 of MaxFrameNum (from SPS); used to mask frame_num.

Implementations

impl SliceHeaderReader

pub fn new(log2_max_frame_num: u8) -> Self

Creates a new reader with the given log2_max_frame_num.

pub fn read_type(&self, data: &[u8]) -> Option<SliceType>

Reads the slice type from the first byte of data.

Returns None if data is empty or the value is out of range.

pub fn frame_num(&self, data: &[u8]) -> Option<u16>

Reads the frame_num from bytes 1–2 of data (big-endian u16), masked to (1 << log2_max_frame_num) - 1.

Returns None if data has fewer than 3 bytes.

pub fn parse(&self, nal_ref_idc: u8, data: &[u8]) -> Option<SliceHeader>

Full parse: reads slice type, frame_num, and other fixed fields.

Returns None if data is too short (requires at least 5 bytes).

Trait Implementations

impl Debug for SliceHeaderReader

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

Formats the value using the given formatter.

impl Default for SliceHeaderReader

fn default() -> SliceHeaderReader

Returns the “default value” for a type.