Struct LineHeader 

pub struct LineHeader {
    pub field_parity: bool,
    pub line_offset: u8,
}

The shared first byte of the Teletext / VPS / WSS / CC data fields: a fixed reserved_future_use = 11 prefix, then field_parity and a 5-bit line_offset (ETSI EN 301 775 §4.5.1 et al.).

Fields

field_parity: bool

field_parity (1 bit): 1 = first field of a frame, 0 = second field.

line_offset: u8

line_offset (5 bits): the VBI line, coded per the unit’s line_offset table. Range 0..=31.

Implementations

impl LineHeader

pub fn new(field_parity: bool, line_offset: u8) -> Self

Construct a header from its fields.

pub fn from_byte(byte: u8) -> Self

Decode the header from a single byte. The reserved_future_use prefix bits [7:6] are not validated (decoders ignore RFU); only the typed fields are extracted.

pub fn to_byte(self) -> Result<u8>

Encode the header to its single wire byte: 11 | field_parity | line_offset. Errors if line_offset does not fit in 5 bits.

Trait Implementations

impl Clone for LineHeader

fn clone(&self) -> LineHeader

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for LineHeader

impl Debug for LineHeader

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

Formats the value using the given formatter.

impl Eq for LineHeader

impl Hash for LineHeader

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for LineHeader

fn eq(&self, other: &LineHeader) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl Serialize for LineHeader

Available on crate feature serde only.

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for LineHeader