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//! MPEG_carriage_flags — ISO/IEC 13818-1 §2.6.59, Table 2-88.
//!
//! 2-bit field in the metadata_pointer_descriptor that indicates where
//! the referenced metadata service is carried.
/// MPEG_carriage_flags values (Table 2-88).
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
#[cfg_attr(feature = "serde", derive(serde::Serialize))]
#[non_exhaustive]
pub enum MpegCarriageFlags {
/// 0 — Same transport stream.
SameTs,
/// 1 — Different transport stream.
DifferentTs,
/// 2 — Program stream.
ProgramStream,
/// 3 — None of the above.
None,
}
impl MpegCarriageFlags {
/// Construct from a raw 2-bit value.
#[must_use]
pub fn from_u8(v: u8) -> Self {
match v & 0x03 {
0 => Self::SameTs,
1 => Self::DifferentTs,
2 => Self::ProgramStream,
_ => Self::None,
}
}
/// Return the raw 2-bit value.
#[must_use]
pub fn to_u8(self) -> u8 {
match self {
Self::SameTs => 0,
Self::DifferentTs => 1,
Self::ProgramStream => 2,
Self::None => 3,
}
}
/// Returns a human-readable spec name for this value.
#[must_use]
pub fn name(self) -> &'static str {
match self {
Self::SameTs => "same TS",
Self::DifferentTs => "different TS",
Self::ProgramStream => "program stream",
Self::None => "none",
}
}
}
dvb_common::impl_spec_display!(MpegCarriageFlags);
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn round_trip_values() {
for v in 0u8..=3 {
let cf = MpegCarriageFlags::from_u8(v);
assert_eq!(cf.to_u8(), v, "value {v} round-trip mismatch");
}
}
}