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//! Content_time_base_indicator — ISO/IEC 13818-1 §2.6.57, Table 2-85.
//!
//! 4-bit field in the content_labeling_descriptor that selects the
//! time-base semantics for the associated content.
/// Content_time_base_indicator values (Table 2-85).
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
#[cfg_attr(feature = "serde", derive(serde::Serialize))]
#[non_exhaustive]
pub enum ContentTimeBaseIndicator {
/// 0 — No content time base defined in this descriptor.
None,
/// 1 — STC (System Time Clock).
Stc,
/// 2 — NPT (Normal Play Time).
Npt,
/// 3–7 — Reserved.
Reserved(u8),
/// 8–15 — Privately defined.
Private(u8),
}
impl ContentTimeBaseIndicator {
/// Construct from a raw 4-bit nibble.
#[must_use]
pub fn from_u8(v: u8) -> Self {
match v {
0 => Self::None,
1 => Self::Stc,
2 => Self::Npt,
3..=7 => Self::Reserved(v),
v => Self::Private(v),
}
}
/// Return the raw 4-bit value.
#[must_use]
pub fn to_u8(self) -> u8 {
match self {
Self::None => 0,
Self::Stc => 1,
Self::Npt => 2,
Self::Reserved(v) | Self::Private(v) => v,
}
}
/// Returns a human-readable spec name for this value.
#[must_use]
pub fn name(self) -> &'static str {
match self {
Self::None => "none",
Self::Stc => "STC",
Self::Npt => "NPT",
Self::Reserved(_) => "reserved",
Self::Private(_) => "private",
}
}
}
dvb_common::impl_spec_display!(ContentTimeBaseIndicator, Reserved, Private);
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn round_trip_values() {
for v in 0u8..=15 {
let indicator = ContentTimeBaseIndicator::from_u8(v);
assert_eq!(indicator.to_u8(), v, "value {v} round-trip mismatch");
}
}
}