dvb-conformance

ETSI TR 101 290 v1.4.1 transport-stream conformance monitor (DVB measurement guidelines). Feed TS packets with a caller-supplied monotonic clock, drain structured conformance events per indicator.

Quick start

use dvb_conformance::{ConformanceMonitor, ConformanceEvent, Indicator};
use core::time::Duration;

let mut monitor = ConformanceMonitor::new();  // default config

let mut t = Duration::ZERO;
for packet in ts_packets {
    t += Duration::from_micros(188 * 8 * 1_000_000 / 6_000_000); // ≈188 bytes @ 6 Mbit/s
    for event in monitor.feed(packet, t) {
        eprintln!("[{:?}] {}: {}", event.priority, event.indicator.name(), event.detail);
    }
}

Use ConformanceMonitor::with_config(Config { .. }) to tune thresholds (PAT/PMT max intervals, PCR repetition and discontinuity limits, SI repetition intervals, etc.).

What's implemented

Indicators — 13 implemented, per the `Indicator` enum in `src/lib.rs`

Priority	Clause	Indicator	Notes
1	1.1	`TsSyncLoss`	Hysteresis: 5 consecutive good → in-sync; 2 consecutive bad → sync lost
1	1.2	`SyncByteError`	`sync_byte != 0x47` on any packet
1	1.3.a	`PatError2`	PAT absent > 500 ms (default); wrong table_id or scrambled on PID 0x0000
1	1.4	`ContinuityCountError`	CC wrap + duplicate-packet allowance (one dup per sequence)
1	1.5.a	`PmtError2`	PMT absent > 500 ms per `program_map_PID`; scrambled on PMT PID
1	1.6	`PidError`	Referenced ES PID absent > 5 s (default)
2	2.1	`TransportError`	`transport_error_indicator` set
2	2.2	`CrcError`	CRC-32 mismatch on completed long-form SI/PSI section
2	2.3a	`PcrRepetitionError`	PCR interval > 100 ms (default) on any PCR-carrying PID
2	2.3b	`PcrDiscontinuityError`	PCR delta > 100 ms (default) without `discontinuity_indicator`
2	2.5	`PtsError`	PTS interval > 700 ms (default) on ES PIDs
2	2.6	`CatError`	Wrong table_id on PID 0x0001; scrambled packet with no CAT seen
3	3.2	`SiRepetitionError`	Max-interval dimension: NIT_actual (10 s), SDT_actual (2 s), EIT P/F actual (2 s), TDT (30 s)

Intentionally excluded:

Clause	Indicator	Reason
2.4	`PCR_accuracy_error`	Requires hardware arrival timestamps — not computable under the caller-supplied-time model
3.2	SI_repetition_error (25 ms min gap)	Deferred — needs per-`(table_id, section_number)` tracking to avoid false positives on dense multi-section tables
3.1 / 3.3–3.10	—	Out of scope

Caller-supplied time model

ConformanceMonitor::feed(packet, t) takes a core::time::Duration alongside each TS packet. The monitor uses this clock for all presence/absence timeout checks (1.3.a, 1.5.a, 1.6, 2.3a, 2.3b, 2.5, 3.2). The caller must supply monotonic non-decreasing timestamps; the monitor does not enforce this but non-monotonic timestamps will produce spurious events. Because there is no independent hardware clock, PCR accuracy (2.4) and buffer-model indicators are not computable.

SI_repetition_error (3.2) — implementation notes

Maximum-interval checks are implemented for NIT_actual (10 s), SDT_actual (2 s), EIT P/F actual (2 s), and TDT (30 s). Each table's timer is lazily armed — checking starts only after the first section of that table is seen; an entirely absent table is not flagged by this indicator (that is the role of the out-of-scope per-table presence indicators).
EIT P/F is tracked at the table level (any section with table_id 0x4E resets the timer), not per section_number, to avoid false positives on dense EIT schedules.

PAT-following PMT discovery

The monitor parses each completed PAT section and automatically starts tracking the program_map_PID entries it finds, enabling indicator 1.5.a (PMT absence) and ES PID extraction (indicator 1.6).

Feature flags

Feature	Default	Description
`std`	on	Link the standard library. Without it the crate is `#![no_std]` + `alloc`.
`serde`	on	Serialize-only (`serde::Serialize`) on `ConformanceEvent`, `Indicator`, `Priority`, `Stats`.

MSRV

Rust 1.81.

References

ETSI TR 101 290 v1.4.1 (2023-05) — DVB Measurement Guidelines (§5.2.1 Table 5.0a, §5.2.2 Table 5.0b, §5.2.3 Table 5.0c)
ISO/IEC 13818-1 — MPEG-2 Systems

License

Licensed under either of MIT (LICENSE-MIT) or Apache-2.0 (LICENSE-APACHE), at your option.

dvb-conformance 7.0.0