Module live_edge 

Live edge, presentation delay and join (ISO/IEC 23009-1 5.3.9.5.3, A.2 step 4; DASH-IF IOP v4.3 4.3.3.2.2 and 4.3.4).

• D = @suggestedPresentationDelay when present, else max(4 s, 3 x maxSegmentDuration) (IOP 4.3.3.2.2: 2-4 segment durations and not under 4 s), clamped to TSB - 2 x maxSegmentDuration when a time-shift buffer exists; an explicit override replaces it.
• Join time (Period-relative) T_join = utc_now - D - (AST + PeriodStart); the segment joined is the one containing it on the Representation’s own timeline (audio and video boundaries differ), clamped to the segments that are complete and still inside the time-shift window.

Structs

LiveWindow

The plan indices of the segments obtainable now.

Constants

DELAY_SEGMENT_MULTIPLE

IOP 4.3.3.2.2: the delay is a small multiple of the segment duration.

MIN_PRESENTATION_DELAY_US

IOP 4.3.3.2.2: the presentation delay is not under four seconds.

TSB_GUARD_SEGMENTS

Segment durations kept free inside the time-shift buffer.

Functions

join_index

The segment to start with: the one containing T_join, clamped into the window. None when nothing is obtainable.

join_time_us

T_join, Period-relative microseconds.

newest_complete

Index of the newest complete segment at utc_now_us; None when none is complete yet or the plan is static.

oldest_in_window

Index of the oldest segment whose availability has not ended at utc_now_us; None when none is complete or all have expired.

presentation_delay_us

The presentation delay D, in microseconds.

window

The obtainable window at utc_now_us.