Support audio edit list restricted according to CMAF

[tobbee]

CMAF supports edit lists for audio, but only for a shift in timeline

Acceptance Criteria:

• livesim2 should be able to interpret the edit list and loop the content properly with a correct shift and no drift

Test content

The CTA-WAVE audio test content, e.g.
https://dash.akamaized.net/WAVE/vectors/releases/1/caac_sets/aac_lc/at1/2023-04-27/stream.mpd
has an edit list in the init segment with information mediaTime=2048 indicating a shift of audio reference time with 2 frames.

The first segment's 93 samples therefore result in a duration of 91 samles. This agree with the
segment start time (PTS) in the MPD.

The relevant values are depicted in the table below (all measured as multiples of 1024, the frame duration). Here tfdt means the baseMediaDecodeTime and PTS is fetched from the MPD while dur is the difference in the MPD.

seqNr	tfdt	PTS	dur	nr samples
1	0	0	91	93
2	93	91	93	93
3	93+93	91+93	93	93

Thus there is a two-sample shift throughout the asset.

Notes

• the loop transition will (as usual) be non-perfect
• the first audio frames (which are not output according to the edit list) may be included at the looping boundary if it makes
  the implementation simpler