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TrueHD: resync forward to next major sync on a source discontinuity

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MLP/TrueHD carries predictor + restart state across access units, so after a source transport-stream discontinuity (continuity-counter gap) the parser was splicing post-gap audio mid-stream, decoding against stale state and producing a decoder-choking seam (a burst of "restart header sync incorrect" / "Invalid blocksize" errors that could flag the whole track corrupt).

Honor the source's own gap signal: drop forward to the next CRC-valid major-sync AU (a clean re-init point) before resuming, guarded so it never arms before a validated baseline exists (no stream-head whole-track drop). Mirrors the video keyframe resync and the ResyncGate design. Corrects the "audio has no inter-frame refs" comments in truehd/dts/resync. Adds a regression test.
This commit is contained in:
Matthew Jackson
2026-08-23 16:30:29 -07:00
parent 7c085db133
commit e98e98c8fd
4 changed files with 122 additions and 5 deletions
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CHANGELOG.md
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# Changelog
## [1.6.10] — 2026-08-23
### Fixed
- TrueHD/MLP audio: on a source transport-stream discontinuity (lost or gapped
packets, signalled by a continuity-counter break), the parser now drops forward
to the next major-sync access unit before resuming, instead of splicing the
post-gap audio mid-stream. MLP carries predictor + restart state across access
units, so resuming mid-stream decoded against stale state and produced a
decoder-choking seam — streaming decoders emitted a burst of "restart header
sync incorrect" / "Invalid blocksize" errors and could flag the whole track
corrupt. This mirrors the video path (resync to the next keyframe after a gap)
and how the independent-frame audio codecs (AC-3, DTS, FLAC, AAC) already
recover; the fix is guarded so it never arms before a validated major-sync
baseline exists (no whole-track drop at stream head). The gapped instant itself
is in the source and cannot be recovered, but the muxed track is now
decoder-clean.
## [1.6.9] — 2026-08-22
### Changed