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docs: soften HD-DVD changelog to partial support (PGC parse deferred)

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Matthew Jackson
2026-07-09 16:33:40 -07:00
parent b5a5138569
commit 2b74a9b21f
1 changed files with 15 additions and 18 deletions
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CHANGELOG.md
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@@ -4,29 +4,26 @@
### Added
- **AACS 2.1 (FMTS) and HD-DVD are first-class disc formats.** FMTS and HD-DVD
discs are detected, labeled, and scanned as their own formats rather than
misread as plain UHD/Blu-ray. On a 2.1 disc the forensic variant segments are
located from `IndividualSegment.tbl` and the `SegmentKey.tbl` container is
parsed; the bulk of the title decrypts with the unit key as usual, and the
forensic segments (for which no segment-key source exists yet) are skipped as
expected loss, so a 2.1 disc rips mostly-complete instead of failing outright.
- **AACS 2.1 (FMTS) is a first-class disc format.** FMTS discs are detected,
labeled, and scanned as their own format rather than misread as plain UHD. The
forensic variant segments are located from `IndividualSegment.tbl` and the
`SegmentKey.tbl` container is parsed; the bulk of the title decrypts with the
unit key as usual, and the forensic segments (for which no segment-key source
exists yet) are skipped as expected loss, so a 2.1 disc rips mostly-complete
instead of failing outright.
- **AACS 2.1 variant Media Key chain runs end to end.** The variant media key is
derived as a clean Processing-Key to media-key primitive, with the record
layout pinned against reference variant MKBs — the per-slot `C` block from the
`0x0c` cvalue table, the `VARIANTS` table plus trailing nonce at `0x2d`, and
`VKD` at `0x2f` — so a genuine variant MKB resolves through the ladder.
- **HD-DVD titles mux as a pipeline input, including VC-1.** HD-DVD EVO video is
demuxed from the MPEG program stream; VC-1 titles carried on extended stream
id `0xFD` (real selector in the PES `stream_id_extension`) route to their own
track, and the VC-1 access units are reframed so each I-frame keeps its
preceding sequence and entry-point headers.
- **The HD-DVD feature is composed from its VTI clip table.** Standard Content
splits the main feature at the layer break (`FEATURE_1`/`FEATURE_2`,
`feature`/`feature_Divide`); the `HVA*.VTI` clip table is parsed and the parts
concatenated into one title in authored order, so the main title is the whole
movie instead of just part 1. Falls back to one title per clip when the disc
carries no readable navigation.
- **Partial HD-DVD support.** HD-DVD is detected as its own format and its
`HVDVD_TS` `.evo` clips mux through the pipeline: EVO video is demuxed from the
MPEG program stream, including VC-1 titles carried on extended stream id `0xFD`
(real selector in the PES `stream_id_extension`), with the VC-1 access units
reframed so each I-frame keeps its preceding sequence and entry-point headers.
Title composition is heuristic for now (authoritative program-chain parsing is
planned), so a disc that authors two distinct features under the layer-break
naming may present them as one title.
- **Display-order timestamps for program-stream H.264 / VC-1 / HEVC.** A program
stream stamps a PES PTS only once per GOP; the parsers now reconstruct a
display-order PTS per frame from the coded picture type and the sparse anchor