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v0.27.0: detect AACS-scrambled units by raw TS sync, not flag bits

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Rename is_unit_encrypted -> is_aacs_scrambled and decide encryption from the unit's MPEG-TS sync bytes (destroyed by the encrypted body) instead of the TP_extra copy-control (byte 0) or TS scrambling-control (byte 7) flags, which discs do not set reliably. One shared predicate now backs the decrypt gate and out-of-band key validation, so callers agree on what 'encrypted' means. Decryption restores the syncs, so a decrypted unit reads as clear and there is no flag to clear.
This commit is contained in:
MattJackson
2026-06-03 07:35:50 -07:00
parent c8eb42b490
commit b518860d9c
8 changed files with 138 additions and 132 deletions
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CHANGELOG.md
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# Changelog
## 0.27.0 (2026-06-03)
### Changed
- **AACS unit-encryption detection now reads the raw MPEG-TS sync bytes
instead of header flag bits.** `is_unit_encrypted` is renamed
`is_aacs_scrambled`: a unit is encrypted iff its body TS packet sync bytes
(`0x47` at offset 4 and every 192 bytes) are not intact — the encrypted
body destroys them. The previous check read the TP_extra copy-control bits
(byte 0) or TS transport_scrambling_control bits (byte 7), which discs and
players do not set reliably. A single predicate now backs both the decrypt
gate and out-of-band key validation, so all callers agree on what
"encrypted" means. Decryption restores the syncs, so a decrypted unit reads
as clear and there is no encryption flag to clear.
## 0.26.1 (2026-05-22)
### Added