libfreemkv

Rust library for 4K UHD / Blu-ray optical drives. Drive access, disc scanning, stream labels, AACS decryption, KEYDB updates, and content reading in one crate. Bundled drive profiles — no external files needed.

12-23 MB/s read speeds on BD. Full LibreDrive init: unlock, firmware upload, speed calibration — all from pure Rust.

Multi-lingual by design — the library outputs structured data and numeric error codes, never English text. Build any UI or localization on top.

API Documentation · Technical Docs

Part of the freemkv project.

Install

[dependencies]
libfreemkv = "0.5"

Quick Start

use libfreemkv::{DriveSession, Disc, ScanOptions};
use std::path::Path;

// Open drive — profiles are bundled, auto-identified
let mut session = DriveSession::open(Path::new("/dev/sr0"))?;

// Scan disc — UDF, playlists, streams, AACS (all automatic)
let disc = Disc::scan(&mut session, &ScanOptions::default())?;

for title in &disc.titles {
    println!("{} — {} streams", title.duration_display(), title.streams.len());
}

// Read content (decrypted transparently if AACS keys available)
let mut reader = disc.open_title(&mut session, 0)?;
while let Some(unit) = reader.read_unit()? {
    // 6144 bytes of content per aligned unit
}

What It Does

• Drive access — open, identify, unlock, firmware upload, speed calibration, eject
• 12-23 MB/s reads — auto-detects kernel transfer limits, full disc speed
• Disc scanning — UDF 2.50 filesystem, MPLS playlists, CLPI clip info
• Stream labels — 5 BD-J format parsers (Paramount, Criterion, Pixelogic, CTRM, Deluxe)
• AACS decryption — transparent key resolution and content decrypt (1.0, 2.0 in progress)
• KEYDB updates — download, verify, save from any HTTP URL (zero deps, raw TCP)
• Content reading — adaptive batch reads with automatic decryption and error recovery

AACS decryption requires a KEYDB.cfg file. If available at ~/.config/aacs/KEYDB.cfg or passed via ScanOptions, the library handles everything — handshake, key derivation, and per-sector decryption — without the application needing to know anything about encryption.

Architecture

DriveSession           — open, identify, unlock, read sectors
  ├── ScsiTransport    — SG_IO (Linux), IOKit (macOS)
  ├── DriveProfile     — per-drive unlock parameters (bundled)
  └── Platform         — MediaTek (supported), Renesas (planned)

Disc                   — scan titles, streams, AACS state
  ├── UDF reader       — Blu-ray UDF 2.50 with metadata partitions
  ├── MPLS parser      — playlists → titles + clips + streams
  ├── CLPI parser      — clip info → EP map → sector extents
  ├── Labels           — 5 BD-J format parsers (detect + parse)
  ├── AACS             — key resolution + content decryption
  └── KEYDB            — download + verify + save

See docs/ for detailed technical documentation on each module.

Error Codes

All errors are structured with numeric codes. No user-facing English text — applications format their own messages.

Range	Category
E1xxx	Device errors (not found, permission)
E2xxx	Profile errors (unsupported drive)
E3xxx	Unlock errors (failed, signature)
E4xxx	SCSI errors (command failed, timeout)
E5xxx	I/O errors
E6xxx	Disc format errors
E7xxx	AACS errors
E8xxx	KEYDB update errors

Platform Support

Platform	Status	Backend
Linux	Supported	SG_IO ioctl
macOS	Supported	IOKit SCSITask
Windows	Planned	SPTI

Contributing

Run freemkv info --share with the freemkv CLI to contribute your drive's profile.

License

AGPL-3.0-only