mirrors/lib_um_crypto_rust
1
0
Fork 0
mirror of https://git.um-react.app/um/lib_um_crypto_rust.git synced 2026-03-08 04:29:54 +00:00
Code Issues Packages Projects Releases Wiki Activity
Files
f503b5ea4be7d16176df8dfacaacd5b2e29bbb9a
lib_um_crypto_rust/um_crypto/ncm/Readme.MD
鲁树人 493ed8bdb5 feat: basic ncm support
2024-09-14 14:56:39 +01:00

474 B
Raw Blame History

NCM Decoder

Glossary

  • LV: Length-Value Encoding, length is u32 in Little-Endian.

File Format

  • Magic: CTENFDAM
  • NCM Version: 01 (u8)
  • App version: ?? (u8)
  • ContentKey (LV)
  • Metadata (LV)
  • CRC32 (of all previous data)
  • Cover Block
  • Encrypted Audio

Cover Block

  • Length: u32: frame_len = len(image1 + image2)
  • Length: u32: img1_len = len(image1)
  • Data: u8[img1_len]: image1
  • Data: u8[frame_len - img1_len]: image2 - unknown format
Reference in New Issue View Git Blame Copy Permalink