24 lines
474 B
Plaintext
24 lines
474 B
Plaintext
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# NCM Decoder
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## Glossary
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- LV: Length-Value Encoding, `length` is u32 in Little-Endian.
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## File Format
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- Magic: `CTENFDAM`
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- NCM Version: `01` (u8)
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- App version: `??` (u8)
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- ContentKey (LV)
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- Metadata (LV)
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- CRC32 (of all previous data)
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- Cover Block
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- Encrypted Audio
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### Cover Block
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- Length: `u32: frame_len = len(image1 + image2)`
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- Length: `u32: img1_len = len(image1)`
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- Data: `u8[img1_len]: image1`
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- Data: `u8[frame_len - img1_len]: image2` - unknown format
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