MusicBee Library

File Format
Name	MusicBee Library
Ontology	Electronic File Formats Audio and Music MusicBee Library
Extension(s)	.mbl

MusicBee is a freeware music player and library manager for Windows written in Visual Basic. The MusicBee Library file keeps track of all the media that MusicBee considers part of a person's collection. This includes all the metadata about each file, so MusicBee does not have to read the actual files every time to get that information.

Format

The format of MusicBee's library starts with the amount of files in the library, encoded as a signed 32-bit integer that has been left-shifted by 8. This is then followed by the blocks that represent each of the files.

Data	Format	Size (in bytes)
File Designation? (if 1, the end of the file has been reached)	byte	1
Status?	byte	1
? (always seems to be 0xFF)	byte	1
Play Count	uint16	2
Date Last Played	int64 (.NET DateTime)	8
Skip Count	uint16	2
File Path	pascal string (length is 7-bit)	variable
File Size (in bytes)	int32	4
Sample Rate	int32	4
Channel Indicator	byte	1
Bitrate Type (CBR, VBR, etc.)	byte	1
Bitrate	int16	2
Track Length (in ms)	int32	4
Date Added	int64 (.NET DateTime)	8
Date Modified	int64 (.NET DateTime)	8

Following this are blocks representing the artwork associated with the file.

Data	Format	Size (in bytes)
Artwork Type (if 0xFE or 0xFF, move on)	byte	1
?	pascal string (length is 7-bit)	variable
Storage Mode	byte	1
?	pascal string (length is 7-bit)	variable

After the artwork we have tags listed with the code for the tag as a byte, followed by a pascal string containing the value of the tag. If the tag code is 0, then you move on to the next file block. If the tag code is 255 however, there are some unknown values pertaining to .cue files that are repeated per the value of an int16.

Data	Format	Size (in bytes)
?	byte	1
?	uint16	2
?	int64	8
?	uint16	2

Links

https://gist.github.com/lempamo/6e8977065da593e372e45d4c628e7fc7 - Proof of Concept .MBL parser in Python