BRS (File Format)

BRS (Binary Remix Sequence) files contain sequence data for the NoteFairy (Rainbow Notes) object. Super Mario Galaxy and Super Mario Galaxy 2 each contain only one BRS file, located in AudioRes/Info/JaiRemixSeq.arc/brs/defaultremixseq.brs.

Header

The BRS format contains no header magic like most files do. Instead, it consists of a Sequence Count and Pointers. The size of the header is 0x4 + (Sequence Count x 0x4):

Offset	Type	Description
0x00	UInt32 (0x4)	Sequence Count

Offsets

Each pointer holds the offset of a Sequence relative to the beginning of the file and is formatted like this:

Offset	Type	Description
0x00	UInt32 (0x4)	Offset

Sequence Header

Each sequence's header consists of a Track and Note Count:

Offset	Type	Description
0x00	UInt32 (0x4)	Track Count
0x04	UInt32 (0x4)	Note Count

Note Duration (?)

The header is followed by a section that (presumably) defines the duration of each Note. This section's size is Note Count x 0x4.

Offset	Type	Description
0x00	UInt32 (0x4)	Note Duration (?)

Track

Each Track starts by defining its instrument (0x4), followed by the individual Key-presses for a Note (0x10 each). There is no padding between Tracks.

Instrument

Offset	Type	Description
0x00	??? (0x2)	Likely unused
0x02	UInt8 (0x1)	Set Bank
0x03	UInt8 (0x1)	Set Prog

Key

Offset	Type	Description
0x00	UInt32 (0x4)	Key (0x00 = C-1, 0x60 = C4 (middle C), 0x7F = G9, FFFFFFFF = None)
0x04	UInt32 (0x4)	Velocity
0x08	UInt32 (0x4)	Duration
0x0C	UInt32 (0x4)	Delay

Sequences in SMG & SMG2

A sequence can be defined in Obj_arg4 for the NoteFairy object. The following sequences are available in both games:

Obj_arg4	Name	Note Count	Notes
0	Super Mario Bros. main theme (long)	13	Unused
1	Super Mario Bros. main theme (short)	7	Unused
2	Super Mario Bros. underground theme	43
3	Super Mario Bros. main theme (short)	7	Unused
4	Super Mario Bros. underwater theme	46
5	Super Mario World bonus room theme	64