BRSTM file

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BRSTM files store sound data. They're used in Mario Kart Wii and possibly other games.

They contain an header, followed by a HEAD chunk, a ADPC chunk and a DATA chunk. All the data in those files are big-endian, except where mentioned. All the offsets are absolute (from begining of file), except where mentioned. All the sizes are in bytes, except where mentioned.

BRSTM header

The header is 64 bytes long.

Offset Size Description
0x0000 4 "RSTM" (0x5253544D)
0x0004 4 Magic (0xFEFF0100)
0x0008 4 Size of the whole file
0x000C 4 Unknown
0x0010 4 Offset to HEAD chunk
0x0014 4 Size of HEAD chunk
0x0018 4 Offset to ADPC chunk
0x001C 4 Size of ADPC chunk
0x0020 4 Offset to DATA chunk
0x0024 4 Size of DATA chunk
0x0028 24 Unknown/Padding (zero)