BFSTP (File Format)

BFSTP (Binary caFe STream Prefetch) is a file format used together with BFSTM files on Wii U and the Nintendo Switch. It contains the sound stream which is heard in the beginning, to make sure the BFSTM is loaded smoothly.

File Format

Header

The file starts with a header. It has the following structure:

Offset	Type	Description
0x00	Char[4]	File magic. Always FSTP in ASCII.
0x04	UInt16	Byte-order-mark. FE FF for big endian, FF FE for little endian.
0x06	UInt16	Header size. Always 0x40.
0x08	UInt32	Version number.
0x0C	UInt32	Size of the file in bytes.
0x10	UInt16	Number of data blocks in the file. Always 2 (INFO and PDAT).
0x12	UInt16	Padding.
0x14	UInt16	INFO section flag. Always 0x4000.
0x16	UInt16	Padding.
0x18	Int32	INFO offset.
0x1C	UInt32	INFO size.
0x20	UInt16	PDAT section flag. Always 0x4004.
0x22	UInt16	Padding.
0x24	Int32	PDAT offset.
0x28	UInt32	PDAT size.

INFO

The INFO section contains general information about the stream.

Offset	Type	Description
0x00	Char[4]	Section magic. Always INFO in ASCII.
0x04	UInt32	Size of this section in bytes.
0x08	UInt16	Stream info flag. Always 0x4100.
0x0A	UInt16	Padding.
0x0C	Int32	Stream info offset, relative to 0x08 in this structure.
0x10	UInt16	Track info flag. Often not used and therefor set to 0.
0x12	UInt16	Padding.
0x14	Int32	Track info offset, relative to 0x08 in this structure.
0x18	UInt16	Channel info flag. Always 0x0101.
0x1A	UInt16	Padding.
0x1C	Int32	Channel info offset, relative to 0x08 in this structure.

Stream Info

Offset	Type	Description
0x00	Byte	Sound encoding. 0 = PCM8, 1 = PCM16, 2 = DSP ADPCM, 3 = IMA ADPCM.
0x01	Byte	Loop. 1 if it loops.
0x02	Byte	Number of channels.
0x03	Byte	Number of regions.
0x04	UInt32	Sample rate.
0x08	UInt32	Loop start.
0x0C	UInt32	Loop end.
0x10	UInt32	The total number of blocks, including the padded one. If this field is N, S is the size of one block and P is the size of a last padded block, then the size of one channel is (N - 1) * S + P.
0x14	UInt32	Size of one block in bytes.
0x18	UInt32	Size of one block in samples.
0x1C	UInt32	Size of the last block without padding in bytes.
0x20	UInt32	Size of the last block without padding in samples.
0x24	UInt32	Size of the last block with padding in bytes. The last block is always aligned. PCM8 audio is aligned by 0x20 and PCM16 audio is aligned by 0x04.
0x28	UInt32	Size of one channel's seek info for one block, which should be 4, given the History Info should be 4 bytes long in almost all cases.
0x2C	UInt32	Seek sample interval. Unknown meaning.
0x30	UInt16	Sample data flag. Always 0x1F00.
0x32	UInt16	Padding.
0x34	Int32	Absolute sample data offset. Offset to the sample data of the first channel.
0x38	UInt16	Size of each region info. Unknown meaning.
0x3A	UInt16	Padding.
0x3C	UInt16	Region info flag. Often not used and therefor set to 0.
0x3E	UInt16	Padding.
0x40	Int32	Region info offset.
If version ≥ 0.2.1.0
0x44	UInt32	Original loop start.
0x48	UInt32	Original loop end.
If version ≥ 0.5.1.0
0x4C	UInt32	CRC-32 checksum of the BFSTM file with the checksum field set to 0.

Track Info

The INFO section links to a reference table which points to the following structure:

Offset	Type	Description
0x00	Byte	Volume.
0x01	Byte	Pan.
0x02	Byte	Span.
0x03	Byte	Flags.
0x04	UInt16	Global channel index table flag.
0x06	UInt16	Padding.
0x08	Int32	Offset to the global channel index table.

Global Channel Index Table

The Global Channel Index Table is used to bundle the local channel index in the track with the global channel index for the overall stream. It has the following structure:

Offset	Type	Description
0x00	UInt32	C = Count.
0x04	Byte[C]	Items.

Channel Info

The INFO section links to a reference table which points to the following structure. The section flag is set to 0x4102.

Offset	Type	Description
0x00	UInt16	Section flag. Always 0x0300.
0x02	UInt16	Padding.
0x04	Int32	Offset to DSP ADPCM channel info, relative to the start of this structure.

DSP ADPCM Channel Info

Offset	Type	Description
0x00	UInt16[8][2]	16-bit Coefficients.
0x20	UInt16	Pred scale.
0x22	UInt16	Yn 1.
0x24	UInt16	Yn 2.
0x26	UInt16	Loop Pred Scale.
0x28	UInt16	Loop Yn 1.
0x2A	UInt16	Loop Yn 2.
0x2C	UInt16	Padding.

PDAT

The PDAT (Prefetch DATa) section contains the prefetch data. It has the following structure:

Offset	Type	Description
0x00	Char[4]	Section magic. Always PDAT in ASCII.
0x04	UInt32	Size of this section in bytes.
0x08	Int32	Number of prefetch datas.

The specified number of prefetch datas follows.

Prefetch Data

Offset	Type	Description
0x00	UInt32	Start frame.
0x04	UInt32	Size of prefetch data in bytes.
0x08	UInt32	Reserved.
0x0C	UInt16	Section flag. Always 0.
0x0E	UInt16	Padding.
0x10	Int32	Prefetch data offset, relative to the start of this structure.

Version List

Version	Found in
0.1.0.0	Mario Kart 8
0.2.1.0	1-2-Switch ARMS Super Mario Maker Mario Kart 8 Deluxe Mario Kart 8 Deluxe (S00018080-R00018076-A00000000 Prototype) The Legend of Zelda: Breath of the Wild (Nintendo Switch)
0.4.0.0	Splatoon 2
0.5.1.0	Game Builder Garage Nintendo Labo - Toy-Con 01: Variety Kit Nintendo Labo - Toy-Con 02: Robot Kit Nintendo Labo - Toy-Con 03: Vehicle Kit Nintendo Labo - Toy-Con 04: VR Kit Splatoon 2 Super Mario Odyssey
0.5.2.0	Mario Golf: Super Rush

Tools

The following tools can handle BFSTP files:

• (none)