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Kingdom Hearts DS Games - STRM File Format

All information was referenced from this document

STRM stands for “Stream”. It is an individual mono/stereo wave file (PCM8, PCM16 or ADPCM).

File Header

Position Type Name Description
0x0 char[4] type ‘STRM’
0x4 uint32 magic 0x0100feff
0x8 uint32 nFileSize Size of this STRM file
0xC uint16 nSize Size of this structure = 16
0xE uint16 nBlock Number of Blocks = 2

Stream Head

Position Type Name Description
0x0 char[4] type ‘HEAD’
0x4 uint32 nSize Size of this structure
0x8 uint8 nWaveType 0 = PCM8, 1 = PCM16, 2 = (IMA-)ADPCM
0x9 uint8 bLoop Loop flag = TRUE/FALSE
0xA uint8 nChannel Channels
0x10 uint8 unknown always 0
0x11 uint16 nSampleRate Sampling Rate (perhaps resampled from the original)
0x13 uint16 nTime (1.0 / rate * ARM7_CLOCK / 32) [ARM7_CLOCK: 33.513982MHz / 2 = 1.6756991e7]
0x15 uint32 nLoopOffset Loop Offset (samples)
0x19 uint32 nSample Number of Samples
0x1D uint32 nDataOffset Data Offset (always 68h)
0x21 uint32 nBlock Number of Blocks
0x25 uint32 nBlockLen Block Length (Per Channel)
0x29 uint32 nBlockSample Samples Per Block (Per Channel)
0x2D uint32 nLastBlockLen Last Block Length (Per Channel)
0x31 uint32 nLastBlockSample Samples Per Last Block (Per Channel)
0x34 uint8[32] reserved always 0

Stream Data

Position Type Name Description
0x0 char[4] type ‘DATA’
0x4 uint32 nSize Size of this structure
0x8 uint8[1] data Arrays of wave data

Wave Data

A Block is the same as SWAV Wave Data.

Mono (SWAV)

Block 1
Block 2
...
Block N (Last Block)

Stereo (STRM)

Block 1 L
Block 1 R
Block 2 L
Block 2 R
...
Block N L (Last Block)
Block N R (Last Block)