OBD:SNDD

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.dat

There are 2 different formats used by the SNDD files.

PC retail

Below is the .dat file part used in the PC retail version.

Offset	Type	Raw Hex	Value	Description
0x00	res_id	01 D7 08 00	2263	02263-comguy_dth2.aif.SNDD
0x04	lev_id	01 00 00 06	3	level 3
0x08	int32	08 00 00 00	8	flags 1 - 2 - 4 - 8 - ADPCM compressed
0x0C	block[50]			wav header
0x3E	int16	37 00	55	duration in 1/60 seconds
0x40	int32	56 28 00 00	10326	size of the part in the raw file in bytes
0x44	offset	20 10 59 00	00 59 10 20	at this position starts the part in the raw file
0x48	char[24]	AD DE	dead	unused

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PC demo and Mac

The Mac version and the PC demo version use a simpler format. It appears that there is no support for different sample rates (all sounds are sampled at 22050 Hz).

Offset	Type	Raw Hex	Value	Description
0x00	res_id	01 D6 08 00	2262	02262-comguy_dth2.aif.SNDD
0x04	lev_id	01 00 00 06	3	level 3
0x08	int32	01 00 00 00	1	"number of channels" (can be 1 for 1 channel or 3 for 2 channels)
0x0C	int32	37 00 00 00	55	duration in 1/60 seconds
0x10	int32	5E 2A 00 00	10846	size of the part in the raw file in bytes
0x14	offset	00 B1 01 00	00 01 B1 00	at this position starts the part in the raw file
0x18	char[8]	AD DE	dead	unused

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raw

The raw data part of a SNDD file contains the actual audio samples without any other headers.

export and import

To create a wav/aif file one needs to write a file header like below and then write the contents of the raw data part.

WAV files

• Write "RIFF"
• add the size of the part in the raw file + 70 bytes
• write "WAVE"
• write "fmt "
• write 50
• write the wav header
• write "data"
• add the size of the part in the raw file
• add the raw file data
• save it as a wav file.

Offset	Type	Raw Hex	Value	Description
Complete ADPCM wav format header (black outline)
0x00	char[4]	52 49 46 46	RIFF	identifier for the "IBM/Microsoft RIFF" standard
0x04	int32	9C 28 00 00	10396	size of the file from 0x08 to the end (= size of the .raw part + 70 bytes)
0x08	char[4]	57 41 56 45	WAVE	identifier for the "WAVE" format
0x0C	char[4]	66 6D 74 20	fmt	identifier announcing the following wav format header
0x10	int32	32 00 00 00	50	wave format header size
0x14	block[50]			wav header
0x46	char[4]	64 61 74 61	data	identifier announcing the following wav data
0x4A	int32	56 28 00 00	10326	size of the following wav data in bytes (= size of the .raw part)

---

AIF files

• Write "FORM"
• add the size of the part in the raw file + 50 bytes
• write "AIFC"
• write "COMM "
• add the aif header + calculate its sample rate (always 22)
• write "SSND"
• add the size of the part in the raw file + 8 bytes
• add 8 zero bytes
• add the raw file data and save it as an aif file.

Note the Big Endian order

Offset	Type	Raw Hex	Value	Description
Complete aif format header (black outline)
0x00	char[4]	46 4F 52 4D	FORM	identifier for the "EA IFF 85" standard
0x04	int32	00 00 2A 90	10896	size of the file from 0x08 to the end (= size of the .raw part + 50 bytes)
0x08	char[4]	41 49 46 43	AIFC	identifier for the "AIFC" format (compressed aif file)
0x0C	char[4]	43 4F 4D 4D	COMM	identifier announcing the following aif format header
0x10	block[26]			aif header
0x2A	char[4]	53 53 4E 44	SSND	identifier announcing the following aif data
0x2E	int32	00 00 2A 66	10854	size of the file from 0x32 to the end (= size of the .raw part + 8 bytes)
0x32	int32	00 00 00 00	0	offset; determines where the first sample in the data starts; in Oni it's always zero
0x36	int32	00 00 00 00	0	block size; used in conjunction with offset for block-aligning data; in Oni it's always zero

ONI BINARY DATA
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SNDD : Sound Data
Generic file