OBD:SNDD/wav

Wav Header          Aif Header

Oni PC sound data uses an ADPCMWAVEFORMAT header.

Offset	Type	Raw Hex	Value	Description
0x0C	int16	02 00	2	format ID (2 = ADPCM format)
0x0E	int16	01 00	1	number of channels (1 = mono)
0x10	int32	22 56 00 00	22050	samples per seconds; (also known as "frequency" or "sample rate")
0x14	int32	93 2B 00 00	11155	File:Sndd hd1.gif
0x18	int16	00 02	512	block alignment; used for buffer estimation; (the block alignment of 22050 samples per second is always 512 bytes)
0x1A	int16	04 00	4	bits per sample
Special extended ADPCM wav format header (black outline)
0x1C	int16	20 00	32	size of the following extended information part in bytes
0x1E	int16	F4 03	1012	File:Sndd hd2.gif N.B. For stereo, the -7 in the numerator is replaced with a -14. geyser (talk)
0x20	int16	07 00	7	number of the following coefficient sets
0x22	int16-16	00 01 00 00	256, 0	File:Sndd hd3.gif The 14 coefficients are standard and are used by the wave to play. The seven coefficient sets are preset. They must appear in this order.
0x26	int16-16	00 02 00 FF	512, -256
0x2A	int16-16	00 00 00 00	0, 0
0x2E	int16-16	C0 00 40 00	192, 64
0x32	int16-16	F0 00 00 00	240, 0
0x36	int16-16	CC 01 30 FF	460, -208
0x3A	int16-16	88 01 18 FF	392, -232

Below are the three types of headers occurring in Oni

---

22.05 kHz mono

• 1 channel
• sample rate 22050 Hz
• average rate 11155, truncated from ~11155.7312253 = 22050*512/1012
• block alignment 512
• 4 bits per sample
• 1012 samples per block = 2 + (512 - 7)*8/4/1
• standard coefficient table

0x00:	°°	°°	°°	°°	°°	°°	°°	°°	08	00	00	00	02	00	01	00	°°°°°°°°°°°°°°°°
0x10:	22	56	00	00	93	2B	00	00	00	02	04	00	20	00	F4	03	°°°°°°°°°°°°°°°°
0x20:	07	00	00	01	00	00	00	02	00	FF	00	00	00	00	C0	00	°°°°°°°°°°°°°°°°
0x30:	40	00	F0	00	00	00	CC	01	30	FF	88	01	18	FF	°°	°°	°°°°°°°°°°°°°°°°

---

22.05 kHz stereo

• 2 cnannels
• sample rate 22050 Hz
• average rate 22311, truncated from ~22311.4624506 = 22050*1024/1012
• block alignment 1024
• 4 bits per sample
• 1012 samples per block = 2 + (1024 - 2*7)*8/4/2
• standard coefficient table

0x00:	°°	°°	°°	°°	°°	°°	°°	°°	08	00	00	00	02	00	02	00	°°°°°°°°°°°°°°°°
0x10:	22	56	00	00	27	57	00	00	00	04	04	00	20	00	F4	03	°°°°°°°°°°°°°°°°
0x20:	07	00	00	01	00	00	00	02	00	FF	00	00	00	00	C0	00	°°°°°°°°°°°°°°°°
0x30:	40	00	F0	00	00	00	CC	01	30	FF	88	01	18	FF	°°	°°	°°°°°°°°°°°°°°°°

---

44 kHz mono

• 1 channel
• sample rate 44100 kHz
• average rate 22179, truncated from ~22179.9607073 = 44100*1024/2036
• block alignment 1024
• 4 bits per sample
• 2036 samples per block = 2 + (1024 - 7)*8/4
• standard coefficient table

0x00:	°°	°°	°°	°°	°°	°°	°°	°°	08	00	00	00	02	00	01	00	°°°°°°°°°°°°°°°°
0x10:	44	AC	00	00	A3	56	00	00	00	04	04	00	20	00	F4	07	°°°°°°°°°°°°°°°°
0x20:	07	00	00	01	00	00	00	02	00	FF	00	00	00	00	C0	00	°°°°°°°°°°°°°°°°
0x30:	40	00	F0	00	00	00	CC	01	30	FF	88	01	18	FF	°°	°°	°°°°°°°°°°°°°°°°

List of the (relatively rare) 44 kHz sounds and their OSBDs (without the .aif suffix):

• SNDDap_hit_shld (1 sound, referenced in OSBDap_hit_shld.grp, present in level0)
• SNDDzap01 to SNDDzap45 (45 sounds, OSBDelec_detail.grp, in level9 and level10)
• SNDDzap03, SNDDzap04, SNDDzap07, SNDDzap20, SNDDzap26, SNDDzap32 and SNDDzap40

  (7 sounds, OSBDelecfire_detail.grp, in level3, level4, level6, level8, level9, level10 and level18)

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