OBD:OSBD/OSAm

Offset	Type	Raw Hex	Value	Description
0x00	int32	6D 41 53 4F	OSAm	Oni Sound Ambient
0x04	int32	C8 00 00 00	200	200 bytes; size of the part that follows
0x08	int32	06 00 00 00	6	version (see below)
0x0c	int32	01 00 00 00	1	priority; the following priorities are possible (values in dec): 0 - low 1 - normal 2 - high 3 - highest
0x10	int32	04 00 00 00	4	sound options: 1 - interrupt tracks on stop 2 - play only once 4 - can pan
0x14	float	00 00 20 41	10.000000	unknown
0x18	float	00 00 80 3F	1.000000	minimum elapsed time in seconds
0x1c	float	00 00 80 3F	1.000000	maximum elapsed time in seconds
0x20	float	00 00 20 41	10.000000	minimum volume distance
0x24	float	00 00 48 42	50.000000	maximum volume distance
0x28	char[32]	00...	not used	detail track name (reference to a .grp.OSBD file)
0x48	char[32]	61 69 72...	aircon5lp	base track 1 name (reference to 06375-aircon5lp.grp.OSBD)
0x68	char[32]	00...	not used	base track 2 name (reference to a .grp.OSBD file)
0x88	char[32]	00...	not used	in sound name (reference to a .grp.OSBD file)
0xa8	char[32]	00...	not used	out sound name (reference to a .grp.OSBD file)
0xc8	int32	03 00 00 00	3	unknown (present in version 5 and above, default is 3)
0xcc	float	00 00 00 00	0.000000	unknown (present in version 6 and above, default is 0.0)

(Possible field names for the "unknown" fields are: sphere radius, min. occlusion and threshold.)

Version

Just as for other OSBD, there have been several version of the binary format.

Over time, some fields that used to be hardcoded became customizeable on a group-per-group basis.

Thus, later versions include some extra fields as compared to earlier ones.

The above example belongs to the latest OSAm version encountered in Oni: 6.

Lower versions lack certain fields, and the following content is simply shifted backwards.

Versions of OSAm occurring in Oni are 4, 5 and 6.