SY24: damn you TMC I wanted to write that page. But good job

2026-02-11T13:00:47Z

damn you TMC I wanted to write that page. But good job

← Older revision		Revision as of 13:00, 11 February 2026
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	[[Category:File formats]]		[[Category:File formats]]
	~~{{WIP}}~~

	'''BAS''' ~~stands for~~ (~~presumably)~~ '''B'''inary '''A'''~~udio~~ '''S'''~~equence~~. ~~It is used in several JSystem games, including~~ Super Mario Galaxy and Super Mario Galaxy 2.		'''BAS''' ('''B'''inary '''A'''nimation '''S'''ound) files play [[List of Sounds (SMG2)\|Sound Effects]] when a defined frame of a [[BCK (File Format)\|BCK]] animation is reached. They only work with a BCK file of the same filename. ''Super Mario Galaxy'' and ''Super Mario Galaxy 2'' each contain BAS files in many ObjectData files.

	== Header ==		== File specifications ==
			=== Header ===
	Every BAS starts with this header. It is 0x8 in size.		Every BAS starts with this header. It is 0x8 in size.
	{\|class="wikitable"		{\|class="wikitable"
Line 27:		Line 27:
	\|}		\|}

	== Sound Entry ==		=== Sound Entry ===
	0x20 in size, including padding.		0x20 in size, including padding.
	{\|class="wikitable"		{\|class="wikitable"

AwesomeTMC: Initial BAS page (still very WIP)

2025-01-31T08:01:21Z

Initial BAS page (still very WIP)

New page

[[Category:File formats]]
{{WIP}}

'''BAS''' stands for (presumably) '''B'''inary '''A'''udio '''S'''equence. It is used in several JSystem games, including Super Mario Galaxy and Super Mario Galaxy 2.

== Header ==
Every BAS starts with this header. It is 0x8 in size.
{|class="wikitable"
! Offset !! Type !! Description
|-
| 0x00 || UInt16 || Entry Count
|-
| 0x02 || UInt16 || Unused
|-
| 0x04 || UInt32 *|| Pointer (in memory) to a class that implements virtual methods for:
* void doNothing(); // you can put anything here, just make sure one virtual function comes first.
* u32 *getSound(JAUSoundAnimation *);
* u32 getNumSounds(JAUSoundAnimation *);
in that order. Put 0 for default behavior. Always 0 in SMG/SMG2.
|-
|}
It is then followed by an array of sound entries:
{|class="wikitable"
! Offset !! Type !! Description
|-
| 0x08 || SoundEntry[Entry Count] || Array of sound entries.
|}

== Sound Entry ==
0x20 in size, including padding.
{|class="wikitable"
! Offset !! Type !! Description
|-
| 0x00 || UInt32 || Sound ID
|-
| 0x04 || Single || Start Frame
|-
| 0x08 || Single || End Frame
|-
| 0x0C || Single || Pitch
|-
| 0x10 || UInt32|| Flags:
bool useEndFrame(?) = (flags >> 6) & 0x01<br>
(Still unknown/unused but set: 32, 16, 4)
|-
| 0x14 || UInt8 || Volume
|-
| 0x15 || UInt8 || Pitch Factor
|-
| 0x16 || UInt8 || Loop Count
|-
| 0x17 || UInt8 || Panning
|-
| 0x18 || UInt8 || Volume Factor
|-
| 0x19 || UInt8[7] || Padding
|-
|}

(References: [https://github.com/SuperHackio/Hack.io/blob/master/Hack.io.BAS/BAS.cs Hack.io.BAS], [https://github.com/XAYRGA/bastool/blob/master/bastool/BinaryAudioSequence.cs bastool], [https://github.com/SunakazeKun/pyjaubas/blob/main/pyjaubas/bas.py pyjaubas])

BAS (File Format) - Revision history

SY24: damn you TMC I wanted to write that page. But good job

AwesomeTMC: Initial BAS page (still very WIP)