BAMTA (File Format)
BAMTA (Binary Audio MeTA data), also known as BAMETA is a file format used on Wii U games like Super Mario Maker and Nintendo Switch games like Mario Kart 8 Deluxe and The Legend of Zelda: Breath of the Wild, normally included into BARS files. It contains audio information.
File Format
Header
The file starts with a header that is 0x1C bytes long.
| Offset | Type | Description |
|---|---|---|
| 0x00 | Char[4] | File magic. Always AMTA in ASCII. |
| 0x04 | UInt16 | Byte-order-mark. FE FF for big endian, FF FE for little endian. |
| 0x06 | UInt16 | Version number. |
| 0x08 | UInt32 | File size in bytes. |
| 0x0C | UInt32 | DATA offset. |
| 0x10 | UInt32 | MARK offset. |
| 0x14 | UInt32 | EXT_ offset. |
| 0x18 | UInt32 | STRG offset. |
DATA
This section contains audio parameters, as well as stream information for BFSTP files.
| Offset | Type | Description |
|---|---|---|
| 0x00 | Char[4] | Section magic. Always DATA in ASCII. |
| 0x04 | UInt32 | Section size in bytes. |
| 0x08 | UInt32 | Sound name offset. |
| 0x0C | UInt32 | Unknown. Only seen as 0. |
| 0x10 | Byte | Audio type: 0 = wave, 1 = prefetch stream. |
| 0x11 | Byte | Number of channels. |
| 0x12 | Byte | Number of used stream informations. |
| 0x13 | Byte | Flag: xxAx xBCC. |
| 0x14 | Float | Volume. |
| 0x18 | UInt32 | Sample rate in hertzs. |
| 0x1C | UInt32 | Loop start in frames. |
| 0x20 | UInt32 | Loop end in frames. |
| 0x24 | Float | Loudness. |
| 0x28 | Stream Information | Stream information 1. |
| 0x30 | Stream Information | Stream information 2. |
| 0x38 | Stream Information | Stream information 3. |
| 0x40 | Stream Information | Stream information 4. |
| 0x48 | Stream Information | Stream information 5. |
| 0x50 | Stream Information | Stream information 6. |
| 0x58 | Stream Information | Stream information 7. |
| 0x60 | Stream Information | Stream information 8. |
| 0x68 | Float | Amplitude peak value. |
Stream Information
Stream information is only used by the game if the metadata points to a BFSTP file, although it's always present.
| Offset | Type | Description |
|---|---|---|
| 0x00 | Int32 | Stream channel count. |
| 0x04 | Float | Stream influence. |
MARK
This section contains unknown data.
| Offset | Type | Description |
|---|---|---|
| 0x00 | Char[4] | Section magic. Always MARK in ASCII. |
| 0x04 | UInt32 | Section size in bytes. |
| 0x08 | Int32 | Number of entries. |
MARK Entry
| Offset | Type | Description |
|---|---|---|
| 0x00 | UInt32 | Entry index. |
| 0x04 | UInt32 | Entry name offset. |
| 0x08 | UInt32 | Entry value. |
| 0x0C | UInt32 | Unknown, probably padding. Only seen as 0. |
EXT_
This section contains unknown data.
| Offset | Type | Description |
|---|---|---|
| 0x00 | Char[4] | Section magic. Always EXT_ in ASCII. |
| 0x04 | UInt32 | Section size in bytes. |
| 0x08 | Int32 | Number of entries. |
EXT_ Entry
| Offset | Type | Description |
|---|---|---|
| 0x00 | UInt32 | String offset. |
| 0x04 | UInt32 | Unknown. |
STRG
This section contains null-terminated strings which are linked by other sections.
| Offset | Type | Description |
|---|---|---|
| 0x00 | Char[4] | Section magic. Always STRG in ASCII. |
| 0x04 | UInt32 | Section size in bytes. |
Null-terminated strings follow the section header. The strings are linked by a section using an offset, which is relative to the end of the STRG header.
Version List
| Version | Found in |
|---|---|
| 1.0 | |
| 4.0 |
|
| 5.0 |
Tools
The following tools can handle BAMTA files:
- (none)
