BAMTA File Format
Yannik Marchand edited this page May 5, 2023
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6 revisions
AAL > Audio Metadata (BAMTA)
This file is part of a BARS file and contains metadata about an audio resource.
| Offset | Size | Description |
|---|---|---|
| 0x0 | 4 | Magic number ("AMTA") |
| 0x4 | 2 | BOM (always 0xFEFF) |
| 0x6 | 2 | Version number (0x0100, 0x0300 or 0x0400) |
| 0x8 | 4 | Filesize |
| 0xC | 4 | Offset to data section |
| 0x10 | 4 | Offset to marker section |
| 0x14 | 4 | Offset to ext section. Only present in version 3.0 and 4.0 |
| 0x14 or 0x18 | 4 | Offset to string table section |
The file is padded with null bytes at the end such that its size is a multiple of 4.
Header:
| Offset | Size | Description |
|---|---|---|
| 0x0 | 4 | Identifier ("DATA") |
| 0x4 | 4 | Body size |
Body:
| Offset | Size | Description |
|---|---|---|
| 0x0 | 4 | Asset name (offset into string table) |
| 0x4 | 4 | Number of output samples at 48000 Hz |
| 0x8 | 1 | Type (0=Wave, 1=Stream) |
| 0x9 | 1 | Total number of channels |
| 0xA | 1 | Number of stream tracks (up to 8) |
| 0xB | 1 | Flags: 1 = unknown 2 = unknown 4 = is looped 8 = unknown 16 = unknown |
| 0xC | 4 | Unknown (float) |
| 0x10 | 4 | Sample rate |
| 0x14 | 4 | Loop start sample |
| 0x18 | 4 | Number of samples |
| 0x1C | 4 | Volume in decibel (float). This is always negative. Calculate the real volume as follows: 10 ** (value / 20). |
| 0x20 | 8 * 8 | Stream tracks |
| 0x60 | 4 | Amplitude peak value (float). Only present in version 4.0 |
| Offset | Size | Description |
|---|---|---|
| 0x0 | 4 | Number of channels |
| 0x4 | 4 | Volume (float) |
Header:
| Offset | Size | Description |
|---|---|---|
| 0x0 | 4 | Identifier ("MARK") |
| 0x4 | 4 | Body size |
Body:
| Offset | Size | Description |
|---|---|---|
| 0x0 | 4 | Number of entries |
| 0x4 | Marker infos |
| Offset | Size | Description |
|---|---|---|
| 0x0 | 4 | Id |
| 0x4 | 4 | Name (offset into string table) |
| 0x8 | 4 | Start pos |
| 0xC | 4 | Length |
Header:
| Offset | Size | Description |
|---|---|---|
| 0x0 | 4 | Identifier ("EXT_") |
| 0x4 | 4 | Body size |
Body:
| Offset | Size | Description |
|---|---|---|
| 0x0 | 4 | Number of entries |
| 0x4 | Ext entries |
| Offset | Size | Description |
|---|---|---|
| 0x0 | 4 | Name (offset into string table) |
| 0x4 | 4 | Value (float) |
⚠️ Nintendo's tools are broken.Obviously, an offset into the string table should be measured in bytes. However, Nintendo's tooling counts the number of characters instead. Thus, if a string contains non-ascii characters, all offsets to strings that come after it are wrong.
| Offset | Size | Description |
|---|---|---|
| 0x0 | 4 | Identifier ("STRG") |
| 0x4 | 4 | Body size |
| 0x8 | Body (null-terminated strings) |
Duplicate strings are stored in the string table only once.