AST file: Difference between revisions
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AST files contain PCM16 sound data. They're used in Super Mario Galaxy for musics, and possibly in other games. | AST files contain PCM16 sound data. They're used in Super Mario Galaxy for musics, and possibly in other games. | ||
They contain an header followed by a BLCK chunk. | They contain an header followed by a BLCK chunk.<br> | ||
All the data in those files are big-endian, except where mentioned. | All the data in those files are big-endian, except where mentioned.<br> | ||
All the offsets are absolute (from begining of file), except where mentioned. | All the offsets are absolute (from begining of file), except where mentioned.<br> | ||
All the sizes are in bytes, except where mentioned. | All the sizes are in bytes, except where mentioned.<br> | ||
=== AST header === | === AST header === | ||
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=== BLCK chunk === | === BLCK chunk === | ||
The BLCK chunk directly follows the AST header. It contains a 32-byte header, followed by the PCM16 sound data. | The BLCK chunk directly follows the AST header. It contains a 32-byte header, followed by the PCM16 sound data.<br> | ||
Here's a description of it: | Here's a description of it: | ||
Revision as of 17:49, 21 September 2009
AST files contain PCM16 sound data. They're used in Super Mario Galaxy for musics, and possibly in other games.
They contain an header followed by a BLCK chunk.
All the data in those files are big-endian, except where mentioned.
All the offsets are absolute (from begining of file), except where mentioned.
All the sizes are in bytes, except where mentioned.
AST header
The header is 64 bytes long. Here's a description of it:
| Offset | Size | Description |
|---|---|---|
| 0x0000 | 4 | "STRM" (0x5354524D) |
| 0x0004 | 4 | Size of the BLCK chunk |
| 0x0008 | 4 | Unknown (0x00010010) |
| 0x000C | 4 | Unknown |
| 0x0010 | 4 | Sampling rate in Hz (typically 0x7D00 = 32000 Hz) |
| 0x0014 | 4 | ???????? |
| 0x0018 | 4 | ???????? |
| 0x001C | 4 | ???????? |
| 0x0020 | 4 | Block size? (typically 0x2760) |
| 0x0024 | 28 | Unknown |
BLCK chunk
The BLCK chunk directly follows the AST header. It contains a 32-byte header, followed by the PCM16 sound data.
Here's a description of it:
| Offset (from beginning of BLCK chunk) | Size | Description |
|---|---|---|
| 0x0000 | 4 | "BLCK" (0x424C434B) |
| 0x0004 | 4 | Block size? (typically 0x2760) |
| 0x0008 | 24 | Padding (zero) |
| 0x0020 | variable | PCM16 data |
WARNING: The PCM16 data is stored in BIG-ENDIAN! Don't forget to byteswap each sample you read or your sound will be pure junk!