AST (File Format)
File Format
AST files are audio streams, found in both Super Mario Galaxy and Super Mario Galaxy 2.
Header
AST file header, 0x40 bytes in length.
| Offset | Type | Description |
|---|---|---|
| 0x00 | String | File magic. STRM in ASCII. |
| 0x04 | UInt32 | Size of all sound blocks. File Size - Header Length |
| 0x08 | UInt16 | Audio format. 0 = ADPCM, 1 = PCM16 |
| 0x0A | UInt16 | Bit depth. |
| 0x0C | UInt16 | Number of channels. |
| 0x0E | UInt16 | Unknown. |
| 0x10 | UInt32 | Sample rate. |
| 0x14 | UInt32 | Total sample count. |
| 0x18 | UInt32 | Loop start in samples. |
| 0x1C | UInt32 | Loop end in samples. |
| 0x20 | UInt32 | Unknown. Seems to be the size of the first block. |
| 0x24 | UInt32 | Unknown. Always 0. |
| 0x28 | UInt32 | Unknown. Always 0x7F000000. |
| 0x2C | Byte | Always 0. Likely padding. |
| 0x40 | End of Header. |
BLCK
AST file contain multiple BLCK sections, each containing sound data.
| Offset | Type | Description |
|---|---|---|
| 0x00 | String | Block magic. BLCK in ASCII. |
| 0x04 | UInt32 | Block size. |
| 0x08 | Byte | Unknown. Likely padding for alignment. |
| 0x20 | Byte | Sound data. |