CSMP (File Format)
The .CSMP file format is an audio format seen in Retro Studios games starting in Metroid Prime 3. It's very similar in use to AGSC and usually contains sound affects. Where CSMP differs is the fact that it only contains one sound and is broken up into obvious data chunks with easily identifiable sizes.
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To do: Notate Tropical Freeze differences. |
Format
CSMP files are made up of a number of data chunks. Since not every file always has every chunk, the best way to read a CSMP file is to use a while loop to check the chunk headers and parse their contents until you reach the end of the file.
Header
This is the header structure found in Metroid Prime 3 and Donkey Kong Country Returns; Tropical Freeze's is a bit different.
| Offset | Size | Description |
|---|---|---|
| 0x0 | 4 | "CSMP" magic fourCC |
| 0x4 | 4 | Version; always 1 |
Chunk Header
Every chunk begins with this header; it contains a brief data type identifier and a size.
| Offset | Size | Description |
|---|---|---|
| 0x0 | 4 | Chunk type fourCC |
| 0x4 | 4 | Chunk size (N) |
| 0x8+N | End of chunk | |
NAME
This chunk just has a null-terminated string; it's the name of the contained sound data.
INFO
| Offset | Size | Description |
|---|---|---|
| 0x0 | 1 | Unknown |
| 0x1 | 1 | Loop Flag |
| 0x2 | 4 | Unknown |
| 0x6 | 2 | Unknown |
| 0x8 | 4 | Volume |
PAD
This chunk is just padded with 0xFF; usually contains 0x14 bytes.
DATA
The DATA section essentially just embeds a standard DSP, including the full header and ADPCM audio data. Refer to the DSP page for details. Note that for some reason, the DATA chunk is always 4 bytes smaller than its size indicates.