BME (File Format)
File Format
Binary Melody files store commands for the audio engine to play chords/melodies. The format is constructed of instructions (OpCodes) similar to BMS files. Super Mario Galaxy & Super Mario Galaxy 2 each only have one BME file, stored in AudioRes/Info/JaiMe.arc/bme/defaultme.bme.
Header
The header is constructed like this:
| Offset | Type | Description |
|---|---|---|
| 0x0 | UInt32 (0x4) | Amount N of entries (0x28 in SMG, 0x29 in SMG2) |
| 0x4 + N * 0x4 | UInt32 (0x4) | Offset to BME data |
Data
| This page is in progress and may contain incomplete information or editor's notes. |
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Each instruction (OpCode) stands for its own function in the engine:
| OpCode | Function (SMG/SMG2) | Usage | Example | Description |
|---|---|---|---|---|
| 00 | {OpCode[1]} {Bank[1]} OpCode: one byte, 00. Bank: one byte with range 0x00 through 0xFF. This byte represents a WSYS ID. |
00 0A 00: OpCode 0A: WSYS ID 10 |
Defines the WSYS/IBNK whose sounds are to be used in a Track. | |
| 01 | {OpCode[1]} {Program[1]} OpCode: one byte, 01. Program: one byte with range 0x00 through 0xFF. This byte represents a LIST entry in the IBNK belonging to the defined WSYS ID. |
01 04 01: OpCode 04: IBNK LIST entry 4 |
Defines the Keyboard which holds more specific sounds from an IBNK. | |
| 02 | {OpCode[1]} {Bank[1]} {Program[1]} OpCode: one byte, 02. Bank: one byte with range 0x00 through 0xFF. This byte represents a WSYS ID. Program: one byte ranging from 0x00 through 0xFF. This byte represents a LIST entry in the IBNK belonging to the defined WSYS ID. |
02 00 0D 02: OpCode 00: WSYS ID 0 0D: IBNK LIST entry 13 |
Defines the Instrument to be used in a Track. | |
| 10 | {OpCode[1]} {TrackNumber[1]} {Pointer[3]} OpCode: one byte, 0x10. TrackNumber: one byte with unknown range. Pointer: three bytes with range 0x000000 through 0xFFFFFF. Defines an offset in the file. |
10 00 00 01 F5 10: OpCode 00: Track 0 00 01 F5: Offset |
Creates a Track which plays a Melody individually. | |
| 20 | {OpCode[1]} {Unknown} OpCode: one byte, 0x20. Unknown |
Starts a Track. | ||
| 24 | {OpCode[1]} OpCode: one byte, 0x24. |
Stops execution of a Track. | ||
| 40 | {OpCode[1]} {Pointer[3]} OpCode: one byte, 0x40. Pointer: three bytes with range 0x000000 through 0xFFFFFF. Defines an offset in the file. |
40 00 0B CF 40: OpCode 00 0B CF: Offset |
Redirects execution to the defined offset. Execution can return with 71. | |
| 70 | ||||
| 71 | {OpCode[1]} OpCode: one byte, 0x71. |
Returns redirected execution (like from 40) to the initial call. |