BRS (File Format)
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BRS (Binary Remix Sequence) files contain sequence data for the NoteFairy (Rainbow Notes) object. Super Mario Galaxy and Super Mario Galaxy 2 each contain only one BRS file, located in AudioRes/Info/JaiRemixSeq.arc/brs/defaultremixseq.brs.
Header
The BRS format contains no header magic like most files do. Instead, it consists of a Sequence Count and Offsets. The size of the header is 0x4 + (Sequence Count x 0x4):
| Offset | Type | Description |
|---|---|---|
| 0x00 | UInt32 (0x4) | Sequence Count |
Offsets
Each offset holds the offset of a Sequence relative to the beginning of the file and is formatted like this:
| Offset | Type | Description |
|---|---|---|
| 0x00 | UInt32 (0x4) | Offset |
Sequence Header
Each sequence's header consists of a Track and Note Count:
| Offset | Type | Description |
|---|---|---|
| 0x00 | UInt32 (0x4) | Track Count |
| 0x04 | UInt32 (0x4) | Note Count |
Unused/Unknown Section
The header is followed by a section that doesn't seem to do anything. This section's size is Note Count x 0x4.
| Offset | Type | Description |
|---|---|---|
| 0x00 | UInt32 (0x4) | Unused/Unknown |
Track
Each Track starts by defining its instrument (0x4), followed by the individual Key-presses for a Note (0x10 each). There is no padding between Tracks.
Only 16 keys can be played at once.
Instrument
| Offset | Type | Description |
|---|---|---|
| 0x00 | UInt16 (0x2) | Not used |
| 0x02 | UInt8 (0x1) | Bank Number |
| 0x03 | UInt8 (0x1) | Program Number |
Key
Duration's intended range is 0-1440 after being scaled. Any value above 1440 is clamped to 1440. However, due to the first 3 bytes being discarded at one point, a scaled duration above 255 can cause unexpected behavior.
For instance, if a scaled duration is 0x1234, it is clamped to 0x05A0 (1440) and the 0x05 is discarded later on, making 0xA0 (160) how long it actually plays for.
The tempo at any given time is calculated using: (player_magnitude * 3600.0) / (note_fairy_path_length / note_count)
The scaled duration is calculated using: (120.0 * duration / tempo)
| Offset | Type | Description |
|---|---|---|
| 0x00 | UInt32 (0x4) | Key (0x00 = C-1, 0x60 = C4 (middle C), 0x7F = G9, FFFFFFFF = None) |
| 0x04 | UInt32 (0x4) | Velocity. Valid range: 0-127. |
| 0x08 | UInt32 (0x4) | Duration (in ticks?). Scaled to the tempo the song is being played at.
Valid range: 0-255 after being scaled. |
| 0x0C | UInt32 (0x4) | Delay (in ticks?) |
Sequences in SMG & SMG2
A sequence can be defined in Obj_arg4 for the NoteFairy object. Obj_arg4 directly corresponds to the sequence index in defaultremixseq.brs. The following sequences are available in both games:
| Obj_arg4 | Name | Note Count | Notes |
|---|---|---|---|
| 0 | Super Mario Bros. main theme (long) | 13 | Unused |
| 1 | Super Mario Bros. main theme (short) | 7 | Unused |
| 2 | Super Mario Bros. underground theme | 43 | |
| 3 | Super Mario Bros. main theme (short) | 7 | Unused |
| 4 | Super Mario Bros. underwater theme | 46 | |
| 5 | Super Mario World bonus room theme | 64 |