Music
Technical Information
Music is stored in Lego Island SI files. SI files are derivatives of the Resource Interchange File Format best known as the basis of AVI and WAV files.
All music appears to be 11025Hz Mono Signed 16-bit. All bytes are little endian.
Music appears to begin with a MxDa and is split into chunks of MxCh. The MxDa header contains information about the PCM audio in the MxCh chunks. The first MxCh appears to be information about the remainder of the chunks in the MxDa structure.
MxDa Header Specification
| Bytes | Offset | Description |
|---|---|---|
MxDa |
0 | Identifier |
MxCh |
4 | Chunk Header |
| Chunk Size | 8 | 4-byte Integer |
| Sub-Chunk Size | 22 | 4-byte Integer - The remaining size of this chunk after this value |
| Audio Format | 26 | 2-byte Integer - 1 = PCM, others indicate some form of compression |
| Number of Channels | 28 | 2-byte Integer - 1 = Mono, 2 = Stereo |
| Sample Rate | 30 | 4-byte Integer |
| Byte Rate | 34 | 4-byte Integer - is equal to Sample Rate * Number of Channels * BitsPerSample/8
|
| Bytes per Sample | 36 | 2-byte Integer - is equal to Number of Channels * BitsPerSample/8
|
| Bits per Sample per Channel | 38 | 2-byte Integer - 8 = 8-bit, 16 = 16-bit, etc. |
MxCh Specification
| Bytes | Offset | Description |
|---|---|---|
MxCh |
0 | Chunk Header |
| Chunk Size | 4 | 4-byte Integer |
| Data | 8 | Arbitrary data no more than "Chunk Size" in bytes |