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Music (view source)

Revision as of 12:32, 18 April 2019

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== Technical Information ==
#REDIRECT [[JUKEBOX.SI]]
Music is stored in Lego Island SI files. SI files are derivatives of the {{Wikipedia|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 <code>MxDa</code> and is split into chunks of <code>MxCh</code>. The <code>MxDa</code> header contains information about the PCM audio in the <code>MxCh</code> chunks. The first <code>MxCh</code> appears to be information about the remainder of the chunks in the <code>MxDa</code> structure.
 
'''MxDa Header Specification'''
{| class="wikitable"
|-
! Bytes !! Offset !! Description
|-
| <code>MxDa</code> || 0 || Identifier
|-
| <code>MxCh</code> || 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 <code>Sample Rate * Number of Channels * BitsPerSample/8</code>
|-
| Bytes per Sample || 36 || 2-byte Integer - is equal to <code>Number of Channels * BitsPerSample/8</code>
|-
| Bits per Sample per Channel || 38 || 2-byte Integer - 8 = 8-bit, 16 = 16-bit, etc.
|}
 
'''MxCh Specification'''
{| class="wikitable"
|-
! Bytes !! Offset !! Description
|-
| <code>MxCh</code> || 0 || Chunk Header
|-
| Chunk Size || 4 || 4-byte Integer
|-
| Data|| 8 || Arbitrary data no more than "Chunk Size" in bytes
|}
Retrieved from "https://www.legoisland.org/wiki/Special:MobileDiff/22"

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