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Interleaf File: Difference between revisions
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An | An '''Interleaf File''' (extension '''.SI''') is a general-purpose asset archive format designed for streaming from CD-ROM. It was developed by [[Mindscape]] for use throughout [[LEGO Island]]. | ||
== Overview == | == Overview == | ||
The Interleaf file format was originally thought to be exclusive to ''[[LEGO Island]]'', but has since also been discovered in | The Interleaf file format was originally thought to be exclusive to ''[[LEGO Island]]'', but has since also been discovered in earlier [[Mindscape]] games called ''{{Wikipedia|Warhammer: Shadow of the Horned Rat}}'' and ''{{Wikipedia|Chessmaster 5000}}''. Regardless, it remains an extremely obscure format and therefore is not well documented. All information known about this format has been through reverse engineering or interviews with game developers. | ||
Interleaf files are derived from the {{Wikipedia|Resource Interchange File Format}} standard (best known as the basis of {{Wikipedia|Audio Video Interleave}} and {{Wikipedia|WAV}} files). They are comprised of various LEGO Island-specific structures (such as [[MxDa]] and [[MxCh]]), however these structures usually contain standard format file data (such as PCM WAV audio and Windows BMP images). | Interleaf files are derived from the {{Wikipedia|Resource Interchange File Format}} standard (best known as the basis of {{Wikipedia|Audio Video Interleave}} and {{Wikipedia|WAV}} files). They are comprised of various LEGO Island-specific structures (such as [[MxDa]] and [[MxCh]]), however these structures usually contain standard format file data (such as PCM WAV audio and Windows BMP images). | ||
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When working with Interleaf files, this interleaving needs to be taken account as it will dictate how the data is both extracted and inserted. One file stream may be separated into several chunks with chunks of other files interleaved between them. | When working with Interleaf files, this interleaving needs to be taken account as it will dictate how the data is both extracted and inserted. One file stream may be separated into several chunks with chunks of other files interleaved between them. | ||
Since audio is stored in PCM, Interleaf files can be crudely listened to using Audacity's "Import Raw Data" feature. SI audio is always uncompressed mono PCM and is either 11025 Hz and 16-bit or 22050 Hz and 8-bit. Unfortunately due to the aforementioned chunked/interleaved nature of SI files, the audio retrieved through this method will be noticeably glitchy and will require further processing (removal of chunk headers and any non-audio chunks) to extract clean PCM data. | Since audio is stored in PCM, Interleaf files can be crudely listened to using Audacity's "Import Raw Data" feature. SI audio is always uncompressed mono PCM and is either 11025 Hz and 16-bit or 22050 Hz and 8-bit. Unfortunately, due to the aforementioned chunked/interleaved nature of SI files, the audio retrieved through this method will be noticeably glitchy and will require further processing (removal of chunk headers and any non-audio chunks) to extract clean PCM data. | ||
== See also == | == See also == | ||
* [[JUKEBOX.SI]] | * [[JUKEBOX.SI]] | ||
* [[NOCD.SI]] | * [[NOCD.SI]] | ||