Sierra Audio

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Revision as of 21:40, 14 March 2006 by Multimedia Mike (talk | contribs) (added sample link; swapped version and header size fields since they appears to square with the sample files)
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This page describes audio format and codecs used in different games by Sierra. Multi-byte numbers are stored in little-endian format.

File Format

 Byte Value
 ----------------
 0    Version
 1    Header size
 2-5  String "SOL"
 6-7  Sample rate
 8    Flags
 9-10 Size

Flags are used to determine audio format and compression: 

 0x01 DPCM
 0x04 Stereo
 0x10 16-bit

Working scheme to determine what decompressor to use: 

 if(Version == 0x8D) {
   if(Flags & USE_DPCM)
     use old DPCM variant;
   else
     use 8-bit unsigned mono PCM;
 }
 if(Flags == USE_DPCM | USE_16BIT)
   use 8->16 bit DPCM;
 else if(Flags == USE_DPCM)
   use new DPCM variant;
 else if(Flags & USE_16BIT)
   use 16-bit mono or stereo PCM;
 else
   use 8-bit mono PCM;

Games Using This Format

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