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NIPSYS64 importer now supports Ogg Vorbis audio format that is used by many games. It uses my own decoder prototype based on the official specification from xiph.org. Only mono files are supported at the moment, and I'm yet to optimize the decoding process, but my implementation is very compact and makes extensive use of NIPSYS64 codebase what is a good thing.
Vorbis codec is based on modified discrete cosine transform (MDCT) like many other contemporary audio codecs. It employs vector quantization and Huffman coding to store data in a compact form, normally within Ogg container.