[vorbis] question about codebook

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Hi, all

I am studying the ogg-vorbis algorithm but I have less knowledge about the 
codebook structure of vorbis. After tracing the release source code, I 
found it doesn't use huffman tree to decode the huffman code instead of 
using a special mapping and pre-look. The memory requirement seems similar 
with huffman tree decoding. Could anyone tell me how the vorbis huffman 
decoding works and the difference or advantage. Or where can I get the 
information. Thanks...

trimp

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