Vorbis dev - Aug 2003 - Entropy coding in Vorbis

I have developed a flexible arithmetic coder implementation and I am now
looking to incorporate it into a compression system for some proper
testing. It is my intention to incorporate the coder into the Vorbis
codec to attempt to improve on the current Huffman tree system. It would
be useful if someone could point me at the main c and h files that deal
with the entropy coding as I am currently trailing  through the
execution path from the encoder example.<br>
Forgive the general nature of this reply but I thought it specific enough
to warrant its inclusion on this list.<br>
Regards,<br>
Richard.
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Richard Felton |
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BBC Research & Development
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Kingswood Warren, Tadworth, 
Surrey, KT20 6NP<br>
tel. +44 (0) 1737 839835 || int. 39835

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On Monday 11 August 2003 23:15, Richard Felton wrote:
>  I have developed a flexible arithmetic coder implementation and I am now
> looking to incorporate it into a compression system for some proper
> testing. It is my intention to incorporate the coder into the Vorbis codec
> to attempt to improve on the current Huffman tree system. It would be
> useful if someone could point me at the main c and h files that deal with
> the entropy coding as I am currently trailing  through the execution path
> from the encoder example.
>
>  Forgive the general nature of this reply but I thought it specific enough
> to warrant its inclusion on this list.
>
Richard,

You'll find that the entropy coding is implemented in
vorbis/lib/codebook.[ch]
and vorbis/lib/sharedbook.[ch]. 

The relevant functions are mostly called from res0.c and floor1.c (for the 
current encoder). 

<p>Mike

p.s. Please do not ever send HTML mail, especially to mailing lists.

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