multithreaded vorbis encoding

Hello,

I have some code that encodes PCM data into a vorbis stream, using the
workflow shown in http://www.xiph.org/vorbis/doc/libvorbis/overview.html.

By analyzing that process with valgrind/cachegrind I found out that 95%
of the time used for encoding is spent in the function
"vorbis_analysis(&vb, 0)".

My question now is: would it be technically possible to parallelize this?
I think about using multiple worker threads for the vorbis_analysis calls,
especiall on multi core systems this would be a big benefit.

=> Are the blocks passed as "vb" independent from each other,
   so that I can encode them in parallel?

regards,
   Thomas
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Thomas Eschenbacher                       <[email protected]>