[vorbis-dev] Peeling Specification

[Segher Boessenkool]

Alan MacDonald wrote:
> 
> Segher Boessenkool wrote:
> > 1) get Ogg packets from Ogg pages
> > 2) throw away parts of the packets (at the end of the packets)
> > 3) reframe into new Ogg pages.
> 
> So were basically talking about making the quantized residue values
> coarser, due to the way they are packed?

That's the main idea of peeling, yes.

> Does it make sense to actually
> use new codebooks, instead of just chopping off the finer values?

That requires recoding, and is much more expensive compute-time wise.

> Or
> are the codebooks structured in such a way that chopping a q10 stream
> down to around q5 size, would yield about the same results as recoding
> the residue values with the q5 codebooks?

Nope.  That's why peeling doesn't work too well.

<p>Segher

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