[vorbis] bitrate peeling

[Giuliano Pochini]

> Another thought: Maybe it is possible to develop a peeler which has its own
> psychoacoustic model so it can intelligently decide where to rip off bits and where
> better keep 'em. So, concluding: Writing a good peeler could be almost as complex
> as writing a good encoder!

And probably as slow as a good encoder. No, most of the work must be done by
the
encoder, not by the peeler. Otherwise the peeler loses most of its usefulness.
Peeling should be at least as fast as converting back to wave.

> There has been lots of scientific research done about MP3, ACC and other industry
> standards. But I've never seen papers been published about Ogg so far

Because mp3 is old and many people worked on and documented it. And because
mp3
is much more simple than ogg. AAC studies have been published mainly for
marketing purposes IMO.

Bye.
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