[vorbis] bitrate peeling

[Andy Dale]

so no other codecs really have peeling or at least not tools either?
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----- Original Message -----
From: "Christian.Buchner" <Christian.Buchner1 at epost.de>
To: <vorbis at xiph.org>
Sent: Thursday, November 07, 2002 4:03 PM
Subject: Re: [vorbis] bitrate peeling

<p>:
:
:
: > do any other audio formats support peeling? cuz afaik you just reencode
mp3z
: > 'n' such to get lower bitrates also.
:
: Depends on the coding they use.
:
: As far as I know MP3 stores subband by subband in Huffman coding.
: That means you can cut away whole subbands to cut off the high
: frequencies for example. But that's about all you can do without
: resorting to re-quantization.
:
: To be really peelable you have to code the data progressively.
: And that is a form of art. ;)
:
: Bitplane coding for example can be used achieve that. You would
: then encode bitplane by bitplane, for example using arithmetic
: coding. And for peeling data off, you would simply drop the least
: significant bitplanes. That is (somewhat simplified) what JPEG
: 2000 does.
:
: I do not know enough about the entropy coding used in Vorbis
: to comment on it. Maybe someone can shed some light on it with
: a few sentences.
:
: Christian
:
:
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<p>--- >8 ----
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