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+ +

+Ogg Vorbis I format specification: residue setup and decode +

+ +Last update to this document: July 18, 2002
+ +

Overview

+ +A residue vector represents the fine detail of the audio spectrum of +one channel in an audio frame after the encoder subtracts the floor +curve and performs any channel coupling. A residue vector may +represent spectral lines, spectral magnitude, spectral phase or +hybrids as mixed by channel coupling.

+ +Whatever the exact qualities, the Vorbis residue abstraction codes +groups of residue vectors of the same length into the bitstream +packet, and then reconstructs the vectors into the same groups during +decode. Vorbis makes use of three different encoding variants +(numbered 0, 1 and 2) of the same basic vector encoding abstration.

+ +

Residue format

+ +Reside format takes the bundles of vectors, partitions the vectors +into chunks, classifies each chunk, encodes the chunk classifications +and finally encodes the chunks using the the specific VQ arrangement +defined for each selected selected classification. The exact +interleaving and partitioning vary by residue encoding number.

+ +

residue 0

+ +Residue format zero partitions each channel vector seperately +according to the chunksize specified in setup. Each chunk for each +channel has a unique classification. Classification numbers are coded +by group to increase entropy coding efficiency. Coding of residue +values is both interleaved and cascaded.

+ +Residue element interleave within each chunk + + + +Coding order is rougly as follows + + +

residue 1

+ +

residue 2

+ +

Residue decode

+ +

header decode

+ +

packet decode, format 0

+ +

packet decode, format 1

+ +

packet decode, format 2

+ + +

+ +

+ + + +Ogg is a Xiph.org Foundation effort +to protect essential tenets of Internet multimedia from corporate +hostage-taking; Open Source is the net's greatest tool to keep +everyone honest. See About +the Xiph.org Foundation for details. +

+ +Ogg Vorbis is the first Ogg audio CODEC. Anyone may freely use and +distribute the Ogg and Vorbis specification, whether in a private, +public or corporate capacity. However, the Xiph.org Foundation and +the Ogg project (xiph.org) reserve the right to set the Ogg Vorbis +specification and certify specification compliance.

+ +Xiph.org's Vorbis software CODEC implementation is distributed under a +BSD-like license. This does not restrict third parties from +distributing independent implementations of Vorbis software under +other licenses.

+ + + -- 2.7.4