--- /dev/null
+<HTML><HEAD><TITLE>xiph.org: Ogg Vorbis documentation</TITLE>
+<BODY bgcolor="#ffffff" text="#202020" link="#006666" vlink="#000000">
+<nobr><img src="white-ogg.png"><img src="vorbisword2.png"></nobr><p>
+
+<h1><font color=#000070>
+Ogg Vorbis I format specification: residue setup and decode
+</font></h1>
+
+<em>Last update to this document: July 18, 2002</em><br>
+
+<h1>Overview</h1>
+
+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.<p>
+
+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.<p>
+
+<h1>Residue format</h1>
+
+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.<p>
+
+<h2> residue 0 </h2>
+
+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.<p>
+
+Residue element interleave within each chunk
+
+
+
+Coding order is rougly as follows
+
+
+<h2> residue 1 </h2>
+
+<h2> residue 2 </h2>
+
+<h1>Residue decode</h1>
+
+<h2>header decode</h2>
+
+<h2>packet decode, format 0</h2>
+
+<h2>packet decode, format 1</h2>
+
+<h2>packet decode, format 2</h2>
+
+
+<hr>
+<a href="http://www.xiph.org/">
+<img src="white-xifish.png" align=left border=0>
+</a>
+<font size=-2 color=#505050>
+
+Ogg is a <a href="http://www.xiph.org">Xiph.org Foundation</a> 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 <a href="http://www.xiph.org/about.html">About
+the Xiph.org Foundation</a> for details.
+<p>
+
+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.<p>
+
+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.<p>
+
+Ogg, Vorbis, Xiph.org Foundation and their logos are trademarks (tm)
+of the <a href="http://www.xiph.org/">Xiph.org Foundation</a>. These
+pages are copyright (C) 1994-2002 Xiph.org Foundation. All rights
+reserved.<p>
+
+</body>
+
projects / platform / upstream / libvorbis.git / commitdiff
