[xiph-cvs] cvs commit: vorbis/doc residue-pack.png vorbis-spec-res.html

Monty xiphmont at xiph.org
Thu Jul 18 14:52:37 PDT 2002



xiphmont    02/07/18 14:52:37

  Modified:    doc      vorbis-spec-res.html
  Added:       doc      residue-pack.png
  Log:
  Keep stuffing in-progress spec work into CVS

Revision  Changes    Path
1.2       +97 -16    vorbis/doc/vorbis-spec-res.html

Index: vorbis-spec-res.html
===================================================================
RCS file: /usr/local/cvsroot/vorbis/doc/vorbis-spec-res.html,v
retrieving revision 1.1
retrieving revision 1.2
diff -u -r1.1 -r1.2
--- vorbis-spec-res.html	2002/07/18 07:10:25	1.1
+++ vorbis-spec-res.html	2002/07/18 21:52:36	1.2
@@ -14,13 +14,14 @@
 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>
+hybrids as mixed by channel coupling.  The exact semantic content of
+the vector does not matter to the residue abstraction.<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>
+Whatever the exact qualities, the Vorbis residue abstraction codes the
+residue vectors into the bitstream packet, and then reconstructs the
+vectors 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>
 
@@ -28,26 +29,106 @@
 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>
+interleaving and partitioning vary by residue encoding number, however
+the high-level process used to classify and encode the residue vector
+is the same in all three variants.<p>
+
+A set of coded residue vectors are all of the same length.  High level
+coding structure, ignoring for the moment exactly how a partition is
+encoded and simply trusting that it is, is as follows:<p>
+
+<ul>
+<li>Each vector is partitioned into multiple equal sized chunks
+according to configuration specified.  If we have a vector size of
+<i>n</i>, a partition size <i>residue_partition_size</i>, and a total
+of <i>ch</i> residue vectors, the total number of paritioned chunks
+coded is <i>n</i>/<i>residue_partition_size</i>*<i>ch</i>.  It is
+important to note that the integer division truncates.  In the below
+example, we assume an example <i>residue_partition_size</i> of 8.<p>
+
+<li>Each partition in each vector has a classification number that
+specifies which of multiple configured VQ codebook setups are used to
+decode that partition.  The classification numbers of each partition
+can be thought of as forming a vector, as in the illustration below.
+Just as the residue vectors are coded in grouped partitions to
+increase encoding efficiency, the classification vector is also
+partitioned into chunks.  The integer elements of each scalar in a
+classification chunk are built into a single scalar that represents
+the classification numbers in that chunk.  In the below example, the
+classification codeword encodes two classification numbers.<p>
+
+<li>The values in a residue vector may be encoded monolithically in a
+single pass through the residue vector, but more often efficient
+codebook design dictates that each vector is encoded as the additive
+sum of several passes through the residue vector using more than one
+VQ codebook.  Thus, each residue value potentially accumulates values
+from multiple decode passes.  The classification value associated with
+a partition is the same in each pass, thus the classification codeword
+is coded only in the first pass.<p>
+
+</ul>
+
+<img src="residue-pack.png"><p>
+
+<h2>residue 0</h2>
+
+Residue 0 and 1 differ only in the way the values within a residue
+partition are interleaved during partition encoding (visually treated
+as a black box- or cyan box or brown box- in the above figure).<p>
+
+Residue encoding 0 interleaves VQ encoding according to the
+dimension of the codebook used to encode a partition in a specific
+pass.  The dimension of the codebook need not be the same in multiple
+passes, however the partition size must be an even multiple of the
+codebook dimension.<p>
+
+As an example, assume a partition vector of size eight, to be encoded
+by residue 0 using codebook sizes of 8, 4, 2 and 1:<p>
+
+<pre>
+
+            original residue vector: [ 0 1 2 3 4 5 6 7 ]
+
+codebook dimensions = 8  encoded as: [ 0 1 2 3 4 5 6 7 ]
+
+codebook dimensions = 4  encoded as: [ 0 2 4 6 ], [ 1 3 5 7 ]
 
-<h2> residue 0 </h2>
+codebook dimensions = 2  encoded as: [ 0 4 ], [ 1 5 ], [ 2 6 ], [ 3 7 ]
 
-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>
+codebook dimensions = 1  encoded as: [ 0 ], [ 1 ], [ 2 ], [ 3 ], [ 4 ], [ 5 ], [ 6 ], [ 7 ]
 
-Residue element interleave within each chunk 
+</pre>
 
+It is worth mentioning at this point that no configurable value in the
+residue coding setup is restricted to a power of two.<p>
 
+<h2> residue 1 </h2>
 
-Coding order is rougly as follows
+Residue 1 does not interleave VQ encoding.  It represents partition
+vector scalars in order.  As with residue 0, however, partition length
+must be an integer multiple of the codebook dimension, although
+dimension may vary from pass to pass.
 
+As an example, assume a partition vector of size eight, to be encoded
+by residue 0 using codebook sizes of 8, 4, 2 and 1:<p>
 
-<h2> residue 1 </h2>
+<pre>
+
+            original residue vector: [ 0 1 2 3 4 5 6 7 ]
+
+codebook dimensions = 8  encoded as: [ 0 1 2 3 4 5 6 7 ]
+
+codebook dimensions = 4  encoded as: [ 0 1 2 3 ], [ 4 5 6 7 ]
 
+codebook dimensions = 2  encoded as: [ 0 1 ], [ 2 3 ], [ 4 5 ], [ 6 7 ]
+
+codebook dimensions = 1  encoded as: [ 0 ], [ 1 ], [ 2 ], [ 3 ], [ 4 ], [ 5 ], [ 6 ], [ 7 ]
+
+</pre>
+
 <h2> residue 2 </h2>
+
+
 
 <h1>Residue decode</h1>
 

<p><p>1.1                  vorbis/doc/residue-pack.png

Index: residue-pack.png
===================================================================
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