--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/misc/libtremor/codebook.h	Sun Apr 24 22:57:57 2011 +0200
@@ -0,0 +1,102 @@
+/********************************************************************
+ *                                                                  *
+ * THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE.   *
+ *                                                                  *
+ * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
+ * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
+ * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
+ *                                                                  *
+ * THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002    *
+ * BY THE Xiph.Org FOUNDATION http://www.xiph.org/                  *
+ *                                                                  *
+ ********************************************************************
+
+ function: basic shared codebook operations
+
+ ********************************************************************/
+
+#ifndef _V_CODEBOOK_H_
+#define _V_CODEBOOK_H_
+
+#include "ogg.h"
+
+/* This structure encapsulates huffman and VQ style encoding books; it
+   doesn't do anything specific to either.
+
+   valuelist/quantlist are nonNULL (and q_* significant) only if
+   there's entry->value mapping to be done.
+
+   If encode-side mapping must be done (and thus the entry needs to be
+   hunted), the auxiliary encode pointer will point to a decision
+   tree.  This is true of both VQ and huffman, but is mostly useful
+   with VQ.
+
+*/
+
+typedef struct static_codebook{
+  long   dim;            /* codebook dimensions (elements per vector) */
+  long   entries;        /* codebook entries */
+  long  *lengthlist;     /* codeword lengths in bits */
+
+  /* mapping ***************************************************************/
+  int    maptype;        /* 0=none
+			    1=implicitly populated values from map column 
+			    2=listed arbitrary values */
+
+  /* The below does a linear, single monotonic sequence mapping. */
+  long     q_min;       /* packed 32 bit float; quant value 0 maps to minval */
+  long     q_delta;     /* packed 32 bit float; val 1 - val 0 == delta */
+  int      q_quant;     /* bits: 0 < quant <= 16 */
+  int      q_sequencep; /* bitflag */
+
+  long     *quantlist;  /* map == 1: (int)(entries^(1/dim)) element column map
+			   map == 2: list of dim*entries quantized entry vals
+			*/
+} static_codebook;
+
+typedef struct codebook{
+  long dim;           /* codebook dimensions (elements per vector) */
+  long entries;       /* codebook entries */
+  long used_entries;  /* populated codebook entries */
+
+  /* the below are ordered by bitreversed codeword and only used
+     entries are populated */
+  int           binarypoint;
+  ogg_int32_t  *valuelist;  /* list of dim*entries actual entry values */  
+  ogg_uint32_t *codelist;   /* list of bitstream codewords for each entry */
+
+  int          *dec_index;  
+  char         *dec_codelengths;
+  ogg_uint32_t *dec_firsttable;
+  int           dec_firsttablen;
+  int           dec_maxlength;
+
+  long     q_min;       /* packed 32 bit float; quant value 0 maps to minval */
+  long     q_delta;     /* packed 32 bit float; val 1 - val 0 == delta */
+
+} codebook;
+
+extern void vorbis_staticbook_clear(static_codebook *b);
+extern void vorbis_staticbook_destroy(static_codebook *b);
+extern int vorbis_book_init_decode(codebook *dest,const static_codebook *source);
+
+extern void vorbis_book_clear(codebook *b);
+extern long _book_maptype1_quantvals(const static_codebook *b);
+
+extern int vorbis_staticbook_unpack(oggpack_buffer *b,static_codebook *c);
+
+extern long vorbis_book_decode(codebook *book, oggpack_buffer *b);
+extern long vorbis_book_decodevs_add(codebook *book, ogg_int32_t *a, 
+				     oggpack_buffer *b,int n,int point);
+extern long vorbis_book_decodev_set(codebook *book, ogg_int32_t *a, 
+				    oggpack_buffer *b,int n,int point);
+extern long vorbis_book_decodev_add(codebook *book, ogg_int32_t *a, 
+				    oggpack_buffer *b,int n,int point);
+extern long vorbis_book_decodevv_add(codebook *book, ogg_int32_t **a,
+				     long off,int ch, 
+				    oggpack_buffer *b,int n,int point);
+
+extern int _ilog(unsigned int v);
+
+
+#endif