/******************************************************************** *                                                                  * * 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