/******************************************************************** *                                                                  * * THIS FILE IS PART OF THE OggVorbis SOFTWARE 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 SOURCE CODE IS (C) COPYRIGHT 1994-2015             * * by the Xiph.Org Foundation https://xiph.org/                     * *                                                                  * ********************************************************************  function: basic shared codebook operations  ********************************************************************/ #ifndef _V_CODEBOOK_H_#define _V_CODEBOOK_H_ #include <ogg/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 */  char  *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                        */  int allocedp;} static_codebook; typedef struct codebook{  long dim;           /* codebook dimensions (elements per vector) */  long entries;       /* codebook entries */  long used_entries;  /* populated codebook entries */  const static_codebook *c;   /* for encode, the below are entry-ordered, fully populated */  /* for decode, the below are ordered by bitreversed codeword and only     used entries are populated */  float        *valuelist;  /* list of dim*entries actual entry values */  ogg_uint32_t *codelist;   /* list of bitstream codewords for each entry */   int          *dec_index;  /* only used if sparseness collapsed */  char         *dec_codelengths;  ogg_uint32_t *dec_firsttable;  int           dec_firsttablen;  int           dec_maxlength;   /* The current encoder uses only centered, integer-only lattice books. */  int           quantvals;  int           minval;  int           delta;} codebook; extern void vorbis_staticbook_destroy(static_codebook *b);extern int vorbis_book_init_encode(codebook *dest,const static_codebook *source);extern int vorbis_book_init_decode(codebook *dest,const static_codebook *source);extern void vorbis_book_clear(codebook *b); extern float *_book_unquantize(const static_codebook *b,int n,int *map);extern float *_book_logdist(const static_codebook *b,float *vals);extern float _float32_unpack(long val);extern long   _float32_pack(float val);extern int  _best(codebook *book, float *a, int step);extern long _book_maptype1_quantvals(const static_codebook *b); extern int vorbis_book_besterror(codebook *book,float *a,int step,int addmul);extern long vorbis_book_codeword(codebook *book,int entry);extern long vorbis_book_codelen(codebook *book,int entry);   extern int vorbis_staticbook_pack(const static_codebook *c,oggpack_buffer *b);extern static_codebook *vorbis_staticbook_unpack(oggpack_buffer *b); extern int vorbis_book_encode(codebook *book, int a, oggpack_buffer *b); extern long vorbis_book_decode(codebook *book, oggpack_buffer *b);extern long vorbis_book_decodevs_add(codebook *book, float *a,                                     oggpack_buffer *b,int n);extern long vorbis_book_decodev_set(codebook *book, float *a,                                    oggpack_buffer *b,int n);extern long vorbis_book_decodev_add(codebook *book, float *a,                                    oggpack_buffer *b,int n);extern long vorbis_book_decodevv_add(codebook *book, float **a,                                     long off,int ch,                                    oggpack_buffer *b,int n);   #endif