media/libvorbis/lib/codebook.h

   1 /********************************************************************
   2  *                                                                  *
   3  * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *
   4  * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
   5  * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
   6  * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
   7  *                                                                  *
   8  * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2007             *
   9  * by the Xiph.Org Foundation http://www.xiph.org/                  *
  10  *                                                                  *
  11  ********************************************************************
  12
  13  function: basic shared codebook operations
  14  last mod: $Id: codebook.h 13293 2007-07-24 00:09:47Z xiphmont $
  15
  16  ********************************************************************/
  17
  18 #ifndef _V_CODEBOOK_H_
  19 #define _V_CODEBOOK_H_
  20
  21 #include <ogg/ogg.h>
  22
  23 /* This structure encapsulates huffman and VQ style encoding books; it
  24    doesn't do anything specific to either.
  25
  26    valuelist/quantlist are nonNULL (and q_* significant) only if
  27    there's entry->value mapping to be done.
  28
  29    If encode-side mapping must be done (and thus the entry needs to be
  30    hunted), the auxiliary encode pointer will point to a decision
  31    tree.  This is true of both VQ and huffman, but is mostly useful
  32    with VQ.
  33
  34 */
  35
  36 typedef struct static_codebook{
  37   long   dim;            /* codebook dimensions (elements per vector) */
  38   long   entries;        /* codebook entries */
  39   long  *lengthlist;     /* codeword lengths in bits */
  40
  41   /* mapping ***************************************************************/
  42   int    maptype;        /* 0=none
  43                             1=implicitly populated values from map column
  44                             2=listed arbitrary values */
  45
  46   /* The below does a linear, single monotonic sequence mapping. */
  47   long     q_min;       /* packed 32 bit float; quant value 0 maps to minval */
  48   long     q_delta;     /* packed 32 bit float; val 1 - val 0 == delta */
  49   int      q_quant;     /* bits: 0 < quant <= 16 */
  50   int      q_sequencep; /* bitflag */
  51
  52   long     *quantlist;  /* map == 1: (int)(entries^(1/dim)) element column map
  53                            map == 2: list of dim*entries quantized entry vals
  54                         */
  55
  56   /* encode helpers ********************************************************/
  57   struct encode_aux_nearestmatch *nearest_tree;
  58   struct encode_aux_threshmatch  *thresh_tree;
  59   struct encode_aux_pigeonhole  *pigeon_tree;
  60
  61   int allocedp;
  62 } static_codebook;
  63
  64 /* this structures an arbitrary trained book to quickly find the
  65    nearest cell match */
  66 typedef struct encode_aux_nearestmatch{
  67   /* pre-calculated partitioning tree */
  68   long   *ptr0;
  69   long   *ptr1;
  70
  71   long   *p;         /* decision points (each is an entry) */
  72   long   *q;         /* decision points (each is an entry) */
  73   long   aux;        /* number of tree entries */
  74   long   alloc;
  75 } encode_aux_nearestmatch;
  76
  77 /* assumes a maptype of 1; encode side only, so that's OK */
  78 typedef struct encode_aux_threshmatch{
  79   float *quantthresh;
  80   long   *quantmap;
  81   int     quantvals;
  82   int     threshvals;
  83 } encode_aux_threshmatch;
  84
  85 typedef struct encode_aux_pigeonhole{
  86   float min;
  87   float del;
  88
  89   int  mapentries;
  90   int  quantvals;
  91   long *pigeonmap;
  92
  93   long fittotal;
  94   long *fitlist;
  95   long *fitmap;
  96   long *fitlength;
  97 } encode_aux_pigeonhole;
  98
  99 typedef struct codebook{
 100   long dim;           /* codebook dimensions (elements per vector) */
 101   long entries;       /* codebook entries */
 102   long used_entries;  /* populated codebook entries */
 103   const static_codebook *c;
 104
 105   /* for encode, the below are entry-ordered, fully populated */
 106   /* for decode, the below are ordered by bitreversed codeword and only
 107      used entries are populated */
 108   float        *valuelist;  /* list of dim*entries actual entry values */
 109   ogg_uint32_t *codelist;   /* list of bitstream codewords for each entry */
 110
 111   int          *dec_index;  /* only used if sparseness collapsed */
 112   char         *dec_codelengths;
 113   ogg_uint32_t *dec_firsttable;
 114   int           dec_firsttablen;
 115   int           dec_maxlength;
 116
 117 } codebook;
 118
 119 extern void vorbis_staticbook_clear(static_codebook *b);
 120 extern void vorbis_staticbook_destroy(static_codebook *b);
 121 extern int vorbis_book_init_encode(codebook *dest,const static_codebook *source);
 122 extern int vorbis_book_init_decode(codebook *dest,const static_codebook *source);
 123 extern void vorbis_book_clear(codebook *b);
 124
 125 extern float *_book_unquantize(const static_codebook *b,int n,int *map);
 126 extern float *_book_logdist(const static_codebook *b,float *vals);
 127 extern float _float32_unpack(long val);
 128 extern long   _float32_pack(float val);
 129 extern int  _best(codebook *book, float *a, int step);
 130 extern int _ilog(unsigned int v);
 131 extern long _book_maptype1_quantvals(const static_codebook *b);
 132
 133 extern int vorbis_book_besterror(codebook *book,float *a,int step,int addmul);
 134 extern long vorbis_book_codeword(codebook *book,int entry);
 135 extern long vorbis_book_codelen(codebook *book,int entry);
 136
 137
 138
 139 extern int vorbis_staticbook_pack(const static_codebook *c,oggpack_buffer *b);
 140 extern int vorbis_staticbook_unpack(oggpack_buffer *b,static_codebook *c);
 141
 142 extern int vorbis_book_encode(codebook *book, int a, oggpack_buffer *b);
 143 extern int vorbis_book_errorv(codebook *book, float *a);
 144 extern int vorbis_book_encodev(codebook *book, int best,float *a,
 145                                oggpack_buffer *b);
 146
 147 extern long vorbis_book_decode(codebook *book, oggpack_buffer *b);
 148 extern long vorbis_book_decodevs_add(codebook *book, float *a,
 149                                      oggpack_buffer *b,int n);
 150 extern long vorbis_book_decodev_set(codebook *book, float *a,
 151                                     oggpack_buffer *b,int n);
 152 extern long vorbis_book_decodev_add(codebook *book, float *a,
 153                                     oggpack_buffer *b,int n);
 154 extern long vorbis_book_decodevv_add(codebook *book, float **a,
 155                                      long off,int ch,
 156                                     oggpack_buffer *b,int n);
 157
 158
 159
 160 #endif