tremor/codebook.h

   1 /********************************************************************
   2  *                                                                  *
   3  * THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE.   *
   4  *                                                                  *
   5  * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
   6  * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
   7  * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
   8  *                                                                  *
   9  * THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002    *
  10  * BY THE Xiph.Org FOUNDATION http://www.xiph.org/                  *
  11  *                                                                  *
  12  ********************************************************************
  13
  14  function: basic shared codebook operations
  15
  16  ********************************************************************/
  17
  18 #ifndef _V_CODEBOOK_H_
  19 #define _V_CODEBOOK_H_
  20
  21 #include "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 } static_codebook;
  56
  57 typedef struct codebook{
  58   long dim;           /* codebook dimensions (elements per vector) */
  59   long entries;       /* codebook entries */
  60   long used_entries;  /* populated codebook entries */
  61
  62   /* the below are ordered by bitreversed codeword and only used
  63      entries are populated */
  64   int           binarypoint;
  65   ogg_int32_t  *valuelist;  /* list of dim*entries actual entry values */
  66   ogg_uint32_t *codelist;   /* list of bitstream codewords for each entry */
  67
  68   int          *dec_index;
  69   char         *dec_codelengths;
  70   ogg_uint32_t *dec_firsttable;
  71   int           dec_firsttablen;
  72   int           dec_maxlength;
  73
  74   long     q_min;       /* packed 32 bit float; quant value 0 maps to minval */
  75   long     q_delta;     /* packed 32 bit float; val 1 - val 0 == delta */
  76
  77 } codebook;
  78
  79 extern void vorbis_staticbook_clear(static_codebook *b);
  80 extern void vorbis_staticbook_destroy(static_codebook *b);
  81 extern int vorbis_book_init_decode(codebook *dest,const static_codebook *source);
  82
  83 extern void vorbis_book_clear(codebook *b);
  84 extern long _book_maptype1_quantvals(const static_codebook *b);
  85
  86 extern int vorbis_staticbook_unpack(oggpack_buffer *b,static_codebook *c);
  87
  88 extern long vorbis_book_decode(codebook *book, oggpack_buffer *b);
  89 extern long vorbis_book_decodevs_add(codebook *book, ogg_int32_t *a,
  90                                      oggpack_buffer *b,int n,int point);
  91 extern long vorbis_book_decodev_set(codebook *book, ogg_int32_t *a,
  92                                     oggpack_buffer *b,int n,int point);
  93 extern long vorbis_book_decodev_add(codebook *book, ogg_int32_t *a,
  94                                     oggpack_buffer *b,int n,int point);
  95 extern long vorbis_book_decodevv_add(codebook *book, ogg_int32_t **a,
  96                                      long off,int ch,
  97                                     oggpack_buffer *b,int n,int point);
  98
  99 extern int _ilog(unsigned int v);
 100
 101
 102 #endif