1 /********************************************************************
2  *                                                                  *
3  * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *
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7  *                                                                  *
8  * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2009             *
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 17030 2010-03-25 06:52:55Z 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   int allocedp;
56 } static_codebook;
57 
58 typedef struct codebook{
59   long dim;           /* codebook dimensions (elements per vector) */
60   long entries;       /* codebook entries */
61   long used_entries;  /* populated codebook entries */
62   const static_codebook *c;
63 
64   /* for encode, the below are entry-ordered, fully populated */
65   /* for decode, the below are ordered by bitreversed codeword and only
66      used entries are populated */
67   float        *valuelist;  /* list of dim*entries actual entry values */
68   ogg_uint32_t *codelist;   /* list of bitstream codewords for each entry */
69 
70   int          *dec_index;  /* only used if sparseness collapsed */
71   char         *dec_codelengths;
72   ogg_uint32_t *dec_firsttable;
73   int           dec_firsttablen;
74   int           dec_maxlength;
75 
76   /* The current encoder uses only centered, integer-only lattice books. */
77   int           quantvals;
78   int           minval;
79   int           delta;
80 } codebook;
81 
82 extern void vorbis_staticbook_destroy(static_codebook *b);
83 extern int vorbis_book_init_encode(codebook *dest,const static_codebook *source);
84 extern int vorbis_book_init_decode(codebook *dest,const static_codebook *source);
85 extern void vorbis_book_clear(codebook *b);
86 
87 extern float *_book_unquantize(const static_codebook *b,int n,int *map);
88 extern float *_book_logdist(const static_codebook *b,float *vals);
89 extern float _float32_unpack(long val);
90 extern long   _float32_pack(float val);
91 extern int  _best(codebook *book, float *a, int step);
92 extern int _ilog(unsigned int v);
93 extern long _book_maptype1_quantvals(const static_codebook *b);
94 
95 extern int vorbis_book_besterror(codebook *book,float *a,int step,int addmul);
96 extern long vorbis_book_codeword(codebook *book,int entry);
97 extern long vorbis_book_codelen(codebook *book,int entry);
98 
99 
100 
101 extern int vorbis_staticbook_pack(const static_codebook *c,oggpack_buffer *b);
102 extern static_codebook *vorbis_staticbook_unpack(oggpack_buffer *b);
103 
104 extern int vorbis_book_encode(codebook *book, int a, oggpack_buffer *b);
105 
106 extern long vorbis_book_decode(codebook *book, oggpack_buffer *b);
107 extern long vorbis_book_decodevs_add(codebook *book, float *a,
108                                      oggpack_buffer *b,int n);
109 extern long vorbis_book_decodev_set(codebook *book, float *a,
110                                     oggpack_buffer *b,int n);
111 extern long vorbis_book_decodev_add(codebook *book, float *a,
112                                     oggpack_buffer *b,int n);
113 extern long vorbis_book_decodevv_add(codebook *book, float **a,
114                                      long off,int ch,
115                                     oggpack_buffer *b,int n);
116 
117 
118 
119 #endif
120