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view libs/vorbis/codebook.h @ 1:e7ca128b8713

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looks nice :)
author John Tsiombikas <nuclear@member.fsf.org>
date Sun, 02 Feb 2014 00:35:22 +0200
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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 1994-2009 *
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