1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
|
/********************************************************************
* *
* THIS FILE IS PART OF THE Ogg Vorbis SOFTWARE CODEC SOURCE CODE. *
* USE, DISTRIBUTION AND REPRODUCTION OF THIS SOURCE IS GOVERNED BY *
* THE GNU PUBLIC LICENSE 2, WHICH IS INCLUDED WITH THIS SOURCE. *
* PLEASE READ THESE TERMS DISTRIBUTING. *
* *
* THE OggSQUISH SOURCE CODE IS (C) COPYRIGHT 1994-1999 *
* by 1999 Monty <monty@xiph.org> and The XIPHOPHORUS Company *
* http://www.xiph.org/ *
* *
********************************************************************/
#ifndef _VQGEN_H_
#define _VQGEN_H_
typedef struct vqgen{
int it;
int elements;
int aux;
/* point cache */
double *pointlist;
long points;
long allocated;
/* entries */
double *entrylist;
long *assigned;
double *bias;
long entries;
double (*metric_func) (struct vqgen *v,double *entry,double *point);
double *(*weight_func) (struct vqgen *v,double *point);
} vqgen;
typedef struct vqbook{
long dim; /* codebook dimensions (elements per vector) */
long entries; /* codebook entries */
long min; /* packed 24 bit float; quant value 0 maps to minval */
long delta; /* packed 24 bit float; val 1 - val 0 == delta */
int quant; /* 0 < quant <= 16 */
int sequencep; /* bitflag */
double *valuelist; /* list of dim*entries actual entry values */
long *quantlist; /* list of dim*entries quantized entry values */
long *codelist; /* list of bitstream codewords for each entry */
long *lengthlist; /* codeword lengths in bits */
/* auxiliary encoding/decoding information */
/* encode: provided pre-calculated partitioning tree */
/* decode: hufftree */
long *ptr0;
long *ptr1;
/* auxiliary encoding information. Not used in decode */
double *n; /* decision hyperplanes: sum(x_i*n_i)[0<=i<dim]=c */
double *c;
long *p;
long *q;
long aux;
long alloc;
} vqbook;
typedef struct {
long min; /* packed 24 bit float */
long delta; /* packed 24 bit float */
int quant; /* 0 < quant <= 16 */
int sequencep; /* bitflag */
} quant_meta;
static inline double *_point(vqgen *v,long ptr){
return v->pointlist+((v->elements+v->aux)*ptr);
}
static inline double *_aux(vqgen *v,long ptr){
return _point(v,ptr)+v->aux;
}
static inline double *_now(vqgen *v,long ptr){
return v->entrylist+(v->elements*ptr);
}
extern void vqgen_init(vqgen *v,int elements,int aux,int entries,
double (*metric)(vqgen *,double *, double *),
double *(*weight)(vqgen *,double *));
extern void vqgen_addpoint(vqgen *v, double *p,double *aux);
extern double vqgen_iterate(vqgen *v);
extern void vqgen_unquantize(vqgen *v,quant_meta *q);
extern void vqgen_quantize(vqgen *v,quant_meta *q);
extern long float24_pack(double val);
extern double float24_unpack(long val);
extern void vqsp_book(vqgen *v,vqbook *b,long *quantlist);
extern int vqenc_entry(vqbook *b,double *val);
#endif
|
