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
106
107
108
109
110
111
112
113
114
|
#ifndef _JPEG_INTERNAL_H_
#define _JPEG_INTERNAL_H_
#include "jpeg.h"
#include "jpeg_huffman.h"
#include "jpeg_bits.h"
#include "jpeg_debug.h"
#ifndef TRUE
#define TRUE 1
#endif
#ifndef FALSE
#define FALSE 0
#endif
#define JPEG_MAX_COMPONENTS 256
typedef struct _JpegScan JpegScan;
typedef struct _JpegQuantTable JpegQuantTable;
#define JPEG_ENTROPY_SEGMENT 0x0001
#define JPEG_LENGTH 0x0002
struct _JpegQuantTable {
int pq;
int16_t quantizer[64];
};
struct _JpegDecoder {
int width;
int height;
int depth;
int n_components;
JpegBits bits;
int error;
char *error_message;
int sof_type;
int width_blocks;
int height_blocks;
int restart_interval;
unsigned char *data;
unsigned int data_len;
struct{
int id;
int h_sample;
int v_sample;
int quant_table;
int h_subsample;
int v_subsample;
unsigned char *image;
int rowstride;
} components[JPEG_MAX_COMPONENTS];
JpegQuantTable quant_tables[4];
HuffmanTable dc_huff_table[4];
HuffmanTable ac_huff_table[4];
int scan_list_length;
struct{
int component_index;
int dc_table;
int ac_table;
int quant_table;
int x;
int y;
int offset;
}scan_list[10];
int scan_h_subsample;
int scan_v_subsample;
/* scan state */
int x,y;
int dc[4];
};
struct _JpegScan {
int length;
int n_components;
struct {
int index;
int dc_table;
int ac_table;
}block_list[10];
};
/* jpeg.c */
int jpeg_decoder_sof_baseline_dct(JpegDecoder *dec, JpegBits *bits);
int jpeg_decoder_define_quant_table(JpegDecoder *dec, JpegBits *bits);
int jpeg_decoder_define_huffman_table(JpegDecoder *dec, JpegBits *bits);
int jpeg_decoder_sos(JpegDecoder *dec, JpegBits *bits);
int jpeg_decoder_soi(JpegDecoder *dec, JpegBits *bits);
int jpeg_decoder_eoi(JpegDecoder *dec, JpegBits *bits);
int jpeg_decoder_application0(JpegDecoder *dec, JpegBits *bits);
int jpeg_decoder_application_misc(JpegDecoder *dec, JpegBits *bits);
int jpeg_decoder_comment(JpegDecoder *dec, JpegBits *bits);
int jpeg_decoder_restart_interval(JpegDecoder *dec, JpegBits *bits);
int jpeg_decoder_restart(JpegDecoder *dec, JpegBits *bits);
void jpeg_decoder_decode_entropy_segment(JpegDecoder *dec);
#endif
|
