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
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
|
#include "backend.h"
#include "bitmap.h"
#include "image.h"
#include "source.h"
#include "source_private.h"
#include <assert.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/mman.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <turbojpeg.h>
struct private {
int fd;
void *data;
size_t len;
tjhandle jpeg;
int width;
int height;
};
static void free_private(void *raw_private)
{
if (!raw_private) {
return;
}
struct private *private = raw_private;
tjDestroy(private->jpeg);
if (private->fd >= 0) {
munmap(private->data, private->len);
close(private->fd);
}
free(private);
}
static void load_image(void *raw_private, struct imv_image **image, int *frametime)
{
*image = NULL;
*frametime = 0;
struct private *private = raw_private;
void *bitmap = malloc(private->height * private->width * 4);
int rcode = tjDecompress2(private->jpeg, private->data, private->len,
bitmap, private->width, 0, private->height, TJPF_RGBA, TJFLAG_FASTDCT);
if (rcode) {
free(bitmap);
return;
}
struct imv_bitmap *bmp = malloc(sizeof *bmp);
bmp->width = private->width;
bmp->height = private->height;
bmp->format = IMV_ABGR;
bmp->data = bitmap;
*image = imv_image_create_from_bitmap(bmp);
}
static const struct imv_source_vtable vtable = {
.load_first_frame = load_image,
.free = free_private
};
static enum backend_result open_path(const char *path, struct imv_source **src)
{
struct private private;
private.fd = open(path, O_RDONLY);
if (private.fd < 0) {
return BACKEND_BAD_PATH;
}
off_t len = lseek(private.fd, 0, SEEK_END);
if (len < 0) {
close(private.fd);
return BACKEND_BAD_PATH;
}
private.len = len;
private.data = mmap(NULL, private.len, PROT_READ, MAP_PRIVATE, private.fd, 0);
if (private.data == MAP_FAILED || !private.data) {
close(private.fd);
return BACKEND_BAD_PATH;
}
private.jpeg = tjInitDecompress();
if (!private.jpeg) {
munmap(private.data, private.len);
close(private.fd);
return BACKEND_UNSUPPORTED;
}
int rcode = tjDecompressHeader(private.jpeg, private.data, private.len,
&private.width, &private.height);
if (rcode) {
tjDestroy(private.jpeg);
munmap(private.data, private.len);
close(private.fd);
return BACKEND_UNSUPPORTED;
}
struct private *new_private = malloc(sizeof private);
memcpy(new_private, &private, sizeof private);
*src = imv_source_create(&vtable, new_private);
return BACKEND_SUCCESS;
}
static enum backend_result open_memory(void *data, size_t len, struct imv_source **src)
{
struct private private;
private.fd = -1;
private.data = data;
private.len = len;
private.jpeg = tjInitDecompress();
if (!private.jpeg) {
return BACKEND_UNSUPPORTED;
}
int rcode = tjDecompressHeader(private.jpeg, private.data, private.len,
&private.width, &private.height);
if (rcode) {
tjDestroy(private.jpeg);
return BACKEND_UNSUPPORTED;
}
struct private *new_private = malloc(sizeof private);
memcpy(new_private, &private, sizeof private);
*src = imv_source_create(&vtable, new_private);
return BACKEND_SUCCESS;
}
const struct imv_backend imv_backend_libjpeg = {
.name = "libjpeg-turbo",
.description = "Fast JPEG codec based on libjpeg. "
"This software is based in part on the work "
"of the Independent JPEG Group.",
.website = "https://libjpeg-turbo.org/",
.license = "The Modified BSD License",
.open_path = &open_path,
.open_memory = &open_memory,
};
|
