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
|
/* See LICENSE file for copyright and license details. */
#include "arg.h"
#include "stream.h"
#include "util.h"
#include <fcntl.h>
#include <inttypes.h>
#include <string.h>
#include <unistd.h>
static void
usage(void)
{
eprintf("usage: %s [-l left] [-r right] [-a above] [-b below] [-t]\n", argv0);
}
int
main(int argc, char *argv[])
{
struct stream stream;
char *buf, *image;
size_t ptr, n, m, imgw, imgh, rown;
size_t xoff, yoff, h, x, y;
size_t left = 0, right = 0, top = 0, bottom = 0;
ssize_t r;
int tile = 0;
ARGBEGIN {
case 'l':
if (tozu(EARGF(usage()), 0, SIZE_MAX, &left))
eprintf("argument of -l must be an integer in [0, %zu]\n", SIZE_MAX);
break;
case 'r':
if (tozu(EARGF(usage()), 0, SIZE_MAX, &right))
eprintf("argument of -r must be an integer in [0, %zu]\n", SIZE_MAX);
break;
case 'a':
if (tozu(EARGF(usage()), 0, SIZE_MAX, &top))
eprintf("argument of -a must be an integer in [0, %zu]\n", SIZE_MAX);
break;
case 'b':
if (tozu(EARGF(usage()), 0, SIZE_MAX, &bottom))
eprintf("argument of -b must be an integer in [0, %zu]\n", SIZE_MAX);
break;
case 't':
tile = 1;
break;
default:
usage();
} ARGEND;
if (argc)
usage();
stream.file = "<stdin>";
stream.fd = STDIN_FILENO;
einit_stream(&stream);
if (stream.width > SIZE_MAX / stream.pixel_size)
eprintf("<stdin>: video frame is too large\n");
n = stream.width * stream.pixel_size;
if (n > SIZE_MAX / stream.height)
eprintf("<stdin>: video frame is too large\n");
n *= stream.height;
if (!(buf = malloc(n)))
eprintf("malloc:");
if (stream.width > SIZE_MAX - left)
eprintf("<stdout>: output video is too wide\n");
imgw = stream.width + left;
if (imgw > SIZE_MAX - right)
eprintf("<stdout>: output video is too wide\n");
imgw += right;
if (stream.height > SIZE_MAX - top)
eprintf("<stdout>: output video is too tall\n");
imgh = stream.height + top;
if (imgh > SIZE_MAX - bottom)
eprintf("<stdout>: output video is too tall\n");
imgh += bottom;
if (imgw > SIZE_MAX / stream.pixel_size)
eprintf("<stdout>: output video frame is too large\n");
m = imgw *= stream.pixel_size;
if (m > SIZE_MAX / imgh)
eprintf("<stdout>: output video frame is too large\n");
m *= imgh;
if (!(image = malloc(m)))
eprintf("malloc:");
if (!tile)
memset(image, 0, m);
stream.width += left + right;
h = stream.height += top + bottom;
fprint_stream_head(stdout, &stream);
fflush(stdout);
if (ferror(stdout))
eprintf("<stdout>:");
stream.width -= left + right;
stream.height -= top + bottom;
left *= stream.pixel_size;
right *= stream.pixel_size;
rown = stream.width * stream.pixel_size;
xoff = (rown - (left % rown)) % rown;
yoff = (stream.height - (top % stream.height)) % stream.height;
memcpy(buf, stream.buf, ptr = stream.ptr);
for (;;) {
for (; ptr < n; ptr += (size_t)r) {
r = read(stream.fd, buf + ptr, n - ptr);
if (r < 0) {
eprintf("read %s:", stream.file);
} else if (r == 0) {
if (!ptr)
break;
eprintf("%s: incomplete frame", stream.file);
}
}
if (!ptr)
break;
if (!tile) {
for (y = 0; y < stream.height; y++)
memcpy(image + left + (y + top) * imgw, buf + y * rown, rown);
} else {
for (y = 0; y < stream.height; y++)
for (x = 0; x < imgw; x++)
image[x + (y + top) * imgw] = buf[((x + xoff) % rown) + y * rown];
for (y = 0; y < top; y++)
memcpy(image + y * imgw, image + (((y + yoff) % stream.height) + top) * imgw, imgw);
for (y = top + stream.height; y < h; y++)
memcpy(image + y * imgw, image + (((y + yoff) % stream.height) + top) * imgw, imgw);
}
for (ptr = 0; ptr < m; ptr += (size_t)r) {
r = write(STDOUT_FILENO, image + ptr, m - ptr);
if (r < 0)
eprintf("write <stdout>");
}
}
return 0;
}
|
