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
|
/* See LICENSE file for copyright and license details. */
#include "arg.h"
#include "stream.h"
#include "util.h"
#include <fcntl.h>
#include <stdint.h>
#include <unistd.h>
static void
usage(void)
{
eprintf("usage: %s count file\n", argv0);
}
int
main(int argc, char *argv[])
{
struct stream stream;
size_t count = 0, ptr, n, ptw;
ssize_t r;
char buf[BUFSIZ];
ARGBEGIN {
default:
usage();
} ARGEND;
if (argc != 2)
usage();
if (tozu(argv[0], 0, SIZE_MAX, &count))
eprintf("the count must be an integer in [0, %zu]\n", SIZE_MAX);
stream.file = argv[1];
stream.fd = open(stream.file, O_RDONLY);
if (stream.fd < 0)
eprintf("open %s:", stream.file);
einit_stream(&stream);
if (stream.frames > SIZE_MAX / count)
eprintf("%s: video too long\n", stream.file);
stream.frames *= count;
fprint_stream_head(stdout, &stream);
fflush(stdout);
if (ferror(stdout))
eprintf("<stdout>:");
while (count--) {
posix_fadvise(stream.fd, 0, 0, POSIX_FADV_SEQUENTIAL);
for (ptw = 0; ptw < stream.ptr;) {
r = write(STDOUT_FILENO, stream.buf + ptw, stream.ptr - ptw);
if (r < 0)
eprintf("write <stdout>:");
ptw += (size_t)r;
}
for (ptr = 0;;) {
r = pread(stream.fd, buf, sizeof(buf), ptr);
if (r < 0)
eprintf("pread %s:", stream.file);
else if (r == 0)
break;
ptr += n = (size_t)r;
for (ptw = 0; ptw < n;) {
r = write(STDOUT_FILENO, buf + ptw, n - ptw);
if (r < 0)
eprintf("write <stdout>:");
ptw += (size_t)r;
}
}
}
close(stream.fd);
return 0;
}
|
