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/* 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\n", argv0);
}
int
main(int argc, char *argv[])
{
struct stream stream;
char *buf, *row;
size_t ptr, n, i, j, hm, row_size;
ssize_t r;
ARGBEGIN {
default:
usage();
} ARGEND;
if (argc)
usage();
stream.file = "<stdin>";
stream.fd = STDIN_FILENO;
einit_stream(&stream);
fprint_stream_head(stdout, &stream);
fflush(stdout);
if (ferror(stdout))
eprintf("<stdin>:");
if (stream.width > SIZE_MAX / stream.pixel_size)
eprintf("<stdin>: video is too wide\n");
row_size = stream.width * stream.pixel_size;
if (!(row = malloc(row_size)))
eprintf("malloc:");
if (row_size > SIZE_MAX / stream.height)
eprintf("<stdin>: video frame is too large\n");
n = row_size * stream.height;
if (!(buf = malloc(n)))
eprintf("malloc:");
hm = stream.height - 1;
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;
for (i = 0; i < stream.height >> 1; i++) {
j = hm - i;
memcpy(row, buf + i * row_size, row_size);
memcpy(buf + i * row_size, buf + j * row_size, row_size);
memcpy(buf + j * row_size, row, row_size);
}
for (ptr = 0; ptr < n; ptr += (size_t)r) {
r = write(STDOUT_FILENO, buf + ptr, n - ptr);
if (r < 0)
eprintf("write <stdout>");
}
}
return 0;
}
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