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/* See LICENSE file for copyright and license details. */
#include "stream.h"
#include "util.h"
#include <sys/mman.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <limits.h>
#include <inttypes.h>
#include <string.h>
#include <unistd.h>
USAGE("[-h] file [(frames | 'auto') [(width | 'same') (height | 'same') [format | 'same']]]")
static void
rewrite(struct stream *stream, int frames_auto)
{
char head[STREAM_HEAD_MAX];
ssize_t headlen;
size_t frame_size, frame_count, length;
struct stat st;
char *data;
echeck_frame_size(stream->width, stream->height, stream->pixel_size, 0, stream->file);
frame_size = stream->width * stream->height * stream->pixel_size;
if (fstat(stream->fd, &st))
eprintf("fstat %s:", stream->file);
if (!S_ISREG(st.st_mode))
eprintf("%s: not a regular file\n", stream->file);
frame_count = (size_t)(st.st_size) / frame_size;
if (frame_count * frame_size != (size_t)(st.st_size))
eprintf("%s: given the select width and height, "
"the file has an incomplete frame\n", stream->file);
if (frames_auto)
stream->frames = frame_count;
else if (stream->frames != frame_count)
eprintf("%s: frame count mismatch\n", stream->file);
SPRINTF_HEAD_ZN(head, stream->frames, stream->width, stream->height, stream->pixfmt, &headlen);
length = stream->frames * frame_size;
if (length > (size_t)SSIZE_MAX || (size_t)headlen > (size_t)SSIZE_MAX - length)
eprintf("%s: video is too long\n", stream->file);
if ((size_t)headlen > stream->headlen)
if (ftruncate(stream->fd, length + headlen))
eprintf("ftruncate %s:", stream->file);
data = mmap(0, length + (size_t)headlen, PROT_READ | PROT_WRITE, MAP_SHARED, stream->fd, 0);
if (data == MAP_FAILED)
eprintf("mmap %s:", stream->file);
if ((size_t)headlen != stream->headlen)
memmove(data + headlen, data + stream->headlen, length);
memcpy(data, head, (size_t)headlen);
munmap(data, length + (size_t)headlen);
if ((size_t)headlen < stream->headlen)
if (ftruncate(stream->fd, length + headlen))
eprintf("ftruncate %s:", stream->file);
}
int
main(int argc, char *argv[])
{
struct stream stream;
int headless = 0, frames_auto = 0;
ARGBEGIN {
case 'h':
headless = 1;
break;
default:
usage();
} ARGEND;
if (headless) {
if (argc != 5)
eprintf("all positional arguments are mandatory unless -h is used\n");
} else if (argc != 1 && argc != 2 && argc != 4 && argc != 5) {
usage();
}
memset(&stream, 0, sizeof(stream));
stream.file = argv[0];
stream.fd = eopen(stream.file, O_RDWR);
if (!headless)
einit_stream(&stream);
if (argc < 2 || !strcmp(argv[1], "auto"))
frames_auto = 1;
else
stream.frames = etozu_arg("the frame count", argv[1], 0, SIZE_MAX);
if (argc < 4);
else if (strcmp(argv[2], "same"))
stream.width = etozu_arg("the width", argv[2], 1, SIZE_MAX);
else if (headless)
eprintf("cannot use both 'same' and -h\n");
if (argc < 4);
else if (strcmp(argv[3], "same"))
stream.height = etozu_arg("the height", argv[3], 1, SIZE_MAX);
else if (headless)
eprintf("cannot use both 'same' and -h\n");
if (argc < 5);
else if (strcmp(argv[4], "same")) {
if (strlen(argv[4]) >= sizeof(stream.pixfmt))
eprintf("choosen pixel format is unsupported\n");
strcpy(stream.pixfmt, argv[5]);
if (set_pixel_size(&stream))
eprintf("choosen pixel format is unsupported\n");
} else if (headless) {
eprintf("cannot use both 'same' and -h\n");
} else if (argc > 1) {
usage();
}
rewrite(&stream, frames_auto);
close(stream.fd);
return 0;
}
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