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/* See LICENSE file for copyright and license details. */
#include "stream.h"
#include "util.h"
#include <sys/stat.h>
#include <errno.h>
#include <inttypes.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
void
eninit_stream(int status, struct stream *stream)
{
ssize_t r;
size_t n;
char *p = NULL, *w, *h, *f, *end;
for (stream->ptr = 0; p;) {
r = read(stream->fd, stream->buf + stream->ptr, sizeof(stream->buf) - stream->ptr);
if (r < 0)
enprintf(status, "read %s:", stream->file);
if (r == 0)
goto bad_format;
stream->ptr += (size_t)r;
p = memchr(stream->buf, '\n', stream->ptr);
}
*p = '\0';
w = strchr(stream->buf, ' ');
if (!w)
goto bad_format;
h = strchr(w + 1, ' ');
if (!h)
goto bad_format;
f = strchr(h + 1, ' ');
if (!f)
goto bad_format;
*w++ = *h++ = *f++ = '\0';
if (strlen(f) >= sizeof(stream->pixfmt))
goto bad_format;
strcpy(stream->pixfmt, f);
errno = 0;
stream->frames = strtoul(stream->buf, &end, 10);
if (errno == ERANGE && *stream->buf != '-')
eprintf("%s: too long\n", stream->file);
if (errno || *end)
goto bad_format;
errno = 0;
stream->width = strtoul(w, &end, 10);
if (errno == ERANGE && *stream->buf != '-')
eprintf("%s: too wide\n", stream->file);
if (errno || *end)
goto bad_format;
errno = 0;
stream->height = strtoul(h, &end, 10);
if (errno == ERANGE && *stream->buf != '-')
eprintf("%s: too tall\n", stream->file);
if (errno || *end)
goto bad_format;
if (!stream->width)
eprintf("%s: width is zero\n", stream->file);
if (!stream->height)
eprintf("%s: height is zero\n", stream->file);
n = (size_t)(p - stream->buf) + 1;
memmove(stream->buf, stream->buf + n, stream->ptr -= n);
while (stream->ptr < 5) {
r = read(stream->fd, stream->buf + stream->ptr, sizeof(stream->buf) - stream->ptr);
if (r < 0)
enprintf(status, "read %s:", stream->file);
if (r == 0)
goto bad_format;
stream->ptr += (size_t)r;
}
if (stream->buf[0] != '\0' ||
stream->buf[1] != 'u' || stream->buf[2] != 'i' ||
stream->buf[3] != 'v' || stream->buf[4] != 'f')
goto bad_format;
memmove(stream->buf, stream->buf + 5, stream->ptr -= 5);
stream->headlen = n + 5;
enset_pixel_size(status, stream);
return;
bad_format:
enprintf(status, "%s: file format not supported%s\n", stream->file);
}
int
set_pixel_size(struct stream *stream)
{
if (!strcmp(stream->pixfmt, "xyza"))
stream->pixel_size = 4 * sizeof(double);
else
return -1;
return 0;
}
void
enset_pixel_size(int status, struct stream *stream)
{
if (set_pixel_size(stream))
enprintf(status, "file %s uses unsupported pixel format: %s\n",
stream->file, stream->pixfmt);
}
void
fprint_stream_head(FILE *fp, struct stream *stream)
{
fprintf(fp, "%zu %zu %zu %s\n%cuivf",
stream->frames, stream->width, stream->height, stream->pixfmt, 0);
}
size_t
enread_stream(int status, struct stream *stream, size_t n)
{
ssize_t r = read(stream->fd, stream->buf + stream->ptr,
sizeof(stream->buf) - stream->ptr < n ?
sizeof(stream->buf) - stream->ptr : n);
if (r < 0)
enprintf(status, "read %s:", stream->file);
stream->ptr += (size_t)r;
return (size_t)r;
}
void
eninf_check_fd(int status, int fd, const char *file)
{
struct stat st;
if (fstat(fd, &st))
enprintf(status, "fstat %s:", file);
if (S_ISREG(st.st_mode))
enprintf(status, "%s is a regular file, refusing infinite write\n");
}
int
check_frame_size(size_t width, size_t height, size_t pixel_size)
{
if (!width || !height || !pixel_size)
return 1;
if (width > SIZE_MAX / height)
return 0;
if (width * height > SIZE_MAX / pixel_size)
return 0;
return 1;
}
void
encheck_frame_size(int status, size_t width, size_t height, size_t pixel_size, const char *prefix, const char *fname)
{
if (!check_frame_size(width, height, pixel_size))
enprintf(status, "%s: %s%svideo frame is too large\n",
prefix ? prefix : "", (prefix && *prefix) ? " " : "", fname);
}
void
encheck_compat(int status, const struct stream *a, const struct stream *b)
{
if (a->width != b->width || a->height != b->height)
eprintf("videos do not have the same geometry\n");
if (strcmp(a->pixfmt, b->pixfmt))
eprintf("videos use incompatible pixel formats\n");
}
int
enread_frame(int status, struct stream *stream, void *buf, size_t n)
{
char *buffer = buf;
ssize_t r;
for (; stream->ptr < n; stream->ptr += (size_t)r) {
r = read(stream->fd, buffer + stream->ptr, n - stream->ptr);
if (r < 0) {
eprintf("read %s:", stream->file);
} else if (r == 0) {
if (!stream->ptr)
break;
eprintf("%s: incomplete frame", stream->file);
}
}
if (!stream->ptr)
return 0;
stream->ptr = 0;
return 1;
}
void
process_each_frame_segmented(struct stream *stream, int output_fd, const char* output_fname,
void (*process)(struct stream *stream, size_t n, size_t frame))
{
size_t frame_size, frame, r, n;
echeck_frame_size(stream->width, stream->height, stream->pixel_size, 0, stream->file);
frame_size = stream->height * stream->width * stream->pixel_size;
for (frame = 0; frame < stream->frames; frame++) {
for (n = frame_size; n; n -= r) {
if (!eread_stream(stream, n))
eprintf("%s: file is shorter than expected\n", stream->file);
r = stream->ptr - (stream->ptr % stream->pixel_size);
(process)(stream, r, frame);
ewriteall(output_fd, stream->buf, r, output_fname);
memmove(stream->buf, stream->buf + r, stream->ptr -= r);
}
}
}
void
process_two_streams(struct stream *left, struct stream *right, int output_fd, const char* output_fname,
void (*process)(struct stream *left, struct stream *right, size_t n))
{
size_t n;
echeck_compat(left, right);
for (;;) {
if (left->ptr < sizeof(left->buf) && !eread_stream(left, SIZE_MAX)) {
close(left->fd);
left->fd = -1;
break;
}
if (right->ptr < sizeof(right->buf) && !eread_stream(right, SIZE_MAX)) {
close(right->fd);
right->fd = -1;
break;
}
n = left->ptr < right->ptr ? left->ptr : right->ptr;
n -= n % left->pixel_size;
left->ptr -= n;
right->ptr -= n;
process(left, right, n);
ewriteall(output_fd, left->buf, n, output_fname);
if ((n & 3) || left->ptr != right->ptr) {
memmove(left->buf, left->buf + n, left->ptr);
memmove(right->buf, right->buf + n, right->ptr);
}
}
if (right->fd >= 0)
close(right->fd);
ewriteall(output_fd, left->buf, left->ptr, output_fname);
if (left->fd >= 0) {
for (;;) {
left->ptr = 0;
if (!eread_stream(left, SIZE_MAX)) {
close(left->fd);
left->fd = -1;
break;
}
ewriteall(output_fd, left->buf, left->ptr, output_fname);
}
}
}
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