diff options
Diffstat (limited to 'src/vu-cut.c')
| -rw-r--r-- | src/vu-cut.c | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/src/vu-cut.c b/src/vu-cut.c index a90f032..e229cf1 100644 --- a/src/vu-cut.c +++ b/src/vu-cut.c @@ -14,7 +14,7 @@ int main(int argc, char *argv[]) { struct stream stream; - size_t frame_size, start = 0, end = 0, ptr, max, n; + size_t frame_size, start = 0, end = 0, ptr, max; ssize_t r; char buf[BUFSIZ]; int to_end = 0; @@ -50,19 +50,19 @@ main(int argc, char *argv[]) eprintf("%s\n", start > end ? "start point is after end point" : "refusing to create video with zero frames"); - end *= frame_size; - start *= frame_size; + end = end * frame_size + stream.headlen; + start = start * frame_size + stream.headlen; - for (ptr = start; ptr < end;) { + posix_fadvise(stream.fd, start, end - start, POSIX_FADV_SEQUENTIAL); + for (ptr = start; ptr < end; ptr += (size_t)r) { max = end - ptr; - max = sizeof(buf) < max ? sizeof(buf) : max; - r = read(stream.fd, buf + ptr, max); + max = max < sizeof(buf) ? max : sizeof(buf); + r = pread(stream.fd, buf, max, ptr); if (r < 0) - eprintf("read %s:", stream.file); + eprintf("pread %s:", stream.file); if (r == 0) eprintf("%s: file is shorter than expected\n", stream.file); - ptr += n = (size_t)r; - ewriteall(STDOUT_FILENO, buf, n, "<stdout>"); + ewriteall(STDOUT_FILENO, buf, (size_t)r, "<stdout>"); } close(stream.fd); |