From 4674ec0e4b833ab0d0365225ba99228df14abe87 Mon Sep 17 00:00:00 2001 From: Mattias Andrée Date: Fri, 13 Jan 2017 09:05:08 +0100 Subject: Rename to blind MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Mattias Andrée --- src/blind-cut.c | 70 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 70 insertions(+) create mode 100644 src/blind-cut.c (limited to 'src/blind-cut.c') diff --git a/src/blind-cut.c b/src/blind-cut.c new file mode 100644 index 0000000..e229cf1 --- /dev/null +++ b/src/blind-cut.c @@ -0,0 +1,70 @@ +/* See LICENSE file for copyright and license details. */ +#include "stream.h" +#include "util.h" + +#include +#include +#include +#include +#include + +USAGE("start-point (end-point | 'end') file") + +int +main(int argc, char *argv[]) +{ + struct stream stream; + size_t frame_size, start = 0, end = 0, ptr, max; + ssize_t r; + char buf[BUFSIZ]; + int to_end = 0; + + ENOFLAGS(argc != 3); + + if (!strcmp(argv[0], "end")) + eprintf("refusing to create video with zero frames\n"); + else + start = etozu_arg("the start point", argv[1], 0, SIZE_MAX); + + if (!strcmp(argv[1], "end")) + to_end = 1; + else + end = etozu_arg("the end point", argv[1], 0, SIZE_MAX); + + stream.file = argv[2]; + stream.fd = eopen(stream.file, O_RDONLY); + einit_stream(&stream); + if (to_end) + end = stream.frames; + else if (end > stream.frames) + eprintf("end point is after end of video\n"); + stream.frames = end - start; + fprint_stream_head(stdout, &stream); + efflush(stdout, ""); + echeck_frame_size(stream.width, stream.height, stream.pixel_size, 0, stream.file); + frame_size = stream.width * stream.height * stream.pixel_size; + if (stream.frames > SSIZE_MAX / frame_size) + eprintf("%s: video is too large\n", stream.file); + + if (start >= end) + eprintf("%s\n", start > end ? + "start point is after end point" : + "refusing to create video with zero frames"); + end = end * frame_size + stream.headlen; + start = start * frame_size + stream.headlen; + + posix_fadvise(stream.fd, start, end - start, POSIX_FADV_SEQUENTIAL); + for (ptr = start; ptr < end; ptr += (size_t)r) { + max = end - ptr; + max = max < sizeof(buf) ? max : sizeof(buf); + r = pread(stream.fd, buf, max, ptr); + if (r < 0) + eprintf("pread %s:", stream.file); + if (r == 0) + eprintf("%s: file is shorter than expected\n", stream.file); + ewriteall(STDOUT_FILENO, buf, (size_t)r, ""); + } + + close(stream.fd); + return 0; +} -- cgit v1.2.3-70-g09d2