blind-split-chans.c - blind - suckless command-line video editing utility
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blind-split-chans.c (2876B)
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1 /* See LICENSE file for copyright and license details. */
2 #include "common.h"
3
4 USAGE("[-c] X-file Y-file Z-file [alpha-file]")
5
6 int
7 main(int argc, char *argv[])
8 {
9 struct stream stream;
10 char xbuf[sizeof(stream.buf)], ybuf[sizeof(xbuf)], zbuf[sizeof(xbuf)], abuf[sizeof(xbuf)];
11 int xfd, yfd, zfd, afd = -1;
12 size_t i, n, ptr, cs;
13 int all_channels = 1;
14
15 ARGBEGIN {
16 case 'c':
17 all_channels = 0;
18 break;
19 default:
20 usage();
21 } ARGEND;
22
23 if (argc != 3 && argc != 4)
24 usage();
25
26 eopen_stream(&stream, NULL);
27 CHECK_ALPHA_CHAN(&stream);
28 CHECK_N_CHAN(&stream, 4, 4);
29
30 xfd = eopen(argv[0], O_WRONLY | O_CREAT | O_TRUNC, 0666);
31 yfd = eopen(argv[1], O_WRONLY | O_CREAT | O_TRUNC, 0666);
32 zfd = eopen(argv[2], O_WRONLY | O_CREAT | O_TRUNC, 0666);
33 if (argc == 4)
34 afd = eopen(argv[3], O_WRONLY | O_CREAT | O_TRUNC, 0666);
35
36 if (DPRINTF_HEAD(xfd, stream.frames, stream.width, stream.height, stream.pixfmt) < 0)
37 eprintf("dprintf %s:", argv[0]);
38 if (DPRINTF_HEAD(yfd, stream.frames, stream.width, stream.height, stream.pixfmt) < 0)
39 eprintf("dprintf %s:", argv[1]);
40 if (DPRINTF_HEAD(zfd, stream.frames, stream.width, stream.height, stream.pixfmt) < 0)
41 eprintf("dprintf %s:", argv[2]);
42 if (afd >= 0 && DPRINTF_HEAD(afd, stream.frames, stream.width, stream.height, stream.pixfmt) < 0)
43 eprintf("dprintf %s:", argv[3]);
44
45 if (!all_channels) {
46 memset(xbuf, 0, sizeof(xbuf));
47 memset(ybuf, 0, sizeof(ybuf));
48 memset(zbuf, 0, sizeof(zbuf));
49 memset(abuf, 0, sizeof(abuf));
50 }
51
52 cs = stream.chan_size;
53 n = (stream.n_chan - (afd < 0)) * cs;
54 do {
55 for (ptr = 0; ptr + stream.pixel_size <= stream.ptr; ptr += stream.pixel_size) {
56 if (all_channels) {
57 for (i = 0; i < n; i += cs) {
58 memcpy(xbuf + ptr + i, stream.buf + ptr + 0 * cs, cs);
59 memcpy(ybuf + ptr + i, stream.buf + ptr + 1 * cs, cs);
60 memcpy(zbuf + ptr + i, stream.buf + ptr + 2 * cs, cs);
61 if (afd >= 0)
62 memcpy(abuf + ptr + i, stream.buf + ptr + 3 * cs, cs);
63 }
64 } else {
65 memcpy(xbuf + ptr + 0 * cs, stream.buf + ptr + 0 * cs, cs);
66 memcpy(ybuf + ptr + 1 * cs, stream.buf + ptr + 1 * cs, cs);
67 memcpy(zbuf + ptr + 2 * cs, stream.buf + ptr + 2 * cs, cs);
68 if (afd >= 0)
69 memcpy(abuf + ptr + 3 * cs, stream.buf + ptr + 3 * cs, cs);
70 }
71 if (afd < 0) {
72 memcpy(xbuf + ptr + n, stream.buf + ptr + 3 * cs, cs);
73 memcpy(ybuf + ptr + n, stream.buf + ptr + 3 * cs, cs);
74 memcpy(zbuf + ptr + n, stream.buf + ptr + 3 * cs, cs);
75 }
76 }
77 ewriteall(xfd, xbuf, ptr, argv[0]);
78 ewriteall(yfd, ybuf, ptr, argv[1]);
79 ewriteall(zfd, zbuf, ptr, argv[2]);
80 if (afd >= 0)
81 ewriteall(afd, abuf, ptr, argv[3]);
82 memmove(stream.buf, stream.buf + ptr, stream.ptr -= ptr);
83 } while (eread_stream(&stream, SIZE_MAX));
84 if (stream.ptr)
85 eprintf("%s: incomplete frame\n", stream.file);
86
87 close(xfd);
88 close(yfd);
89 close(zfd);
90 if (afd >= 0)
91 close(afd);
92 return 0;
93 }