blind-disperse.c - blind - suckless command-line video editing utility
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       ---
       blind-disperse.c (1378B)
       ---
            1 /* See LICENSE file for copyright and license details. */
            2 #include "common.h"
            3 
            4 USAGE("(file frames) ...")
            5 
            6 int
            7 main(int argc, char *argv[])
            8 {
            9         struct stream stream;
           10         size_t *frames, *framecount, period = 0, parts, i, n;
           11         int *fds;
           12 
           13         UNOFLAGS(argc % 2 || !argc);
           14 
           15         eopen_stream(&stream, NULL);
           16 
           17         parts      = (size_t)argc / 2;
           18         frames     = alloca(parts * sizeof(*frames));
           19         framecount = alloca(parts * sizeof(*framecount));
           20         fds        = alloca(parts * sizeof(*fds));
           21 
           22         for (i = 0; i < parts; i++) {
           23                 fds[i] = eopen(argv[i * 2], O_WRONLY | O_CREAT | O_TRUNC, 0666);
           24                 frames[i] = etozu_arg("frames", argv[i * 2 + 1], 1, SIZE_MAX);
           25         }
           26         for (i = 0; i < parts; i++) {
           27                 if (frames[i] > SIZE_MAX - period)
           28                         eprintf("the sum of selected frame intervals exceeds %zu\n", SIZE_MAX);
           29                 period += frames[i];
           30         }
           31         for (n = stream.frames / period, i = 0; i < parts; i++)
           32                 framecount[i] = n * frames[i];
           33         for (n = stream.frames % period, i = 0; i < parts; i++) {
           34                 framecount[i] += MIN(n, frames[i]);
           35                 n -= MIN(n, frames[i]);
           36         }
           37 
           38         for (i = 0; i < parts; i++)
           39                 if (DPRINTF_HEAD(fds[i], framecount[i], stream.width, stream.height, stream.pixfmt) < 0)
           40                         eprintf("dprintf %s:", argv[i * 2]);
           41         for (i = 0; i < parts; i++, i = i == parts ? 0 : i)
           42                 if (esend_frames(&stream, fds[i], frames[i], argv[i * 2]) != frames[i])
           43                         break;
           44         for (i = 0; i < parts; i++)
           45                 close(fds[i]);
           46 
           47         return 0;
           48 }