blind-split.c (1622B)
1 /* See LICENSE file for copyright and license details. */ 2 #include "common.h" 3 4 USAGE("[-L] (file (end-point | 'end')) ...") 5 6 int 7 main(int argc, char *argv[]) 8 { 9 struct stream stream; 10 size_t *ends, i, parts, n; 11 char *to_end; 12 FILE *fp; 13 int fd, unknown_length = 0; 14 15 ARGBEGIN { 16 case 'L': 17 unknown_length = 1; 18 break; 19 default: 20 usage(); 21 } ARGEND; 22 23 if (argc % 2 || !argc) 24 usage(); 25 26 eopen_stream(&stream, NULL); 27 echeck_dimensions(&stream, WIDTH | HEIGHT, NULL); 28 29 parts = (size_t)argc / 2; 30 ends = alloca(parts * sizeof(*ends)); 31 to_end = alloca(parts); 32 33 for (i = 0; i < parts; i++) { 34 if ((to_end[i] = !strcmp(argv[i * 2 + 1], "end"))) 35 ends[i] = unknown_length ? SIZE_MAX : stream.frames; 36 else if (tozu(argv[i * 2 + 1], 0, SIZE_MAX, ends + i)) 37 eprintf("the end point must be an integer in [0, %zu]\n", SIZE_MAX); 38 39 if (i && ends[i] <= ends[i - 1]) 40 eprintf("the end points must be in strictly ascending order\n"); 41 if (!unknown_length && ends[i] > stream.frames) 42 eprintf("frame %zu is beyond the end of the video\n", ends[i]); 43 } 44 45 for (i = 0; i < parts; i++) { 46 fd = eopen(argv[i * 2], O_WRONLY | O_CREAT | O_TRUNC, 0666); 47 if (!(fp = fdopen(fd, "wb"))) 48 eprintf("fdopen %s:", argv[i * 2]); 49 50 n = ends[i] - (i ? ends[i - 1] : 0); 51 stream.frames = (to_end[i] && unknown_length) ? 0 : n; 52 fprint_stream_head(fp, &stream); 53 efflush(fp, argv[i * 2]); 54 55 if (esend_frames(&stream, fd, n, argv[i * 2]) != n) 56 if (!unknown_length || !to_end[i]) 57 eprintf("%s: file is shorter than expected\n", stream.file); 58 59 if (fclose(fp)) 60 eprintf("%s:", argv[i * 2]); 61 close(fd); 62 } 63 64 return 0; 65 }