pktdumper.c

   1 #include <avformat.h>
   2 #include <limits.h>
   3 #include <fcntl.h>
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6 #include <string.h>
   7 #include <unistd.h>
   8
   9 #define PKTFILESUFF "_%08Ld_%02d_%010Ld_%06d_%c.bin"
  10
  11 static int usage(int ret)
  12 {
  13     fprintf(stderr, "dump (up to maxpkts) AVPackets as they are demuxed by libavformat.\n");
  14     fprintf(stderr, "each packet is dumped in its own file named like `basename file.ext`_$PKTNUM_$STREAMINDEX_$STAMP_$SIZE_$FLAGS.bin\n");
  15     fprintf(stderr, "pktdumper [-nw] file [maxpkts]\n");
  16     fprintf(stderr, "-n\twrite No file at all, only demux.\n");
  17     fprintf(stderr, "-w\tWait at end of processing instead of quitting.\n");
  18     return ret;
  19 }
  20
  21 int main(int argc, char **argv)
  22 {
  23     char fntemplate[PATH_MAX];
  24     char pktfilename[PATH_MAX];
  25     AVFormatContext *fctx;
  26     AVPacket pkt;
  27     int64_t pktnum = 0;
  28     int64_t maxpkts = 0;
  29     int dontquit = 0;
  30     int nowrite = 0;
  31     int err;
  32
  33     if ((argc > 1) && !strncmp(argv[1], "-", 1)) {
  34         if (strchr(argv[1], 'w'))
  35             dontquit = 1;
  36         if (strchr(argv[1], 'n'))
  37             nowrite = 1;
  38         argv++;
  39         argc--;
  40     }
  41     if (argc < 2)
  42         return usage(1);
  43     if (argc > 2)
  44         maxpkts = atoi(argv[2]);
  45     strncpy(fntemplate, argv[1], PATH_MAX-1);
  46     if (strrchr(argv[1], '/'))
  47         strncpy(fntemplate, strrchr(argv[1], '/')+1, PATH_MAX-1);
  48     if (strrchr(fntemplate, '.'))
  49         *strrchr(fntemplate, '.') = '\0';
  50     if (strchr(fntemplate, '%')) {
  51         fprintf(stderr, "can't use filenames containing '%%'\n");
  52         return usage(1);
  53     }
  54     if (strlen(fntemplate) + sizeof(PKTFILESUFF) >= PATH_MAX-1) {
  55         fprintf(stderr, "filename too long\n");
  56         return usage(1);
  57     }
  58     strcat(fntemplate, PKTFILESUFF);
  59     printf("FNTEMPLATE: '%s'\n", fntemplate);
  60
  61     // register all file formats
  62     av_register_all();
  63
  64     err = av_open_input_file(&fctx, argv[1], NULL, 0, NULL);
  65     if (err < 0) {
  66         fprintf(stderr, "av_open_input_file: error %d\n", err);
  67         return 1;
  68     }
  69
  70     err = av_find_stream_info(fctx);
  71     if (err < 0) {
  72         fprintf(stderr, "av_find_stream_info: error %d\n", err);
  73         return 1;
  74     }
  75
  76     av_init_packet(&pkt);
  77
  78     while ((err = av_read_frame(fctx, &pkt)) >= 0) {
  79         int fd;
  80         snprintf(pktfilename, PATH_MAX-1, fntemplate, pktnum, pkt.stream_index, pkt.pts, pkt.size, (pkt.flags & PKT_FLAG_KEY)?'K':'_');
  81         printf(PKTFILESUFF"\n", pktnum, pkt.stream_index, pkt.pts, pkt.size, (pkt.flags & PKT_FLAG_KEY)?'K':'_');
  82         //printf("open(\"%s\")\n", pktfilename);
  83         if (!nowrite) {
  84             fd = open(pktfilename, O_WRONLY|O_CREAT, 0644);
  85             write(fd, pkt.data, pkt.size);
  86             close(fd);
  87         }
  88         pktnum++;
  89         if (maxpkts && (pktnum >= maxpkts))
  90             break;
  91     }
  92
  93     while (dontquit)
  94         sleep(60);
  95
  96     return 0;
  97 }