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 file [maxpkts]\n");
  16         return ret;
  17 }
  18
  19 int main(int argc, char **argv)
  20 {
  21         char fntemplate[PATH_MAX];
  22         char pktfilename[PATH_MAX];
  23         AVFormatContext *fctx;
  24         AVPacket pkt;
  25         int64_t pktnum = 0;
  26         int64_t maxpkts = 0;
  27         int err;
  28
  29         if (argc < 2)
  30                 return usage(1);
  31         if (argc > 2)
  32                 maxpkts = atoi(argv[2]);
  33         strncpy(fntemplate, argv[1], PATH_MAX-1);
  34         if (strrchr(argv[1], '/'))
  35                 strncpy(fntemplate, strrchr(argv[1], '/')+1, PATH_MAX-1);
  36         if (strrchr(fntemplate, '.'))
  37                 *strrchr(fntemplate, '.') = '\0';
  38         if (strchr(fntemplate, '%')) {
  39                 fprintf(stderr, "can't use filenames containing '%%'\n");
  40                 return usage(1);
  41         }
  42         if (strlen(fntemplate) + sizeof(PKTFILESUFF) >= PATH_MAX-1) {
  43                 fprintf(stderr, "filename too long\n");
  44                 return usage(1);
  45         }
  46         strcat(fntemplate, PKTFILESUFF);
  47         printf("FNTEMPLATE: '%s'\n", fntemplate);
  48
  49         // register all file formats
  50         av_register_all();
  51
  52         err = av_open_input_file(&fctx, argv[1], NULL, 0, NULL);
  53         if (err < 0) {
  54                 fprintf(stderr, "av_open_input_file: error %d\n", err);
  55                 return 1;
  56         }
  57
  58         err = av_find_stream_info(fctx);
  59         if (err < 0) {
  60                 fprintf(stderr, "av_find_stream_info: error %d\n", err);
  61                 return 1;
  62         }
  63
  64         av_init_packet(&pkt);
  65
  66         while ((err = av_read_frame(fctx, &pkt)) >= 0) {
  67                 int fd;
  68                 snprintf(pktfilename, PATH_MAX-1, fntemplate, pktnum, pkt.stream_index, pkt.pts, pkt.size, (pkt.flags & PKT_FLAG_KEY)?'K':'_');
  69                 printf(PKTFILESUFF"\n", pktnum, pkt.stream_index, pkt.pts, pkt.size, (pkt.flags & PKT_FLAG_KEY)?'K':'_');
  70                 //printf("open(\"%s\")\n", pktfilename);
  71                 fd = open(pktfilename, O_WRONLY|O_CREAT, 0644);
  72                 write(fd, pkt.data, pkt.size);
  73                 close(fd);
  74                 pktnum++;
  75                 if (maxpkts && (pktnum >= maxpkts))
  76                         break;
  77         }
  78
  79         return 0;
  80 }