libmpeg3/mpeg3peek.c

   1 #include "libmpeg3.h"
   2 #include <stdlib.h>
   3
   4
   5
   6
   7 int main(int argc, char *argv[])
   8 {
   9         mpeg3_t *file;
  10         if(argc < 3)
  11         {
  12                 printf("Usage: mpeg3peek <table of contents> <frame number>\n");
  13                 printf("Print the byte offset of a given frame.\n");
  14                 printf("Only works for video.  Requires table of contents.\n");
  15                 printf("Example: mpeg3peek heroine.toc 123\n");
  16                 exit(1);
  17         }
  18
  19         int error = 0;
  20         file = mpeg3_open(argv[1], &error);
  21         if(file)
  22         {
  23                 if(!mpeg3_total_vstreams(file))
  24                 {
  25                         printf("Need a video stream.\n");
  26                         exit(1);
  27                 }
  28
  29                 if(!file->vtrack[0]->total_frame_offsets)
  30                 {
  31                         printf("Zero length track.  Did you load a table of contents?\n");
  32                         exit(1);
  33                 }
  34
  35                 int frame_number = atoi(argv[2]);
  36                 if(frame_number < 0) frame_number = 0;
  37                 if(frame_number > file->vtrack[0]->total_frame_offsets)
  38                         frame_number = file->vtrack[0]->total_frame_offsets - 1;
  39                 printf("frame=%d offset=0x%llx\n",
  40                         frame_number,
  41                         file->vtrack[0]->frame_offsets[frame_number]);
  42         }
  43 }