READ_OFFSET       246 libavcodec/dvdsubdec.c     size = READ_OFFSET(buf + (big_offsets ? 2 : 0));
READ_OFFSET       247 libavcodec/dvdsubdec.c     cmd_pos = READ_OFFSET(buf + cmd_pos);
READ_OFFSET       259 libavcodec/dvdsubdec.c         next_cmd_pos = READ_OFFSET(buf + cmd_pos + 2);