Apparatus for transmitting broadcast signals, apparatus for receiving broadcast signals, method for transmitting broadcast signals and method for receiving broadcast signals

A broadcast signal transmitting apparatus comprising:

• a packetizer configured to generate at least one Layered Coding Transport (LCT) packet,
• wherein the at least one LCT packet is used to transport at least one delivery object including service data for a broadcast service,
• wherein the at least one delivery object is carried in a transport session, and
• wherein the at least one LCT packet includes a header having a Transport Object Identifier (TOI) identifying a delivery object being carried in the at least one LCT packet;
• a processor configured to generate signaling information including mapping information,
• wherein the mapping information in the signaling information is used to establish a one-to-one mapping between the TOI and a uniform resource locator (URL) for the delivery object;
• and
• a transmitter configured to transmit the at least one LCT packet, and to transmit the signaling information separately from the at least one LCT packet,
• wherein the header of the at least one LCT packet further includes type information indicating whether a type of the delivery object being carried in the at least one LCT packet is a media segment type or an initialization segment type.