Apparatus and method for transmitting/receiving processes of a broadcast signal
A broadcast transmission apparatus is disclosed. The broadcast transmission apparatus includes a delivery object generator configured to generate at least one Delivery Object which is included in a content component of a service and recovered individually, a signaling information generator configured to generate signaling information providing discovery and acquisition of the service and the content component, and a transmitter configured to transmit the at least one Delivery Object and the signaling information through a unidirectional channel.
1. A broadcast reception apparatus comprising:
a packet receiver configured to receive transport packets carrying signaling data through a dedicated transport session, and receive transport packets carrying a delivery object through other transport sessions, wherein the delivery object is a part of a file for a broadcast service;
a signaling parser configured to extract the signaling data including session description information and an extended file delivery table providing information about delivery of the file; and
a data processor configured to:
recover the delivery object based on the signaling data, and
derive location information for the file by substituting file template information included in the extended file delivery table with a Transport Object Identifier (TOI) in a header of one transport packet among the transport packets carrying the delivery object,
wherein a payload of the one transport packet carries a contiguous portion of the delivery object starting from a beginning of a byte indicated by first byte information through a beginning of a byte indicated by a sum of the first byte information and second byte information, and
wherein the first byte information is a start offset information value in the header of the one transport packet, and the second byte information is a length of the payload computed by subtracting a size of the header from a total length of the one transport packet.
2. The broadcast reception apparatus according to claim 1 , wherein the start offset information value indicates a starting byte position of the contiguous portion of the delivery object carried in the one transport packet.
3. The broadcast reception apparatus according to claim 1 , wherein the signaling data and the delivery object are delivered via separate transport sessions.
4. The broadcast reception apparatus according to claim 1 , wherein, to recover the delivery object, the data processor is further configured to:
determine the delivery object associated with the payload of the one transport packet based on the signaling data and the TOI in the header of the one transport packet,
allocate buffer space based on a maximum transport size of the delivery object indicated by the extended file delivery table, and
copy the payload into the buffer space reserved for the delivery object.
5. A broadcast reception method comprising:
receiving, by a broadcast reception apparatus, transport packets carrying signaling data through a dedicated transport session;
receiving, by the broadcast reception apparatus, transport packets carrying a delivery object through other transport sessions, wherein the delivery object is a part of a file for a broadcast service;
extracting, by the broadcast reception apparatus, the signaling data including session description information and an extended file delivery table providing information about delivery of the file;
recovering, by the broadcast reception apparatus, the delivery object based on the signaling data; and
deriving, by the broadcast reception apparatus, location information for the file by substituting file template information included in the extended file delivery table with a Transport Object Identifier (TOI) in a header of one transport packet among the transport packets carrying the delivery object,
wherein a payload of the one transport packet carries a contiguous portion of the delivery object starting from a beginning of a byte indicated by first byte information through a beginning of a byte indicated by a sum of the first byte information and second byte information, and
wherein the first byte information is a start offset information value in the header of the one transport packet, and the second byte information is a length of the payload computed by subtracting a size of the header from a total length of the one transport packet.
6. The broadcast reception method according to claim 5 , wherein the start offset information value indicates a starting byte position of the contiguous portion of the delivery object carried in the one transport packet.
7. The broadcast reception method according to claim 5 , wherein the signaling data and the delivery object are delivered via separate transport sessions.
8. The broadcast reception method according to claim 5 , wherein the recovering of the delivery object further comprises:
determining the delivery object associated with the payload of the one transport packet based on the signaling data and the TOI in the header of the one transport packet;
allocating buffer space based on a maximum transport size of the delivery object indicated by the extended file delivery table; and
copying the payload into the buffer space reserved for the delivery object.