Apparatus for transmitting broadcast signals, apparatus for receiving broadcast signals, method for transmitting broadcast signals and method for receiving broadcast signals
The present invention provides an apparatus for transmitting broadcast signals, an apparatus for receiving broadcast signals and methods for transmitting and receiving broadcast signals. A broadcast signal transmission apparatus includes a delivery object generator configured to divide a file into at least one delivery object corresponding to a part of the file, a signaling encoder configured to encode signaling information including metadata for the delivery object, the signaling information including real time information indicating whether the at least one delivery object is transmitted in real time via a unidirectional channel using at least one layered coding transport (LCT) packet, and a transmitter configured to transmit the at least one delivery object and the signaling information. It is possible to reduce a total time consumed for obtaining multimedia content and displaying the multimedia content for a user.
1. A broadcast signal transmission method, comprising:
generating, by a packetizer, a first transport packet including one or more fragments of at least one delivery object and a second transport packet including signaling data based on an ALC/LCT scheme,
wherein the first and second transport packets are carried in at least one transport session,
a header of the first transport packet includes offset information corresponding to a starting byte position of a fragment of the at least one delivery object included in the first transport packet,
the header of the first transport packet further includes Transport Object Identifier (TOI) information which is mapped to Uniform Resource Locator (URL) information for the at least one delivery object described in the signaling data,
the signaling data includes a real-time attribute representing whether the at least one delivery object transmits a real-time content, and
the header of the first transport packet further includes information related to a random access point (RAP) being included in a payload of a transport packet;
processing one or more IP packets including the first transport packet and the second transport packet to generate a broadcast signal, the processing comprising:
encoding data in the one or more IP packets to output data of one or more Data Pipes, and
interleaving data of a Data Pipe by a Time Interleaving (TI) block based on one or more virtual Forward Error Correction (FEC) blocks by a column-wise writing operation and a diagonal-wise reading operation,
wherein cells of the one or more virtual FEC blocks in the TI block are skipped during the diagonal-wise reading operation; and
transmitting, by a transmitter, the broadcast signal,
wherein the signaling data is transmitted through a different transmission session from the at least one delivery object.
2. The broadcast signal transmission method according to claim 1 , wherein the signaling data further includes priority information indicating priority of data included in the second transport packet.
3. A broadcast signal transmission apparatus, comprising:
a packetizer including a processor to generate a first transport packet including one or more fragments of at least one delivery object and a second transport packet including signaling data based on an ALC/LCT scheme,
wherein the first and second transport packets are carried in at least one transport session,
a header of the first transport packet includes offset information corresponding to a starting byte position of a fragment of the at least one delivery object included in the first transport packet,
the header of the first transport packet further includes Transport Object Identifier (TOI) information which is mapped to Uniform Resource Locator (URL) information for the at least one delivery object described in the signaling data,
the signaling data includes a real-time attribute representing whether the at least one delivery object transmits a real-time content, and
the header of the first transport packet further includes information related to a random access point (RAP) being included in a payload of a transport packet;
the processor to process one or more IP packets including the first transport packet and the second transport packet to generate a broadcast signal, wherein the processor is further configured to encode data in the one or more IP packets to output data of one or more Data Pipes, and interleave data of a Data Pipe by a Time Interleaving (TI) block based on one or more virtual Forward Error Correction (FEC) blocks by a column-wise writing operation and a diagonal-wise reading operation,
wherein cells of the one or more virtual FEC blocks in the TI block are skipped during the diagonal-wise reading operation; and
a transmitter configured to transmit the broadcast signal,
wherein the signaling data is transmitted through a different transmission session from the at least one delivery object.
4. The broadcast signal transmission apparatus according to claim 3 , wherein the signaling data further includes priority information indicating priority of data included in the second transport packet.
5. A broadcast signal receiving method, comprising:
receiving, by a tuner, a broadcast signal; and
decoding, by a decoder, the broadcast signal carrying data of one or more Data Pipes, the decoding comprising:
deinterleaving data of a Data Pipe by a Time Interleaving (TI) block based on positions of one or more virtual Forward Error Correction (FEC) blocks, wherein the data of the Data Pipe by the TI block is interleaved based on the one or more virtual FEC blocks by a column-wise writing operation and a diagonal-wise reading operation, and cells of the one or more virtual FEC blocks in the TI block are skipped during the diagonal-wise reading operation, and
decoding the deinterleaved data to output one or more IP packets including one or more transport packets packetized based on an ALC/LCT scheme,
wherein a first transport packet includes one or more fragments of at least one delivery object and a second transport packet includes signaling data,
the first and second transport packets are carried in at least one transport session,
a header of the first transport packet includes offset information corresponding to a starting byte position of a fragment of the at least one delivery object included in the first transport packet,
the header of the first transport packet further includes Transport Object Identifier (TOI) information which is mapped to Uniform Resource Locator (URL) information for the at least one delivery object described in the signaling data,
the signaling data includes a real-time attribute representing whether the at least one delivery object transmits a real-time content, and
the header of the first transport packet further includes information related to a random access point (RAP) being included in a payload of a transport packet,
wherein the signaling data is received through a different transmission session from the at least one delivery object.
6. A broadcast signal receiving apparatus, comprising:
a tuner to receive a broadcast signal; and
a decoder to decode the broadcast signal carrying data of one or more Data Pipes, the decoding comprising:
deinterleaving data of a Data Pipe by a Time Interleaving (TI) block based on positions of one or more virtual Forward Error Correction (FEC) blocks, wherein the data of the Data Pipe by the TI block is interleaved based on the one or more virtual FEC blocks by a column-wise writing operation and a diagonal-wise reading operation, and cells of the one or more virtual FEC blocks in the TI block are skipped during the diagonal-wise reading operation, and
decoding the deinterleaved data to output one or more IP packets including one or more transport packets packetized based on an ALC/LCT scheme,
wherein a first transport packet includes one or more fragments of at least one delivery object and a second transport packet includes signaling data,
the first and second transport packets are carried in at least one transport session,
a header of the first transport packet includes offset information corresponding to a starting byte position of a fragment of the at least one delivery object included in the first transport packet,
the header of the first transport packet further includes Transport Object Identifier (TOI) information which is mapped to Uniform Resource Locator (URL) information for the at least one delivery object described in the signaling data,
the signaling data includes a real-time attribute representing whether the at least one delivery object transmits a real-time content, and
the header of the first transport packet further includes information related to a random access point (RAP) being included in a payload of a transport packet,
wherein the signaling data is received through a different transmission session from the at least one delivery object.