Communication apparatus, communication data generation method, and communication data processing method
A configuration in which it can be determined on a packet-by-packet basis whether encoded data stored in communication packets is data based on randomly accessible encoded data is provided. A transmission apparatus generates a packet storing a NAL unit which is a component of encoded data or a packet storing NAL unit fragments obtained by further dividing the NAL unit, sets access point information indicating whether the NAL unit serving as the source data of packet storage data includes data serving as a random access point as additional information, and transmits the packet. A reception apparatus determines whether packet storage data is data generated based on randomly accessible encoded data with reference to the additional information of the packet.
1. A communication apparatus, comprising:
circuitry configured to:
generate packets storing encoded data; and
transmit the packets generated,
wherein one of the packets stores one data unit, a header of the one of the packets includes access point information indicating whether the one data unit stored in the one of the packets includes data serving as a random access point, the one of the packets is transmitted, and the data serving as the random access point includes a first byte of a first picture of an image sequence in which all states necessary for decoding a stream can be reset, wherein the one data unit is a fragment of a network abstract layer (NAL) unit.
2. The communication apparatus according to claim 1 ,
wherein the one data unit is data generated based on the NAL unit that includes encoded data designated by a streaming access point (SAP).
3. The communication apparatus according to claim 1 ,
wherein the circuitry generates media data including one or more data units serving as configuration data of a group of picture (GOP) corresponding to data units in a packet.
4. The communication apparatus according to claim 1 ,
wherein the circuitry generates a different packet storing data units and the different packet does not include access point information.
5. The communication apparatus according to claim 1 ,
wherein the circuitry generates a packet storing divisional data generated by dividing encoded data serving as a transmission target into data equal to or less than a maximum data transfer unit specified on a communication path.
6. The communication apparatus according to claim 1 ,
wherein the header is an extension header.
7. The communication apparatus according to claim 1 ,
wherein the header is a layered coding transport (LCT) header.
8. The communication apparatus according to claim 1 ,
wherein the circuitry performs broadcast delivery or multicast delivery of the one of the packets through a broadcast wave.
9. A communication apparatus, comprising:
circuitry configured to:
receive packets storing encoded data transmitted by a transmission apparatus; and
process the packets received,
wherein one of the packets stores one data unit, a header of the one of the packets includes access point information indicating whether the one data unit stored in the one of the packets includes data serving as a random access point, and the data serving as the random access point includes a first byte of a first picture of an image sequence in which all states necessary for decoding a stream can be reset, wherein the one data unit is a fragment of a network abstract layer (NAL) unit.
10. The communication apparatus according to claim 9 ,
wherein the circuitry performs a process of determining whether the one data unit is data generated based on the NAL unit including encoded data designated by streaming access point (SAP) with reference to the access point information serving as the access point information included in the header.
11. The communication apparatus according to claim 9 ,
wherein the circuitry selects and acquires data including an access point with reference to the access point information serving as the access point information included in the header and performs decoding and reproduction processes.
12. The communication apparatus according to claim 9 ,
wherein the circuitry acquires the access point information from the header.
13. The communication apparatus according to claim 9 ,
wherein
the circuitry acquires the access point information from the header that is an extension header.
14. The communication apparatus according to claim 9 ,
wherein
the circuitry acquires the access point information from the header that is a layered coding transport (LTCT) header.
15. The communication apparatus according to claim 9 ,
wherein the circuitry receives the packets through a broadcast wave.
16. A communication data generation method performed in a data transmission apparatus, comprising:
generating, by circuitry, packets storing encoded data, wherein one of the packets stores one data unit, a header of the one of the packets includes access point information indicating whether the one data unit stored in the one of the packets includes data serving as a random access point, and the data serving as the random access point includes a first byte of a first picture of an image sequence in which all states necessary for decoding a stream can be reset, wherein the one data unit is a fragment of a network abstract layer (NAL) unit; and
transmitting the one of the packets.
17. A communication data processing method performed in a data reception apparatus, comprising:
receiving, by communication circuitry, encoded data storage packets; and
receiving, by data processing circuitry, the encoded data storage packets received by the communication circuitry,
wherein one of the encoded data storage packets received by the communication circuitry is configured to store one data unit, a header of the one of the encoded data storage packets includes access point information indicating whether the one data unit stored in the one of the encoded data storage packets includes data serving as a random access point, and
the data serving as the random access point includes a first byte of a first picture of an image sequence in which all states necessary for decoding a stream can be reset, wherein the one data unit is a fragment of a network abstract layer (NAL) unit.