Transmission apparatus, transmission method, reception apparatus, and reception method
A transmission apparatus including: a transport stream generation unit configured to generate a transport stream in which a first transport packet containing transport media in a payload and a second transport packet containing information about the transport media in a payload, are time-division multiplexed; a transport stream transmission unit configured to transmit the transport stream to a receiver through a predetermined transmission channel; and a time information insertion unit configured to insert time information for allowing the receiver to obtain decoding time and/or presentation time into the first transport packet or the second transport packet.
1. A reception apparatus comprising:
processing circuitry configured to
receive a transport stream in which a first transport packet including a first packet header and a first payload and a second transport packet including a second packet header and a second payload are time-division multiplexed from a transmitter through a predetermined transmission path, wherein
the first payload includes a transport medium of at least one of an audio medium and a video medium,
the first packet header includes first payload type information indicating the first payload includes the transport medium,
the second payload includes information related to the transport medium and does not include the transport medium,
the second packet header includes second payload type information indicating the second payload includes the information related to the transport medium,
time information including a value of a display time of the transport medium included in the first transport packet is inserted to the information related to the transport medium in the second payload of the second transport packet and not inserted into the first transport packet,
the transport medium included in the first transport packet is configured from one or more access units,
the value of a display time is a value of a display time or a decoding time corresponding to a first access unit of the one or more access units, and a relative offset value corresponding to an absolute offset value from a decoding time to the display time corresponding to each of the access units is inserted to the second transport packet, and
the processing circuitry is further configured to process the transport medium taken out of the transport stream based on the value of a display time by extracting conversion information from the time information, and converting the relative offset value into the absolute offset value using the extracted conversion information.
2. A reception method comprising:
receiving a transport stream in which a first transport packet including a first packet header and a first payload and a second transport packet including a second packet header and a second payload are time-division multiplexed from a transmitter through a predetermined transmission path, wherein
the first payload includes a transport medium of at least one of an audio medium and a video medium,
the first packet header includes first payload type information indicating the first payload includes the transport medium,
the second payload includes information related to the transport medium and does not include the transport medium,
the second packet header includes second payload type information indicating the second payload includes the information related to the transport medium,
time information including a value of a display time of the transport medium included in the first transport packet is inserted to the information related to the transport medium in the second payload of the second transport packet and not inserted into the first transport packet,
the transport medium included in the first transport packet is configured from one or more access units,
the value of a display time is a value of a display time or a decoding time corresponding to a first access unit of the one or more access units, and a relative offset value corresponding to an absolute offset value from a decoding time to the display time corresponding to each of the access units is inserted to the second transport packet,
the reception method further comprising:
processing, using processing circuitry, the transport medium taken out of the transport stream based on the value of a display time by extracting conversion information from the time information, and converting the relative offset value into the absolute offset value using the extracted conversion information.
3. The reception apparatus according to claim 1 , wherein the conversion information includes information indicating whether the value of a display time is the value of a display time or the decoding time corresponding to the first access unit of the one or more access units.
4. The reception apparatus according to claim 1 , wherein the conversion information includes information indicating what clock is used for control.
5. The reception apparatus according to claim 1 , wherein the conversion information includes scale information for calculating a rate of the one or more access units.
6. The reception apparatus according to claim 1 , wherein the conversion information includes flag information indicating whether the first payload includes a transport medium of an audio medium or a video medium.