Transmitting system, multiplexing apparatus, and leap second correction method

A multiplexing apparatus comprising:

• an extractor configured to extract first integer second time information from a Network Time Protocol (NTP) short format timestamp added to an MPEG Media Transport Protocol (MMTP) packet;
• a controller configured to acquire information relating to a leap second processing and second integer second time information corresponding to a discontinuity occurrence time that occurred due to leap second correction, based on information concerning a leap second included in an NTP packet and time information acquired based on an NTP;
• a determiner configured to determine whether the first integer second time information matches the second integer second time information;
• a management information generator configured to generate, in response to a determination that the first integer second time information matches the second integer second time information, matching information indicating the match and identification information relating to the leap second processing;
• a continuity determiner configured to determine whether the MMTP packet is close to an MMTP packet in which an NTP short format timestamp value is discontinuous, based on the matching information, the identification information, and a difference between a value of the NTP short format timestamp and the time information acquired based on the NTP;
• and
• a transmission timing adjuster configured to adjust a transmission timing of a MMTP packet, wherein the transmission timing adjuster writes, for adjustment of a transmission timing of the MMTP packet being close to the MMTP packet in which the NTP short format timestamp value is discontinuous, time information taking the leap second processing into consideration, to the NTP short format timestamp of the MMTP packet.

A leap second correction method, comprising:

• extracting first integer second time information from a Network Time Protocol (NTP) short format timestamp added to an MPEG Media Transport Protocol (MMTP) packet;
• acquiring information relating to a leap second processing and second integer second time information corresponding to a discontinuity occurrence time occurred due to leap second correction, based on information concerning a leap second included in an NTP packet and time information acquired based on an NTP;
• determining whether the first integer second time information matches the second integer second time information;
• generating, in response to a determination that the first integer second time information matches the second integer second time information, matching information indicating the match and identification information relating to the leap second processing;
• determining whether the MMTP packet is close to an MMTP packet in which an NTP short format timestamp value is discontinuous, based on the matching information, the identification information, and a difference between a value of the NTP short format timestamp and the time information acquired based on the NTP;
• and
• writing, for adjustment of a transmission timing of the MMTP packet being close to the MMTP packet in which the NTP short format timestamp value is discontinuous, time information taking the leap second processing into consideration, to the NTP short format timestamp of the MMTP packet.