Data transmission method, data playback method, data transmission device, and data playback device

A data playback method comprising:

• receiving;
• a plurality of coded data units each of which is composed of a plurality of samples;
• reference clock time information indicating a reference clock time for setting a current clock time;
• and
• leading clock time information indicating a leading clock time of a clock time at which a leading sample in a coded data unit is to be presented or decoded;
• and
• playing back the plurality of coded data units,
• wherein the leading clock time information indicates respective leading clock times of a plurality of specific coded data units among the received plurality of coded data units, the plurality of specific coded data units are a plurality of coded data units which are to be presented or decoded after the leading clock time information is received,
• each of the received plurality of coded data units indicates a time point at which each of a plurality of non-leading samples sample of a plurality of samples except for the leading sample in the coded data unit is presented or decoded as a relative value to a time point of another sample in the coded data unit, and
• in the playing back, the plurality of samples included in the plurality of specific coded data units are played back so as to be presented or decoded at a time corresponding to a current clock time that is set according to the reference clock time indicated by the reference clock time information, a leading clock time of each of the plurality of specific coded data units indicated by the leading clock time information, and a relative value of each of the plurality of non-leading samples indicated by the received plurality of coded data units.

A data transmission device comprising:

• a generator that generates:
• a plurality of coded data units each of which is composed of a plurality of samples;
• reference clock time information indicating a reference clock time used to set a current clock time;
• and
• leading clock time information indicating a leading clock time of a clock time a leading sample in a coded data unit is presented or decoded;
• and
• a transmitter that transmits the generated plurality of coded data units, the generated reference clock time information, and the generated leading clock time information,
• wherein the leading clock time information indicates respective leading clock time of each of a plurality of specific coded data units among the generated plurality of coded data units, the plurality of specific coded data units are a plurality of coded data units which are to be presented or decoded after the leading clock time information is transmitted in the generated plurality of coded data units, and
• each of the generated plurality of coded data units indicates a time point at which each sample except for the leading sample in the coded data unit is presented or decoded as a relative value to a time point of another sample in the coded data unit.

A data playback device comprising:

• a receiver that receives:
• a plurality of coded data units each of which is composed of a plurality of samples;
• reference clock time information indicating a reference clock time used for setting a current clock time;
• and
• leading clock time information indicating a leading clock time that is a clock time at which a leading sample in a coded data unit is presented or decoded;
• and
• a player that plays back the plurality of coded data units,
• wherein the leading clock time information indicates respective leading clock times of a plurality of specific coded data units among the received plurality of coded data units, the plurality of specific coded data units are a plurality of coded data units which are to be presented or decoded after the leading clock time information is received,
• each of the received plurality of coded data units indicates a time point at which each of a plurality of non-leading samples sample of a plurality of samples except for the leading sample in the coded data unit is presented or decoded, as a relative value to a time point of another sample in the coded data unit, and
• the player plays back the plurality of samples included in the plurality of specific coded data units so as to be presented or decoded at a time corresponding to a current clock time that is set according to the reference clock time indicated by the reference clock time information, a leading clock time of each of the plurality of specific coded data units indicated by the leading clock time information, and a relative value of each of the plurality of non-leading samples indicated by the received plurality of coded data units.