Reception device, transmission device, and data processing method

A transmission device comprising:

• a data processing unit for generating a TTML subtitle data storage packet storing TTML (Timed Text Markup Language) subtitle data as payload of a MMT packet defined in the MMT (MPEG Media Transport) format, and a signaling message including subtitle related display control information corresponding to the TTML subtitle data;
• and
• a communication unit for transmitting the TTML subtitle data storage packet and the signaling message
• wherein the subtitle display control information includes a time mode (TMD) identifier,
• the time mode identifier is an identifier capable of identifying a mode of determining a subtitle display timing using description data of the TTML subtitle data and a mode of determining a subtitle display timing not using description data of the TTML subtitle data, and
• the data processing unit generates a signaling message including subtitle display control information enabling to selectively conduct subtitle display timing control using description data of the TTML subtitle data or subtitle display timing control not using description data of the TTML subtitle data depending on the time mode identifier;
• wherein the TTML subtitle data storage packet is a MMT packet in which one TTML subtitle data file is set as Media presentation unit (MPU) defined in the MMT format,
• wherein the data processing unit generates a signaling message in which asset-based subtitle display control information set per kind of subtitles is recorded in MMT package table (MPT) defined in the MMT format.

A data processing method performed by the reception device,

• wherein the communication unit receives a TTML subtitle data storage packet storing TTML (Timed Text Markup Language) subtitle data as payload of a MMT packet defined In the MMT (MPEG Media Transport) format, and a signaling message including subtitle display control information corresponding to the TTML subtitle data,
• the data processing unit conducts subtitle display control by use of the TTML subtitle data and the signaling message,
• the subtitle display control information includes a time mode (TMD) identifier,
• the time mode identifier is an identifier capable of identifying a mode of determining a subtitle display timing by use of description data of the TTML subtitle data and a mode of determining a subtitle display timing without the use of description data of the TTML subtitle data, and
• the data processing unit selectively conducts subtitle display timing control using description data of the TTML subtitle data or subtitle display timing control not using description data of the TTML subtitle data depending on the time mode identifier;
• wherein the signaling message is a message in which subtitle display control information is recorded in MMT package table (MPT) defined in the MMT format;
• wherein the MPT includes asset-based subtitle display control Information set per kind of subtitles, and
• the data processing unit conducts subtitle display control according to the asset-based subtitle display control information recorded in the MPT.

A data processing method performed by the transmission device,

• wherein the data processing unit generates a TTML subtitle data storage packet storing TTML (Timed Text Markup Language) subtitle data as payload of a MMT packet defined in the MMT (MPEG Media Transport) format, and a signaling message including subtitle display control information corresponding to the TTML subtitle data,
• the communication unit transmits the TTML subtitle data storage packet and the signaling message,
• the subtitle display control information includes a time mode (TMD) identifier,
• the time mode identifier is an identifier capable of identifying a mode of determining a subtitle display timing by use of description data of the TTML subtitle data and a mode of determining a subtitle display timing without the use of description data of the TTML subtitle data, and
• the data processing unit generates a signaling message including subtitle display control information enabling to selectively conduct subtitle display timing control using description data of the TTML subtitle data or subtitle display timing control not using description data of the TTML subtitle data depending on the time mode identifier;
• wherein the TTML subtitle data storage packet is a MMT packet in which one TTML subtitle data file is set as Media presentation unit (MPU) defined in the MMT format,
• wherein the data processing unit generates a signaling message in which asset-based subtitle display control information set per kind of subtitles is recorded in MMT package table (MPT) defined in the MMT format.