Transmission device, transmission method, reception device and reception method

1. A transmission device comprising:

circuitry configured to:

transmit a container of a predetermined format, the container including a video stream including video data and a subtitle stream including text information of a subtitle, the text information including subtitle display position information for specifying a subtitle display position as a relative position with respect to a subtitle display range, wherein the subtitle display range is an area set in a display video area for displaying the subtitle, and the display video area is a video area displayed on a monitor on a reception side;

insert, into a container of the subtitle stream, auxiliary information to be used when the subtitle is displayed by using the subtitle position information, wherein the auxiliary information includes information for determining the subtitle display range;

sequentially and repeatedly insert a predetermined number of section tables respectively including different font files into a transport stream, wherein the section tables of the predetermined number of section tables include a font downloading section table that is defined as a private section table and includes a plurality of fields; and

transmit the transport stream into which the section tables are inserted.

2. The transmission device according to claim 1 , wherein

the auxiliary information includes information regarding resizing processing of the subtitle display position determined on the basis of the subtitle display position information, the resizing processing being performed in the reception side when an aspect ratio of the video area is different from an aspect ratio of the display video area.

3. The transmission device according to claim 2 , wherein

the information regarding the resizing processing is information indicating a line position to be set as a fixed position when a size in a vertical direction is compressed in the resizing processing of the subtitle display position.

4. The transmission device according to claim 1 , wherein

the auxiliary information includes information for determining the subtitle display range.

5. The transmission device according to claim 4 , wherein

the information for determining the subtitle display range is reference point information and aspect ratio information of the subtitle display range.

6. The transmission device according to claim 1 , wherein

the circuitry is further configured to insert the auxiliary information into a packetized elementary stream (PES) packet and/or a program map table.

7. The transmission device according to claim 1 , wherein

the text information includes font specification information, and the circuitry is further configured to insert download information for downloading a file of a font specified by at least the font specification information into a container of the subtitle stream.

8. The transmission device according to claim 7 , wherein

the download information is information for acquiring a file of the font from a broadcast signal.

9. The transmission device according to claim 7 , wherein

the download information is information for acquiring a file of the font from a server on a network.

10. The transmission device according to claim 7 , wherein

the circuitry is further configured to insert the download information into a packetized elementary stream (PES) packet and/or a program map table.

11. The transmission device according to claim 1 , wherein the predetermined number of section tables includes a first section table including a font table and a plurality of second section tables each including one of the different font files.

12. The transmission device according to claim 1 , wherein the plurality of fields include a data_downloading_id field, a section_number field, and a last_section_number field.

13. The transmission device according to claim 12 , wherein the data_downloading_id field includes a plurality of values identifying each of the predetermined number of section tables, the section_number field includes a value of the plurality of values that identifies one of the predetermined number of section tables, and the last_section_number field includes a value of the plurality of values that identifies a last one of the predetermined number of section tables.

14. A reception device comprising:

circuitry configured to:

receive a container of a predetermined format, the container including a video stream including video data and a subtitle stream including text information of a subtitle, the text information including subtitle display position information for specifying a subtitle display position as a relative position with respect to a subtitle display range, wherein the subtitle display range is an area set in a display video area for displaying the subtitle, and the display video area is a video area displayed on a monitor, and wherein the video stream further includes a transport stream including a predetermined number of sequentially and repeatedly inserted section tables that respectively include different font files, wherein the section tables the predetermined number of section tables include a font downloading section table that is defined as a private section table and includes a plurality of fields; and

control processing of decoding the video stream to obtain the video data, processing of decoding the subtitle stream to obtain bitmap data of the subtitle, processing of performing display position control on the bitmap data of the subtitle on the basis of the subtitle display position acquired by using the subtitle display position information and auxiliary information to be used when the subtitle is displayed by using the subtitle position information inserted into a container of the subtitle stream, recognizing a positional relationship of the section tables to acquire the different font files of the section tables for the subtitle in one circulation, and processing of superimposing the bitmap data of the subtitle subjected to the display position control on the video data, wherein the auxiliary information is extracted from a container of the subtitle stream and includes information for determining the subtitle display range.

15. The reception device according to claim 14 , wherein

the auxiliary information includes information regarding resizing processing of the subtitle display position determined on the basis of the subtitle display position information, the resizing processing being performed in the reception side when an aspect ratio of a video area is different from an aspect ratio of a display video area, and

in the processing of performing the display position control, when the aspect ratio of the video area is different from the aspect ratio of the display video area, the display video area is set as the subtitle display range and the subtitle display position is determined on the basis of the subtitle display position information, the resizing processing is performed by using the information regarding the resizing processing on the subtitle display position determined, and the display position control is performed on the bitmap data of the subtitle on the basis of the subtitle display position subjected to the resizing processing.

16. The reception device according to claim 14 , wherein

the auxiliary information includes information for determining the subtitle display range, and

in the processing of performing the display position control, when the aspect ratio of the video area is different from the aspect ratio of the display video area, the subtitle display range is set in the display video area on the basis of the information for determining the subtitle display range, the subtitle display position is determined on the basis of the subtitle display position information, and the display position control is performed on the bitmap data of the subtitle on the basis of the subtitle display position determined.

17. The reception device according to claim 14 , wherein

the text information includes font specification information, and

the controller is further configured to control processing of acquiring a font file of a font specified by the font specification information on the basis of download information for downloading a file of the font specified by at least the font specification information inserted into the container of the subtitle stream, processing of decoding the subtitle stream and obtaining bitmap data of the subtitle on the basis of the font file acquired, and processing of superimposing the bitmap data of the subtitle on the video data.