Transmission device, transmission method, reception device, and reception method
To allow subtitle bitmap data to be favorably superimposed onto video data on the reception side. A video stream having progressive video data is generated. A subtitle stream having progressive subtitle bitmap data is generated. A container including the video stream and the subtitle stream, in a predetermined format is transmitted. For example, the progressive subtitle bitmap data divided into top-field subtitle bitmap data and bottom-field subtitle bitmap data or not divided is present in the subtitle stream.
1. A transmission device, comprising:
processing circuitry configured to:
generate a video stream having progressive video data;
generate a subtitle stream having progressive subtitle bitmap data;
insert information into the subtitle stream, the information indicating whether (i) a progressive data block is present or (ii) a top-field data block and a bottom-field data block are present;
arrange, without division of the progressive subtitle bitmap data, the progressive subtitle bitmap data in the progressive data block included in a data segment in the subtitle stream when the information indicates the progressive data block is present, the data segment indicating a type of the progressive subtitle bitmap data, the progressive subtitle bitmap data being arranged based on the type of the progressive subtitle bitmap data; and
transmit a container including the video stream and the subtitle stream, wherein the progressive subtitle bitmap data is coded progressively,
wherein the progressive subtitle bitmap data is divided into top-field subtitle bitmap data and bottom-field subtitle bitmap data when the information indicates that the top-field data block and the bottom-field data block are present.
2. The transmission device according to claim 1 , wherein
the top-field subtitle bitmap data is arranged in the top-field data block and the bottom-field subtitle bitmap data is arranged in the bottom-field data block when the information indicates that the top-field data block and the bottom-field data block are present.
3. The transmission device according to claim 1 , wherein
the progressive subtitle bitmap data is arranged in the top-field data block or the bottom-field data block when the information indicates the top-field data block and the bottom-field data block are present.
4. The transmission device according to claim 1 , wherein the processing circuitry is further configured to
insert, into a layer of the subtitle stream, identification information indicating that, after performing coordinate transform and resolution transform on the progressive subtitle bitmap data having a first resolution, the progressive subtitle bitmap data is to be superimposed onto the progressive video data having a second resolution higher than the first resolution.
5. A transmission method, comprising:
generating a video stream having progressive video data;
generating a subtitle stream having progressive subtitle bitmap data;
inserting information into the subtitle stream, the information indicating whether (i) a progressive data block is present or (ii) a top-field data block and a bottom-field data block are present;
arranging, without dividing the progressive subtitle bitmap data, the progressive subtitle bitmap data in the progressive data block included in a data segment in the subtitle stream when the information indicates the progressive data block is present, the data segment indicating a type of the progressive subtitle bitmap data, the progressive subtitle bitmap data being arranged based on the type of the progressive subtitle bitmap data; and
transmitting a container including the video stream and the subtitle stream, wherein the progressive subtitle bitmap data is coded progressively,
wherein the progressive subtitle bitmap data is divided into top-field subtitle bitmap data and bottom-field subtitle bitmap data when the information indicates that the top-field data block and the bottom-field data block are present.
6. A reception device, comprising:
processing circuitry configured to:
receive a container including a video stream, the video stream including progressive video data and a subtitle stream that includes progressive subtitle bitmap data, the progressive subtitle bitmap data being coded progressively, information indicating whether (i) a progressive data block is present or (ii) a top-field data block and a bottom-field data block are present is inserted into the subtitle stream,
decode the video stream to acquire the progressive video data,
decode the subtitle stream to acquire the progressive subtitle bitmap data, and
acquire display video data associated with superimposition of the progressive subtitle bitmap data onto the progressive video data, wherein
the progressive subtitle bitmap data is not divided and is arranged in a progressive data block included in a data segment in the subtitle stream when the information indicates the progressive data block is present, the data segment indicating a type of the progressive subtitle bitmap data, the progressive subtitle bitmap data being arranged based on the type of the progressive subtitle bitmap data, and
the progressive subtitle bitmap data is divided into top-field subtitle bitmap data and bottom-field subtitle bitmap data when the information indicates that the top-field data block and the bottom-field data block are present.
7. The reception device according to claim 6 , wherein
the progressive subtitle bitmap data is acquired with composition of the top-field subtitle bitmap data and the bottom-field subtitle bitmap data.
8. The reception device according to claim 7 , wherein
the acquired progressive subtitle bitmap data is not divided, and is inserted in the top-field data block or the bottom-field data block when the information indicates the top-field data block and the bottom-field data block are present.
9. A reception method, comprising:
receiving a container including a video stream, the video stream including progressive video data and a subtitle stream that includes progressive subtitle bitmap data, the progressive subtitle bitmap data being coded progressively, information indicating whether (i) a progressive data block is present or (ii) a top-field data block and a bottom-field data block are present is inserted into the subtitle stream;
decoding the video stream to acquire the progressive video data;
decoding the subtitle stream to acquire the progressive subtitle bitmap data; and
acquiring display video data associated with superimposition of the progressive subtitle bitmap data onto the progressive video data, wherein
the progressive subtitle bitmap data is not divided and is arranged in a progressive data block included in a data segment in the subtitle stream when the information indicates the progressive data block is present, the data segment indicating a type of the progressive subtitle bitmap data, the progressive subtitle bitmap data being arranged based on the type of the progressive subtitle bitmap data, and
wherein the progressive subtitle bitmap data is divided into top-field subtitle bitmap data and bottom-field subtitle bitmap data when the information indicates that the top-field data block and the bottom-field data block are present.
10. The transmission device of claim 1 , wherein
the data segment is an object data segment.
11. The transmission device of claim 1 , wherein
the data segment is in a coded caption transport format.
12. The reception device of claim 6 , wherein
the data segment is an object data segment.
13. The reception device of claim 6 , wherein the data segment is in a coded caption transport format.