Transmission device, transmission method, reception device, and reception method using hierarchical encoding to allow decoding based on device capability

A transmission method comprising:

• performing hierarchical encoding on image data of pictures constituting moving image data to generate a video stream having encoded image data on a low-level side and a high-level side;
• inserting a level specified value of the encoded image data on the low-level side and a level specified value of the video stream into a layer of the video stream;
• and
• multiplexing the video stream to obtain a container including one or more video streams;
• inserting hierarchical information including the level specified value of the encoded image data on the low-level side and the level specified value of the video stream into a table of the container, the table describing the one or more video streams included in the container;
• and
• transmitting the container comprising (i) the table describing the one or more video streams and including the hierarchical information and (ii) the generated video stream having the layer including the level specified value of the encoded image data on the low-level side and the level specified value of the video stream.

A reception device comprising:

• circuitry configured to
• receive a container containing:
• a video stream having encoded image data on a low-level side and a high-level side generated by performing hierarchical encoding on image data of pictures constituting moving image data, and
• a table describing one or more video streams included in the container, the table including hierarchical information including a level specified value of the encoded image data on the low-level side and a level specified value of the video stream, wherein
• the level specified value of the encoded image data on the low-level side and the level specified value of the video stream are inserted into a layer of the video stream;
• and
• decode the encoded image data on the low-level side or the encoded image data on both the low-level side and the high-level side contained in the received container depending on a decoding capability to obtain the image data of the pictures constituting the moving image data.

A reception method comprising:

• receiving a container containing
• a video stream having encoded image data on a low-level side and a high-level side generated by performing hierarchical encoding on image data of pictures constituting moving image data, and
• a table describing one or more video streams included in the container, the table including hierarchical information including a level specified value of the encoded image data on the low-level side and a level specified value of the video stream, wherein
• the level specified value of the encoded image data on the low-level side and the level specified value of the video stream are inserted into a layer of the video stream;
• and
• decoding the encoded image data on the low-level side or the encoded image data on both the low-level side and the high-level side contained in the received container depending on a decoding capability to obtain the image data of the pictures constituting the moving image data.