Transmission device, transmission method, reception device, and reception method

A reception device, comprising:

• processing circuitry configured to:
• receive a container in a predetermined format having a predetermined number of audio streams containing multiple groups of encoded data,
• extract audio streams including groups to be decoded from the predetermined number of audio streams,
• obtain one audio stream that integrates all the extracted audio streams,
• generate a command for specifying a particular group to be decoded among a predetermined number of groups included in the one audio stream,
• insert, after receiving the container but before performing decoding processing, the generated command into the obtained one audio stream to generate a modified one audio stream,
• and
• perform the decoding processing on encoded data of the particular group specified by the generated command among a predetermined number of groups included in the modified one audio stream.

A reception method, comprising:

• receiving, by receiver circuitry, a container of a predetermined format having a predetermined number of audio streams containing a plurality of groups of encoded data;
• extracting all audio streams including groups to be decoded from the predetermined number of audio streams and obtaining a single audio stream by integrating all the extracted audio streams,
• generating a command for specifying a particular group to be decoded among a predetermined number of groups included in the single audio stream:
• inserting, after receiving the container but before performing decoding, the command generated by the generating into one audio stream obtained by the obtaining to generate a modified one audio stream;
• and
• inputting the modified one audio stream in which the command is inserted to a decoder that decodes encoded data of the particular group specified by the command among a predetermined number of groups included in the modified one audio stream.