Encoding device and encoding method, decoding device and decoding method, and program

Abstract

There is provided a decoding device including at least one circuit configured to acquire one or more encoded audio signals including a plurality of channels and/or a plurality of objects and priority information for each of the plurality of channels and/or the plurality of objects, and to decode the one or more encoded audio signals according to the priority information.

1 . A decoding device comprising:
 at least one circuit configured to:   acquire one or more encoded audio signals including a plurality of channels and/or a plurality of objects and priority information for each of the plurality of channels and/or the plurality of objects; and   decode the one or more encoded audio signals according to the priority information.   
     
     
         2 . The decoding device according to  claim 1 , wherein the at least one circuit is configured to decode according to the priority information at least in part by decoding at least one of the one or more encoded audio signals for which a priority degree indicated by the priority information is equal to or higher than a degree, and refraining from decoding at least one other of the one or more encoded audio signals for which a priority degree indicated by the priority information is less than the degree. 
     
     
         3 . The decoding device according to  claim 2 , wherein the at least one circuit is configured to change the degree based at least in part on the priority information for the plurality of channels and/or the plurality of objects. 
     
     
         4 . The decoding device according to  claim 1 , wherein:
 the at least one circuit is configured to acquire a plurality of sets of priority information for the one or more encoded audio signals, and wherein the at least one circuit is configured to decode the one or more encoded audio signals at least in part by selecting one of the sets of priority information and decoding based at least in part on the one set of priority information.   
     
     
         5 . The decoding device according to  claim 4 , wherein the at least one circuit is configured to select the one of the sets of priority information according to a calculation capability of the decoding device. 
     
     
         6 . The decoding device according to  claim 1 , wherein the at least one circuit is further configured to generate the priority information based at least in part on the encoded audio signal. 
     
     
         7 . The decoding device according to  claim 6 , wherein the at least one circuit is configured to generate the priority information based at least in part on a sound pressure or a spectral shape of the audio of the one or more encoded audio signals. 
     
     
         8 . The decoding device according to  claim 1 , wherein:
 the priority information for the plurality of channels and/or the plurality of objects comprises, for at least one first channel of the plurality of channels and/or at least one first object of the plurality of objects, priority information indicating different priority degrees of the at least one first channel and/or at least one first object over a period of time; and   the at least one circuit is configured to decode based on the priority information at least in part by determining, for the first channel and/or the first object and at a first time during the period of time, whether or not to decode the first channel and/or the first object at the first time based at least in part on a priority degree for the first channel and/or the first object at the first time and a priority degree for the first channel and/or the first object at another time before or after the first time and during the period of time.   
     
     
         9 . The decoding device according to  claim 1 , wherein the at least one circuit is further configured to:
 generate an audio signal for a first time at least in part by adding an output audio signal for a channel or object at the time and an output audio signal of the channel or object at a second time before or after the first time, wherein the output audio signal for the channel or object for a time is a signal obtained by the at least one circuit as a result of decoding in a case where decoding of the channel or object for the time is performed and is zero data in a case where decoding of the channel or object for the time is not performed; and   perform a gain adjustment of the output audio signal of the channel or object at the time based on the priority information of the channel or object at the time and the priority information of the channel or object at the other time before or after the time.   
     
     
         10 . The decoding device according to  claim 9 , wherein the at least one circuit is further configured to:
 adjust a gain of a high frequency power value for the channel or object based on the priority information of the channel or object at the first time and the priority information of the channel or object at the second time before or after the first time, and   generate a high frequency component of the audio signal for the first time based on the high frequency power value of which the gain is adjusted and the audio signal of the time.   
     
     
         11 . The decoding device according to  claim 9 , wherein the at least one circuit is further configured to:
 generate, for each channel or each object, an audio signal of the first time in which a high frequency component is included, based on a high frequency power value and the audio signal of the time,   perform the gain adjustment of the audio signal of the first time in which the high frequency component is included.   
     
     
         12 . The decoding device according to  claim 1 , wherein the at least one circuit is further configured to assign an audio signal of a first object, of the plurality of objects, to each of at least some of the plurality of channels with a gain value based on the priority information and to generate the audio of each of the plurality of channels. 
     
     
         13 . A decoding method comprising:
 acquiring priority information for each of a plurality of channels and/or a plurality of objects of one or more encoded audio signals; and   decoding the plurality of channels and/or the plurality of objects according to the priority information.   
     
     
         14 . At least one non-transitory computer-readable storage medium having encoded thereon executable instructions that, when executed by at least one processor, cause the at least one processor to carry out a method comprising:
 acquiring priority information for each of a plurality of channels and/or a plurality of objects of one or more encoded audio signals; and   decoding the plurality of channels and/or the plurality of objects according to the priority information.   
     
     
         15 . An encoding device comprising:
 at least one circuit configured to:   generate priority information for each of a plurality of channels and/or a plurality of objects of an audio signal; and   store the priority information in a bit stream.   
     
     
         16 . The encoding device according to  claim 15 , wherein the at least one circuit is configured to generate the priority information at least in part by generating a plurality of sets of priority information for each of the plurality of channels and/or plurality of objects. 
     
     
         17 . The encoding device according to  claim 16 , wherein the at least one circuit is configured to generate the plurality of sets of priority information for each of a plurality of calculation capabilities of decoding devices. 
     
     
         18 . The encoding device according to  claim 15 , wherein the at least one circuit is configured to generate the priority information based at least in part on a sound pressure or a spectral shape of the audio signal. 
     
     
         19 . The encoding device according to  claim 15 , wherein:
 the at least one circuit is further configured to encode audio signals of the plurality of channels and/or the plurality of objects of the audio signal to form an encoded audio signal; and   the at least one circuit is further configured to store the priority information and the encoded audio signal in the bit stream.   
     
     
         20 . An encoding method comprising:
 generating priority information for each of a plurality of channels and/or a plurality of objects of an audio signal; and   storing the priority information in a bit stream.   
     
     
         21 . At least one non-transitory computer-readable storage medium having encoded thereon executable instructions that, when executed by at least one processor, cause the at least one processor to carry out a method comprising:
 generating priority information for each of a plurality of channels and/or a plurality of objects of an audio signal; and   storing the priority information in a bit stream.