Transmission apparatus, transmission method, reception apparatus, and reception method
To enable satisfactory decoding processing corresponding to a decoding capability on a reception side. Image data of pictures constituting moving image data are sorted into multiple hierarchies, image data of pictures of each of the sorted hierarchies are encoded, and video data including the encoded image data of the pictures of each of the hierarchies is generated. A container of a predetermined format including the video data is transmitted. The multiple hierarchies are divided into a predetermined number of hierarchy groups, the predetermined number being two or more, and identification information for identifying a hierarchy group to which encoded image data of each picture included in the video data belongs is inserted into a packet as a container of the video data.
1. A reception apparatus, comprising:
circuitry configured to
receive a description and encoded image data on a low layer side and a high layer side, wherein
the description includes first identification information of the low layer side of the encoded image data, and second identification information of the low layer side and the high layer side of the encoded image data, and
the encoded image data on the low layer side and the high layer side includes information for identifying a layer to which the encoded image data belongs in a network abstraction layer (NAL) unit of a respective picture of the encoded image data,
on the basis of the description and a decoding capability, decode only the encoded image data on the low layer side or decode the encoded image data on the low layer side and the high layer side, and
set a frame rate of the decoded image data on the basis of a display capability.
2. The reception apparatus according to claim 1 , wherein the first identification information is a level specification value of a bit stream including the low layer side of the encoded image data, and
the second identification information is a level specification value of a bit stream including the low layer side and the high layer side of the encoded image data.
3. The reception apparatus according to claim 1 , the circuitry further configured to extract the first identification information and the second identification information from the description.
4. The reception apparatus according to claim 1 , wherein decoding intervals of pictures of the encoded image data on the low layer side of the encoded image data are equal.
5. The reception apparatus according to claim 1 , wherein the frame rate of the decoded image data is matched with the display capability.
6. The reception apparatus according to claim 1 , wherein the description and the encoded image data are received through broadcast transmission.
7. The reception apparatus according to claim 1 , wherein
the encoded image data on the low layer side comprises encoded image data on a first layer and the encoded image data on the high layer side comprises encoded image data on a second layer,
the description includes the first identification information of the first layer and includes the second identification information of the first layer and the second layer,
the circuitry is configured to decode the encoded image data on the first layer when decoding only the encoded image data on the low layer side, and
the circuitry is configured to decode the encoded image data on the first layer and the encoded image data on the second layer when decoding the encoded image data on the low layer side and the high layer side.
8. The reception apparatus according to claim 1 , wherein
the circuitry is further configured to increase the frame rate of the decoded image data from a first frame rate corresponding to the decoding capability to a second frame rate higher than the first frame rate on the basis of the display capability.
9. The reception apparatus according to claim 1 , wherein
the circuitry is further configured to increase the frame rate of the decoded image data from a first frame rate corresponding to the decoding capability to a second frame rate not exceeding the display capability.
10. The reception apparatus according to claim 1 , wherein
the circuitry is further configured to increase the frame rate of the decoded image data from a first frame rate corresponding to the decoding capability to a maximum frame rate that the reception apparatus is capable of displaying.
11. The reception apparatus according to claim 1 , wherein
the circuitry is further configured to increase the frame rate of the decoded image data from a first frame rate corresponding to the decoding capability to a second frame rate not exceeding the display capability on the basis of selection information generated according to a user operation.
12. The reception apparatus according to claim 1 , wherein
the circuitry is further configured to increase the frame rate of the decoded image data from a first frame rate corresponding to the encoded image data on the low layer side to a second frame rate corresponding to the encoded image data on the low layer side and the high layer side on the basis of the display capability when the circuitry decodes only the encoded image data on the low layer side.
13. The reception apparatus according to claim 1 , wherein
the circuitry is further configured to decrease the frame rate of the decoded image data from a first frame rate corresponding to the decoding capability to a second frame rate lower than the first frame rate on the basis of the display capability.
14. The reception apparatus according to claim 1 , further comprising a display configured to display the decoded image data in the set frame rate, wherein
the display capability corresponds to capability of the display.
15. The reception apparatus according to claim 1 , wherein, in response to the decoding the encoded image data on the low layer side and the high layer side, the decoded image data includes pictures having information identifying the low layer side and pictures having information identifying the high layer side.
16. A reception method, comprising:
receiving a description and encoded image data on a low layer side and a high layer side, wherein
the description includes first identification information of the low layer side of the encoded image data, and second identification information of the low layer side and the high layer side of the encoded image data, and
the encoded image data on the low layer side and the high layer side includes information for identifying a layer to which the encoded image data belongs in a network abstraction layer (NAL) unit of a respective picture of the encoded image data,
on the basis of the description and a decoding capability, decoding only the encoded image data on the low layer side or decoding the encoded image data on the low layer side and the high layer side, and
setting a frame rate of the decoded image data on the basis of a display capability.
17. The reception method according to claim 16 , wherein
the method further comprises increasing the frame rate of the decoded image data from a first frame rate corresponding to the decoding capability to a second frame rate higher than the first frame rate on the basis of the display capability.
18. The reception method according to claim 16 , wherein
the method further comprises increasing the frame rate of the decoded image data from a first frame rate corresponding to the decoding capability to a second frame rate not exceeding the display capability.
19. The reception method according to claim 16 , wherein
the method further comprises increasing the frame rate of the decoded image data from a first frame rate corresponding to the decoding capability to a second frame rate not exceeding the display capability on the basis of selection information generated according to a user operation.
20. A non-transitory computer-readable storage medium storing computer-readable instructions thereon, which, when executed by a reception apparatus, cause the reception apparatus to perform a method, comprising:
receiving a description and encoded image data on a low layer side and a high layer side, wherein
the description includes first identification information of the low layer side of the encoded image data, and second identification information of the low layer side and the high layer side of the encoded image data, and
the encoded image data on the low layer side and the high layer side includes information for identifying a layer to which the encoded image data belongs in a network abstraction layer (NAL) unit of a respective picture of the encoded image data,
on the basis of the description and a decoding capability, decoding only the encoded image data on the low layer side or decoding the encoded image data on the low layer side and the high layer side, and
setting a frame rate of the decoded image data on the basis of a display capability.