Transmission device, transmission method, reception device, and reception method
An image data of pictures constituting moving image data is encoded to generate an encoded video stream. In this case, the image data of the pictures constituting the moving image data is classified into a plurality of levels and encoded to generate a video stream having the image data of the pictures at the respective levels. Hierarchical composition is equalized between a low-level side and a high-level side, and corresponding pictures on the low-level side and the high-level side are combined into one set and are sequentially encoded. This allows a reception side to decode the encoded image data of the pictures on the low-level side and the high-level side with a smaller buffer size and a reduced decoding delay.
1. A reception device comprising:
circuitry configured to
receive a container including
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;
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 included in the received container to obtain the image data of the pictures constituting the moving image data; and
subject the obtained image data, in response to a determination that the obtained image data corresponds to a frame rate smaller than a frame rate corresponding to a display capability, to interpolation to increase the frame rate of the obtained image data.
2. The reception device according to claim 1 , wherein the circuitry is configured to 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 included in the received container depending on a decoding capability to obtain the image data of the pictures constituting the moving image data.
3. The reception device according to claim 2 , wherein the circuitry is configured to retrieve 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 from the video stream depending on the decoding capability based on the hierarchical information.
4. The reception device according to claim 1 , wherein the circuitry is configured to match the frame rate of the obtained image data with the display capability.
5. The reception device according to claim 1 , wherein the circuitry is configured to subject the obtained image data, in response to a determination that the obtained image data corresponds to a frame rate larger than the frame rate corresponding to the display capability, to sub sampling to decrease the frame rate of the obtained image data.
6. The reception device according to claim 1 , wherein the container is in MPEG-4 Part 14 (MP4) format.
7. The reception device according to claim 1 , wherein the circuitry is configured to display the obtained image data in the increased frame rate.
8. The reception device according to claim 7 , further comprising a display configured to display the obtained image data.
9. The reception device according to claim 8 , wherein the display is a liquid crystal display (LCD) or an organic electro-luminescence (EL) display.
10. The reception device according to claim 1 , wherein the circuitry is configured to output the obtained image data to an external device to display in the increased frame rate.
11. A reception method comprising:
receiving a container including
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;
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 included in the received container to obtain the image data of the pictures constituting the moving image data; and
subjecting the obtained image data, in response to a determination that the obtained image data corresponds to a frame rate smaller than a frame rate corresponding to a display capability, to interpolation to increase the frame rate of the obtained image data.
12. The reception method according to claim 11 , wherein the 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 included in the received container is performed depending on a decoding capability to obtain the image data of the pictures constituting the moving image data.
13. The reception method according to claim 12 , wherein the method further comprises retrieving 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 from the video stream depending on the decoding capability based on the hierarchical information.
14. The reception method according to claim 11 , wherein the method further comprises matching the frame rate of the obtained image data with the display capability.
15. The reception method according to claim 11 , wherein the method further comprises subjecting the obtained image data, in response to a determination that the obtained image data corresponds to a frame rate larger than the frame rate corresponding to the display capability, to sub sampling to decrease the frame rate of the obtained image data.
16. The reception method according to claim 11 , wherein the container is in MPEG-4 Part 14 (MP4) format.
17. The reception method according to claim 11 , wherein the method further comprises displaying the obtained image data in the increased frame rate.
18. The reception method according to claim 17 , wherein the method further comprises outputting the obtained image data to an external device to display in the increased frame rate.