Decoding device for decoding a coded video in a system stream with a transfer characteristic if the transfer characteristic is provided in the system stream
Provided is a video reception method performed by a video reception apparatus including a display. The video reception method includes: receiving a reception signal multiplexed from a video signal and an audio signal; obtaining the video signal and first transfer characteristics information by demultiplexing the reception signal, the first transfer characteristics information being information for specifying, per random access unit, a transfer function corresponding to a luminance dynamic range of the video signal; obtaining video data by decoding the video signal obtained; and displaying the video data while controlling a luminance dynamic range of the display per random access unit according to the first transfer characteristics information.
1. A decoding method, performed by a decoding device, comprising:
receiving a system stream including a coded video and a first parameter, the first parameter indicating first transfer characteristics provided to decode the coded video;
reading a first flag included in the system stream, the first flag indicating whether a second parameter is provided in the system stream to define second transfer characteristics;
decoding the coded video with the second transfer characteristics if the second parameter is provided in the system stream; and
decoding the coded video with the first transfer characteristics if the second parameter is not provided in the system stream, wherein
each of the first transfer characteristics and the second transfer characteristics relates to optical-electro conversion or electro-optical conversion,
the system stream is generated according to an MPEG Media Transport (MMT) scheme,
the second parameter is provided per Media Processing Unit (MPU) which is defined in the MMT scheme and which is a random access unit,
the first flag is provided in the system stream per program, each of a plurality of programs including a plurality of MPUs, and
when the first flag for a program included in the plurality of programs indicates that the second parameter is provided in the system stream, a coded video corresponding to an MPU from among the plurality of MPUs included in the program is decoded with second transfer characteristics indicated by a second parameter provided for the MPU corresponding to the coded video.
2. The decoding method according to claim 1 , wherein the second transfer characteristics supports a High Dynamic Range.
3. The decoding method according to claim 1 , wherein the second parameter is provided in a leading access unit in the MPU.
4. The decoding method according to claim 1 , wherein the first flag is provided in a layer other than a video coding layer in which the coded video is provided.
5. The decoding method according to claim 4 , wherein the layer corresponds to MMT-specific information (MMT-SI).
6. A decoding device comprising:
a receiver configured to receive a system stream including a coded video and a first parameter, the first parameter indicating first transfer characteristics provided to decode the coded video; and
a signal processor configured to:
read a first flag included in the system stream, the first flag indicating whether a second parameter is provided in the system stream to define second transfer characteristics;
decode the coded video with the second transfer characteristics if the second parameter is provided in the system stream; and
decode the coded video with the first transfer characteristics if the second parameter is not provided in the system stream, wherein
each of the first transfer characteristics and the second transfer characteristics relates to optical-electro conversion or electro-optical conversion,
the system stream is generated according to an MPEG Media Transport scheme,
the second parameter is provided per Media Processing Unit (MPU) which is defined in the MMT scheme and which is a random access unit,
the first flag is provided in the system stream per program, each of a plurality of programs including a plurality of MPUs, and
when the first flag for a program included in the plurality of programs indicates that the second parameter is provided in the system stream, a coded video corresponding to an MPU from among the plurality of MPUs included in the program is decoded with second transfer characteristics indicated by a second parameter provided for the MPU corresponding to the coded video.
7. The decoding device according to claim 6 , wherein the second transfer characteristics supports a High Dynamic Range.
8. The decoding device according to claim 6 , wherein the second parameter is provided in a leading access unit in the MPU.
9. The decoding device according to claim 6 , wherein the first flag is provided in a layer other than a video coding layer in which the coded video is provided.
10. The decoding device according to claim 9 , wherein the layer corresponds to MMT-specific information (MMT-SI).