Granted Patent B2

US 12,356,017 · App. 18/510,127 · Granted Jul 8, 2025

Inventors: Zhipin Deng (Beijing, CN); Li Zhang (San Diego, CA); Ye-Kui Wang (San Diego, CA); Kai Zhang (San Diego, CA)

Assignees: BEIJING BYTEDNCE NETWORK TECHNOLOGY CO., LTD.; BYTEDANCE INC.

H04N19/70H04N19/172H04N19/188

Abstract

Claims (38)

1. A method of video processing, comprising:

performing a conversion between a video comprising one or more pictures comprising one or more slices and a bitstream of the video,

wherein the bitstream conforms to a predefined order between a position of a first network abstraction layer (NAL) unit in a picture unit carrying an adaptation parameter set (APS) information and a second NAL unit that is a last video coding layer (VCL) NAL unit in the picture unit, and

wherein the predefined order is that the first NAL unit, when present, follows the second NAL unit of the picture unit.

2. The method of claim 1 , wherein a NAL unit type of the first NAL unit is a suffix adaptation parameter set NAL unit.

3. The method of claim 2 , wherein the NAL unit type of the first NAL unit is SUFFIX_APS_NUT.

4. The method of claim 2 , wherein when i) an APS NAL unit has an APS parameters type which is equal to a scaling list APS type, ii) a value of a syntax element in an APS syntax structure specifies that one or more chroma-related APS syntax elements are not present in the APS syntax structure, and iii) a variable id is not equal to X and id % M is not equal to N, scaling list chroma-related data syntax elements are excluded from the APS syntax structure, whereby X, M and N are integers.

5. The method of claim 4 , wherein X=27.

6. The method of claim 4 , wherein M=3, N=2.

7. The method of claim 1 , wherein the conversion includes encoding the video into the bitstream.

8. The method of claim 1 , wherein the conversion includes decoding the video from the bitstream.

9. An apparatus for processing video data comprising a processor and a non-transitory memory with instructions thereon, wherein the instructions upon execution by the processor, cause the processor to:

perform a conversion between a video comprising one or more pictures comprising one or more slices and a bitstream of the video,

wherein the bitstream conforms to a predefined order between a position of a first network abstraction layer (NAL) unit in a picture unit carrying an adaptation parameter set (APS) information and a second NAL unit that is a last video coding layer (VCL) NAL unit in the picture unit, and

wherein the predefined order is that the first NAL unit, when present, follows the second NAL unit of the picture unit.

10. The apparatus of claim 9 , wherein a NAL unit type of the first NAL unit is a suffix adaptation parameter set NAL unit.

11. The apparatus of claim 10 , wherein the NAL unit type of the first NAL unit is SUFFIX_APS_NUT.

12. The apparatus of claim 10 , wherein when i) an APS NAL unit has an APS parameters type which is equal to a scaling list APS type, ii) a value of a syntax element in an APS syntax structure specifies that one or more chroma-related APS syntax elements are not present in the APS syntax structure, and iii) a variable id is not equal to X and id % M is not equal to N, scaling list chroma-related data syntax elements are excluded from the APS syntax structure, whereby X, M and N are integers.

13. A non-transitory computer-readable storage medium storing instructions that cause a processor to:

perform a conversion between a video comprising one or more pictures comprising one or more slices and a bitstream of the video,

wherein the bitstream conforms to a predefined order between a position of a first network abstraction layer (NAL) unit in a picture unit carrying an adaptation parameter set (APS) information and a second NAL unit that is a last video coding layer (VCL) NAL unit in the picture unit, and

wherein the predefined order is that the first NAL unit, when present, follows the second NAL unit of the picture unit.

14. The non-transitory computer-readable storage medium of claim 13 , wherein a NAL unit type of the first NAL unit is a suffix adaptation parameter set NAL unit, and

wherein the NAL unit type of the first NAL unit is SUFFIX_APS_NUT.

15. The non-transitory computer-readable storage medium of claim 14 , wherein when i) an APS NAL unit has an APS parameters type which is equal to a scaling list APS type, ii) a value of a syntax element in an APS syntax structure specifies that one or more chroma-related APS syntax elements are not present in the APS syntax structure, and iii) a variable id is not equal to X and id % M is not equal to N, scaling list chroma-related data syntax elements are excluded from the APS syntax structure, whereby X, M and N are integers,

wherein X=27, and

wherein M=3, N=2.

16. A method for storing a bitstream of a video, comprising:

generating the bitstream of the video comprising one or more pictures comprising one or more slices,

wherein the bitstream conforms to a predefined order between a position of a first network abstraction layer (NAL) unit in a picture unit carrying an adaptation parameter set (APS) information and a second NAL unit that is a last video coding layer (VCL) NAL unit in the picture unit, and

wherein the predefined order is that the first NAL unit, when present, follows the second NAL unit of the picture unit.

17. The method of claim 16 , wherein a NAL unit type of the first NAL unit is a suffix adaptation parameter set NAL unit, and

wherein the NAL unit type of the first NAL unit is SUFFIX_APS_NUT.

18. The method of claim 17 , wherein when i) an APS NAL unit has an APS parameters type which is equal to a scaling list APS type, ii) a value of a syntax element in an APS syntax structure specifies that one or more chroma-related APS syntax elements are not present in the APS syntax structure, and iii) a variable id is not equal to X and id % M is not equal to N, scaling list chroma-related data syntax elements are excluded from the APS syntax structure, whereby X, M and N are integers,

wherein X=27, and

wherein M=3, N=2.

19. The apparatus of claim 12 , wherein X=27.

20. The apparatus of claim 12 , wherein M=3, N=2.

Assignments (3)

Priority Claims (1)

Continuity (3)

References Cited (173)