Method for indication of sublayer numbers in multilayered video stream

1. A method of decoding video performed by at least one processor, comprising:

identifying a maximum number of temporal sublayers that is allowed in a coded video sequence referring to a parameter set in a video parameter set (VPS) field and a sequence parameter set (SPS) field respectively, wherein when a SPS identifier field, which an identifier for an SPS for reference by other syntax elements is greater than 0, and when a first syntax element of a VPS indicates that a number of temporal sublayers is the same for all layers in each coded video sequence referring to the VPS, a value of the VPS field is equal to a value of the SPS field; and

decoding the coded video sequence based on the identified maximum number of temporal sublayers that is allowed in the coded video sequence referring to the parameter set.

2. The method of claim 1 , wherein the temporal sublayers indicate temporal scalable layers of a temporal scalable bitstream.

3. The method of claim 1 , further comprising:

identifying a maximum number of allowed layers in the coded video sequence; and

decoding the coded video sequence based on the identified maximum number of allowed layers.

4. The method of claim 1 , wherein the maximum number of temporal sublayers that is allowed in the coded video sequence is set in a field of a VPS raw byte sequence payload (RBSP).

5. The method of claim 4 , wherein the VPS RBSP includes a VPS field comprising vps_max_layers_minus1.

6. The method of claim 1 , wherein the maximum number of temporal sublayers that is allowed in the coded video sequence is set in a field of an SPS raw byte sequence payload (RBSP).

7. The method of claim 6 , wherein the SPS RBSP includes the SPS field comprising sps_max_sublayers_minus1.

8. A device comprising:

at least one memory configured to store program code; and

at least one processor configured to read the program code and operate as instructed by the program code, the program code including:

identifying code configured to cause the at least one processor to identify a maximum number of temporal sublayers that is allowed in a coded video sequence referring to a parameter set in a video parameter set (VPS) field and a sequence parameter set (SPS) field respectively, wherein when a SPS identifier field, which an identifier for an SPS for reference by other syntax elements is greater than 0, and when a first syntax element of a VPS indicates that a number of temporal sublayers is the same for all layers in each coded video sequence referring to the VPS, a value of the VPS field is equal to a value of the SPS field; and

decoding code that is configured to cause the at least one processor to decode the coded video sequence based on the identified maximum number of temporal sublayers that is allowed in the coded video sequence referring to the parameter set.

9. The device of claim 8 , wherein the temporal sublayers indicate temporal scalable layers of a temporal scalable bitstream.

10. The device of claim 8 , wherein the identifying code is further configured to cause the at least one processor to identify a maximum number of allowed layers in the coded video sequence, and wherein the decoding code is further configured to cause the at least one processor to decode the coded video sequence based on the identified maximum number of allowed layers.

11. The device of claim 8 , wherein the maximum number of temporal sublayers that is allowed in the coded video sequence is set in a field of a VPS raw byte sequence payload (RBSP).

12. The device of claim 11 , wherein the VPS RBSP includes a VPS field comprising vps_max_layers_minus1.

13. The device of claim 8 , wherein the maximum number of temporal sublayers that is allowed in the coded video sequence is set in a field of an SPS raw byte sequence payload (RBSP).

14. The device of claim 13 , wherein the SPS RBSP includes the SPS field comprising sps_max_sublayers_minus1.

15. A non-transitory computer-readable medium storing instructions, the instructions comprising: one or more instructions that, when executed by one or more processors of a device, cause the one or more processors to:

identify a maximum number of temporal sublayers that is allowed in a coded video sequence referring to a parameter set in a video parameter set (VPS) field and a sequence parameter set (SPS) field respectively, wherein when a SPS identifier field, which an identifier for an SPS for reference by other syntax elements is greater than 0, and when a first syntax element of a VPS indicates that a number of temporal sublayers is the same for all layers in each coded video sequence referring to the VPS, a value of the VPS field is equal to a value of the SPS field; and

decode the coded video sequence based on the identified maximum number of temporal sublayers that is allowed in the coded video sequence referring to the parameter set.

16. The non-transitory computer-readable medium of claim 15 , wherein the temporal sublayers indicate temporal scalable layers of a temporal scalable bitstream.

17. The non-transitory computer-readable medium of claim 15 , wherein the one or more instructions further cause the one or more processors to:

identify a maximum number of allowed layers in the coded video sequence; and

decode the coded video sequence based on the identified maximum number of allowed layers.

18. The non-transitory computer-readable medium of claim 15 , wherein the maximum number of temporal sublayers that is allowed in the coded video sequence is set in a field of a VPS raw byte sequence payload (RBSP).

19. The non-transitory computer-readable medium of claim 18 , wherein the VPS RBSP includes a VPS field comprising vps_max_layers_minus1.

20. The non-transitory computer-readable medium of claim 15 , wherein the maximum number of temporal sublayers that is allowed in the coded video sequence is set in a field of an SPS raw byte sequence payload (RBSP), wherein the SPS RBSP comprising sps_max_sublayers_minus1.