Method for combination of wrap-around offset and reference picture resampling

1. A method of encoding a video bitstream using at least one processor, the method comprising:

determining that reference picture resampling is enabled;

determining a reference picture size of a reference picture;

determining a current picture size of a current picture;

determining whether the reference picture size equals the current picture size;

based on determining that the reference picture size does not equal the current picture size, disabling wrap-around motion compensation;

based on the wrap-around motion compensation being disabled, encoding the current picture without using the wrap-around motion compensation; and

generating an encoded video bitstream based on the encoded current picture,

wherein based on a value of (CtbSizeY/MinCbSizeY+1) being less than a value of (pic_width_in_luma samples/MinCbSizeY−1), a value of pps_ref_wraparound_enabled_flag in a picture parameter set (PPS) of the encoded video bitstream is set to 0.

2. The method of claim 1 , further comprising:

based on determining that the reference picture size equals the current picture size, enabling the wrap-around motion compensation; and

based on the wrap-around motion compensation being enabled, encoding the current picture using the wrap-around motion compensation.

3. The method of claim 2 , wherein based on determining that the reference picture size equals the current picture size, a first flag included in a picture parameter set (PPS) of the encoded video bitstream is set to 1.

4. The method of claim 3 , wherein based on the first flag being set to 1, a wraparound offset value is signaled in the PPS.

5. The method of claim 4 , wherein the wraparound offset value is signaled as a number of luma samples.

6. The method of claim 1 , wherein the value of pps_ref_wraparound_enabled_flag is set to 0 based on determining that a second flag included a sequence parameter set (SPS) referenced by the PPS is set to 0.

7. The method of claim 1 , wherein the current picture size is signaled in a picture parameter set (PPS).

8. A device for encoding a video bitstream, the 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:

first determining code configured to cause the at least one processor to determine that reference picture resampling is enabled;

second determining code configured to cause the at least one processor to determine a reference picture size of a reference picture;

third determining code configured to cause the at least one processor to determine a current picture size of a current picture;

fourth determining code configured to cause the at least one processor to determine whether the reference picture size equals the current picture size;

disabling code configured to cause the at least one processor to, based on determining that the reference picture size does not equal the current picture size, disable wrap-around motion compensation;

first encoding code configured to cause the at least one processor to, based on the wrap-around motion compensation being disabled, encode the current picture without using the wrap-around motion compensation; and

generating code configured to cause the at least one processor to generate an encoded video bitstream based on the encoded current picture,

wherein based on a value of (CtbSizeY/MinCbSizeY+1) being less than a value of (pic_width_in_luma samples/MinCbSizeY−1), a value of pps_ref_wraparound_enabled_flag in a picture parameter set (PPS) of the encoded video bitstream is set to 0.

9. The device of claim 8 , further comprising:

enabling code configured to cause the at least one processor to, based on determining that the reference picture size equals the current picture size, enable the wrap-around motion compensation; and

second encoding code configured to cause the at least one processor to, based on the wrap-around motion compensation being enabled, encode the current picture using the wrap-around motion compensation.

10. The device of claim 9 , wherein based on determining that the reference picture size equals the current picture size, a first flag included in a picture parameter set (PPS) of the encoded video bitstream is set to 1.

11. The device of claim 10 , wherein based on the first flag being set to 1, a wraparound offset value is signaled in the PPS.

12. The device of claim 11 , wherein the wraparound offset value is signaled as a number of luma samples.

13. The device of claim 8 , wherein the value of pps_ref_wraparound_enabled_flag is set to 0 based on determining that a second flag included a sequence parameter set (SPS) referenced by the PPS is set to 0.

14. The device of claim 8 , wherein the current picture size is signaled in a picture parameter set (PPS).

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 for encoding a video bitstream, cause the one or more processors to:

determine that reference picture resampling is enabled;

determine a reference picture size of a reference picture;

determine a current picture size of a current picture;

determine whether the reference picture size equals the current picture size;

based on determining that the reference picture size does not equal the current picture size, disable wrap-around motion compensation;

based on the wrap-around motion compensation being disabled, encode the current picture without using the wrap-around motion compensation; and

generate an encoded video bitstream based on the encoded current picture,

wherein based on a value of (CtbSizeY/MinCbSizeY+1) being less than a value of (pic_width_in_luma_samples/MinCbSizeY−1), a value of pps_ref_wraparound_enabled_flag in a picture parameter set (PPS) of the encoded video bitstream is set to 0.

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

based on determining that the reference picture size equals the current picture size, enable the wrap-around motion compensation; and

based on the wrap-around motion compensation being enabled, encode the current picture using the wrap-around motion compensation.

17. The non-transitory computer-readable medium of claim 16 , wherein based on determining that the reference picture size equals the current picture size, a first flag included in a picture parameter set (PPS) of the encoded video bitstream is set to 1.