Quantization parameter signaling in video processing

1. A computer-implemented method comprising:

receiving a bitstream comprising coded video data;

determining a first parameter of a coding block;

determining, according to the first parameter, one or more second parameters associated with a delta quantization parameter (QP) value or a chroma QP offset value; and

determining, according to the one or more second parameters, at least one of the delta QP value or the chroma QP offset value,

wherein a maximum value of the first parameter is determined based on:

a size of a luma coding tree block of a coding tree unit;

a minimum size of luma samples in a luma leaf block resulting from quadtree splitting of the coding tree unit in an intra slice or an inter slice; and

a maximum hierarchy depth of coding units resulting from multi-type tree splitting of a quadtree leaf in the intra slice or the inter slice.

2. The method according to claim 1 , wherein determining the first parameter of the coding block comprises:

determining if the coding block is associated with the intra-prediction slice or the inter prediction slice; and

in response to the coding block being associated with the intra-prediction slice, determining the first parameter to be a parameter associated with the intra-prediction slice, or

in response to the coding block being associated with the inter-prediction slice, determining the first parameter to be a parameter associated with the inter-prediction slice.

3. The method according to claim 1 , wherein the first parameter is signaled in at least one of a slice header or a picture header associated with the coding block.

4. The method according to claim 3 , wherein the coding block is associated with the intra-prediction slice, and

wherein the maximum value of the first parameter is determined according to the intra-prediction slice.

5. The method according to claim 3 , wherein the coding block is associated with the inter-prediction slice, and

wherein the maximum value of the first parameter is determined according to the inter-prediction slice.

6. The method according to claim 1 , further comprising:

determining a luma QP value based on the delta QP value;

determining a chroma QP value based on the chroma QP offset value; and

processing the coding block based on the luma QP value and the chroma QP value.

7. A system for processing video content, comprising:

a memory storing a set of instructions; and

at least one processor configured to execute the set of instructions to cause the system to perform:

receiving a bitstream comprising coded video data;

determining a first parameter of a coding block;

determining a maximum value of the first parameter based on:

a size of a luma coding tree block of a coding tree unit associated with one of an intra-prediction slice or an inter-prediction slice,

a minimum size of luma samples in a luma leaf block resulting from quadtree splitting of the coding tree unit, and

a maximum hierarchy depth of coding units resulting from multi-type tree splitting of a quadtree leaf in the intra-prediction slice or the inter-prediction slice;

determining, according to the first parameter, one or more second parameters associated with a delta quantization parameter (QP) value or a chroma QP offset value; and

determining, according to the one or more second parameters, at least one of the delta QP value or the chroma QP offset value.

8. The system according to claim 7 , wherein in determining the first parameter of the coding block, the at least one processor is configured to execute the set of instructions to cause the system to further perform:

determining if the coding block is associated with the intra-prediction slice or the inter prediction slice; and

in response to the coding block being associated with the intra-prediction slice, determining the first parameter to be a parameter associated with the intra-prediction slice, or

in response to the coding block being associated with the inter-prediction slice, determining the first parameter to be a parameter associated with the inter-prediction slice.

9. The system according to claim 7 , wherein the first parameter is signaled in at least one of a slice header or a picture header associated with the coding block.

10. The system according to claim 9 , wherein the coding block is associated with the intra-prediction slice, and

wherein the maximum value of the first parameter is determined according to the intra-prediction slice.

11. The system according to claim 9 , wherein the coding block is associated with the inter-prediction slice, and

wherein the maximum value of the first parameter is determined according to the inter-prediction slice.

12. The system according to claim 7 , wherein the at least one processor is configured to execute the set of instructions to cause the system to further perform:

determining a luma QP value based on the delta QP value;

determining a chroma QP value based on the chroma QP offset value; and

processing the coding block based on the luma QP value and the chroma QP value.

13. A non-transitory computer readable medium storing instructions that are executable by at least one processor of a computer system, wherein the execution of the instructions causes the computer system to perform a method comprising:

receiving a bitstream comprising coded video data;

determining a first parameter of a coding block;

determining a maximum value of the first parameter based on:

a size of a luma coding tree block of a coding tree unit associated with one of an intra-prediction slice or an interprediction slice,

a minimum size of luma samples in a luma leaf block resulting from quadtree splitting of the coding tree unit, and

a maximum hierarchy depth of coding units resulting from multi-type tree splitting of a quadtree leaf in the intra-prediction slice or the inter-prediction slice;

determining, according to the first parameter, one or more second parameters associated with a delta quantization parameter (QP) value or a chroma QP offset value; and

determining, according to the one or more second parameters, at least one of the delta QP value or the chroma QP offset value.

14. The non-transitory computer readable medium according to claim 13 , wherein determining the first parameter of the coding block comprises:

determining if the coding block is associated with the intra-prediction slice or the inter prediction slice; and

in response to the coding block being associated with the intra-prediction slice, determining the first parameter to be a parameter associated with the intra-prediction slice, or

in response to the coding block being associated with the inter-prediction slice, determining the first parameter to be a parameter associated with the inter-prediction slice.

15. The non-transitory computer readable medium according to claim 13 , wherein the first parameter is signaled in at least one of a slice header or a picture header associated with the coding block.

16. The non-transitory computer readable medium according to claim 15 , wherein the coding block is associated with the intra-prediction slice, and

wherein the maximum value of the first parameter is determined according to the intra-prediction slice.

17. The non-transitory computer readable medium according to claim 15 , wherein the coding block is associated with the inter-prediction slice, and

wherein the maximum value of the first parameter is determined according to the inter-prediction slice.

18. The non-transitory computer readable medium according to claim 13 , wherein the method further comprises:

determining a luma QP value based on the delta QP value;

determining a chroma QP value based on the chroma QP offset value; and

processing the coding block based on the luma QP value and the chroma QP value.