Decoding device of filtering reconstructed video data

1. A decoding device for filtering reconstructed video data, the decoding device comprising:

one or more processors; and

one or more non-transitory computer-readable media coupled to the one or more processors and storing one or more computer-executable instructions that, when executed by at least one of the one or more processors, cause the decoding device to:

receive an edge type variable specifying whether a vertical edge or a horizontal edge is being filtered in a current block of the reconstructed video data;

derive a maximum filter length of a deblocking filter based on the edge type variable and one or more conditions relating to at least one of a size of a transform block associated with the current block or a size of an adjacent transform block, wherein:

when the edge type variable specifies that the vertical edge is filtered, the size of the transform block associated with the current block is a width of the transform block associated with the current block and the size of the adjacent transform block is a width of the adjacent transform block; and

perform a deblocking filtering, by the deblocking filter, on the current block of the reconstructed video data based on the maximum filter length, wherein a value of a luma filtered sample of the reconstructed video data is clipped based on a position of the luma filtered sample of the reconstructed video data, and wherein the maximum filter length is set to 1 when (i) the edge type variable specifies that the horizontal edge is filtered, and (ii) a remainder of a vertical location of the horizontal edge divided by a height of a coding tree block is equal to 0.

2. The decoding device of claim 1 , wherein the maximum filter length is set to 7 when (i) the edge type variable specifies that the horizontal edge is filtered, and (ii) a height in luma samples of the transform block associated with the current block is equal to or greater than 32.

3. The decoding device of claim 2 , wherein the maximum filter length is set to 3 when (i) the edge type variable specifies that the horizontal edge is filtered, and (ii) the height in luma samples of the transform block associated with the current block is less than 32.

4. The decoding device of claim 1 , wherein the maximum filter length is set to 3 when (i) the edge type variable specifies that the horizontal edge is filtered, and (ii) a first height of the transform block associated with the current block at a chroma location in the current block and a second height of the adjacent transform block are both equal to or greater than 8.

5. The decoding device of claim 4 , wherein the maximum filter length is set to 1 when the edge type variable specifies that the horizontal edge is filtered and at least one of (i) the first height of the transform block associated with the current block at the chroma location in the current block, or (ii) the second height of the adjacent transform block, is less than 8.

6. The decoding device of claim 1 , wherein the maximum filter length is set to 7 when (i) the edge type variable specifies that the vertical edge is filtered, and (ii) a width in luma samples of the transform block associated with the current block is equal to or greater than 32.

7. The decoding device of claim 6 , wherein the maximum filter length is set to 3 when (i) the edge type variable specifies that the vertical edge is filtered, and (ii) the width in luma samples of the transform block associated with the current block is less than 32.

8. The decoding device of claim 1 , wherein the maximum filter length is set to 3 when (i) the edge type variable specifies that the vertical edge is filtered, and (ii) a first width in chroma samples of the transform block associated with the current block at a chroma location in the current block is equal to or greater than 8, and (iii) a second width in chroma samples of the adjacent transform block is equal to or greater than 8.

9. The decoding device of claim 8 , wherein the maximum filter length is set to 1 when the edge type variable specifies that the vertical edge is filtered and at least one of (i) the first width in the chroma samples of the transform block associated with the current block at the chroma location in the current block, or (ii) the second width in the chroma samples of the adjacent transform block, is less than 8.

10. The decoding device of claim 1 , wherein, when the edge type variable specifies that the horizontal edge is filtered, the size of the transform block associated with the current block is a height of the transform block associated with the current block and the size of the adjacent transform block is a height of the adjacent transform block.

11. The decoding device of claim 1 , wherein the maximum filter length is derived based on a color component variable specifying a particular color component value for the current block.

12. The decoding device of claim 1 , wherein:

receiving the edge type variable comprises receiving a tree type variable specifying whether a dual tree is used to partition the reconstructed video data, and

deriving the maximum filter length comprises deriving the maximum filter length based on the tree type variable.

13. The decoding device of claim 1 , wherein the maximum filter length for the current block identifies a maximum number of samples from the vertical edge or the horizontal edge to modify a time of performing the deblocking filtering on the current block.

14. The decoding device of claim 13 , wherein the maximum number of samples from the vertical edge or the horizontal edge to use as inputs to modify the time of performing the deblocking filtering on the current block is derived from the maximum filter length.