Method for video encoding with residual and coefficients coding, computing device and non-transitory computer-readable storage medium

1. A method for video encoding, comprising:

receiving, by an encoder, a video input;

obtaining, by the encoder, a quantization parameter based on the video input;

in response to determining, by the encoder, that a transform_skip_flag is equal to 1 and a sh_ts_residual_coding_disabled_flag is equal to 0, deriving, by the encoder, a rice parameter based on at least one predefined threshold, a coding bit-depth, and the quantization parameter; and

entropy encoding, by the encoder, a video bitstream based on the rice parameter.

2. The method of claim 1 , wherein in response to determining, by the encoder, that the transform_skip_flag is equal to 1 and the sh_ts_residual_coding_disabled_flag is equal to 0, deriving, by the encoder, the rice parameter based on the at least one predefined threshold, the coding bit-depth, and the quantization parameter comprises:

in response to determining, by the encoder, that an extended_precision_processing_flag is equal to 1, the transform_skip_flag is equal to 1, and the sh_ts_residual_coding_disabled_flag is equal to 0, deriving, by the encoder, the rice parameter based on the at least one predefined threshold, the coding bit-depth, and the quantization parameter.

3. The method of claim 2 , wherein the at least one predefined threshold comprises a first predefined threshold that equals 8 and a second predefined threshold that equals to 18 or 19.

4. The method of claim 1 , wherein deriving, by the encoder, the rice parameter based on the at least one predefined threshold, the coding bit-depth, and the quantization parameter comprises:

deriving, by the encoder, a first value based on the coding bit-depth minus a first predefined threshold, wherein the at least one predefined threshold comprises the first predefined threshold and a second predefined threshold;

deriving, by the encoder, a second value based on a difference between the second predefined threshold and the quantization parameter divided by a predefined number; and

deriving, by the encoder, the rice parameter based on clipping the second value based on a minimum value and the first value.

5. The method of claim 1 , wherein deriving, by the encoder, the rice parameter based on the at least one predefined threshold, the coding bit-depth, and the quantization parameter comprises:

deriving, by the encoder, a first value based on based on a difference between the at least one predefined threshold, the coding bit-depth, and the quantization parameter divided by a predefined number; and

deriving, by the encoder, the rice parameter based on clipping the first value based on a minimum value and a maximum value.

6. The method of claim 1 , wherein deriving, by the encoder, the rice parameter based on the at least one predefined threshold, the coding bit-depth, and the quantization parameter comprises:

deriving, by the encoder, a first value based on the coding bit-depth minus a first predefined threshold, wherein the at least one predefined threshold comprises the first predefined threshold and a second predefined threshold;

deriving, by the encoder, a second value based on a difference between the second predefined threshold, the coding bit-depth, and the quantization parameter divided by a predefined number;

and

deriving, by the encoder, the rice parameter based on clipping the second value based on a minimum value and the first value.

7. The method of claim 1 , wherein deriving, by the encoder, the rice parameter based on the at least one predefined threshold, the coding bit-depth, and the quantization parameter comprises:

deriving, by the encoder, a first value based on a difference between the at least one predefined threshold and the quantization parameter divided by a predefined number; and

deriving, by the encoder, the rice parameter based on clipping the first value based on a minimum value and a maximum value.

8. The method of claim 7 , wherein the minimum value is equal to 1 and the maximum value is equal to 8.

9. A computing device, comprising:

one or more processors; and

a non-transitory computer-readable storage medium storing instructions executable by the one or more processors, wherein the one or more processors are configured to perform acts comprising:

receiving a video input;

obtaining a quantization parameter based on the video input;

in response to determining that a transform_skip_flag is equal to 1 and a sh_ts_residual_coding_disabled_flag is equal to 0, deriving a rice parameter based on at least one predefined threshold, a coding bit-depth, and the quantization parameter; and

entropy encoding a video bitstream based on the rice parameter.

10. The computing device of claim 9 , wherein in response to determining that the transform_skip_flag is equal to 1 and the sh_ts_residual_coding_disabled_flag is equal to 0, deriving the rice parameter based on the at least one predefined threshold, the coding bit-depth, and the quantization parameter comprises:

in response to determining that an extended_precision_processing_flag is equal to 1, the transform_skip_flag is equal to 1, and the sh_ts_residual_coding_disabled_flag is equal to 0, deriving the rice parameter based on the at least one predefined threshold, the coding bit-depth, and the quantization parameter;

wherein the at least one predefined threshold comprises a first predefined threshold that equals 8 and a second predefined threshold that equals to 18 or 19.

11. The computing device of claim 9 , wherein deriving the rice parameter based on the at least one predefined threshold, the coding bit-depth, and the quantization parameter comprises:

deriving a first value based on the coding bit-depth minus a first predefined threshold, wherein the at least one predefined threshold comprises the first predefined threshold and a second predefined threshold;

deriving a second value based on a difference between the second predefined threshold and the quantization parameter divided by a predefined number; and

deriving the rice parameter based on clipping the second value based on a minimum value and the first value.

12. The computing device of claim 9 , wherein deriving the rice parameter based on the at least one predefined threshold, the coding bit-depth, and the quantization parameter comprises:

deriving a first value based on based on a difference between the at least one predefined threshold, the coding bit-depth, and the quantization parameter divided by a predefined number; and

deriving the rice parameter based on clipping the first value based on a minimum value and a maximum value.

13. The computing device of claim 9 , wherein deriving the rice parameter based on the at least one predefined threshold, the coding bit-depth, and the quantization parameter comprises:

deriving a first value based on the coding bit-depth minus a first predefined threshold, wherein the at least one predefined threshold comprises the first predefined threshold and a second predefined threshold;

deriving a second value based on a difference between the second predefined threshold, the coding bit-depth, and the quantization parameter divided by a predefined number;

and

deriving the rice parameter based on clipping the second value based on a minimum value and the first value.

14. The computing device of claim 9 , wherein deriving the rice parameter based on the at least one predefined threshold, the coding bit-depth, and the quantization parameter comprises:

deriving a first value based on a difference between the at least one predefined threshold and the quantization parameter divided by a predefined number; and

deriving the rice parameter based on clipping the first value based on a minimum value and a maximum value;

wherein the minimum value is equal to 1 and the maximum value is equal to 8.