Trellis coded quantization coefficient coding

A device for quantizing or inverse quantizing for processing video data, the device comprising processing circuitry configured to:

• code a value for a first greater than zero syntax element for a first quantized transform coefficient of a residual block of video data;
• after coding the value for the first greater than zero syntax element, code a first parity bit representing a parity for the first quantized transform coefficient;
• after coding the first parity bit, code one or more values for one or more syntax elements representing a remaining level value for the first quantized transform coefficient;
• determine a first state of a data structure, the first state representing a first quantizer applied when quantizing or inverse quantizing the first quantized transform coefficient;
• update the data structure to a second state according to the first state and the parity for the first quantized transform coefficient;
• after coding the value for the first greater than zero syntax element and the first parity bit, code a value for a second greater than zero syntax element for a second quantized transform coefficient of the residual block of video data;
• after coding the value for the second greater than zero syntax element, code a second parity bit representing a parity for the second quantized transform coefficient;
• after coding the second parity bit, code one or more values for one or more syntax elements representing a remaining level value for the second quantized transform coefficient;
• determine a second quantizer to be applied when quantizing or inverse quantizing the second quantized transform coefficient according to the second state of the data structure;
• and
• quantize or inverse quantize the second quantized transform coefficient using the second quantizer.

A device for quantizing or inverse quantizing for processing video data, the device comprising:

• means for coding a value for a first greater than zero syntax element for a first quantized transform coefficient of a residual block of video data;
• means for coding a first parity bit representing a parity for the first quantized transform coefficient after coding the value for the first greater than zero syntax element;
• means for coding one or more values for one or more syntax elements representing a remaining level value for the first quantized transform coefficient after coding the first parity bit;
• means determining a first state of a data structure, the first state representing a first quantizer applied when quantizing or inverse quantizing the first quantized transform coefficient;
• means for coding a value for a second greater than zero syntax element for a second quantized transform coefficient of the residual block of video data after coding the value for the first greater than zero syntax element and the first parity bit;
• means for coding a second parity bit representing a parity for the second quantized transform coefficient after coding the value for the second greater than zero syntax element;
• means for coding one or more values for one or more syntax elements representing a remaining level value for the second quantized transform coefficient after coding the second parity bit;
• means for updating the data structure to a second state according to the first state and the parity for the first quantized transform coefficient;
• means for determining a second quantizer to be applied when quantizing or inverse quantizing the second quantized transform coefficient according to the second state of the data structure;
• and
• means for quantizing or inverse quantizing the second quantized transform coefficient using the second quantizer.

A computer-readable storage medium having stored thereon instructions that, when executed, cause a processor to:

• code a value for a first greater than zero syntax element for a first quantized transform coefficient of a residual block of video data;
• after coding the value for the first greater than zero syntax element, code a first parity bit representing a parity for the first quantized transform coefficient;
• after coding the first parity bit, code one or more values for one or more syntax elements representing a remaining level value for the first quantized transform coefficient;
• determine a first state of a data structure, the first state representing a first quantizer applied when quantizing or inverse quantizing the first quantized transform coefficient;
• update the data structure to a second state according to the first state and the parity for the first quantized transform coefficient;
• after coding the value for the first greater than zero syntax element and the first parity bit, code a value for a second greater than zero syntax element for a second quantized transform coefficient of the residual block of video data;
• after coding the value for the second greater than zero syntax element, code a second parity bit representing a parity for the second quantized transform coefficient;
• after coding the second parity bit, code one or more values for one or more syntax elements representing a remaining level value for the second quantized transform coefficient;
• determine a second quantizer to be applied when quantizing or inverse quantizing the second quantized transform coefficient according to the second state of the data structure;
• and
• quantize or inverse quantize the second quantized transform coefficient using the second quantizer.