Binarization in transform skip residual coding

A method of generating a bitstream of encoded video data, the method comprising:

• determining that a block of video data is encoded without transforming residual data for the block;
• determining a level for a quantized residual value of the block of video data;
• determining a quantization parameter for the block of video data;
• based on the determined quantization parameter, determining a range for levels of quantized residual values of the block of video data;
• dividing the range into k intervals, wherein k is an integer value;
• determining a particular interval of the k intervals that includes the level for the quantized residual value;
• determining a difference value, wherein the difference value represents a difference between a reference level value for the particular interval and the level for the quantized residual value of the block of video data;
• and
• signaling the level for the quantized residual value of the block of video data based on the k intervals, wherein signaling the level for the quantized residual value of the block of video data based on the k intervals comprises:
• generating, for inclusion in the bitstream of encoded video data, one or more syntax elements indicating the particular interval;
• generating, for inclusion in the bitstream of encoded video data, a syntax element indicating the difference value;
• and
• outputting the bitstream of encoded video data.

A device for decoding video data, the device comprising:

• a memory configured to store video data;
• and
• one or more processors configured to:
• determine that a block of video data is encoded without transforming residual data for the block;
• determine a quantization parameter for the block of video data;
• based on the determined quantization parameter, determine a range for levels of quantized residual values of the block of video data;
• divide the range into k intervals, wherein k is an integer value;
• determine a level for a quantized residual value of the block of video data based on the k intervals, wherein to determine the level for the quantized residual value of the block of video data based on the k intervals, the one or more processors are further configured to:
• receive information indicating the level for the quantized residual value is within a particular interval of the k intervals;
• receive information indicating a difference value, wherein the difference value represents a difference between a reference level value for the particular interval and the level for the quantized residual value of the block of video data;
• and
• based on the reference level value and the difference value, determine the level for the quantized residual value;
• and
• output decoded video data based on the level for the quantized residual value.

A device for encoding video data, the device comprising:

• a memory configured to store video data;
• and
• one or more processors configured to:
• determine that a block of video data is encoded without transforming residual data for the block;
• determine a level for a quantized residual value of the block of video data;
• determine a quantization parameter for the block of video data;
• based on the determined quantization parameter, determine a range for levels of quantized residual values of the block of video data;
• divide the range into k intervals, wherein k is an integer value;
• determine a particular interval of the k intervals that includes the level for the quantized residual value;
• determine a difference value, wherein the difference value represents a difference between a reference level value for the particular interval and the level for the quantized residual value of the block of video data;
• signal the level for the quantized residual value of the block of video data based on the k intervals, wherein to signal the level for the quantized residual value of the block of video data based on the k intervals the one or more processors are further configured to:
• generate, for inclusion in the bitstream of encoded video data, one or more syntax elements indicating the particular interval;
• generate, for inclusion in the bitstream of encoded video data, a syntax element indicating the difference value;
• and
• output the bitstream of encoded video data.

A computer readable storage medium storing instructions that when executed by one or more processors cause the one or more processors to

• determine that a block of video data is encoded without transforming residual data for the block;
• determine a quantization parameter for the block of video data;
• based on the determined quantization parameter, determine a range for levels of quantized residual values of the block of video data;
• divide the range into k intervals, wherein k is an integer value;
• determine a level for a quantized residual value of the block of video data based on the k intervals, wherein to determine the level for the quantized residual value of the block of video data based on the k intervals, the instructions cause the one or more processors to:
• receive information indicating the level for the quantized residual value is within a particular interval of the k intervals;
• receive information indicating a difference value, wherein the difference value represents a difference between a reference level value for the particular interval and the level for the quantized residual value of the block of video data;
• and
• based on the reference level value and the difference value, determine the level for the quantized residual value;
• and
• output decoded video data based on the level for the quantized residual value.

An apparatus for decoding video data, the apparatus comprising:

• means for determining that a block of video data is encoded without transforming residual data for the block;
• means for determining a quantization parameter for the block of video data;
• means for determining a range for levels of quantized residual values of the block of video data based on the determined quantization parameter;
• means for dividing the range into k intervals, wherein k is an integer value;
• means for determining a level for a quantized residual value of the block of video data based on the k intervals, wherein the means for determining the level for the quantized residual value of the block of video data based on the k intervals comprises:
• means for receiving information indicating the level for the quantized residual value is within a particular interval of the k intervals;
• means for receiving information indicating a difference value, wherein the difference value represents a difference between a reference level value for the particular interval and the level for the quantized residual value of the block of video data;
• and
• means for determining the level for the quantized residual value based on the reference level value and the difference value;
• and
• means for outputting decoded video data based on the level for the quantized residual value.