Quantization matrix and deblocking filter adjustments for video coding

A device for coding video data, the device comprising:

• a memory configured to store video data;
• and
• a video coder configured to:
• inverse quantize a first block of quantized transform coefficients for a first block of video data to produce a first block of transform coefficients, comprising inverse transforming the first block of quantized transform coefficients using a first quantization parameter (QP) for the first block of video data and a first quantization matrix for the first block of video data;
• inverse transform the first block of transform coefficients to produce a first residual block for the first block of video data;
• decode the first block of video data using the first residual block to form a first decoded block of video data;
• inverse quantize a second block of quantized transform coefficients for a second block of video data to produce a second block of transform coefficients, comprising inverse transforming the second block of quantized transform coefficients using a second quantization parameter (QP) for the second block of video data and a second quantization matrix for the second block of video data, the first block of video data and the second block of video data forming an edge between the first block of video data and the second block of video data;
• inverse transform the second block of transform coefficients to produce a second residual block for the second block of video data;
• decode the second block of video data using the second residual block to form a second decoded block of video data;
• determine a first equivalent quantization parameter (QP) for the first decoded block of video data using the first quantization matrix, the first equivalent QP being different from the first QP for the first block,
• determine a second equivalent QP for the second decoded block of video data using the second quantization matrix, the second equivalent QP being different from the second QP for the second block,
• calculate a QPL value for the edge, the QPL value comprising an average of the first QP and the second QP,
• determine deblocking parameters based on the determined first equivalent QP and the determined second equivalent QP, wherein to determine the deblocking parameters, the video coder is configured to:
• code information indicative of deblocking offset parameter values;
• apply one of the deblocking offset parameter values to the QP value to form an offset QPL value;
• and
• determine the deblocking parameters based on the difference between the offset QPL value and the first equivalent QP or the second equivalent QP, and
• deblock the edge formed between the first block and the second block based on the determined deblocking parameters.

A device for coding video data, the device comprising:

• means for inverse quantizing a first block of quantized transform coefficients for a first block of video data to produce a first block of transform coefficients, comprising inverse transforming the first block of quantized transform coefficients using a first quantization parameter (QP) for the first block of video data and a first quantization matrix for the first block of video data;
• means for inverse transforming the first block of transform coefficients to produce a first residual block for the first block of video data;
• means for decoding the first block of video data using the first residual block to form a first decoded block of video data;
• means for inverse quantizing a second block of quantized transform coefficients for a second block of video data to produce a second block of transform coefficients, comprising inverse transforming the second block of quantized transform coefficients using a second quantization parameter (QP) for the second block of video data and a second quantization matrix for the second block of video data, the first block of video data and the second block of video data forming an edge between the first block of video data and the second block of video data;
• means for inverse transforming the second block of transform coefficients to produce a second residual block for the second block of video data;
• means for decoding the second block of video data using the second residual block to form a second decoded block of video data;
• means for determining a first equivalent quantization parameter (QP) for the first decoded block of video data using the first quantization matrix, the first equivalent QP being different from the first QP for the first block;
• means for determining a second equivalent QP for the second decoded block of video data using the second quantization matrix, the second equivalent QP being different from the second QP for the second block;
• means for calculating a QPL value for the edge, the QPL value comprising an average of the first QP and the second QP;
• means for determining deblocking parameters based on the determined first equivalent QP and the determined second equivalent QP, wherein the means for determining the deblocking parameters comprises:
• means for coding information indicative of deblocking offset parameter values;
• means for applying one of the deblocking offset parameter values to the QPL value to form an offset QPL value;
• and
• means for determining the deblocking parameters based on the difference between the offset QPL value and the first equivalent QP or the second equivalent QP;
• and
• means for deblocking the edge formed between the first block and the second block based on the determined deblocking parameters.

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

• inverse quantize a first block of quantized transform coefficients for a first block of video data to produce a first block of transform coefficients, comprising inverse transforming the first block of quantized transform coefficients using a first quantization parameter (QP) for the first block of video data and a first quantization matrix for the first block of video data;
• inverse transform the first block of transform coefficients to produce a first residual block for the first block of video data;
• decode the first block of video data using the first residual block to form a first decoded block of video data;
• inverse quantize a second block of quantized transform coefficients for a second block of video data to produce a second block of transform coefficients, comprising inverse transforming the second block of quantized transform coefficients using a second quantization parameter (QP) for the second block of video data and a second quantization matrix for the second block of video data, the first block of video data and the second block of video data forming an edge between the first block of video data and the second block of video data;
• inverse transform the second block of transform coefficients to produce a second residual block for the second block of video data;
• decode the second block of video data using the second residual block to form a second decoded block of video data;
• determine a first equivalent quantization parameter (QP) for the first decoded block of video data using the first quantization matrix, the first equivalent QP being different from the first QP for the first block;
• determine a second equivalent QP for the second decoded block of video data using the second quantization matrix, the second equivalent QP being different from the second QP for the second block,
• calculate a QPL value for the edge, the QPL value comprising an average of the first QP and the second QP;
• determine deblocking parameters based on the determined first equivalent QP and the determined second equivalent QP, wherein the instructions that cause the processor to determine the deblocking parameters comprise instructions that cause the processor to:
• code information indicative of deblocking offset parameter values;
• apply one of the deblocking offset parameter values to the QPL value to form an offset QPL value;
• and
• determine the deblocking parameters based on the difference between the offset QPL value and the first equivalent QP or the second equivalent QP;
• and
• deblock the edge formed between the first block and the second block based on the determined deblocking parameters.