Combined residual coding in video coding

A device for decoding video data, the device comprising:

• a memory to store the video data;
• and
• one or more processors implemented in circuitry, the one or more processors configured to:
• generate decoded modified chroma residual data by applying an inverse transform to convert a set of transform coefficients of a block of the video data from a transform domain to a sample domain;
• after generating the decoded modified chroma residual data, apply a first inverse residual modification function to the decoded modified chroma residual data to generate first inverse modified chroma residual data for a first chroma component, wherein the first inverse residual modification function sets the first inverse modified chroma residual data equal to the decoded modified chroma residual data;
• after generating the decoded modified chroma residual data, apply a second inverse residual modification function to the decoded modified chroma residual data to generate second inverse modified chroma residual data for a second chroma component, wherein the second inverse residual modification function sets the second inverse modified chroma residual data equal to a value divided by 2, where the value is equal to 0 minus the decoded modified chroma residual data;
• and
• reconstruct the block of the video data based on the first inverse modified chroma residual data and the second inverse modified chroma residual data.

A device for decoding video data, the device comprising:

• means for generating decoded modified chroma residual data by applying an inverse transform to convert a set of transform coefficients of a block of the video data from a transform domain to a sample domain;
• means for applying, after generating the decoded modified chroma residual data, a first inverse residual modification function to the decoded modified chroma residual data to generate first inverse modified chroma residual data for a first chroma component, wherein the first inverse residual modification function sets the first inverse modified chroma residual data equal to the decoded modified chroma residual data;
• means for applying, after generating the decoded modified chroma residual data, a second inverse residual modification function to the decoded modified chroma residual data to generate second inverse modified chroma residual data for a second chroma component, wherein the second inverse residual modification function sets the second inverse modified chroma residual data equal to a value divided by 2, where the value is equal to 0 minus the decoded modified chroma residual data;
• and
• means for reconstructing the block of the video data based on the first inverse modified chroma residual data and the second inverse modified chroma residual data.

A non-transitory computer-readable storage medium having stored thereon instructions that, when executed, cause one or more processors to:

• generate decoded modified chroma residual data by applying an inverse transform to convert a set of transform coefficients of a block of video data from a transform domain to a sample domain;
• after generating the decoded modified chroma residual data, apply a first inverse residual modification function to the decoded modified chroma residual data to generate first inverse modified chroma residual data for a first chroma component, wherein the first inverse residual modification function sets the first inverse modified chroma residual data equal to the decoded modified chroma residual data;
• after generating the decoded modified chroma residual data, apply a second inverse residual modification function to the decoded modified chroma residual data to generate second inverse modified chroma residual data for a second chroma component, wherein the second inverse residual modification function sets the second inverse modified chroma residual data equal to a value divided by 2, where the value is equal to 0 minus the decoded modified chroma residual data;
• and
• reconstruct the block of the video data based on the first inverse modified chroma residual data and the second inverse modified chroma residual data.