Scaling matrices and signaling for video coding

A device for coding video data, the device comprising:

• a memory configured to store the video data;
• and
• one or more processors implemented in circuitry and communicatively coupled to the memory, the one or more processors being configured to:
• determine whether scaling matrices may be applied to a low-frequency non-separable transform (LFNST) coded block of the video data;
• based on a determination that scaling matrices may not be applied to the LFNST coded block, not apply the scaling matrices to the LFNST coded block;
• and
• code the video data without applying the scaling matrices to the LFNST coded block.

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

• determine whether scaling matrices may be applied to a low-frequency non-separable transform (LFNST) coded block of the video data;
• based on a determination that scaling matrices may not be applied to the LFNST coded block, not apply the scaling matrices to the LFNST coded block;
• and
• code the video data without applying the scaling matrices to the LFNST coded block.

A device for coding video data, the device comprising:

• means for determining whether scaling matrices may be applied to a low-frequency non-separable transform (LFNST) coded block of the video data;
• means for not applying the scaling matrices to the LFNST coded block based on a determination that scaling matrices may not be applied to the LFNST coded block;
• and
• means for coding the video data without applying the scaling matrices to the LFNST coded block.