Prediction-domain filtering for video coding

A method of encoding video data, the method comprising:

• generating, by a video encoder implemented in circuitry, prediction information for a current block;
• filtering, by the video encoder, the prediction information using a filter corresponding to a filter type to generate filtered prediction information;
• determining, by the video encoder, based on one or more of a height of the current block or a width of the current block and based on the filter type, a filter index value;
• and
• encoding, by the video encoder, a syntax element based on the filter index value.

A device for decoding video data, the device comprising:

• a memory configured to store video data;
• and
• one or more processors implemented in circuitry and configured to:
• generate prediction information for a current block;
• determine a filter index value based on a syntax element signaled for the video data;
• determine, based on one or more of a height of the current block or a width of the current block and based on the filter index value, a filter type;
• and
• filter the prediction information using a filter corresponding to the filter type to generate filtered prediction information.

A device for encoding video data, the device comprising:

• a memory configured to store video data;
• and
• one or more processors implemented in circuitry and configured to:
• generate prediction information for a current block;
• filter the prediction information using a filter corresponding to a filter type to generate filtered prediction information;
• determine, based on one or more of a height of the current block or a width of the current block and based on the filter type, a filter index value;
• and
• encode a syntax element based on the filter index value.