Combination of inter-prediction and intra-prediction in video coding

A method of encoding video data, the method comprising:

• constructing a list of candidate motion vector predictors for a current block, wherein constructing the list of candidate motion vector predictors comprises:
• including an inter-prediction candidate in the list of candidate motion vector predictors, wherein the inter-prediction candidate comprises motion information including information of a motion vector of a neighboring or collocated block of the current block;
• and
• including an inter-intra candidate in the same list of candidate motion vector predictors that includes the inter-prediction candidate, wherein the inter-intra candidate comprises motion vector information of an inter-intra block generated from a first prediction block according to an intra-prediction mode and generated from a second prediction block according to an inter-prediction mode and the motion vector information;
• determining that the inter-intra candidate is to be used;
• and
• signaling an index value into the list of candidate motion vector predictors that identifies the inter-intra candidate in the list of candidate motion vector predictors based on the determination.

A device for coding video data, the device comprising:

• a memory;
• and
• a video coder comprising processing circuitry, wherein the video coder is configured to:
• construct a list of candidate motion vector predictors, for storage in the memory, for a current block, wherein to construct the list of candidate motion vector predictors, the video coder is configured to:
• include an inter-prediction candidate in the list of candidate motion vector predictors, wherein the inter-prediction candidate comprises motion information including information of a motion vector of a neighboring or collocated block of the current block;
• and
• include an inter-intra candidate in the same list of candidate motion vector predictors that includes the inter-prediction candidate, wherein the inter-intra candidate comprises motion vector information of an inter-intra block generated from a first prediction block according to an intra-prediction mode and generated from a second prediction block according to an inter-prediction mode and the motion vector information;
• determine that the inter-intra candidate is to be used;
• generate an inter-intra-prediction block for the current block comprising performing inter-prediction for the current block based on the motion vector information of the inter-intra candidate;
• and
• at least one of:
• reconstruct the current block based on the inter-intra-prediction block;
• or
• signal a residual between the current block and the inter-intra-prediction block and an index value into the list of candidate motion vector predictors that identifies the inter-intra candidate in the list of candidate motion vector predictors based on the determination that the inter-intra candidate is to be used.

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

• construct a list of candidate motion vector predictors, for storage in the memory, for a current block, wherein to construct the list of candidate motion vector predictors, the instructions cause the one or more processors to:
• include an inter-prediction candidate in the list of candidate motion vector predictors, wherein the inter-prediction candidate comprises motion information including information of a motion vector of a neighboring or collocated block of the current block;
• and
• include an inter-intra candidate in the same list of candidate motion vector predictors that includes the inter-prediction candidate, wherein the inter-intra candidate comprises motion vector information of an inter-intra block generated from a first prediction block according to an intra-prediction mode and generated from a second prediction block according to an inter-prediction mode and the motion vector information;
• determine that the inter-intra candidate is to be used;
• generate an inter-intra-prediction block for the current block comprising performing inter-prediction for the current block based on the motion vector information of the inter-intra candidate;
• and
• at least one of:
• reconstruct the current block based on the inter-intra-prediction block;
• or
• signal a residual between the current block and the inter-intra-prediction block and an index value into the list of candidate motion vector predictors that identifies the inter-intra candidate in the list of candidate motion vector predictors based on the determination that the inter-intra candidate is to be used.