Devices and methods for image and video coding

A non-transitory machine-readable medium having instructions stored therein, which when executed by a processor, cause the processor to perform operations, the operations comprising:

• obtaining a value of a reference line index for a current block;
• constructing a most probable mode (MPM) list for the current block;
• obtaining a value of intra-prediction mode index for the current block;
• when the value of the reference line index is not equal to 0,
• obtaining an intra prediction mode of the current block according to the MPM list for the current block and the value of the intra-prediction mode index for the current block, wherein the value of the intra-prediction mode index indicates a position that corresponds to the intra prediction mode of the current block among angular intra-prediction modes in the MPM list;
• obtaining prediction values for the current block according to the intra prediction mode of the current block and reference samples of neighboring blocks adjacent to the current block;
• and
• obtaining reconstructed sample values of the current block according to the prediction values for the current block.

A decoder, comprising:

• one or more processors;
• and
• a non-transitory computer-readable storage medium coupled to the processors to store instructions, which when executed by the processors, cause the processors to perform operations, the operations including:
• obtaining a value of a reference line index for a current block;
• constructing a most probable mode (MPM) list for the current block;
• obtaining a value of intra-prediction mode index for the current block;
• when the value of the reference line index is not equal to 0,
• obtaining an intra prediction mode of the current block according to the MPM list for the current block and the value of the intra-prediction mode index for the current block, wherein the value of the intra-prediction mode index indicates a position that corresponds to the intra prediction mode of the current block among angular intra-prediction modes in the MPM list;
• obtaining prediction values for the current block according to the intra prediction mode of the current block and reference samples of neighboring blocks adjacent to the current block;
• and
• obtaining reconstructed sample values of the current block according to the prediction values for the current block.