Apparatus, a method and a computer program for video coding and decoding

An apparatus comprising:

• at least one processor and at least one memory, said at least one memory stored with code thereon, which when executed by said at least one processor, causes the apparatus to perform:
• encoding a bitstream comprising a base layer, a first enhancement layer and a second enhancement layer;
• encoding, in the bitstream, a first indication indicating that the base layer is used for prediction for the second enhancement layer;
• encoding, in the bitstream, a second indication indicating that the first enhancement layer is used for prediction for the second enhancement layer;
• encoding, in the bitstream, an indication of a number of bits in a prediction type mask syntax element;
• encoding, in the bitstream using a first prediction type mask syntax, an indication of a first set of prediction types that is applicable from the base layer to the second enhancement layer, wherein the first set of prediction types is a subset of all prediction types available for prediction between layers;
• and
• encoding, in the bitstream using a second prediction type mask syntax, an indication of a second set of prediction types that is applicable from the first enhancement layer to the second enhancement layer, wherein the second set of prediction types is a subset of all prediction types available for prediction between layers,
• wherein each of said prediction types available for prediction between layers is represented in the first prediction type mask syntax and the second prediction type mask syntax, and
• wherein said prediction types available for prediction between layers are adaptively selectable as at least one of the following:
• sample prediction, motion information prediction or filtering parameter prediction.

A non-transitory computer readable storage medium stored with code thereon for use by an apparatus, which when executed by a processor, causes the apparatus to perform:

• encoding a bitstream comprising a base layer, a first enhancement layer and a second enhancement layer;
• encoding, in the bitstream using a first prediction type mask syntax, a first indication indicating that the base layer is used for prediction for the second enhancement layer;
• encoding, in the bitstream using a second prediction type mask syntax, a second indication indicating that the first enhancement layer is used for prediction for the second enhancement layer;
• encoding, in the bitstream, an indication of a number of bits in a prediction type mask syntax element;
• encoding, in the bitstream, an indication of a first set of prediction types that is applicable from the base layer to the second enhancement layer, wherein the first set of prediction types is a subset of all prediction types available for prediction between layers;
• and
• encoding, in the bitstream, an indication of a second set of prediction types that is applicable from the first enhancement layer to the second enhancement layer, wherein the second set of prediction types is a subset of all prediction types available for prediction between layers,
• wherein each of said prediction types available for prediction between layers is represented in the first prediction type mask syntax and the second prediction type mask syntax, and
• wherein said prediction types available for prediction between layers are adaptively selectable as at least one of the following:
• sample prediction, motion information prediction or filtering parameter prediction.

A method comprising:

• decoding, from a bitstream, a first indication indicating that a first enhancement layer is used for prediction for a second enhancement layer;
• decoding, from the bitstream, a second indication that a base layer is used for prediction for the second enhancement layer;
• decoding, from the bitstream, an indication of a number of bits in a prediction type mask syntax element;
• decoding, from a first prediction type mask syntax in the bitstream, an indication of a first set of prediction types that is applicable from the base layer to the second enhancement layer, wherein the first set of prediction types is a subset of all prediction types available for prediction between layers;
• decoding, from a second prediction type mask syntax in the bitstream, an indication of a second set of prediction types that is applicable from the first enhancement layer to the second enhancement layer, wherein the second set of prediction types is a subset of all prediction types available for prediction between layers;
• decoding a picture of the base layer and a picture of the first enhancement layer;
• and
• decoding a picture of said second enhancement layer using said first set of prediction types from the picture of the base layer and said second set of prediction types from the picture of the first enhancement layer,
• wherein each of said prediction types available for prediction between layers is represented in the first prediction type mask syntax and the second prediction type mask syntax, and
• wherein said prediction types available for prediction between layers are at least one of the following:
• sample prediction, motion information prediction or filtering parameter prediction.

An apparatus comprising:

• at least one processor and at least one memory, said at least one memory stored with code thereon, which when executed by said at least one processor, causes the apparatus to perform:
• decoding, from a bitstream, a first indication indicating that a first enhancement layer is used for prediction for a second enhancement layer;
• decoding, from the bitstream, a second indication that a base layer is used for prediction for the second enhancement layer;
• decoding, from the bitstream, an indication of a number of bits in a prediction type mask syntax element;
• decoding, from a first prediction type mask syntax in the bitstream, an indication of a first set of prediction types that is applicable from the base layer to the second enhancement layer, wherein the first set of prediction types is a subset of all prediction types available for prediction between layers;
• decoding, from a second prediction type mask syntax in the bitstream, an indication of a second set of prediction types that is applicable from the first enhancement layer to the second enhancement layer, wherein the second set of prediction types is a subset of all prediction types available for prediction between layers;
• decoding a picture of the base layer and a picture of the first enhancement layer;
• and
• decoding a picture of said second enhancement layer using said first set of prediction types from the picture of the base layer and said second set of prediction types from the picture of the first enhancement layer,
• wherein each of said prediction types available for prediction between layers is represented in the first prediction type mask syntax and the second prediction type mask syntax, and
• wherein said prediction types available for prediction between layers are at least one of the following:
• sample prediction, motion information prediction or filtering parameter prediction.

A non-transitory computer readable storage medium stored with code thereon for use by an apparatus, which when executed by a processor, causes the apparatus to perform:

• decoding, from a bitstream, a first indication indicating that a first enhancement layer is used for prediction for a second enhancement layer;
• decoding, from the bitstream, a second indication that a base layer is used for prediction for the second enhancement layer;
• decoding, from the bitstream, an indication of a number of bits in a prediction type mask syntax element;
• decoding, from a first prediction type mask syntax in the bitstream, an indication of a first set of prediction types that is applicable from the base layer to the second enhancement layer, wherein the first set of prediction types is a subset of all prediction types available for prediction between layers;
• decoding, from a second prediction type mask syntax in the bitstream, an indication of a second set of prediction types that is applicable from the first enhancement layer to the second enhancement layer, wherein the second set of prediction types is a subset of all prediction types available for prediction between layers;
• decoding a picture of the base layer and a picture of the first enhancement layer;
• and
• decoding a picture of said second enhancement layer using said first set of prediction types from the picture of the base layer and said second set of prediction types from the picture of the first enhancement layer,
• wherein each of said prediction types available for prediction between layers is represented in the first prediction type mask syntax and the second prediction type mask syntax, and
• wherein said prediction types available for prediction between layers are at least one of the following:
• sample prediction, motion information prediction or filtering parameter prediction.