Processing bitstream constraints relating to inter-layer prediction types in multi-layer video coding

A method of coding video information, the method comprising:

• identifying a current picture to be predicted using at least one type of inter layer prediction (ILP), the type of ILP comprising inter layer motion prediction (ILMP), or inter layer sample prediction (ILSP), or both;
• and
• performing at least one of:
• (i) in response to a determination that the current picture is to be predicted using at least ILMP:
• processing a collocated reference index value indicative of an index of a collocated picture of the current picture used for temporal motion vector prediction, the collocated reference index value associated with the current picture, wherein the collocated reference index value specifies a first reference picture that is to be used in predicting the current picture using ILP;
• and
• determining whether the first reference picture specified by the collocated reference index value is allowed to be used for predicting the current picture using ILMP based on a motion prediction enabled flag associated with the first reference picture;
• or
• (ii) in response to a determination that the current picture is to be predicted using at least ILSP:
• processing a reference value indicative of an index of a reference picture for a block in the current picture, the reference index value associated with the block in the current picture, wherein the reference index value specifies a second reference picture that is to be used in predicting the block in the current picture using ILP;
• and
• determining whether the second reference picture specified by the reference index value is allowed to be used for predicting the block in the current picture using ILSP based on a sample prediction enabled flag associated with the second reference picture.

A non-transitory computer readable medium comprising instructions that when executed on a processor comprising computer hardware cause the processor to:

• identify a current picture to be predicted using at least one type of inter layer prediction (ILP), the type of ILP comprising inter layer motion prediction (ILMP), or inter layer sample prediction (ILSP), or both;
• and
• perform at least one of:
• (i) in response to a determination that the current picture is to be predicted using at least ILMP:
• process a collocated reference index value indicative of an index of a collocated picture of the current picture used for temporal motion vector prediction, the collocated reference index value associated with the current picture, wherein the collocated reference index value specifies a first reference picture that is to be used in predicting the current picture using ILP;
• and
• determine whether the first reference picture specified by the collocated reference index value is allowed to be used for predicting the current picture using ILMP based on a motion prediction enabled flag associated with the first reference picture;
• or
• (ii) in response to a determination that the current picture is to be predicted using at least ILSP:
• process a reference index value indicative of an index of a reference picture for a block in the current picture, the reference index value associated with the block in the current picture, wherein the reference index value specifies a second reference picture that is to be used in predicting the block in the current picture using ILP;
• and
• determine whether the second reference picture specified by the reference index value is allowed to be used for predicting the block in the current picture using ILSP based on a sample prediction enabled flag associated with the second reference picture.

An apparatus configured to code video information, the apparatus comprising:

• means for storing video data;
• means for identifying a current picture to be predicted using at least one type of inter layer prediction (ILP), the type of ILP comprising inter layer motion prediction (ILMP), or inter layer sample prediction (ILSP), or both;
• means for, in response to a determination that the current picture is to be predicted using at least ILMP, processing a collocated reference index value indicative of an index of a collocated picture of the current picture used for temporal motion vector prediction, the collocated reference index value associated with the current picture, wherein the collocated reference index value specifies a first reference picture that is to be used in predicting the current picture using ILP,
• the means for processing the collocated reference index value further configured to determine whether the first reference picture specified by the collocated reference index value is allowed to be used for predicting the current picture using ILMP based on a motion prediction enabled flag associated with the first reference picture;
• and
• means for, in response to a determination that the current picture is to be predicted using at least ILSP, processing a reference index value indicative of an index of a reference picture for a block in the current picture, the reference index value associated with the block in the current picture, wherein the reference index value specifies a second reference picture that is to be used in predicting the block in the current picture using ILP,
• the means for processing the reference index value further configured to determine whether the second reference picture specified by the reference index value is allowed to be used for predicting the block in the current picture using ILSP based on a sample prediction enabled flag associated with the second reference picture.