Signaling layer dependency information in a parameter set
A system for decoding a video bitstream includes receiving a frame of the video that includes at least one slice and at least one tile and where each of the at least one slice and the at least one tile are not all aligned with one another.
1. A method for decoding a coded video sequence comprising:
receiving a video syntax set that includes information applicable to said coded video sequence, where said coded video sequence includes a plurality of layers of coded video frames; and
decoding said coded video sequence with said video syntax set;
wherein said video syntax set includes a dependency flag indicating one or more direct dependencies between said plurality of layers of said coded video sequence and said video syntax set further includes a syntax element number and at least one pair of indexes (i,j) when said direct dependency specifies said layer indexed by said second index value is a direct reference layer for said layer indexed by said first index value, and wherein said syntax element number specifies the number of layers the layer indexed by said first index value directly depends on, wherein i is said first index value and j is said second index value; and
wherein said direct dependency specifies whether a particular layer indexed by a second index value is a direct reference layer for another layer indexed by a first index value.
2. The method of claim 1 wherein when said dependency flag with a value of 0 specifies that said particular layer indexed by said second index value is not a said direct reference layer for said another layer indexed by said first index value.
3. The method of claim 1 wherein said dependency flag with a value of 1 specifies that said particular layer indexed by said second index value may be a said direct reference layer for said another layer indexed by said first index value.
4. The method of claim 1 wherein said dependency flag is not present for said first index value and said second index value it is inferred to be 0.
5. The method of claim 1 wherein said dependency flag is not present within a range of 0 to a value associated with a maximum number of said plurality of layers for said first index value and said second index value it is inferred to be 0.
6. The method of claim 1 wherein said pair of indexes i and j use 1 bit for signaling.
7. The method of claim 1 wherein said decoding said coded video sequence with said video syntax set comprises:
decoding said layer indexed by said first index value based on said layer indexed by said a second index value when a portion of said layer indexed by said second index value has been parsed or reconstructed successfully.
8. An electronic device, comprising:
a processor; and
a non-transitory computer readable storage medium storing program for execution by the processor, the program including instructions to:
receive a video syntax set that includes information applicable to said coded video sequence, where said coded video sequence includes a plurality of layers of coded video frames; and
decode said coded video sequence with said video syntax set;
wherein said video syntax set includes a dependency flag indicating one or more direct dependencies between said plurality of layers of said coded video sequence; wherein said direct dependency specifies whether a particular layer indexed by a second index value is a direct reference layer for another layer indexed by a first index value; wherein said video syntax set further includes a syntax element number and at least one pair of indexes (i,j) when said direct dependency specifies said layer indexed by said second index value is a direct reference layer for said layer indexed by said first index value, wherein said syntax element number specifies the number of layers the layer indexed by said first index value directly depends on, wherein i is said first index value and j is said second index value.
9. The device of claim 8 wherein the instructions to decode said coded video sequence with said video syntax set include instructions to decode said layer indexed by said first index value based on said layer indexed by said second index value when a portion of said particular layer indexed by said second index value has been parsed or reconstructed successfully.