Implicit signaling of scalability dimension identifier 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;
determining, based on a flag included in said video syntax set, whether a scalability dimension identifier is implicitly signaled;
wherein said scalability dimension identifier specifies a scalability dimension of a particular layer of said coded video sequence, the scalability dimension being one of multiple types, including a spatial type and a quality type;
in response to determining that the scalability dimension identifier is implicitly signaled, deriving the scalability dimension identifier from a network abstraction layer (NAL) unit header;
decoding a base layer of a picture in the video sequence;
decoding an enhancement layer based on the scalability dimension; and
generating a picture to be displayed based on the base layer and the enhancement layer.
2. The method of claim 1 wherein said flag with a value of 0 specifies an explicit signaling of said scalability dimension identifier.
3. The method of claim 1 wherein said scalability dimension identifier specifies said particular layer and identifies said one of multiple types.
4. The method of claim 1 wherein said flag with a value of 1 specifies said implicit signaling of said scalability dimension identifier.
5. The method of claim 1 wherein whether a scalability dimension identifier is implicitly signaled is determined using a syntax including if(!flag) condition.
6. The method of claim 1 wherein said scalability dimension identifier specifies more than one identifier of a plurality of scalability dimension types of said particular layer of said coded video sequence.
7. The method of claim 4 wherein values of scalability dimension identifier are derived based on other information signaled in a video syntax set.
8. The method of claim 7 wherein the other information signaled in the video syntax set includes information about length in bits of the scalability dimension identifier.
9. The method of claim 8 wherein the length in bits of the scalability dimension identifier is specified using dimension_id_len_minus1[i].