| 摘要 |
A method, apparatus and computer program product are provided that permit values of certain parameters or syntax elements, such as the HRD parameters and/or a level indicator, to be taken from a syntax structure, such as a sequence parameter set. In this regard, values of certain parameters or syntax elements, such as the HRD parameters and/or a level indicator, may be taken from a syntax structure of a certain other layer, such as the highest layer, present in an access unit, coded video sequence and/or bitstream even if the other layer, such as the highest layer, were not decoded. The syntax element values from the other layer, such as the highest layer, may be semantically valid and may be used for conformance checking, while the values of the respective syntax elements from other respective syntax structures, such as sequence parameter sets, may be active or valid otherwise. |
| 主权项 |
1. A method comprising:
producing, with a processor, two or more scalability layers of a scalable data stream, wherein each of said two or more scalability layers has a different coding property, is associated with a scalability layer identifier and is characterized by a first set of syntax elements comprising at least a profile and a second set of syntax elements comprising at least one of a level or hypothetical reference decoder (HRD) parameters; inserting a first scalability layer identifier value in a first elementary unit including data from a first of two or more scalability layers; causing the first of said two or more scalability layers to be signaled with said first and second set of syntax elements in a first parameter set elementary unit such that the first parameter set elementary unit is readable by a decoder to determine the values of the first and second set of syntax elements without decoding a scalability layer of said scalable data stream; inserting the first scalability layer identifier value in the first parameter set elementary unit; inserting a second scalability layer identifier value in a second elementary unit including data from a second of two or more scalability layers; causing the second of said two or more scalability layers to be signaled with said first and second set of syntax elements in a second parameter set elementary unit such that the second parameter set elementary unit is readable by the decoder to determine the coding property without decoding the scalability layer of said scalable data stream; inserting the second scalability layer identifier value in the second parameter set elementary unit, wherein values of the first set of syntax elements in the first parameter set elementary unit are valid in an instance in which the first elementary unit is processed and the second elementary unit is ignored or removed, wherein values of the second set of syntax elements in the first parameter set elementary unit are valid in an instance in which the first elementary unit is processed and the second elementary unit is removed, wherein values of the first set of syntax elements in the second parameter set elementary unit are valid in an instance in which the second elementary unit is processed, and wherein values of the second set of syntax elements in the second parameter set elementary unit are valid in an instance in which the second elementary unit is processed. |
