Scalable data stream and network entity
The handling of scalable data streams by network entities is rendered less complex by, in the data stream, accompanying packets which actually carry data by packets of a different packet type which have a scalability axes descriptor defining the number of scalability axes and a semantic meaning thereof. In another aspect, the handling of scalable data streams by network entities is rendered more efficient by conveying level and/or profile descriptors using packets other than the data carrying packets, with profile and/or level descriptors being divided up into a first set explicitly signaling the definition of the available coding option set and/or available syntax element value range for a respective operation point, and a second set of profile and/or level descriptors which signal the definition of the available coding option set and/or available syntax element value range for their respective operation points by reference another profile and/or level descriptor.
1. An apparatus comprising:
a memory device; and
a processor comprising hardware configured to:
process a data stream including packets having encoded information related to a video, the data stream including:
a first syntax element identifying an operation point associated with a first packet of the packets, wherein each portion of different portions of the first syntax element is associated with a corresponding scalability type of a plurality of scalability types,
a second syntax element, which provides information to determine association of each portion of the first syntax element with the corresponding scalability type, and
the first packet including data, which when parsed by a decoder, contribute to reconstruction of at least a portion of the video at the operation point associated with the first packet,
obtain an operation point identifier associated with the first packet in accordance with the first and second syntax elements, and
decode the data of the first packet based on the operation point identifier to reconstruct at least a portion of the video.
2. The apparatus of claim 1 , wherein the processor is configured to render a selection of the packets of the first packet type.
3. The apparatus of claim 1 , wherein the first packet is of a first packet type, and the processor is configured to read, from a packet of a second packet type, a sequence of profile or level descriptors individually associated with at least a subset of a plurality of operation points, each profile or level descriptor defining an available coding option set or an available syntax element value range which a syntax of packets having the operation point associated with the respective profile or level descriptor, associated therewith, obey,
wherein the processor is configured to,
responsive to a signaling in the data stream, read from a first set of the profile or level descriptors the definition of the available coding option set or available syntax element value range, and
read, for a second, disjoint non-empty set of the profile or level descriptors, a reference to another, profile or level descriptor and derive the definition of the available coding option set or available syntax element value range of the second, disjoint non-empty set of the profile or level descriptors from the respective referenced profile or level descriptor.
4. The apparatus of claim 3 , wherein each profile or level descriptor comprises a field identifying the operation point the respective profile or level descriptor is associated with.
5. The apparatus of claim 4 , wherein the second, disjoint non-empty set of the profile or level descriptors signal the definition of the available coding option set or available syntax element value range by referencing another profile or level descriptor using an explicit signaling of the field of the referenced profile or level descriptor.
6. The apparatus of claim 3 , wherein the processor is configure to read, from the packets of the second packet type, also, for each of at least a subset of the plurality of operation points, a syntax identifying other operation points of the plurality of operation points, identified by lower operation point identifiers, which the respective operation point is an extension of, thereby indicating the sequential operation point order.
7. The apparatus of claim 6 , wherein each field identifies the respective operation point using a bit-sequence common to the operation point identifiers identifying the respective operation point.
8. A non-transitory computer-readable medium for storing data associated with a video, comprising:
a data stream stored in the non-transitory computer-readable medium, the data stream including packets having encoded information related to the video, the data stream including:
a first syntax element identifying an operation point associated with a first packet of the packets, wherein each portion of different portions of the first syntax element is associated with a corresponding scalability type of a plurality of scalability types,
a second syntax element, which provides information to determine association of each portion of the first syntax element with the corresponding scalability type, and
the first packet including data, which when parsed by a decoder, contribute to reconstruction of at least a portion of the video at the operation point associated with the first packet, wherein an operation point identifier associated with the first packet is obtained in accordance with the first and second syntax elements.
9. The computer-readable medium of claim 8 , wherein the data stream further includes a scalability descriptor syntax element, wherein possible states of the scalability descriptor syntax element are individually associated with different combinations of values for n scalability types and a corresponding semantic meaning of the n scalability types.
10. The computer-readable medium of claim 8 , wherein the first packet is of a first packet type, and a packet of a second packet type in the data stream comprises a sequence of profile or level descriptors associated with one or more of at least a subset of a plurality of operation points, each profile or level descriptor defining an available coding option set or an available syntax element value range which a syntax of packets having an operation point associated with the respective profile or level descriptor, associated therewith, obey,
wherein a first set of the profile or level descriptors explicitly signal the definition of the available coding option set or available syntax element value range, and a second, disjoint non-empty set of the profile or level descriptors signal the definition of the available coding option set or available syntax element value range by referencing another profile or level descriptor.
11. The computer-readable medium of claim 10 , wherein each profile or level descriptor comprises a field identifying the operation point the respective profile or level descriptor is associated with.
12. An encoder comprising:
a memory device; and
a processor comprising hardware configured to:
encode, into a data stream, packets having information related to a video, a first syntax element identifying an operation point associated with a first packet of the packets, wherein each portion of different portions of the first syntax element is associated with a corresponding scalability type of a plurality of scalability types,
a second syntax element, which provides information to determine association of each portion of the first syntax element with the corresponding scalability type, and the first packet including data, which when parsed by a decoder, contribute to reconstruction of at least a portion of the video at the operation point associated with the first packet
wherein-an operation point identifier associated with the first packet is obtained in accordance with the first and second syntax elements.
13. The encoder of claim 12 , wherein the first packet is of a first packet type, and the processor is configured to encoder, into a packet of a second packet type, a sequence of profile or level descriptors individually associated with at least a subset of a plurality of operation points, each profile or level descriptor defining an available coding option set or an available syntax element value range which a syntax of packets having the operation point associated with the respective profile or level descriptor, associated therewith, obey.
14. The apparatus of claim 1 , wherein the first packet includes the first and second syntax elements, and the operation point identifier identifies the scalability type from the plurality of scalability types for the operation point associated with the first packet.
15. The apparatus of claim 1 , wherein the first syntax element is of a fixed bit length.
16. The computer-readable medium of claim 8 , wherein the first syntax element is of a fixed bit length.
17. The encoder of claim 12 , wherein the first syntax element is of a fixed bit length.