Sub-bitstream applicability to nested SEI messages in video coding

摘要

A device determines, based at least in part on a syntax element in a scalable nesting supplemental enhancement information (SEI) message encapsulated by an SEI Network Abstraction Layer (NAL) unit, whether a nested SEI message encapsulated by the scalable nesting SEI message is applicable to a default sub-bitstream. The default sub-bitstream is an operation point representation of an operation point defined by a layer identifier specified in a NAL unit header of the SEI NAL unit and a temporal identifier specified in the NAL unit header. When the nested SEI message is applicable to the default sub-bitstream, the device uses the nested SEI message in an operation on the default sub-bitstream.

主权项

1. A method of processing video data, the method comprising:
determining, based at least in part on a syntax element in a supplemental enhancement information (SEI) message that is encapsulated by an SEI Network Abstraction Layer (NAL) unit and encapsulates one or more nested SEI messages, whether the one or more nested SEI messages are applicable to a default sub-bitstream of an encoded video bitstream that comprises coded pictures of the video data, wherein the syntax element is not in any of the one or more nested SEI messages and the default sub-bitstream is an operation point representation of an operation point defined by a layer identifier specified in a NAL unit header of the SEI NAL unit and a temporal identifier specified in the NAL unit header; and when the one or more nested SEI messages are applicable to the default sub-bitstream, using the one or more nested SEI messages in an operation on the default sub-bitstream.