Methods and apparatus for signaling viewports and regions of interest

A method for encoding video data, the method comprising:

• encoding video data comprising a region of interest, comprising:
• encoding a region structure associated with the video data that specifies one or more aspects of the region of interest based on a sphere, wherein the one or more aspects comprise a coordinate aspect of the region of interest, a size aspect of the region of interest, a range aspect of the region of interest, or some combination thereof, the region structure comprising:
• data indicative of whether each of the region structure comprises data indicative of a global aspect of the region of interest that applies to each of a set of samples that provide one or more non-global aspects for at least one portion of the region of interest;
• and
• for each global aspect of the one or more aspects, data in the region structure that associates the global aspect with the set of samples.

An apparatus configured to decode video data, the apparatus comprising a processor in communication with memory, the processor being configured to execute instructions stored in the memory that cause the processor to:

• receive video data comprising a region of interest;
• determine a region structure associated with the video data that specifies one or more aspects of the region of interest based on a sphere, wherein the one or more aspects comprise a coordinate aspect of the region of interest, a size aspect of the region of interest, a range aspect of the region of interest, or some combination thereof, the region structure comprising:
• data indicative of whether the region structure comprises data indicative of a global aspect of the region of interest that applies to each of a set of samples that provide one or more non-global aspects for at least one portion of the region of interest;
• and
• for each global aspect of the one or more aspects, data in the region structure that associates the global aspect with the set of samples;
• and
• determine the region of interest in the video data based on the data indicative of whether the region structure comprises data indicative of the one or more aspects of the region of interest comprising:
• for each global aspect, determining the data in the region structure for the set of samples, such that each sample in the set of samples specifies any non-global aspects for the sample and inherits the global aspect for the at least one portion of the region of interest.

An apparatus for encoding video data, the apparatus comprising a processor in communication with memory, the processor being configured to execute instructions stored in the memory that cause the processor to:

• encode video data comprising a region of interest, comprising:
• encoding a region structure associated with the video data that specifies one or more aspects of the region of interest based on a sphere, wherein the one or more aspects comprise a coordinate aspect of the region of interest, a size aspect of the region of interest, a range aspect of the region of interest, or some combination thereof, the region structure comprising:
• data indicative of whether the region structure comprises data indicative of a global aspect of the region of interest that applies to each of a set of samples that provide one or more non-global aspects for at least one portion of the region of interest;
• and
• for each global aspect of the one or more aspects, data in the region structure that associates the global aspect with the set of samples.