Volumetric media process methods and apparatus

1. A method of volumetric media processing, comprising:

determining, from a media presentation description (MPD) file, one or more preselection elements corresponding to a preselection of a volumetric media, each of the one or more preselection elements including a descriptor that identifies the volumetric media and an attribute that preselects an atlas data component and associated video-encoded components of the volumetric media;

making a first determination whether a format of a bitstream includes a multi-atlas access to the volumetric media or a single atlas access to the volumetric media;

making a second determination whether a partial access or a full access of the volumetric media is available;

making a third determination whether the partial access is atlas-based or tile-based for a case that the partial access of the multi-atlas access is available based on the first determination and the second determination;

accessing, using the one or more preselection elements and the first to third determinations, one or more atlas data components and the associated video-encoded components of the volumetric media; and

reconstructing the volumetric media from the one or more atlas data components and the associated video-encoded components.

2. The method of claim 1 , wherein the descriptor that identifies the volumetric media includes 1) an identity of the atlas data component of the volumetric media, or 2) one or more tile addresses for tiles belonging to the atlas data component of the volumetric media.

3. The method of claim 1 , wherein, due to the preselection of the volumetric media and the third determination indicating that the partial access is atlas-based,

the accessing of the one or more atlas data components accesses preselected one or more atlases.

4. The method of claim 1 , wherein, due to the preselection of the volumetric media and the third determination indicating that the partial access is tile-based,

the accessing of the one or more atlas data components accesses preselected tiles and one or more atlases that the preselected tiles belong to.

5. The method of claim 1 , wherein

the one or more atlas data components include an atlas data component of an entry atlas of the volumetric media, the entry atlas representing an atlas track defined to store a parameter set.

6. The method of claim 1 , wherein the one or more atlas data components carry the atlas data of the volumetric media and the video-encoded components carry 2D video encoded data for any of an occupancy map, geometry, or attribute component video bitstreams of the volumetric media.

7. A method of volumetric media encoding, comprising:

generating, from a three-dimensional scene, a volumetric media comprising one or more atlas data components and associated video-encoded components representing the three-dimensional scene;

including, in a media present description (MPD) file, one or more preselection elements that indicate a preselection of the volumetric media, each of the one or more preselection elements including a descriptor that identifies the volumetric media and an attribute that preselects an atlas data component and the associated video-encoded components of the volumetric media,

wherein the one or more preselection elements indicate whether an access to the volumetric media is atlas-based or tile-based and provide an access to one or more atlas data components and the video-encoded components associated with the three-dimensional scene,

wherein the method further comprises:

configuring an access to i) preselected atlases in a case that the one or more preselection elements indicate that the access to the volumetric media is atlas-based or ii) preselected tiles in a case that the one or more preselection elements indicate that the access to the volumetric media is tile-based.

8. The method of claim 7 , wherein the descriptor that identifies the volumetric media includes 1) an identity of the atlas data component of the volumetric media, or 2) one or more tile addresses for tiles belonging to the atlas data component of the volumetric media.

9. The method of claim 7 , wherein, due to the preselection of the volumetric media indicating an atlas-based access to the volumetric media, the method further includes:

configuring an access to all tiles belonging to the preselected atlases.

10. The method of claim 7 , wherein

the one or more atlas data components include an atlas data component of an entry atlas of the volumetric media, the entry atlas representing an atlas track defined to store a parameter set.

11. The method of claim 7 , wherein, due to the preselection of the volumetric media indicating a tile-based access to the volumetric media, the method includes: configuring an access to one or more atlases that the preselected tiles belong to.

12. An apparatus for processing volumetric media comprising a processor configured to implement a method comprising:

determining, from a media presentation description (MPD) file, one or more preselection elements corresponding to a preselection of a volumetric media, each of the one or more preselection elements including a descriptor that identifies the volumetric media and an attribute that preselects an atlas data component and associated video-encoded components of the volumetric media;

making a first determination whether a format of a bitstream includes a multi-atlas access to the volumetric media or a single atlas access to the volumetric media;

making a second determination whether a partial access or a full access of the volumetric media is available;

making a third determination whether the partial access is atlas-based or tile-based for a case that the partial access of the multi-atlas access is available based on the first determination and the second determination;

accessing, using the one or more preselection elements and the first to third determinations, one or more atlas data components and the associated video-encoded components of the volumetric media; and

reconstructing the volumetric media from the one or more atlas data components and the associated video-encoded components.

13. The apparatus of claim 12 , wherein, due to the preselection of the volumetric media and the third determination indicating that the partial access is atlas-based,

the accessing of the one or more atlas data components accesses preselected one or more atlases.

14. The apparatus of claim 12 , wherein the one or more atlas data components include an atlas data component of an entry atlas of the volumetric media, the entry atlas representing an atlas track defined to store a parameter set.

15. The apparatus of claim 12 , wherein, due to the preselection of the volumetric media and the third determination indicating that the partial access is tile-based, the accessing of the one or more atlas data components accesses preselected tiles and one or more atlases that the preselected tiles belong to.

16. An apparatus for processing volumetric media comprising a processor configured to implement a method comprising:

generating, from a three-dimensional scene, a volumetric media comprising one or more atlas data components and associated video-encoded components representing the three-dimensional scene;

including, in a media present description (MPD) file, one or more preselection elements that indicate a preselection of the volumetric media, each of the one or more preselection elements including a descriptor that identifies the volumetric media and an attribute that preselects an atlas data component and the associated video-encoded components of the volumetric media,

wherein the one or more preselection elements indicate whether an access to the volumetric media is atlas-based or tile-based and provide an access to one or more atlas data components and the video-encoded components associated with the three-dimensional scene,

wherein the method further comprises:

configuring an access to i) preselected atlases in a case that the one or more preselection elements indicate that the access to the volumetric media is atlas-based or ii) preselected tiles in a case that the one or more preselection elements indicate that the access to the volumetric media is tile-based.

17. The apparatus of claim 16 , wherein, due to the preselection of the volumetric media indicating an atlas-based access to the volumetric media, the method further includes:

configuring an access to all tiles belonging to the preselected atlases.

18. The apparatus of claim 16 , wherein, in case that the preselection of the volumetric media indicates an access of the volumetric media with multiple atlases, the method further comprises:

configuring the atlas data component of an entry atlas of the volumetric media.

19. The apparatus of claim 16 , wherein, due to the preselection of the volumetric media indicating a tile-based access to the volumetric media, the method includes: configuring an access to one or more atlases that the preselected tiles belong to.