1     Definition 2     Functional Requirements 3     Syntax
4     Semantics 5    Conformance Testing 6     Performance Assessment

1      Definition

A Data Type including an Audio Scene’s:

  1. Audio Objects and their spatial arrangement.
  2. Audio Sub-Scenes and their spatial arrangement.

2      Functional Requirements

Audio Scene Descriptors include:

  1. The ID of a Virtual Space (M-Instance) where it is or will be located.
  2. The ID of the Audio Scene Descriptors.
  3. The number of Audio Objects in the Audio Scene.
  4. The number of Audio Sub-Scenes in the Audio Scene
  5. The Space-Time Attributes of the Audio Scene.
  6. The Audio Objects and their Spatial Attitudes.
  7. The Audio Sub-Scenes and their Spatial Attitudes.

Compared to Audio Basic Scene Descriptors, Audio Scene Descriptors may additionally include Audio Sub-Scenes.

3      Syntax

https://schemas.mpai.community/CAE1/V2.2/data/AudioSceneDescriptors.json

4      Semantics

Label Size Description
Header N1 Bytes Audio Scene Descriptors Header
– Standard 9 Bytes The characters “OSD-ASD-V”
– Version N2 Bytes Major version – 1 or 2 characters
– Dot-separator 1 Byte The character “.”
– Subversion N3 Bytes Minor version – 1 or 2 characters
MInstanceID N4 Bytes Identifier of M-Instance.
AudioSceneDescriptorsID N5 Bytes Identifier of the Audio Scene Descriptors.
AudioSceneSpaceTime N6 Bytes Space-Time of Audio Scene.
AudioObjectCount N7 Bytes # of Audio Objects in Audio Scene
AudioObjects[] N8 Bytes Set of Audio Objects in Audio Scene
– AudioObjectData N9 Bytes Audio Object not belonging to an Audio Sub-Scene.
– AudioObjectSpaceTime N10 Bytes Audio Object’s Space-Time info.
AudioSubSceneCount N11 Bytes # of Audio Sub-Scenes in Audio Scene
AudioSubScenes[] N12 Bytes Set of Audio Sub-Scenes in Audio Scene
– AudioSubSceneData N13 Bytes Data of Audio Sub-Scene
– AudioSubSceneSpaceTime N14 Bytes Audio Sub-Scene’s Space-Time info
DescrMetadata N15 Bytes Descriptive Metadata

5     Conformance Testing

A Data instance Conforms with CAE-USC V2.3 Data Types Audio Scene Descriptors (CAE-ASD) if

  1. The JSON Data validate against the Audio Scene Descriptors’ JSON Schema.
  2. The Data in the Audio Scene Descriptors’ JSON Schema:
    1. Have the specified types.
    2. Validate against their JSON Schemas
    3. Conform with their Data Qualifiers if present.

6     Performance Assessment