Definition

Audio Scene Descriptors is a Data Type that includes the Geometry and the Objects of an Audio Scene.

Syntax

https://schemas.mpai.community/CAE/V2.1/data/AudioSceneDescriptors.json

Semantics

Label Size Description
HEADER 9 Bytes
·       Standard 7 Bytes The string CAE-ASD
·       Version 1 Byte Major version
·       Subversion 1 Byte Minor
ASDID 16 Bytes UUID Identifier of the sequence of Audio Scene Descriptors.
Time 17 Bytes Collects various data expressed with bits
·       TimeType 0 bit 0=Relative: time starts at 0000/00/00T00:00
1=Absolute: time starts at 1970/01/01T00:00.
·       Reserved 1-7 bits reserved
·       StartTime 8 Bytes Start of current Audio Scene Descriptors (in µs).
·       EndTime 8 Bytes End of current Audio Scene Descriptors (in µs).
AudioObjectCount 1 Byte Number of Audio Objects in the Audio Scene.
AudioObjectsData N1 Bytes Data associated to each Audio Object.
·       AudioObjectID 1 Byte ID of a specific Audio Object in the Audio Scene.
·       SamplingRate 0-3 bits 0:8, 1:16, 2:24, 3:32, 4:44.1, 5:48, 6: 64, 7: 96, 8: 192 (all kHz)
·       SampleType 4-5 bits 0:16, 1:24, 2:32, 3:64 (all bits/sample)
·       Reserved 6-7 bits
·       Spatial Attitude N2 Bytes According to MPAI-OSD V1
·       AudioObject N3 Bytes
◦   FormatID 1 Byte Audio Object Format Identifier
◦   ObjectLength 4 Bytes Number of Bytes in Audio Object
◦   DataInObject N4 Bytes Data of Audio Object