1 Definition
A data structure containing Audio Objects packaged with Audio Scene Geometry and Time Code according to the structure specified in Table 1.
2 Functional Requirements
3 Syntax
4 Semantics
Table 1 – Multichannel Audio Stream Semantics
| Label | Size | Description |
| Header | N1 Bytes | Multichannel Audio Header |
| – Standard and Data Type | 9 Bytes | The characters “CAE-MCA-V” |
| – Version | N2 Bytes | Major MPAI-CAE version |
| – Dot-separator | 1 Byte | The character “.” |
| – Subversion | N3 Byte | Minor MPAI-CAE version |
| MInstanceID | N4 Bytes | ID of the Metaverse Instance. |
| MultichannelAudioID | N4 Bytes | Identifier of the Multichannel Audio Stream. |
| BlockInfo | ||
| – BlockIndex | 8 Bytes | Indicates the timing order of the output block. Derived from Audio Scene Geometry. |
| – BlockStart | 8 Bytes | Derived from Audio Scene Geometry. |
| – BlockEnd | 8 Bytes | Derived from Audio Scene Geometry. |
| – BlockSize | 1 Byte | Derived from Audio Scene Geometry. |
| – Checksum | 1 Byte | Checksum is calculated by summing the block and speech header bytes modulo 256. |
| AudioObjectCount | 1 Byte | AudioObjectCount of Audio Scene Geometry. |
| AudioObjectsData | N1 Bytes | |
| – AudioObjectID | 16 Bytes | AudioObjectID in Audio Object. |
| – Sampling Rate | 0-3 bits | SamplingRate of Audio Scene Descriptors. |
| – Sample Type | 4-6 bits | (aka, sample precision) 0:8, 1:16, 2:24, 3:32, 4:64 (bits/sample) |
| – Reserved | 7 bit | |
| – Spatial Attitude | N2 Bytes |
