File Extension: `.frad`

Fixed Header

Fixed Header Table

	`0x0`	`0x1`	`0x2`	`0x3`	`0x4`	`0x5`	`0x6`	`0x7`
`0x00`	`0x66`	`0x52`	`0x61`	`0x64`
`0x08`	Header length	———	———	———	———	———	———	———
`0x10`
…
`0x30`
`0x38`

`0x00`~`0x03`: File Signature, fRad

representing Fourier Analogue-in-Digital

`0x04`~`0x07`: Reserved

`0x08`~`0x0f`: Total header length(uint64 BE)

Up to 16 Exbibytes including Fixed header space

`0x10`~`0x3f`: Reserved

Metadata blocks

Metadata block	`0x0`	`0x1`	`0x2`	`0x3`	`0x4`	`0x5`	`0x6`	`0x7`
`0x00`	Block Type	———	Block data	…

`0x00`~`0x01`: Metadata block type

`0x02`~: Metadata block data

Metadata

Audio Stream Frame (9 Bytes)