Function concatInitDataIdAndCertificate

concatInitDataIdAndCertificate(
    initData: Uint16Array,
    id: string | Uint16Array<ArrayBufferLike>,
    cert: Uint8Array,
): Uint8Array
Concatenates InitData, ID, and Certificate for FairPlay DRM.
Parameters
- initData: Uint16Array
  The initialization data (PSSH box)
- id: string | Uint16Array<ArrayBufferLike>
  The content ID (string or Uint16Array)
- cert: Uint8Array
  The application certificate (Uint8Array)
Returns Uint8Array
A Uint8Array containing the concatenated data
Example
```
const result = concatInitDataIdAndCertificate(initData, contentId, appCertData)

// It should be 8-bit integer type and contain data
deepStrictEqual(result instanceof Uint8Array, true)
deepStrictEqual(result.length > 0, true)
```
- Defined in fairplay/concatInitDataIdAndCertificate.ts:17