install go2rtc on bob

2026-04-04 19:36:14 +02:00
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+# Home Accessory Protocol
+
+> PS. Character = Characteristic
+
+**Device** - HomeKit end device (swith, camera, etc)
+
+- mDNS name: `MyCamera._hap._tcp.local.`
+- DeviceID - mac-like: `0E:AA:CE:2B:35:71`
+- HomeKit device is described by:
+  - one or more `Accessories` - has `AID` and `Services`  
+  - `Services` - has `IID`, `Type` and `Characters`  
+  - `Characters` - has `IID`, `Type`, `Format` and `Value`
+
+**Client** - HomeKit client (iPhone, iPad, MacBook or opensource library)
+
+- ClientID - static random UUID
+- ClientPublic/ClientPrivate - static random 32 byte keypair
+- can pair with Device (exchange ClientID/ClientPublic, ServerID/ServerPublic using Pin)
+- can auth to Device using ClientPrivate
+- holding persistant Secure connection to device
+- can read device Accessories
+- can read and write device Characters
+- can subscribe on device Characters change (Event)
+
+**Server** - HomeKit server (soft on end device or opensource library)
+
+- ServerID - same as DeviceID (using for Client auth)
+- ServerPublic/ServerPrivate - static random 32 byte keypair
+
+## AAC ELD 
+
+Requires ffmpeg built with `--enable-libfdk-aac`
+
+```
+-acodec libfdk_aac -aprofile aac_eld 
+```
+
+| SampleRate | RTPTime | constantDuration   | objectType   |
+|------------|---------|--------------------|--------------|
+| 8000       | 60      | =8000/1000*60=480  | 39 (AAC ELD) |
+| 16000      | 30      | =16000/1000*30=480 | 39 (AAC ELD) |
+| 24000      | 20      | =24000/1000*20=480 | 39 (AAC ELD) |
+| 16000      | 60      | =16000/1000*60=960 | 23 (AAC LD)  |
+| 24000      | 40      | =24000/1000*40=960 | 23 (AAC LD)  |
+
+## Useful links
+
+- https://github.com/apple/HomeKitADK/blob/master/Documentation/crypto.md
+- https://github.com/apple/HomeKitADK/blob/master/HAP/HAPPairingPairSetup.c
+- [Extracting HomeKit Pairing Keys](https://pvieito.com/2019/12/extract-homekit-pairing-keys)
+- [HAP in AirPlay2 receiver](https://github.com/openairplay/airplay2-receiver/blob/master/ap2/pairing/hap.py)
+- [HomeKit Secure Video Unofficial Specification](https://github.com/Supereg/secure-video-specification)
+- [Homebridge Camera FFmpeg](https://sunoo.github.io/homebridge-camera-ffmpeg/configs/)
+- https://github.com/ljezny/Particle-HAP/blob/master/HAP-Specification-Non-Commercial-Version.pdf