设备自动发现功能包括设备接入网络后，自动申报自己的名称，提供哪些服务等.
Bonjour for macOS and iOS
Bonjour, also known as zero-configuration networking, enables automatic discovery of devices and services on a local network using industry standard IP protocols. Bonjour makes it easy to discover, publish, and resolve network services with a sophisticated, easy-to-use programming interface that is accessible from Cocoa, Ruby, Python, and other languages.
Bonjour is not only based on open Internet standards, our implementation is also available as Open Source under the Apache 2.0 license. It is built into most modern printers and many other consumer products.
苹果AirPlay 设备，比如Apple TV通过Bonjour发布自己的两个服务:
- RAOP
name value description txtvers 1 TXT record version 1 ch 2 audio channels: stereo cn 0,1,2,3 audio codecs et 0,3,5 supported encryption types md 0,1,2 supported metadata types pw false does the speaker require a password? sr 44100 audio sample rate: 44100 Hz ss 16 audio sample size: 16-bit tp UDP supported transport: TCP or UDP vs 130.14 server version 130.14 am AppleTV2,1 device model
java
TXTRecord txtRecord = new TXTRecord();
txtRecord.set("ch", "2");
txtRecord.set("cn", "0,1,2,3");
txtRecord.set("da", "true");
txtRecord.set("et", "0,3,5");
txtRecord.set("vv", "2");
txtRecord.set("ft", "0x5A7FFFF7,0x1E");
txtRecord.set("am", "AppleTV2,1");
txtRecord.set("md", "0,1,2");
txtRecord.set("rhd", "5.6.0.0");
txtRecord.set("pw", "false");
txtRecord.set("sr", "44100");
txtRecord.set("ss", "16");
txtRecord.set("sv", "false");
txtRecord.set("tp", "UDP");
txtRecord.set("txtvers", "1");
txtRecord.set("sf", "0x4");
txtRecord.set("vs", "220.68");
txtRecord.set("vn", "65537");
txtRecord.set("pk", "b07727d6f6cd6e08b58ede525ec3cdeaa252ad9f683feb212ef8a205246554e7");
mRaopRegister = new Register(txtRecord, mDeviceName, "_raop._tcp", "local.", "", 49152);
- AirPlay service
name value description model AppleTV2,1 device model deviceid 58:55:CA:1A:E2:88 MAC address of the device features 0x39f7 bitfield of supported features pw 1 server is password protected
其中features具体含义如下:
| bit | name | description |
|---|---|---|
| 0 | Video video supported | |
| 1 | Photo photo supported | |
| 2 | VideoFairPlay video protected with FairPlay DRM | |
| 3 | VideoVolumeControl volume control supported for videos | |
| 4 | VideoHTTPLiveStreams http live streaming supported | |
| 5 | Slideshow slideshow supported | |
| 7 | Screen mirroring supported | |
| 8 | ScreenRotate screen rotation supported | |
| 9 | Audio audio supported | |
| 11 | AudioRedundant audio packet redundancy supported | |
| 12 | FPSAPv2pt5_AES_GCM FairPlay secure auth supported | |
| 13 | PhotoCaching photo preloading supported |
java
TXTRecord txtRecord = new TXTRecord();
txtRecord.set("deviceid", mMacAddress);
txtRecord.set("features", "0x5A7FFFF7,0x1E");
txtRecord.set("srcvers", "220.68");
txtRecord.set("flags", "0x4");
txtRecord.set("vv", "2");
txtRecord.set("model", "AppleTV2,1");
txtRecord.set("pw", "false");
txtRecord.set("rhd", "5.6.0.0");
txtRecord.set("pk", "b07727d6f6cd6e08b58ede525ec3cdeaa252ad9f683feb212ef8a205246554e7");
txtRecord.set("pi", "2e388006-13ba-4041-9a67-25dd4a43d536");
this.mAirplayRegister = new Register(txtRecord, this.mDeviceName, "_airplay._tcp", "local.", "", 7000);