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AirPlay 投屏协议.docx

发布时间：2022-05-31 发布人：admin 分类：说明书 资料大小：0.11M 资料格式：docx 举报 版权申诉
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    Unofficial AirPlay Protocol Specification
    1. Introduction
    2. Service Discovery
    2.1. AirTunes service
    Audio codecs
    Encryption Types
    Metadata Types
    2.2. AirPlay Service
    3. Photos
    3.1. HTTP requests
    GET /slideshow-features
    PUT /photo
    PUT /slideshows/1
    POST /stop
    3.2. Events
    Photo
    Slideshow
    3.3. Photo Caching
    3.4. Slideshows
    4. Video
    4.1. HTTP requests
    GET /server-info
    POST /play
    POST /scrub
    POST /rate
    POST /stop
    GET /scrub
    GET /playback-info
    PUT /setProperty
    GET /getProperty
    4.2. Events
    5. Audio
    5.1. RTSP requests
    OPTIONS
    ANNOUNCE
    SETUP
    RECORD
    FLUSH
    TEARDOWN
    5.2. RTP Streams
    Audio packets
    Sync packets
    Retransmit packets
    Timing packets
    5.3. Volume Control
    5.4. Metadata
    Track Informations
    Cover Artwork
    Playback Progress
    5.5. AirPort Express Authentication
    Client side
    Server side
    Client side
    5.6. Remote Control
    6. Screen Mirroring
    6.1. HTTP requests
    GET /stream.xml
    POST /stream
    6.2. Stream Packets
    Codec Data
    Video Bitstream
    Heartbeat
    6.3. Time Synchronization
    7. Password Protection
    8. History
    9. Resources
    9.1. IETF RFCs
    9.2. IETF drafts
    9.3. Apple Protocols
    Unofficial AirPlay Protocol Specification 1. Introduction 2. Service Discovery  o 2.1. AirTunes service o 2.2. AirPlay Service 3. Photos  o 3.1. HTTP requests o 3.2. Events o 3.3. Photo Caching o 3.4. Slideshows 4. Video  o 4.1. HTTP requests o 4.2. Events 5. Audio  o 5.1. RTSP requests o 5.2. RTP Streams o 5.3. Volume Control o 5.4. Metadata o 5.5. AirPort Express Authentication o 5.6. Remote Control 6. Screen Mirroring  o 6.1. HTTP requests o 6.2. Stream Packets o 6.3. Time Synchronization 7. Password Protection 8. History 9. Resources  o 9.1. IETF RFCs
    o 9.2. IETF drafts o 9.3. Apple Protocols 1. Introduction AirPlay is a family of protocols implemented by Apple to view various types of media content on the Apple TVfrom any iOS device or iTunes. In this documentation, “iOS device” refers to an iPhone, iPod touch or iPad. The following scenarios are supported by AirPlay:  Display photos and slideshows from an iOS device.  Stream audio from an iOS device or iTunes.  Display videos from an iOS device or iTunes.  Show the screen content from an iOS device or OS X Mountain Lion. This is called AirPlay Mirroring. It requires hardware capable of encoding live video without taking too much CPU, so it is only available on iPhone 4S, iPad 2, the new iPad, and Macs with Sandy Bridge CPUs. Audio streaming is also supported from an iOS device or iTunes to an AirPort Express base station or a 3rd party AirPlay-enabled audio device. Initially this was called AirTunes, but it was later renamed to AirPlay when Apple added video support for the Apple TV. This document describes these protocols, as implemented in Apple TV software version 5.0, iOS 5.1 and iTunes 10.6. They are based on well-known standard networking protocols such as Multicast DNS, HTTP, RTSP, RTP or NTP, with custom extensions. All these information have been gathered by using various techniques of reverse engineering, so they might be somewhat inaccurate and incomplete. Moreover, this document does not explain how to circumvent any kind of security implemented by Apple:  It does not give any RSA keys.
      It does not explain how to decode iTunes videos protected with the FairPlay DRM. It does not explain the FairPlay authentication (SAPv2.5) used by iOS devices and OS X Mountain Lion to protect audio and screen content. Please don’t e-mail me about this, I won’t reply. In fact, none of this is actually required to be able to view media content on Apple TV. 2. Service Discovery AirPlay does not require any configuration to be able to find compatible devices on the network, thanks to DNS-based service discovery, based on multicast DNS, aka Bonjour. An AirPlay device such as the Apple TV publishes two services. The first one is RAOP (Remote Audio Output Protocol), used for audio streaming, and the other one is the AirPlay service, for photo and video content. 2.1. AirTunes service RAOP SERVICE FROM APPLE TV name: 5855CA1AE288@Apple TV type: _raop._tcp port: 49152 txt: txtvers=1 ch=2
    cn=0,1,2,3 da=true et=0,3,5 md=0,1,2 pw=false sv=false sr=44100 ss=16 tp=UDP vn=65537 vs=130.14 am=AppleTV2,1 sf=0x4 The name is formed using the MAC address of the device and the name of the remote speaker which will be shown by the clients. The following fields appear in the TXT record: NAME VALUE DESCRIPTION txtvers 1 TXT record version 1
    NAME VALUE DESCRIPTION ch cn et md pw sr ss tp vs am 2 audio channels: stereo 0,1,2,3 audio codecs 0,3,5 0,1,2 false supported encryption types supported metadata types does the speaker require a password? 44100 audio sample rate: 44100 Hz 16 UDP audio sample size: 16-bit supported transport: TCP or UDP 130.14 server version 130.14 AppleTV2,1 device model Audio codecs CN DESCRIPTION
    CN DESCRIPTION 0 1 2 3 PCM Apple Lossless (ALAC) AAC AAC ELD (Enhanced Low Delay) Encryption Types ET DESCRIPTION 0 1 3 4 5 no encryption RSA (AirPort Express) FairPlay MFiSAP (3rd-party devices) FairPlay SAPv2.5 Metadata Types
    MD DESCRIPTION 0 1 2 text artwork progress 2.2. AirPlay Service AIRPLAY SERVICE name: Apple TV type: _airplay._tcp port: 7000 txt: deviceid=58:55:CA:1A:E2:88 features=0x39f7 model=AppleTV2,1 srcvers=130.14 The following fields are available in the TXT record: NAME VALUE DESCRIPTION
    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 The pw field appears only if the AirPlay server is password protected. Otherwise it is not included in the TXT record. The features bitfield allows the following features to be defined: BIT NAME Video Photo DESCRIPTION video supported photo supported 0 1 2 3 4 VideoFairPlay video protected with FairPlay DRM VideoVolumeControl volume control supported for videos VideoHTTPLiveStreams http live streaming supported
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