Remote Audio Output Protocol
| Communication protocol | |
| Abbreviation | RAOP |
|---|---|
| Purpose | Internet streaming |
| Developer(s) | Apple Inc. |
| Based on | RTSP / RTP |
| OSI layer | Application layer (7) |
| Hardware | AirPort Express, Apple TV |
| Internet protocol suite |
|---|
| Application layer |
| Transport layer |
| Internet layer |
| Link layer |
Remote Audio Output Protocol (RAOP) is an Internet streaming protocol based on RTSP / RTP authored by Apple Inc.[1][2] It powers the AirPlay technology built into AirPort Express wireless (802.11b/g/n) access point as well as the Apple TV.[2]
The major difference from RTSP is an initial asymmetric key verification made by iTunes to verify it is communicating with an AirPort Express or an Apple TV (as opposed to a simulation), and vice versa. The data channel is also encrypted by AES, with a random key protected by the asymmetric key mentioned above.[citation needed]
The RSA public key stored in iTunes was extracted by Jon Lech Johansen, enabling third-party software to stream music to an AirPort Express.[3]
The RSA private key stored in the AirPort Express was extracted by James Laird, enabling simulation of an Airport Express.[4]
The Shairport-sync application which emulates Airport Express hardware is available.[5]
References
- ^ "Unofficial AirPlay Protocol Specification". nto.github.io. Retrieved 20 October 2019.
- ^ a b "Technical note to describe the Remote Audio Access Protocol (RAOP) as used in Apple iTunes to stream music to the Airport Express". XMMS2 organization wiki. xmms2. 7 October 2019. Retrieved 20 October 2019.
- ^ "[vlc-devel] commit: Comment for myself ( Rémi Denis-Courmont )". Mailman.videolan.org. 2008-01-02. Retrieved 2012-02-10.
- ^ "[vlc-devel] RAOP/Airtunes". Mailman.videolan.org. 8 April 2011. Retrieved 2012-02-10.
- ^ "shairport-sync". github.com. Retrieved 2016-09-16.
External links
- Technical note to describe the Remote Audio Access Protocol (RAOP) as used in Apple iTunes to stream music to the Airport Express (ApEx)
- RAOP-play an open source implementation of the protocol