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carried by a different protocol (RTP for example), and the RTSP Request URI (Universal Resource Identifier) contains the absolute URI. We have already stated that media travels over UDP in preference to TCP, unless UDP traffic is blocked by a firewall, but it is worth mentioning that Real Server uses one of two packet formats for sending media data to an RTSP client. These are standard RTP and RealNetworks Real Data Transport (RDT). When data must be sent using TCP rather than UDP, data is interleaved with the RTSP control stream. When data is being delivered via UDP, this can either be multicast UDP or unicast UDP. When the RTSP client selects RTP delivery over UDP, it sets up three network channels with the RTSP server (Figure 2.23). A fully bidirectional TCP connection is used for control and negotiation. A unidirectional channel is used for media delivery using RTP packet format. A third full-duplex UDP channel called RTCP (Real Time Control Protocol) is used to provide synchronization to the client and packet loss information to the server.
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Figure 2.23 RTSP communications with UDP.
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When data is delivered using RDT, the RTSP client again sets up three network channels with the RTSP server (Figure 2.24). The only difference between this configuration and the one previously described is that the third channel is a unidirectional UDP path from the client to the server to request that the server re-send lost UDP media data packets.
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Figure 2.24 RTSP communications with RDT.
RTSP Player
RTSP Server
UDP Data Connection
UDP Resend Requests
2
In the case where UDP transport of media data is impossible, media data may be formed into packets using RTP or RDT and carried using TCP. In this scenario, a single full-duplex TCP connection is used for both control and media delivery from the RTSP server to the client (Figure 2.25). The data stream and the RTSP control stream are merely interleaved.
TCP Control and Data Connection
Figure 2.25 RTSP communications with TCP.
RTSP Player RTSP Server
An RTSP server typically holds three states about a client (Figure 2.26). There is the initial state, where there is no client connected; the ready state, where the client has established a connection but is not playing the media; and finally the self-evident playing state.
Figure 2.26 RTSP state machine.
Initial
SETUP
PLAY
Ready
Playing
TEARDOWN
PAUSE
Real Servers can also serve QuickTime content, as well as supporting .MOV, .AVI, and .WAV files. However, there are some limitations with the Real Server s support of QuickTime. Real Server 8 can stream Apple s QuickTime 4 clips encoded with any codec and hinted for streaming to Apple s QuickTime 4 player. Hinted QuickTime 4 clips encoded with a standards-based codec can stream to RealPlayer 8 (H.261, H.263, and .MP3, but not Sorenson, Cinepak, Qualcomm PureVoice, or Qdesign). RealServer 8 does not support earlier versions of QuickTime (e.g., QuickTime 3). Real Server ignores any QuickTime
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tracks other than video or audio. Scripting commands, for example, are discarded. Live broadcasts of QuickTime can be supported using Sorenson s Broadcaster product, but archiving of live broadcasts in QuickTime is not possible. It was not clear whether or not QuickTime 5 was supported, though this is, at the time of writing, the current version. There are no less than five flavors of multicast support in all Real Servers. These are:
IP multicast RTP multicast UDP multicast TCP/IP multicast HTTP multicast
At present, due to the lack of standardized multicast support on the public Internet, multicast is useful only for intracasting applications, or in situations where the entire network supports multicasting. Real Servers run on Windows NT, Linux, Sun s Solaris, HP/UX, IBM/AIX, and Compaq Tru64. All Real Servers support live and on-demand broadcasting, SMIL, SureStream, bandwidth management and Java. RealNetworks has a service called RBN (Real Broadcast Network), which is a streaming media hosting outsource for content producers who do not wish to host their own streaming media, whether a live one-time event, or around-the-clock live or on-demand programming. As part of the company s RealOne platform, the RealOne Services include RealOne Music (a digital music subscription service) and the RealOne news-tosports to souffl s multimedia programming portal. One presumes that the RealOne offerings are hosted on the company s Real Broadcast Network. At present, RealNetworks supports two players: Real Player 8 and the newly released RealOne Player. RealNetworks claims to have distributed 200 million copies of Real Player. RealOne player is a threepane experience, including a media playback window, a related information window, and a media browser. This allows users to find content, play streaming and downloaded content, organize their audio and video in a personalized library, and take music away from the desktop either on CD-R as a compatible audio CD or MP3 collection, or else download music from the desktop to a portable MP3 player. RealOne Player integrates with the RealOne subscription service, which offers music, sports, entertainment, and news programming. Most of the content is repurposed broadcast television programs. The RealOne Music subscription service also allows consumers to safely and legally download and stream
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