1 Giodi Giorgi Gruppo RETI di TELECOMUNICAZIONI Dipartimento di Ingegneria dell’Informazione - Università di Pisa Pisa, 6 Dicembre 2005 Giodi Giorgi An Integrated Platform for Multimedia Applications VIII Workshop PisaTel 2005

2 Giodi Giorgi Technologies & components System and Services –Distance Learning –Voice over IP –Video steaming & Video on Demand –TV broadcasting Network infrastructure –Streaming platform –Multi-Access Inter-Domain architecture for dynamic setup of QoS-IP services that does not interfere with the background signaling –End-to-end dynamic and tailored Quality of Service IWU (Inter Working Unit)

3 Giodi Giorgi Distributed trial

4 Giodi Giorgi Distance Learning Requirements Students –To follow on-line lesson using commonly available software tools (RealOne Player, NetMeeting, web browser) with different quality level, depending on his/her type of access to network Teacher –Oriented to content providing, should produce enhanced contents entailing video and audio, external data and auxiliary teaching tools Software and equipment –a video camera –a video capture card (Osprey 230) –a video encoder (Helix DNA producer) –a video broadcasting server (Helix DNA server) –a software to create on-demand multimedia presentations and to synchronize audio and video with PowerPoint slides and other media learning objects. –WEB interface and Content Management server –client-side software (RealOne video Client, WEB browser, VoIP terminal)

5 Giodi Giorgi Distance learning: portal WEB interface login Language selection Available features differentiated for users and groups User functionalities set by administrator Available tools: file storage, calendar/diary, address book, instant messaging, on-line users... Each user can belong to one or more groups (associated to each course) Group functionalities set by admin Available tools: file storage, forum, instant messaging, lessons, projects …

6 Giodi Giorgi Distance learning: student side Unicast and multicast live streaming MPEG-4 real-time multi-rate encoding Encoding rate from 128 Kb/s to 1.5 Mb/s, with resolutions up to Frame-accurate synchronization of audio/video streams with dynamic remote learning objects Transparent storage of real-time encoded lessons Teacher interaction by means of instant messaging tools

7 Giodi Giorgi Distance learning: teacher side Slideshows loaded into the WEB server The teacher can see the preview of his slide at any time During the lesson, the slide inclusion into the live stream is provided by means of simple click

8 Giodi Giorgi Distance learning WEB interfaces login (stud/teach)

9 Giodi Giorgi Distance learning WEB interfaces login (stud/teach) teachers: access WEB page with slideshow

10 Giodi Giorgi Distance learning WEB interfaces login (stud/teach) teachers: access WEB page with slideshow students: start RealOne to see video/slides, browser to view additional data and send messages

11 Giodi Giorgi WEB Server PPT ExporterSlideshow Before the lesson.ppt.html During the lesson Teacher GUI EncoderPlayer sources URL a/v Server Simple application which converts slides into HTML pages and transfers them to WEB server Distance learning: content production

12 Giodi Giorgi Distance learning: content production WEB Server PPT ExporterSlideshow Before the lesson.ppt.html During the lesson Teacher GUI EncoderPlayer sources URL a/v Server WEB interface which displays slides and includes their URL in the stream after a teacher click

13 Giodi Giorgi Distance learning: content recorder During the lesson Configuration GUI Encoder sources a/v Server GUI allows to configure easily the main producer options which are relevant for lesson production purposes

14 Giodi Giorgi The whiteboard application The teacher can use any free-hand drawing tool (e.g. Windows Journal for Tablet PC) The application window is periodically captured and sent to an encoding application A video stream containing the text and pictures is created and sent to the video server, which broadcasts it on the network This additional stream is synchronized with the others using SMIL (Synchronized Multimedia Integration Language )

15 Giodi Giorgi First case study

16 Giodi Giorgi Voice over IP Software VoIP terminal

17 Giodi Giorgi Voice over IP Software VoIP terminal Gatekeeper registration

18 Giodi Giorgi Voice over IP Software VoIP terminal Gatekeeper registration H.323 call (gatekeeper-routed)

19 Giodi Giorgi Video on Demand WEB interfaces to select the content from the archive of pre-loaded films –Helix MPEG-4 video server, open source project from Real

20 Giodi Giorgi Video on Demand WEB interfaces to select the content from the archive of pre-loaded films –Helix MPEG-4 video server, open source project from Real Video streaming –RealOne video Client

21 Giodi Giorgi TV broadcasting WEB interfaces to select the channel –MPEG4IP: MPEG-4, MP3/AAC broadcaster and file recorder open source project –Darwin Streaming Server: open source project from Apple

22 Giodi Giorgi TV broadcasting WEB interfaces to select the channel –MPEG4IP: MPEG-4, MP3/AAC broadcaster and file recorder open source project –Darwin Streaming Server: open source project from Apple TV channel reception –RealOne player with EnVivio plugin installed

23 Giodi Giorgi Technologies & components System and Services –Distance Learning –Voice over IP –Video steaming & Video on Demand –TV broadcasting Network infrastructure –Streaming platform –Multi-Access Inter-Domain architecture for dynamic setup of QoS-IP services that does not interfere with the background signaling –End-to-end dynamic and tailored Quality of Service IWU (Inter Working Unit)

24 Giodi Giorgi Streaming platform Generalized and automatic IP Control Plane architecture (i.e. the Multi-Access Inter-Domain – MAID) for the dynamic and tailored configuration of QoS-IP services, carrying the multimedia streams across a MPLS/DiffServ IP backbone. HTTP Server Remote Terminals (ADSL, Ethernet, Wireless) Encoding/ Streaming Server HTTP/RTSP QoS-IPGeographical Network layer

25 Giodi Giorgi The MAID scenario Different protocols/technologies are used in the access network (e.g. H.323, SIP, MPEG-4, etc.) … and the required QoS is often not explicitly declared in the access signaling flow (e.g. H.323) UNI H.323 RSVP SIP MPEG-4 IP DiffServ/MPLS network Multi-Protocol Access network Multi-Access Border Router MA-BR Multi-Access Border Router MA-BR Service Requests Service Requests MPLS Bandwidth Broker MAID-BB Bandwidth Broker MAID-BB COPS-MAID MAMA IDID

26 Giodi Giorgi The MAID scenario IP DiffServ/MPLS network Multi-Access Border Router MA-BR Multi-Access Border Router MA-BR Bandwidth Broker MAID-BB Bandwidth Broker MAID-BB COPS-MAID Two basic elements in our MAID architecture: The MAID Bandwidth Broker (BB) –manages network resources –admission control and policies –configures core routers –inter-domain communications The Multiple-Access Border Router (MA-BR) –must understand as much as possible QoS semantics –translates the access QoS into interior QoS syntax (complexity on the BR) appropriate Inter Working Units (IWUs) are used to map protocol specific messages into generalized client messages. –triggers the setup of QoS-IP services upon receiving QoS requests from the access networks

27 Giodi Giorgi e-class scenario DiffServ/MPLS network