WEB REAL-TIME Communication Use-cases & Requirements draft-holmberg-rtcweb-ucreqs Christer Holmberg Stefan Håkansson Göran AP Eriksson
PURPOSE of the draft › DEFINE USE-CASES › DERIVE REQUIREMENTS, BASED ON THE USE-CASES draft-holmberg-rtcweb-ucreqs | 2011 -03 -27 | Page 2
SCOPE of the draft › CURRENT FOCUS: – Real-Time Media Streams requirements – Audio and video – Browser/web-app functional separation › Browser requirements › Browser/Web-app API requirements › CURRENTLY NOT COVERED: – Privacy requirements – Web server/browser signalling – Datagram traffic draft-holmberg-rtcweb-ucreqs | 2011 -03 -27 | Page 3
scope OF THE DRAFT WEB SERVER/BROWSER SIGNALLING WEB APP (JS) API/BROWSER API RTP WEB BROWSER draft-holmberg-rtcweb-ucreqs | 2011 -03 -27 | Page 4 NAT/FW
USE-CASE: Simple Video Communication Service › Users have loaded, and logged into, a video communication web application into their browsers, provided by the same service provider. › Web service publishes information about user login status, by pushing updates to the web application in the browsers. › By selecting an online peer user, a 1 -1 video communication session between the browsers of the peers is initiated. › Self-view, remote video, display size, mute/pause. draft-holmberg-rtcweb-ucreqs | 2011 -03 -27 | Page 5
USE-CASE: Multiparty video communication › Simple video communication service (see previous slide) is extended by allowing multiparty sessions. › No central server. › Web application pans the audio from different participants differently when rendering the audio. › Users can change how the different participants are placed in the (virtual) room. › Each video stream received is by default displayed in a thumbnail frame within the browser, draft-holmberg-rtcweb-ucreqs | 2011 -03 -27 | Page 6
USE-CASE: Multiparty on-line game with voice communication › Voice part of the multiparty video communication application is used in the context of an on-line game. › Received voice and audio media rendered together with game sound objects (possibly from different source than voice and audio). draft-holmberg-rtcweb-ucreqs | 2011 -03 -27 | Page 7
USE-CASE: Video conferencing system with central server › System supporting establishment of multiparty video sessions using a central conference server. › Participants send an audio stream to central server. › Central server mixes the audio streams and sends towards participants a mixed stereo stream. › Participants send two video streams towards server, one low resolution and one high resolution, to be displayed in main window resp thumbnail. › Server selects what video streams to be forwarded as main- and thumbnail videos, based on speech activity. › Users can not can establish a Virtual Private Network (VPN) to access service, if not physically connected to the network where service is located. draft-holmberg-rtcweb-ucreqs | 2011 -03 -27 | Page 8
USE-CASE: Hockey game viewer › Ice-hockey club uses application that enables talent scouts to, in realtime, show and discuss games and players with the club manager. › Talent scouts use mobile phone with two cameras, one front-facing and one rear facing. › Club manager uses a desktop for viewing the game and discussing with the talent scout. › Desktop screen covered with video captured by front facing camera of mobile phone, with overlaid thumbnail with video captured by rear facing camera. › Mobile phone screen covered by a self view of the front facing camera, with overlaid thumbnail rear facing cameras view. draft-holmberg-rtcweb-ucreqs | 2011 -03 -27 | Page 9
USE-CASE: Telephony terminal › Mobile telephony operator allows customers to use web browser to access operator services. › Web user can place and receive calls in the same way as when using a normal mobile phone. › When call is received or placed, identity of remote user will be shown in the same manner as when a mobile phone used. draft-holmberg-rtcweb-ucreqs | 2011 -03 -27 | Page 10
BROWSER REQS IN A NUTSHELL › ACCESS TO MEDIA INPUT DEVICES – Camera, microphone, … › MEDIA STREAM DETECTION, PROCESSING & TRANSMITING › MEDIA STREAM QUALITY – Rate, jitter, packet loss, echo control › AUDIO/VIDEO SYNCHRONIZATION › MIXING OF STREAMS FROM DIFFERENT SOURCES › CODECS › NAT/FW TRAVERSAL SUPPORT FOR MEDIA STREAMS › LEGACY INTEROPERABILITY draft-holmberg-rtcweb-ucreqs | 2011 -03 -27 | Page 11
API REQS IN a NUTSHELL › USE & CONTROL BROWSER FUNCTIONS – Start/stop sending/receiving of media streams – Mute/pause media streams – Stream layout – Media format (codec) › BROWSER EVENTS – Status of media stream – Media streams no more received › QUERY BROWSER FUNCTIONS (input devices, stream capabilities, codecs…) draft-holmberg-rtcweb-ucreqs | 2011 -03 -27 | Page 12
THANK YOU FOR LISTENING! CHRISTER. HOLMBERG@ERICSSON. COM draft-holmberg-rtcweb-ucreqs | 2011 -03 -27 | Page 13
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