Published on March 6, 2014
WebRTC Is it ready? Henry 2013
Web RTC Block Diagram
Very Active Community
Some Complexities Designed for P2P communications so includes intricate mechanisms to traverse NAT using STUN, ICE and a TURN server which is a media relay.
Built-in Voice Engine Capabilities ● NetEQ ○ Dynamic jitter buffer management ○ Packet Loss Concealment (PLC) ● Acoustic Echo Canceler (AEC) ○ Removes, in real time, the acoustic echo resulting from the voice being played out coming into the active microphone. ● Noise Reduction (NR) ○ Removes certain types of background noise usually associated with VoIP. (Hiss, fan noise, etc...)
Supported Audio Codecs ● G.711 ● Opus - Free CD Quality codec (Even Stereo) ○ 20ms frames ○ Variable Bit Rate 8K to 64K bps
Built-In Video Engine Video Jitter Buffer ○ Dynamic Jitter Buffer Image Enhancement ○ Remove video noise VP8 Codec ○ Royalty free ○ Full HD 1080p encoding
WebRTC Connection Flow 1. Obtain Local Media (GetUserMedia) 2. Setup Peer Connection (RTCPeerConnection) 3. Attach Media or Data 4. Exchange Offer/Answer (RTCPeerConnection)
Supporting Protocols ● Application Layer: ○ HTTP, WebSocket, SRTP, SDP, ICE/STUN/TURN ● Transport Layer: ○ TLS (TCP), DTLS (UDP), SCTP (for data channel) ● Network Layer: ○ IPv4 & IPv6
Peer Connection Diagram Pure Web
Peer Connection Diagram Over Legacy Network
3rd Party Authentication
Signaling Proprietary ○ RESTful ○ BOSH (long polling) ○ WebSockets Open Standards ○ XMPP over BOSH/WebSockets (14 years) ○ SIP over WebSockets (17 years)
Standards It's a joined effort ● IETF ○ Focus on protocol and interoperability ● W3C ○ Hight level APIs and device control (mic, camera, network) ○ PeerConnection API proposal
Concerns ● Video Codec Patent: ○ Since March 2013 Nokia has asserted a patent claim against HTC and Google for the use of VP8 in Android in a German court ● Browser Support: ○ Chrome, Firefox, and Opera ○ Apple and Microsoft have not publicly shown interest in the support of WebRTC in IE and Safari ○ (Note: Temporary IE supported via Chrome Frame)
Demos Canvas Integration: ● Webcam Toy (GetUserMedia + Canvas) ● Audio Recorder (GetUserMedia + Canvas) Video Chat: ● talky (GetUserMedia + RTCPeerConnection) File Sharing ● Sharefest (GetUserMedia + RTCDataChannel)
More Demos Games: ● Facekat (GetUserMedia + JS head tracking) ● Cube Slam (???)
Tools Browser Tool ● chrome://webrtc-internals/ ● adapter.js (http://www.webrtc. org/interop)
Mobile App Vonage iPhone - https://itunes.apple. com/app/id491391564?mt=8 Vonage Android - https://play.google. com/store/apps/details?id=com.vonage. TimeToCall
FreeSWITCH and WebRTC ● SIP Over WebSockets ● Media over SRTP ● Opus supported Issues: ○ Inconsistent client support ○ DTMF issues (INFO) ○ No video transcoding is supported Note: Asterisks Already supported WebRTC (but only with G.711 codec)
Business Applications ● ● ● ● ● Call Center PAAS (Open Source API) WebRTC enabled SBC Video Conference Outsourcing Development Vendor
Call Center Applications Teledini - Display web visitor key information when call arrives. Receive call from browser.
Hardware Solution Genband - WebRTC to VoIP gateway with RESTful API Ingate - VoIP enabled smart enterprise firewall now optimized also for WebRTC. Realtime traffic shaping Sansay - WebSBC, REST API, Proprietary signaling (not SIP)
Video Conference (PAAS) Bistri - Free video chat service that binds all your social network contacts.
Other PubNub - High performance and low latency communication of arbitrary data
Using WebRTC on Mobile Device ● Open Source VoIP engine (and Video) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ Active community support PLC - Packet Loss Concealment Jitter Buffer handling CD Quality Codec RTP at the core RTCP implemented for QoS monitoring SRTP for secure media transport NAT traversal by ICE ECHO Cancellation & Noise Reduction Mobile Integration contributed by Vonage Everything one might need to build their own Mobile Native Client
Presentations from WebRTC conf ● http://www.webrtcworld. com/conference/west/presentations.aspx
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