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1 Institute of Telecommunications Warsaw University of Technology 2015 internet technologies and standards Piotr Gajowniczek Andrzej Bąk Michał Jarociński

2 multimedia in the Internet Voice-over-IP

3 multimedia networking: 3 application types streaming, stored audio, video streaming: can begin playout before downloading entire file stored (at server): can transmit faster than audio/video will be rendered (implies storing/buffering at client) e.g., YouTube, Netflix, Hulu conversational voice/video over IP interactive nature of human-to-human conversation limits delay tolerance e.g., Skype streaming live audio, video e.g., live sporting event (futbol)

4 audio signal amplitude multimedia: audio analog audio signal sampled at constant rate telephone: 8,000 samples/sec CD music: 44,100 samples/sec each sample quantized, i.e., rounded e.g., 28=256 possible quantized values each quantized value represented by bits, e.g., 8 bits for 256 values various codec types quantization error sampling rate (N sample/sec) quantized value of analog value analog signal time

5 Voice-over-IP (VoIP) VoIP end-end-delay requirement: needed to maintain conversational aspect higher delays noticeable, impair interactivity < 150 msec: good > 400 msec bad includes application-level (packetization,playout), network delays session initialization: how does callee advertise IP address, port number, encoding algorithms? value-added services: call forwarding, screening, recording emergency services: 911

6 VoIP: packet loss, delay network loss: IP datagram lost due to network congestion (router buffer overflow) delay loss: IP datagram arrives too late for playout at receiver delays: processing, queueing in network; end-system (sender, receiver) delays typical maximum tolerable delay: 400 ms loss tolerance: depending on voice encoding, loss concealment, packet loss rates between 1% and 10% can be tolerated

7 buffered data delay jitter constant bit rate transmission variable network delay (jitter) client reception constant bit rate playout at client client playout delay time receiver attempts to playout each chunk exactly q msecs after chunk was generated. chunk has time stamp t: play out chunk at t+q chunk arrives after t+q: data arrives too late for playout: data lost tradeoff in choosing q: large q: less packet loss small q: better interactive experience

8 Real-Time Protocol (RTP) RTP specifies packet structure for packets carrying audio, video data RFC 3550 RTP packet provides payload type identification packet sequence numbering time stamping RTP runs in end systems RTP packets encapsulated in UDP segments interoperability: if two VoIP applications run RTP, they may be able to work together

9 RTP header payload type sequence number type time stamp payload type (7 bits): indicates type of encoding currently being used. If sender changes encoding during call, sender informs receiver via payload type field Payload type 0: PCM mu-law, 64 kbps Payload type 3: GSM, 13 kbps Payload type 7: LPC, 2.4 kbps Payload type 26: Motion JPEG Payload type 31: H.261 Payload type 33: MPEG2 video Synchronization Source ID Miscellaneous fields sequence # (16 bits): increment by one for each RTP packet sent detect packet loss, restore packet sequence

10 RTP header payload type sequence number type time stamp Synchronization Source ID Miscellaneous fields timestamp field (32 bits long): sampling instant of first byte in this RTP data packet for audio, timestamp clock increments by one for each sampling period (e.g., each 125 usecs for 8 KHz sampling clock) if application generates chunks of 160 encoded samples, timestamp increases by 160 for each RTP packet when source is active. Timestamp clock continues to increase at constant rate when source is inactive. SSRC field (32 bits long): identifies source of RTP stream. Each stream in RTP session has distinct SSRC

11 Real-Time Control Protocol (RTCP) works in conjunction with RTP each participant in RTP session periodically sends RTCP control packets to all other participants each RTCP packet contains sender and/or receiver reports report statistics useful to application: # packets sent, # packets lost, interarrival jitter feedback used to control performance sender may modify its transmissions based on feedback

12 SIP: Session Initiation Protocol [RFC 3261] what is SIP? IETF end-to-end call establishment and management protocol for multimedia services supports user location, presence, profiles allows call setup (with authorization) allows media media type, encoding negotiation supports session management (modification of session parameters, multiparty conferencing etc.) supports different forms of redirection (e.g. forking) supports WWW interaction/integration defines also SIP addressing (SIP URI; maps mnemonic identifier to current IP address) network servers architecture (registrar, proxy, redirect, location servers)

13 SIP protocol commands responses REGISTER registration of physical address of the client; INVITE call setup/modification; ACK ack. for the final response, BYE ending session; CANCEL breaking transaction; others: SUBSCRIBE, OPTIONS, INFO 1xx - Provisional request received and under processing; 2xx - Success; 3xx - Redirection; 4xx - Client Error request cannot be processed (bad syntax, no authorization etc.); 5xx - Server Error serwer is unable to proces a (viable) request; 6xx - Global Failure transaction a command and all responses; non-invite scenario command, sequence of provisional responses and a final response; INVITE scenario additional ACK command INVITE SIP/2.0 Via: argon.netlab.edu From: Tag=12 To: Call-Id: Cseq: 1 INVITE Contact: Content-type... Content-length... +SDP 200 OK SIP/2.0 Via: sipproxy.netlab.edu Via: argon.netlab.edu From: Tag=23 To: Tag=12 Call-Id: Cseq: 1 INVITE Contact: Content-type... Content-length... + SDP

14 example: setting up call to known IP address Alice Bob INVITE c=in IP m=audio RTP/AVP 0 port 5060 port OK c=in IP m=audio RTP/AVP 3 ACK port Bob's terminal rings Alice s SIP invite message indicates her port number, IP address, encoding she prefers to receive (PCM mlaw) Bob s 200 OK message indicates his port number, IP address, preferred encoding (GSM) port GSM m Law audio port SIP messages can be sent over TCP or UDP; here sent over RTP/UDP time time default SIP port number is 5060

15 SIP INVITE INVITE SIP/2.0 Via: SIP/2.0/UDP From: To: Call-ID: Content-Type: application/sdp Content-Length: 885 c=in IP m=audio RTP/AVP 0 Notes: HTTP message syntax sdp = session description protocol Call-ID is unique for every call Here we don t know Bob s IP address intermediate SIP servers needed Alice sends, receives SIP messages using SIP default port 506 Alice specifies in header that SIP client sends, receives SIP messages over UDP

16 SIP registrar one function of SIP server: registrar when Bob starts SIP client, client sends SIP REGISTER message to Bob s registrar server register message: REGISTER sip:domain.com SIP/2.0 Via: SIP/2.0/UDP From: To: Expires: 3600

17 SIP proxy another function of SIP server: proxy Alice sends invite message to her proxy server contains address proxy responsible for routing SIP messages to callee, possibly through multiple proxies Bob sends response back through same set of SIP proxies proxy returns Bob s SIP response message to Alice contains Bob s IP address SIP proxy analogous to local DNS server plus TCP setup

18 SIP example 2. UMass proxy forwards request to Poly registrar server Poly SIP registrar Poly server returns redirect response, indicating that it should try UMass SIP proxy 1. Jim sends INVITE message to UMass SIP proxy Umass proxy forwards request to Eurecom registrar server SIP response returned to Jim 9 9. Data flows between clients 6 5 Eurecom SIP registrar 5. eurecom registrar forwards INVITE to , which is running keith s SIP client

19 multimedia in the Internet video streaming

20 approaches to streaming HTTP download progressive download pseudostreaming relies on the ability of HTTP clients to seek to positions in the media file by performing byte range requests to the Web server (HTTP 1.1) keyframes are used as reference points, so the accuracy of seek depends on how the video was encoded dedicated server streaming requires streaming protocol for signalling (RTSP, RTMP) HTTP adaptive streaming (HAS)

21 HTTP Adaptive Streaming server: client: divides video file into multiple chunks each chunk stored, encoded at different rates manifest file: provides URLs for different chunks periodically measures serverto-client bandwidth consulting manifest, requests one chunk at a time chooses maximum coding rate sustainable given current bandwidth can choose different coding rates at different points in time (depending on available bandwidth at time) intelligence at client: client determines when to request chunk (so that buffer starvation, or overflow does not occur) what encoding rate to request (higher quality when more bandwidth available)

22 Microsoft Smooth Streaming MP4 container all fragments with the same bitrate are stored in a single MP4 file when a client requests a specific source time segment from the IIS Web server, the server dynamically finds the appropriate Movie Fragment box within the MP4 file chunks are sent as a standalone files (full cacheability downstream possible) RESTful URL:

23 DASH - Dynamic Adaptive Streaming over HTTP 26

24 DASH - Dynamic Adaptive Streaming over HTTP Media Presentation Description Stream segmentation

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