2/22/08IEEE 1733 Face-to-Face Sandy, Utah 1 RTP Overview Suman Sharma [email protected].

2/22/08 IEEE 1733 Face-to-FaceSandy, Utah

1

RTP Overview

Suman Sharma

[email protected]

RTP Stack


2

IPIP

Payload FormatsPayload Formats

RTPRTP

UDPUDP TCPTCP

RTSPRTSP

SDPSDP

RTP: rfc3550 RTSP: rfc2326 SDP: rfc2327 SRTP: rfc3711

RTP/AVP: rfc3551

RTP Header


Payload

RT

P P

ay

loa

d

Architecture for Media Streaming

SENDERSENDER(Streaming(StreamingServer)Server)

SENDERSENDER(Streaming(StreamingServer)Server)

RTSP/SDPRTSP/SDPRTSP/SDPRTSP/SDP

RTP/MPEGRTP/MPEGRTP/MPEGRTP/MPEG

Control PlaneControl Plane

Data PlaneData Plane

ISMAISMARECEIVERRECEIVER

ISMAISMARECEIVERRECEIVER

DeliveryDeliveryDeliveryDelivery


RTP / RTCP Walk-thru

ServerServerServerServer ClientClient ClientClient UDPUDP UDPUDP

RTCPRTCPRTCPRTCP RTCPRTCPRTCPRTCP

RTCPRTCPRTCPRTCP RTCPRTCPRTCPRTCP

RTPRTPRTPRTP RTPRTPRTPRTP

MP4MP4FileFileMP4MP4FileFile

SystemSystemPacketPacketSystemSystemPacketPacket

READINGREADINGREADINGREADING PARSERPARSERPARSERPARSER

DECODERDECODERDECODERDECODER

RESPONSERESPONSERESPONSERESPONSE

PARSERPARSERPARSERPARSER

CLIENTCLIENTCLIENTCLIENTSERVERSERVERSERVERSERVER

PARSERPARSERPARSERPARSER

RESPONSERESPONSERESPONSERESPONSE


Out-of-band Control for QoS ReportingOut-of-band Control for QoS Reporting


Mapping of Media Data

Video AUVideo AUVideo AUVideo AU RTP HeaderRTP HeaderRTP HeaderRTP Header AU dataAU dataAU dataAU data

RTP HeaderRTP HeaderRTP HeaderRTP Header

RTP HeaderRTP HeaderRTP HeaderRTP Header

AU dataAU dataAU dataAU data

AU dataAU dataAU dataAU data

1/n AU1/n AU1/n AU1/n AU

…………

1/n AU1/n AU1/n AU1/n AU

………… …………

AU1AU1 AU1AU1

AU2AU2 AU2AU2

AU3AU3 AU3AU3

AU…AU… AU…AU…

AU1 AU1 HeaderHeaderAU1 AU1 HeaderHeader

RTP RTP HeaderHeaderRTP RTP HeaderHeader


AU… AU… HeaderHeaderAU… AU… HeaderHeader


AU… AU… datadataAU… AU… datadata

AU dataAU dataAU dataAU dataAU dataAU dataAU dataAU dataAU dataAU dataAU dataAU data

AU header sectionAU header sectionAU header sectionAU header section

RTP payloadRTP payloadRTP payloadRTP payload

Mapping of AU into RTP PacketMapping of AU into RTP PacketMapping of AU into RTP PacketMapping of AU into RTP Packet

Mapping of Video AU into multiple RTP PacketsMapping of Video AU into multiple RTP PacketsMapping of Video AU into multiple RTP PacketsMapping of Video AU into multiple RTP Packets

Mapping of Audio AUs into RTP PacketMapping of Audio AUs into RTP PacketMapping of Audio AUs into RTP PacketMapping of Audio AUs into RTP Packet

AU = Access UnitAU = Access UnitHintingHintingHintingHinting

Case 1:Case 1:Case 1:Case 1:

Case 2:Case 2:Case 2:Case 2:


RTCP Packet Structure

• RTCP Packet Types– Sender Report (SR): transmission statistics– Receiver Report (RR): reception statistics– Source Description Item (SDES): CNAME, etc– BYE: end of participation– Application Specific Functions (APP)

• RTCP Compound Packet– Because RTCP packets are small, one UDP packet

may contain several RTCP packets.For example, SR + SDES + APP

• RTCP Packet Types– Sender Report (SR): transmission statistics– Receiver Report (RR): reception statistics– Source Description Item (SDES): CNAME, etc– BYE: end of participation– Application Specific Functions (APP)

• RTCP Compound Packet– Because RTCP packets are small, one UDP packet

may contain several RTCP packets.For example, SR + SDES + APP



RTSP Commands

Required Required Required Required Client->ServerClient->ServerClient->ServerClient->ServerTEARDOWNTEARDOWNTEARDOWNTEARDOWN

Optional Optional Optional Optional Client<->ServerClient<->ServerClient<->ServerClient<->ServerSET_PARAMETERSET_PARAMETERSET_PARAMETERSET_PARAMETER

Required Required Required Required Client->ServerClient->ServerClient->ServerClient->ServerSETUPSETUPSETUPSETUP

Optional Optional Optional Optional Server->ClientServer->ClientServer->ClientServer->ClientREDIRECTREDIRECTREDIRECTREDIRECT

Optional Optional Optional Optional Client->ServerClient->ServerClient->ServerClient->ServerRECORDRECORDRECORDRECORD

Required Required Required Required Client->ServerClient->ServerClient->ServerClient->ServerPLAYPLAYPLAYPLAY

Recommended Recommended Recommended Recommended Client->ServerClient->ServerClient->ServerClient->ServerPAUSEPAUSEPAUSEPAUSE

Required (S->C: optional)Required (S->C: optional)Required (S->C: optional)Required (S->C: optional)Client<->ServerClient<->ServerClient<->ServerClient<->ServerOPTIONSOPTIONSOPTIONSOPTIONS

Optional Optional Optional Optional Client<->ServerClient<->ServerClient<->ServerClient<->ServerGET_PARAMETERGET_PARAMETERGET_PARAMETERGET_PARAMETER

Optional Optional Optional Optional Client<->ServerClient<->ServerClient<->ServerClient<->ServerANNOUNCEANNOUNCEANNOUNCEANNOUNCE

Recommended Recommended Recommended Recommended Client->ServerClient->ServerClient->ServerClient->ServerDESCRIBEDESCRIBEDESCRIBEDESCRIBERequirement Requirement Requirement Requirement Direction Direction Direction Direction Method Method Method Method



SDP

• SDP is relevant to the media announcement• SDP is sent by server in a response to client’s

RTSP:DESCRIBE command request• Example (video specific lines, SDP sample syntax)

– m=video 0 RTP/AVP 97– a=rtpmap: 97 MP4V-ES– a=control: trackID = 6– a=fmtp: 97 profile-level-id=1– config=000001B001000001B5090000010000000120008440FA2

82C2090A21F– Config includes: AU size; AU index/AU index delta: CTS flag;

CTS delta; DTS flag; DT Ｓ delta ．– a=mpeg4-esid:201

• SDP is relevant to the media announcement• SDP is sent by server in a response to client’s

RTSP:DESCRIBE command request• Example (video specific lines, SDP sample syntax)

– m=video 0 RTP/AVP 97– a=rtpmap: 97 MP4V-ES– a=control: trackID = 6– a=fmtp: 97 profile-level-id=1– config=000001B001000001B5090000010000000120008440FA2

82C2090A21F– Config includes: AU size; AU index/AU index delta: CTS flag;

CTS delta; DTS flag; DT Ｓ delta ．– a=mpeg4-esid:201


Initial Object DescriptorInitial Object DescriptorInitial Object DescriptorInitial Object Descriptor


RTSP / SDP Walk-thru

SETUPSETUPSETUPSETUPDESCRIBEDESCRIBEDESCRIBEDESCRIBE SETUPSETUPSETUPSETUP TEARDOWNTEARDOWNTEARDOWNTEARDOWNPAUSEPAUSEPAUSEPAUSEPLAYPLAYPLAYPLAY

OKOK OKOK OKOK OKOK OKOK OKOK OKOK OKOK OKOK OKOK OKOK OKOK

NETWORKNETWORKNETWORKNETWORK

Read SDP Read SDP from MP4 filefrom MP4 fileRead SDP Read SDP from MP4 filefrom MP4 file

Sequential Sequential StagesStagesSequential Sequential StagesStages

Client: parse requests and set responsesClient: parse requests and set responsesClient: parse requests and set responsesClient: parse requests and set responses

Server: parse responses and set requestsServer: parse responses and set requestsServer: parse responses and set requestsServer: parse responses and set requests



Port Assignment (Example)

DarwinDarwinStreamingStreamingServerServer

DarwinDarwinStreamingStreamingServerServer

RTPRTPPort 6980Port 6980


RTCPRTCPPort 6981Port 6981

RTCPRTCPPort 6981Port 6981

RTSPRTSPPort 554 Port 554 or 7070or 7070


HTTPHTTPPort 1220Port 1220

HTTPHTTPPort 1220Port 1220

RTCPRTCPPort 6981Port 6981(Video)(Video)

RTCPRTCPPort 6981Port 6981(Video)(Video)





Remote-Management Remote-Management via Web Browservia Web Browser

Remote-Management Remote-Management via Web Browservia Web Browser

RTCPRTCPPort 6983Port 6983(Audio)(Audio)

RTCPRTCPPort 6983Port 6983(Audio)(Audio)

QuickTimeQuickTimePlayerPlayer

QuickTimeQuickTimePlayerPlayer



2/22/08IEEE 1733 Face-to-Face Sandy, Utah 1 RTP Overview Suman Sharma [email protected].

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Transcript of 2/22/08IEEE 1733 Face-to-Face Sandy, Utah 1 RTP Overview Suman Sharma [email protected].