1 / 52

Porting VoIP Applications to DCCP

Porting VoIP Applications to DCCP. Speaker: Jia-Yu Wang Adviser: Quincy Wu Date:2008/06/05. Outline. Introduction DCCP Connection Linphone System components oRTP Mediastream2 Install Linphone Linphone original Function call Porting Linphone to DCCP Implementing DCCP Function call

rarpin
Download Presentation

Porting VoIP Applications to DCCP

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Porting VoIP Applications to DCCP Speaker: Jia-Yu Wang Adviser: Quincy Wu Date:2008/06/05

  2. Outline • Introduction • DCCP Connection • Linphone • System components • oRTP • Mediastream2 • Install Linphone • Linphone original Function call • Porting Linphone to DCCP • Implementing DCCP Function call • Implementation • Conclusions • Future work • Reference

  3. Introduction(1/3) • Datagram Congestion Control Protocol (RFC 4340)

  4. Introduction(2/3) • Unreliable • No re-transmissions • Reliable handshakes for connection setup and teardown • Has modular congestion control • Can detect congestion and take avoiding action • Different algorithms can be selected – CCID • TCP-like (CCID2) • TCP Friendly Rate Control (CCID3) • Packet sequence numbers

  5. Introduction(3/3) • DCCP Application • Video streaming • Audio streaming • IP Telephony

  6. DCCP Connection

  7. Linphone(1/2) • Linphone is an internet phone • Linphone complies to the SIP protocol • Linphone is free-software (or open-source), you can download and redistribute it freely

  8. Linphone(2/2) • SIP proxy support: registrar, proxies, with digest authentication • DTMF (telephone tones) support using SIP INFO or RFC2833 • Supports IPv6 • STUN support for traversal of UDP NATs (=firewall) • Text instant messaging and presence (using the SIMPLE standart)

  9. System components(1/2) • Audio codecs:

  10. System components(2/2)

  11. oRTP • Written in C, works under Linux (and probably any Unix) and Windows. • Implement the RFC3550 (RTP) with a easy to use API with high and low level access. • Supports part of RFC2833 for telephone events over RTP. From : http://www.linphone.org/index.php/eng/code_review/ortp

  12. mediastream2 • Send and receive RTP packets • Encode and decode the following formats: speex, G711, GSM, H263, theora. • Read and write from/to a wav file • Echo cancelation, using the extraordinary echo canceler algorithm from the speex library From : http://www.linphone.org/index.php/eng/code_review/mediastreamer2

  13. Install Linphone(1/2) • perl-XML-Parser • perl-XML-Parser-2.34-6.1.2.2.1.i386.rpm • speex-devel • speex-devel-1.2-0.2.beta1.i386.rpm • readline-devel • readline-devel-5.2-4.fc7.i386.rpm • libosip2 • libosip2-2.2.2.tar.gz • ./configure • make • make install

  14. Install Linphone(2/2) • linphone-1.7.1 • ./configure –disable-video • make • make install • # linphone • http://ms11.voip.edu.tw/~jiayu/research/linphone-1.7.1_full_fc7_i386.tar.gz

  15. Linphone original Function call

  16. Porting Linphone to DCCP • Create 2 RTP Session • DCCP connection is uni-directional • Connect-Oriented • Receiver socket need to use Blocking for accept • Receiver socket need to accept the establishment of waiting for sender socket connect • Socket • Create socket need using DCCP protocol

  17. Implementing DCCPFunction call_1

  18. Implementing DCCPFunction call_2

  19. Implementing DCCPFunction call_3

  20. Implementation

  21. Conclusions • Implementing RTP over DCCP • 2 RTP session to establishment the use of call • DCCP connection is uni-directional • Porting Linphone to DCCP

  22. Future work • UDP conversion and DCCP • NAT handling • Defined other CCID (CCID4 …)

  23. Reference • Datagram Congestion Control Protocol (RFC 4340) • CCID2-TCP-like Congestion Control (RFC 4341) • CCID3-TCP-Friendly Rate Control (TFRC) (RFC4342) • RTP and the Datagram Congestion Control Protocol (DCCP) • draft-ietf-dccp-rtp-07.txt • Linphne • http://www.linphone.org/index.php/eng

  24. Linphone original 1 • oRTP/rtpsession_inet.c • static ortp_socket_t create_and_bind(const char *addr, int port, int *sock_family) • 建立socket並bind • static ortp_socket_t create_and_bind_random(const char *localip, int *sock_family, int *port) • 建立random port number的socket

  25. Linphone original 2 • oRTP/rtpsession_inet.c • Int rtp_session_set_local_addr (RtpSession * session, const char * addr, int port) • 設定local address • 檢查是否有輸入port值 if (port>0){ create_and_bind(addr,port,&sockfamily); }else{ create_and_bind_random(addr,&sockfamily,&port); }

  26. Linphone original 3 • oRTP/rtpsession_inet.c • int rtp_session_set_remote_addr (RtpSession * session, const char * addr, int port) • 設定遠端的address • 檢查socket是否未建立 if (session->rtp.socket == -1){ if (res0->ai_addr->sa_family==AF_INET6){ rtp_session_set_local_addr (session, "::", -1); } else { rtp_session_set_local_addr (session, "0.0.0.0", -1); } }

  27. Linphone original 4 • oRTP/rtpsession_inet.c • int rtp_session_rtp_recv (RtpSession * session, uint32_t user_ts) • 接收rtp封包

  28. Linphone original 5 • oRTP/rtpsession_inet.c • rtp_session_rtp_send (RtpSession * session, mblk_t * m) • 傳送rtp封包

  29. Linphone original 6 • oRTP/rtpsession.c • rtp_session_recvm_with_ts(RtpSession * session, uint32_t user_ts) • 使用rtp_session_rtp_recv()接收rtp封包，加入timestamp。

  30. Linphone original 7 • oRTP/rtpsession.c • int rtp_session_sendm_with_ts (RtpSession * session, mblk_t *mp, uint32_t timestamp) • 使用rtp_session_rtp_send()傳送rtp封包，加入timestamp。

  31. Linphone original 8 • mediastream2/msrtp.c • static void receiver_preprocess(MSFilter * f) • 設定receive端的payload

  32. Linphone original 9 • mediastream2/msrtp.c • static void receiver_process(MSFilter * f) • 進行接收rtp封包的process • rtp_session_recvm_with_ts()

  33. Linphone original 10 • mediastream2/msrtp.c • static void sender_process(MSFilter * f) • 進行傳送rtp封包的process • rtp_session_sendm_with_ts()

  34. Linphone original 11 • mediastream2/audiostream.c • int audio_stream_start_full(AudioStream *stream, RtpProfile *profile, const char *remip,int remport, int payload,int jitt_comp, const char *infile, const char *outfile, MSSndCard *playcard, MSSndCard *captcard, bool_t use_ec) • 建立session的設定 • 產生soundread執行緒，進行傳送rtp封包 • ms_ticker_attach(stream->ticker,stream->soundread); • 產生rtprecv執行緒，進行rtp封包接收 • ms_ticker_attach(stream->ticker,stream->rtprecv);

  35. Linphone original 12 • mediastream2/audiostream.c • AudioStream *audio_stream_new(int locport, bool_t ipv6) • 產生audio stream後，建立rtp session • create_duplex_rtpsession();

  36. Linphone original 13 • mediastream2/audiostream.c • RtpSession * create_duplex_rtpsession( int locport, bool_t ipv6) • 建立session • rtp_session_new(RTP_SESSION_SENDRECV); • 建立socket • rtp_session_set_local_addr(rtpr,ipv6 ? "::" : "0.0.0.0",locport);

  37. Linphone original 14 • mediastream2/audiostream.c • int audio_stream_start_now(AudioStream *stream, RtpProfile * prof, const char *remip, int remport, int payload_type, int jitt_comp, MSSndCard *playcard, MSSndCard *captcard, bool_t use_ec) • 進行stream傳輸 • audio_stream_start_full();

  38. Implementing DCCP_1 1 • mediastream2/audiostream.c • AudioStream *audio_stream_new(int locport, bool_t ipv6) • 產生一個audio stream後，建立二個rtp session • create_duplex_rtpsession_recv(); • create_duplex_rtpsession_send();

  39. Implementing DCCP_1 2 • mediastream2/audiostream.c • RtpSession * create_duplex_rtpsession_recv( int locport, bool_t ipv6) • 建立第一個session，receive端用，並建立socket等待accept • ortp_init(); • ortp_scheduler_init(); • rtp_session_new(RTP_SESSION_SENDRECV); • rtp_session_set_scheduling_mode(rtpr,1); • rtp_session_set_blocking_mode(rtpr,1); • rtp_session_set_connected_mode(rtpr,TRUE); • rtp_session_set_local_addr(rtpr,ipv6 ? “::” : “0.0.0.0”,locport);

  40. Implementing DCCP_1 3 • mediastream2/audiostream.c • RtpSession * create_duplex_rtpsession_send( int locport, bool_t ipv6) • 建立第二個session，send端用 • ortp_init(); • ortp_scheduler_init(); • rtp_session_new(RTP_SESSION_SENDRECV); • rtp_session_set_scheduling_mode(rtpr,1); • rtp_session_set_blocking_mode(rtpr,1); • rtp_session_set_connected_mode(rtpr,TRUE);

  41. Implementing DCCP_1 4 • oRTP/rtpsession_inet.c • static ortp_socket_t create_and_bind_recv(const char *addr, int port, int *sock_family) • 建立socket並bind及listen (receive端) • 建立DCCP的預設使用值 SOCK_DCCP=6; SOL_DCCP=269; DCCP_SOCKOPT_PACKET_SIZE=1; DCCP_SOCKOPT_SERVICE=2; IPPROTO_DCCP=33; • socket(ai_family, SOCK_DCCP, IPPROTO_DCCP); • setsockopt(sock,SOL_DCCP,DCCP_SOCKOPT_PACKET_SIZE, (char*)&pkt_size,sizeof(pkt_size)); • setsockopt(sock,SOL_DCCP,DCCP_SOCKOPT_SERVICE,(char*)&pkt_size,sizeof(pkt_size)); • set_non_blocking_socket (sock); //將socket設定為non_blocking，由於DCCP為Connect-Oriented 必須使用accept()，所以不能non_blocking。

  42. Implementing DCCP_2 1 • mediastream2/audiostream.c • int audio_stream_start_now(AudioStream *stream, RtpProfile * prof, const char *remip, int remport, int payload_type, int jitt_comp, MSSndCard *playcard, MSSndCard *captcard, bool_t use_ec) • 進行stream傳輸，先進行send，再進行recv • audio_stream_start_full_send(); • audio_stream_start_full_recv();

  43. Implementing DCCP_2 2 • mediastream2/audiostream.c • int audio_stream_start_full_recv(AudioStream *stream, RtpProfile *profile, const char *remip,int remport, int payload,int jitt_comp, const char *infile, const char *outfile, MSSndCard *playcard, MSSndCard *captcard, bool_t use_ec) • 建立第一個session的設定(receive端) • 產生rtprecv執行緒，進行rtp封包接收 • ms_ticker_attach(stream->ticker,stream->rtprecv);

  44. Implementing DCCP_2 3 • mediastream2/audiostream.c • int audio_stream_start_full_send(AudioStream *stream, RtpProfile *profile, const char *remip,int remport, int payload,int jitt_comp, const char *infile, const char *outfile, MSSndCard *playcard, MSSndCard *captcard, bool_t use_ec) • 建立第二個session的設定(send端) • 產生soundread執行緒，進行傳送rtp封包 • ms_ticker_attach(stream->ticker,stream->soundread);

  45. Implementing DCCP_2 4 • oRTP/rtpsession_inet.c • static ortp_socket_t create_and_bind_random(const char *localip, int *sock_family, int *port) • 呼叫使用沒有listen的socket函式，且port number為random (send端) • create_and_bind_send();

  46. Implementing DCCP_2 5 • mediastream2/msrtp.c • static void sender_preprocess(MSFilter * f) • 建立connect • connect(rtp.socket, (struct sockaddr*)&rtp.rem_addr, rtp.rem_addrlen)

  47. Implementing DCCP_2 6 • mediastream2/msrtp.c • static void receiver_preprocess(MSFilter * f) • 設定receive端的payload，並進行accept呼叫 • d->connfd=rtp_session_rtp_recv_accept();

  48. Implementing DCCP_2 7 • oRTP/rtpsession_inet.c • int rtp_session_rtp_recv_accept (RtpSession * session) • 建立accept (receive端） • accept(sockfd,(struct sockaddr *) &remaddr,&addrlen)

  49. Implementing DCCP_2 8 • oRTP/rtpsession_inet.c • static ortp_socket_t create_and_bind_send(const char *addr, int port, int *sock_family) • 建立socket並bind(send端) • 建立DCCP的預設使用值 SOCK_DCCP=6; SOL_DCCP=269; DCCP_SOCKOPT_PACKET_SIZE=1; DCCP_SOCKOPT_SERVICE=2; IPPROTO_DCCP=33; • socket(ai_family, SOCK_DCCP, IPPROTO_DCCP); • setsockopt(sock,SOL_DCCP,DCCP_SOCKOPT_PACKET_SIZE, (char*)&pkt_size,sizeof(pkt_size)); • setsockopt(sock,SOL_DCCP,DCCP_SOCKOPT_SERVICE,(char*)&pkt_size,sizeof(pkt_size)); • set_non_blocking_socket (sock); //將socket設定為non_blocking，由於DCCP為Connect-Oriented 必須使用accept()，所以不能non_blocking。

  50. Implementing DCCP_3 1 • mediastream2/msrtp.c • static void receiver_process(MSFilter * f) • 進行接收rtp封包的process，修改加入accept參數(int connfd)。 • rtp_session_recvm_with_ts(session, timestamp,connfd)

More Related