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Google T 1 alk API - Libjingle

Google T 1 alk API - Libjingle. Speaker ： C hungyi Wang Adviser : Quincy Wu Date : 2006/11/20 1. outline. Google Talk API – Libjingle Compile Example : login Example : call Reference. Google Talk API – Libjingle. Google Talk API – Libjingle Google Talk(1/2). Google Talk

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Google T 1 alk API - Libjingle

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  1. Google T1alk API - Libjingle Speaker：Chungyi WangAdviser : Quincy Wu Date : 2006/11/201

  2. outline • Google Talk API – Libjingle • Compile • Example : login • Example : call • Reference

  3. Google Talk API – Libjingle

  4. Google Talk API – Libjingle Google Talk(1/2) • Google Talk • http://www.google.com/talk/

  5. Google Talk API – Libjingle Google Talk(2/2) • Gmail • http://mail.google.com/mail/

  6. Google Talk API – Libjingle(1/2) • Software : libjingle-0.3.0 • http://code.google.com/apis/talk/index.html • OS : Linux Fedora Core 4

  7. Google Talk API – Libjingle(2/2) • Google Talk Voice and P2P Interoperability Library • 使用XMPP • traverse many types of NATs • establish peer-to-peer connections

  8. Google Talk API – Libjingle Libjingle-XMPP(1/2) • Why? • Google Talk在即時通訊部分使用開放的XMPP協定，鼓勵其他用戶端的使用，用戶連接Google Talk服務時不一定要使用官方客戶端。 • What? • Extensible Messaging and Presence Protocol (XMPP) ，核心定義在 RFC 3920和 RFC 3921 • 是一種開放的XML於real-time溝通的技術

  9. Libjingle Jingle XMPP Google Talk API – Libjingle Libjingle-XMPP(2/2)

  10. Google Talk API - Libjingle 元件(1/3) • talk/base • Low-level portable utility functions • Libjingle 需要的 Socket & Thread • p2p 和 session 都使用此元件 • talk/p2p • The p2p stack, including base p2p functionality and client hooks into XMPP • 溝通，設置還有維持peer-to-peer 連線

  11. Google Talk API - Libjingle 元件(2/3) • talk/session • Phone call signaling and reliable peer-to-peer streams • 了解 Jingle-Audio格式並且可以藉由XMPP和其他Client協商通話 (negotiate) • talk/third_party • Non-Google components required for some functionality • Mediastreamer2 & RTP (from linphone)

  12. Google Talk API - Libjingle 元件(3/3) • XMPP server • talk/xmllite • XML parser • talk/xmpp • XMPP engine

  13. Compile

  14. Compile(1/4) • Linux Command • ./configure • 找尋系統內，程式需要的函式庫以及資源 • make • 編譯程式 • make install • 安裝套件(如果是必須安裝的套件)

  15. Compile(2/4) • ortp-0.7.1 • http://download.savannah.nongnu.org/releases/linphone/ortp/sources/ortp-0.7.1.tar.gz • ./configure之後，修改Makefile的prefix=/usr • make; make install • alsa-lib-1.0.9rc4(ALSA-lib:Advanced Linux Sound Architecture) • http://www.alsa-project.org/alsa/ftp/driver/alsa-driver-0.5.2.tar.gz • ./configure & make install • 如果無法安裝可以考慮安裝 rpm 檔案 • http://www.alsa-project.org/alsa/ftp/lib/stable/alsa-lib-1.0.9rc4.tar.bz2 • ./configure & make install

  16. Compile(3/4) • Libjingle-0.3.0 • ./configure • 完成之後會看到：libjingle 0.3.0Supported Codecs:Speex : noiLBC : noMULAW : yes • make

  17. Compile(4/4) • talk/examples/ • login • 簡單的登入程式範例 • login_main.cc • call • 登入，搜尋線上好友，建立通話，結束通話 • call_main.cc

  18. Example : login

  19. Example : login #include …(1/3) • talk/examples/login/login_main.cc • #include “talk/base/thread.h” • 處理使用者指令，並且設定相對應的訊息(Message)到訊息佇列(MessageQueue)內執行 • 定義類別thread • void Loop( int cms ) • cms 定義迴圈監聽的秒數

  20. Example : login #include …(2/3) • #include “talk/xmpp/xmppclientsettings.h” • 儲存設定的資料；設定項目好比 user，host，server，use_tls (TLS)，auth_cookie or password • 定義類別 thread • set_user(const std::string & user) • set_host(const std::string & host) • set_server(const cricket:SocketAddress &server) • set_auth_cookie(const std:string & auth_cookie) • set_password(const XmppPassword & pass)

  21. Example : login #include …(3/3) • #include “talk/examples/login/xmppthread.h” • 定義指令輸入所需的XmppThread，其功能就是類別thread的工作(Loop)，另外再加上Login( xcs )的函式 • 指定Loop監聽伺服器(talk.google.com)的工作。 • 定義類別 XmppThread • void Loop(int cms) • Thread::Loop(cms) • void Login(const buzz::XmppClientSettings &xcs)

  22. Example : login Flowchart(1/2) • 使用者輸入 帳號，認證碼 • scanf(“%s”, username) • scanf(“%s”, auth_cookie) • 使用者必須登入GMail，並且拷貝瀏覽器上auth之後的字串 • 每次的auth都不相同，並且GMail登出之後XmppThread會因為中斷連線而發生 程式記憶體區段錯誤 • 啟動 XmppThread • XmppThread threadthread.Start( );

  23. Example : login Flowchart(2/2) • 設定 XmppClientSettings • buzz:: XmppClientSettings xcsxcs.set_user(username)xcs.set_host(“gmail.com”)xcs.set_use_tls(false)xcs.set_user(auth_cookie)xcs.set_user(cricket::SocketAddress(“talk.google.com”, 52222)) • 進行登入的動作 • thread.Login(xcs)

  24. Example : login Demo • 示範：talk/examples/login/login_main.cc

  25. Example : login Problems • Auth_Cookie? • 必須登入GMail才能取得auth_cookie • 每次的auth碼都不相同，如果錯誤會直接產生 程式記憶體區段錯誤，由迴圈跳出 • 無法使用password形式 • 會產生 程式記憶體區段錯誤 • 登入狀態? • 由於已經使用瀏覽器登入GMail，所以無法確認登入成功與否 • 但是還是一個最簡單的登入示範範例

  26. Example : call

  27. Example : call #include …(1/4) • talk/examples/login/call_main.cc • 擁有3個Thread • XMPP Client • Input • PhoneSessionClient • #include "talk/base/physicalsocketserver.h“ • cricket::PhysicalSocketServer • 三個Thread都會使用到

  28. Example : call #include …(2/4) • #include "talk/base/ssladapter.h“ • InitializeSSL( ); • Libjingle 啟動 SSL 必須執行的 Initialize • #include "talk/xmpp/xmppclientsettings.h“ • 儲存設定的資訊 • #include "talk/examples/login/xmppthread.h“ • XMPP Client Thread

  29. Example : call #include …(3/4) • #include "talk/examples/login/xmppauth.h“ • 認證：登入以及離線 • XmppPump pump • DoLogin( … ) • DoDisconnect( )

  30. Example : call #include …(4/4) • #include "talk/examples/call/callclient.h“ • 處理使用者的指令

  31. Example : call Flowchart(1/3) • 使用者輸入 帳號，認證碼 當輸入密碼時必須SetConsoleEcho(false) • 填滿XmppClientSetting的資料 • Username，host，pass，server • 建立使用者指令處理執行緒 (T1) • CallClient

  32. Example : call Flowchart(2/3) • 主迴圈建立 • 建立主要執行緒(T2)，並且將處理實體Socket的物件傳入 • cricket::PhysicalSocketServer ss;…cricket::Thread main_thread(&ss); • 建立處理使用者輸入執行緒(T3) • Console *console = new Console(&main_thread, client); • client->SetConsole(console); //設定CallClient的Consolr來源 • cricket::Thread *console_thread = new cricket::Thread(&ss); • console_thread->Start(); • console_thread->Post(console, MSG_START);

  33. Example : call Flowchart(3/3) • 執行登入的動作 • pump.DoLogin(xcs, new XmppSocket(true), 0); • 開始主執行緒的迴圈 • main_thread.Loop();

  34. Example : call Demo • 示範：talk/examples/login/call_main.cc

  35. Example : login Problems • 如果要進行修改，好比說GUI? • 最簡單可以下手的部分在 • CallClient.cc

  36. Reference

  37. Reference • Google Talk • http://www.google.com/talk/ • Gmail • http://mail.google.com/mail/ • libjingle-0.3.0 • http://code.google.com/apis/talk/index.html • XMPP • RFC 3920 • RFC 3921 • Jingle • http://www.xmpp.org/extensions/xep-0166.html • This document defines a framework for initiating and managing peer-to-peer sessions (e.g., voice and video exchanges) between Jabber/XMPP clients in a way that is interoperable with existing Internet standards • http://www.xmpp.org/extensions/xep-0167.html • This document defines a content description format for Jingle audio sessions

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