PJSIP简介配置和PJLIB基础库的使用

PJSIP的实现是为了能在嵌入式设备上高效实现SIP/VOIP. 
 

1.PJSIP库的主要特征:

1).极具移植性.(Extremely portable) 
   当前可支持平台包括: 
   * Win32/x86 (Win95/98/ME, NT/2000/XP/2003, mingw). 
   * arm, WinCE and Windows Mobile. 
   * Linux/x86, (user mode and as kernel module(!)). 
   * Linux/alpha 
   * Solaris/ultra. 
   * MacOS X/powerpc 
   * RTEMS (x86 and powerpc). 
   * Symbian OS

2).非常小的足印.(Very small footprint) 
   官方宣称编译后的库<150Kb,我在PC上编译后加上strip后大概173Kb,这对于嵌入 
   式设备,是个好消息

3).高性能.(High performance) 
   这点我们后面可以看看是否如作者宣称的

 

2. PJSIP的组成.

其实说是PJSIP不是特别贴切,这个库实际上是几个部分组成的. 
1).PJSIP - Open Source SIP Stack[开源的SIP协议栈] 
2).PJMEDIA - Open Source Media Stack[开源的媒体栈] 
3).PJNATH - Open Source NAT Traversal Helper Library[开源的NAT-T****库] 
4).PJLIB-UTIL - Auxiliary Library[****工具库] 
5).PJLIB - Ultra Portable Base Framework Library[基础框架库] 
    PJLIB-UTIL****工具库：加解密MD5和CRC32的算法 
    PJNATH开源的NAT库包含ICE打洞 
    PJSUA-LIB库：最顶层的SIP库支持VOIP 
    PJMEDIA库：最顶层的支持视频的库

 

3. PJLIB基础框架库提供的功能：

1).内存的处理、数据的存储 
   .数据结构的（hash表、link表、二叉树、等） 
   .caching和pool；缓冲池和内存池 
2).OS抽象 
   .线程、互斥、临界区、锁对象、事件对象 
   .定时器 
   .pj_str_t字符串 
3).操作系统级别的函数抽象 
   .socket的抽象(tcp/udp) 
   .文件的读写 
4).使用前的初始化，使用后的清理

 

4.PJSIP的安装和配置：

1.安装和编辑pjsip库： 
A.将pjproject-1.5.zip和DirectX-Lib.rar解压到当前目录的pjlib路径下； 
B.查看pjlib\pjproject-1.5\pjlib\include\pj下面是否有config_site.h，如果没有建一个空文件 
C.将DirectX的x86的lib库拷贝到C:\Program Files\Microsoft Visual Studio 8\VC\PlatformSDK\Lib 
D.在环境变量中设置DXSDK_DIR=direx中的include目录 
E.首先编译pjlib\pjproject-1.5\pjproject-vs8.sln [win32] 
F.然后打开工程开始编译

2.脱离pjsip环境的工程的配置 
需要头文件的可以加入 
$(SolutionDir)pjlib\pjproject-1.5\pjlib\include 
$(SolutionDir)pjlib\pjproject-1.5\pjlib-util\include 
$(SolutionDir)pjlib\pjproject-1.5\pjnath\include 
$(SolutionDir)pjlib\pjproject-1.5\pjsip\include 
$(SolutionDir)pjlib\pjproject-1.5\pjmedia\include

如果需要lib库文件的加入 
$(SolutionDir)pjlib\pjproject-1.5\pjlib\lib 
$(SolutionDir)pjlib\pjproject-1.5\pjlib-util\lib 
$(SolutionDir)pjlib\pjproject-1.5\pjnath\lib 
$(SolutionDir)pjlib\pjproject-1.5\pjsip\lib 
$(SolutionDir)pjlib\pjproject-1.5\pjmedia\lib 
$(SolutionDir)pjlib\pjproject-1.5\lib

我的程序所依赖PJLIB的库有： 
pjlib-i386-Win32-vc8-Debug.lib 
pjlib-util-i386-Win32-vc8-Debug.lib 
pjnath-i386-Win32-vc8-Debug.lib 
pjsip -core-i386-Win32-vc8-Debug.lib 
pjsip-simple-i386-Win32-vc8-Debug.lib 
pjsip-ua-i386-Win32-vc8-Debug.lib 
pjsua -lib-i386-Win32-vc8-Debug.lib 
pjmedia -audiodev-i386-Win32-vc8-Debug.lib 
pjmedia-codec-i386-Win32-vc8-Debug.lib 
pjmedia-i386-Win32-vc8-Debug.lib 
libpjproject-i386-Win32-vc8-Debug.lib

1.使用前的初始化和使用后的清理

PJSIP库里面封装了很多线程内存池；而且很多对象都是基于内存池创建的，所以几乎所以的库都需要初始化或创建 
下面是pjlib,pjlib-util,pjnath,pjsua-lib库的初始化和关闭

显示行号 复制代码  这是一段程序代码。

1.  pj_status_t status;

2. status = pj_init();         //初始化pjlib库返回PJ_SUCCESS表示成功

3. status = pjlib_util_init(); //初始化pjlib-util库

4. status = pjnath_init();     //初始化pjnath库

5. status = pjsua_create();    //初始化pjsua-lib库;(里面初始化了pjlib,pjlib-util,pjnath) 

6.  

7. pj_shutdown();    //pjlib停止

8. pjsua_destroy();  //pjsua-lib库的清理 

 

2.缓冲池和内存池(caching,pool)

pjsip的内存池的使用规则： 
每个内存池都是基于内存池工厂创建的；pjsip有一个默认的内存池工厂pj_caching_pool； 
我喜欢把它叫做缓冲池；将来清理内存池的时候，可以关闭内存池也可直接关闭缓冲池； 
    pj_caching_pool cp; 
    pj_caching_pool_init(&cp, NULL, 1024*1024 );       //缓冲池 
    pj_caching_pool_destroy(&cp); //释放工厂

    pj_pool_t pool = pj_pool_create(&cp.factory, "name", 1024, 1024, NULL); //创建内存池 
    pj_pool_release(&pool); //释放内存池到工厂中，直接释放工厂可省略这一步 
    void* p = pj_pool_alloc(pool, size); //在内存中开辟一个空间
    注：适当的初始化大小；内存池只能增加不能减小 
    由于pjlib很多内部对象都用内存池，所以在对象释放之前不能释放内存池。

使用缓冲池和内存池

1.  //系统初始化的时候调用

2. void create()
   

3. {
   

4. //初始化pjlib库返回PJ_SUCCESS表示成功
   

5. pj_status_t status = pj_init(); 
   

6.  

7. pj_caching_pool_init(&this->m_caching, NULL, 0);
   

8. this->m_pool = pj_pool_create(&this->m_caching.factory, "", 256, 256, NULL);
   

9.  

10.  //初始化mutex
    

11. pj_mutex_create(this->m_pool, "", PJ_MUTEX_SIMPLE, &this->m_pool_mutex);
    

12.  

13.  //创建一个lock给定时器用
    

14. pj_lock_create_simple_mutex(this->m_pool, "timer_lock", &this->timer_heap_lock);
    

15.  

16.  //在内存池上开辟一块空间
    

17. char *pmem = (char*)pj_pool_alloc(this->m_pool, 1024); 
    

18.  

19.  //创建一个定时器堆
    

20. pj_timer_heap_create(this->m_pool, MAX_TIMER_COUTN, &this->timer_heap);
    

21.  

22.  //给定时器加锁; 将来自动删除该锁，无需手工删除
    

23. pj_timer_heap_set_lock(this->timer_heap, this->timer_heap_lock, true);
    

24.  }
    

25.  

26.  //系统退出的时候调用
    

27. void destroy()
    

28.  {
    

29.  //删除mutex
    

30. pj_mutex_destroy(this->m_pool_mutex);
    

31.  

32.  //删除定时器的堆
    

33. pj_timer_heap_destroy(this->timer_heap);
    

34.  

35.  //清理内存池，这一步也可以删略；让caching_pool来清理
    

36. pj_pool_destroy_int(this->m_pool); 
    

37.  

38.  //清理缓冲池；所有在缓冲池建立的内存池都会被清理掉
    

39. pj_caching_pool_destroy(&this->m_caching);
    

40.  

41.  //pjlib停止
    

42. pj_shutdown();
    

43.  }
    

 3.线程的介绍，及其线程的封装和使用

1.外部函数或线程使用到pjsip的时候，必须注册线程 
 

隐藏行号 复制代码  注册线程

1.  pj_thread_desc desc;

2. pj_bzero(desc, sizeof(desc));
   

3. pj_thread_t *thread_;
   

4. if (pj_thread_register("", desc, &thread_) != PJ_SUCCESS) 
   

5.     return 0; /* 失败*/ 
   

2.线程的创建和使用 

pj_thread_create(pool*,"", function, *arg, stack_size, flag, ** pj_thread_t) // 创建一个线程 
pj_thread_destroy(thread);  // 注销一个线程 
pj_thread_resume(thread);  // 线程继续 
pj_thread_sleep(1500);       // 当前的线程暂停 1500 毫秒 
pj_thread_join(thrad);        // 等待线程结束 
pj_thread_proc 函数原型是： int  thread_func( void * argv); 


3.对pjlib的thread的线程的封装

1:  class CSipThread

   2: {

   3:     //1.实现一个int ()(void*)的函数，且在结束的地方设置m_thread_t=NULL

   4:     pj_thread_t *m_thread_t;

   5: protected:

   6:  

   7:     /* int (pj_thread_proc)(void*);

   8:     * 线程函数；子类需要使用static函数来实现

   9:     * 子类函数中在结束的时候：必须将m_thread_t = NULL;

  10:     */

  11:     pj_thread_proc *m_thread_function;

  12:  

  13:     /* 这个是实现函数；

  14:     * 子类需要实现一个run()的函数；在run函数中调用run_父类的函数

  15:     */

  16:     virtual void run_(pj_pool_t *pool, pj_thread_proc *function);

  17: public:

  18:     CSipThread();

  19:     virtual ~CSipThread();

  20:     virtual bool thread_running();

  21:  

  22:     //等待线程结束，自动释放资源，且会将m_thread_t=NULL

  23:     virtual void thread_join();

  24:  

  25:     //在线程自己退出的时候，没有需要手工释放资源，和设置m_thread_t=NULL

  26:     virtual void thread_destroy();

  27: };

  28: CSipThread::CSipThread()

  29: {

  30:     this->m_thread_t = NULL;

  31: }

  32: CSipThread::~CSipThread()

  33: {

  34:  

  35: }

  36: void CSipThread::run_(pj_pool_t *pool, pj_thread_proc *function)

  37: {

  38:     if ( this->thread_running())

  39:         return;

  40:     pj_status_t status = pj_thread_create(pool, "", function, this, 

  41:         PJ_THREAD_DEFAULT_STACK_SIZE, NULL, &this->m_thread_t);

  42:     if (status != PJ_SUCCESS)

  43:     {

  44:         CFunctions::write_log(LM_ERROR, "Can't create timer thread. [result=%d]..\n", status);

  45:     }

  46: }

  47: bool CSipThread::thread_running()

  48: {

  49:     if (this->m_thread_t == NULL)

  50:         return false;

  51:     else

  52:         return true;

  53: }

  54:  

  55: void CSipThread::thread_join()

  56: {

  57:     if (this->m_thread_t == NULL)

  58:         return;

  59:  

  60:     // 等待线程结束

  61:     pj_thread_join(this->m_thread_t);

  62: }

  63:  

  64: void CSipThread::thread_destroy()

  65: {

  66:     pj_thread_destroy(this->m_thread_t);

  67:     this->m_thread_t = NULL;

  68: }

 

4.使用封装起来的thread线程对象

 

1:  /* 使用封装后的线程注意事项

   2: * 1. 必须定义一个static的静态函数

   3: * 2. 在静态函数结束的时候必须调用thread_destroy();

   4: */

   5: class CSendThread : public CSipThread

   6: {

   7:     //线程函数；在函数退出的时候必须调用thread_destroy();

   8:     static int thread_func(void * argv);

   9: public:

  10:     CSendThread(void);

  11:     virtual ~CSendThread(void);

  12:  

  13:     //再次封装了run_函数

  14:     void run();

  15: }

  16:  

  17: void CSendThread::run()

  18: {

  19:     if ( this->thread_running())

  20:         return;

  21:  

  22:     SIP_GUARD(CInterFace::instance()->m_pool_mutex, obj);

  23:  

  24:     //调用父类的run_函数进行创建函数，开始运行；注意如果线程已经存在，那么直接返回

  25:     //不会再创建一个线程

  26:     this->run_(CInterFace::instance()->m_pool, &CSendThread::thread_func);

  27: }

  28:  

  29: int CSendThread::thread_func(void * argv)

  30: {

  31:     // 线程函数的参数默认是当前对象，等同于this指针

  32:     CSendThread *this_thread = (CSendThread*)argv;

  33:  

  34: thread_end:

  35:     // 在线程结束的时候，一定要调用thread_destroy();来删除线程

  36:     this_thread->thread_destroy();

  37:     return 0;

  38: }

 

 

4.互斥和锁,及其封装(mutex)

pj_mutex_create( this->m_pool, "", PJ_MUTEX_SIMPLE, &this->m_pool_mutex); // 创建一个锁指针 
pj_mutex_destroy( this->m_pool_mutex); // 删除锁指针 
pj_mutex_lock(m_mutex);    // 加锁 
pj_mutex_unlock(m_mutex);  // 解锁

1:  /* 封装了mutex的使用方法

   2: * 在创建对象时加锁、删除对象时解锁

   3: */

   4: class Sip_Lock

   5: {

   6:     pj_mutex_t *m_mutex;

   7: public:

   8:     Sip_Lock(pj_mutex_t *mutex)

   9:     {

  10:         this->m_mutex = mutex;

  11:         pj_mutex_lock(m_mutex);

  12:     }

  13:     virtual ~Sip_Lock()

  14:     {

  15:         pj_mutex_unlock(m_mutex);

  16:         this->m_mutex = NULL;

  17:     }

  18: };

  19:  

  20: /* 封装了sip_lock的使用，直接使用宏定义进行互斥 */

  21: #define SIP_GUARD(MUTEX, OBJ) Sip_Lock OBJ(MUTEX);

 

 

 

5.定时器(heap,callback,thread)

// 创建定时器堆，设置定时器堆pool大小 
pj_timer_heap_create( this->m_pool, MAX_TIMER_COUTN, & this->timer_heap); 
pj_timer_heap_set_max_timed_out_per_poll( this->timer_heap, 20); 
 

// 对定时器加锁是lcok类型 
pj_timer_heap_set_lock( this->timer_heap,  this->timer_heap_lock,  true); 
 

// 启动定时器轮询的线程 
this-> run_( this->m_pool, & CInterFace::timer_thread_fun); 
 

// 设置一个定时器 
pj_timer_heap_schedule (this->timer_heap, entry, delay); 

// 取消一个定时器 
pj_timer_heap_cancel (this->timer_heap, entry); 

// 定时器的入口点定义 
struct pj_timer_entry 
{ 
     void *user_data;  //  定时器的用户数据；C++通常用类对象；C通常用struct 
     int id;  //  绝对的ID号；用来区分当user_data和cb都相同的情况 
     pj_timer_heap_callback *cb;  //  定时器中的回调函数 
}; 
 

  // 定时器回调函数的原型 

void  timer_callback (pj_timer_heap_t *timer_heap,struct pj_timer_entry *entry);

 

一个定时器的使用例子： 
1. 创建一个定时器、创建一个线程 
2. 创建一个定时器入口entry 
3. 创建一个定时器的回调函数，在回调函数中必须重新将entry加入堆中

1:  //创建定时器堆，设置定时器堆pool大小; 加锁；

   2: pj_timer_heap_create(this->m_pool, MAX_TIMER_COUTN, &this->timer_heap);

   3: pj_timer_heap_set_max_timed_out_per_poll(this->timer_heap, 20);

   4: pj_timer_heap_set_lock(this->timer_heap, this->timer_heap_lock, true);

   5:  

   6: //启动定时器轮询的线程

   7: this->run_(this->m_pool, &CInterFace::timer_thread_fun);

   8:  

   9:  

  10: //定时器的线程函数

  11: int CInterFace::timer_thread_fun(void* argv)

  12: {

  13:     CInterFace *this_thread = (CInterFace*)argv;

  14:     int rc;

  15:     while ( !CInterFace::instance()->application_exit() )

  16:     {

  17:         pj_thread_sleep(1);

  18:  

  19: #if defined(PJ_SYMBIAN) && PJ_SYMBIAN!=0

  20:         /* On Symbian, we must use OS poll (Active Scheduler poll) since 

  21:         * timer is implemented using Active Object.

  22:         */

  23:         rc = 0;

  24:         while (pj_symbianos_poll(-1, 0))

  25:             ++rc;

  26: #else

  27:         PJ_USE_EXCEPTION;

  28:         PJ_TRY

  29:         {

  30:             rc = pj_timer_heap_poll(CInterFace::instance()->timer_heap, NULL);

  31:         }

  32:         PJ_CATCH_ANY

  33:         {

  34:  

  35:         }

  36:         PJ_END;

  37: #endif

  38:     }

  39:  

  40:     // 定时器轮询的线程退出；必须手工删除pj_thread_t指针，因为它使用了内存池！

  41:     CFunctions::write_log(LM_DEBUG, "pj_timer_heap_pool, ending.\n");

  42:     this_thread->thread_destroy();

  43:     return 0; 

  44: }

  45:  

  46:  

  47: //启动一个定时器：也就是将一个entry添加到堆上面

  48: void CInterFace::start_timer(pj_timer_entry* entry, pj_time_val *delay)

  49: {

  50:     if ( !this->thread_running())

  51:         return;

  52:  

  53:     SIP_GUARD(this->timer_heap_mutex, obj);

  54:     pj_timer_heap_schedule(this->timer_heap, entry, delay);

  55: }

  56:  

  57: //取消一个定时器：从堆上删除一个entry

  58: void CInterFace::stop_timer(pj_timer_entry* entry)

  59: {

  60:     if ( !this->thread_running())

  61:         return;

  62:  

  63:     SIP_GUARD(this->timer_heap_mutex, obj);

  64:     pj_timer_heap_cancel(this->timer_heap, entry);

  65: }

  66:  

  67: //启动上报速度和进度的定时器

  68: bool CBaseFile::start_timer_speedProgress()

  69: {

  70:     this->m_timer_speed_tval.msec = 0;

  71:     this->m_timer_speed_tval.sec = 1;

  72:     this->m_timer_speed.user_data = this;

  73:     this->m_timer_speed.cb = &CBaseFile::callback_speed;

  74:     SIP_GUARD(this->m_run_speed_mutex, obj);

  75:     this->m_run_speed = true;

  76:     CInterFace::instance()->start_timer(&this->m_timer_speed, &this->m_timer_speed_tval);

  77:     return true;

  78: }

  79:  

  80: //取消上报进度和速度的定时器

  81: void CBaseFile::stop_timer_speedProgress()

  82: {

  83:     SIP_GUARD(this->m_run_speed_mutex, obj);

  84:     this->m_run_speed = false;

  85:     CInterFace::instance()->stop_timer(&this->m_timer_speed);

  86: }

  87:  

  88: //上报进度和速度的回调函数

  89: void CBaseFile::callback_speed(pj_timer_heap_t *timer_heap, pj_timer_entry *entry)

  90: {

  91:     // 上报速度和状态的的

  92:     if (entry->user_data != NULL)

  93:     {

  94:         CBaseFile *file = (CBaseFile*)entry->user_data;

  95:  

  96:         uint speed_ = 0;

  97:         uint progress_ = 0;

  98:         file->get_speed_progress(speed_, progress_);

  99:  

 100:         if ( file->m_ice_session->is_running())

 101:         {

 102:             CInterFace::instance()->report_speed(

 103:                 file->get_userid().c_str(), 

 104:                 file->get_fileName().c_str(), 

 105:                 file->get_guid(), 

 106:                 speed_, 

 107:                 progress_);

 108:         }

 109:  

 110:         // 由于定时select出来后，就从堆上删除了；所以需要一直触发的定时器，

 111:         // 就必须在回调函数中，重新想堆中添加entry！

 112:         SIP_GUARD(file->m_run_speed_mutex, obj);

 113:         if ( file->m_run_speed)

 114:             CInterFace::instance()->start_timer(entry, &file->m_timer_speed_tval);

 115:     }

 116: }

6.pj_str_t字符串

 

7.socket的封装和使用

转至：http://www.zhimax.com/article/tcp/pjlib.html