pjsip库简单应用

庄实

2023-12-01

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。

pj_status_t status;

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

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

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

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

```
pj_shutdown();    //pjlib停止
```

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

//系统初始化的时候调用
```
void create()
```
```
{
```

//初始化pjlib库返回PJ_SUCCESS表示成功

```
pj_status_t status = pj_init();
```

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

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

```
//初始化mutex
```

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

```
//创建一个lock给定时器用
```

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

```
//在内存池上开辟一块空间
```

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

```
//创建一个定时器堆
```

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

//给定时器加锁; 将来自动删除该锁，无需手工删除

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

```
}
```
```
//系统退出的时候调用
```
```
void destroy()
```
```
{
```
```
//删除mutex
```
```
pj_mutex_destroy(this->m_pool_mutex);
```
```
//删除定时器的堆
```

pj_timer_heap_destroy(this->timer_heap);

//清理内存池，这一步也可以删略；让caching_pool来清理

```
pj_pool_destroy_int(this->m_pool);
```

//清理缓冲池；所有在缓冲池建立的内存池都会被清理掉

pj_caching_pool_destroy(&this->m_caching);

```
//pjlib停止
```
```
pj_shutdown();
```
```
}
```

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

pj_thread_desc desc;
```
pj_bzero(desc, sizeof(desc));
```
```
pj_thread_t *thread_;
```

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

```
return 0; /* 失败*/
```

function CopyCode(key){var codeElement=null;var trElements=document.all.tags("ol");var i;for(i=0;i

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

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

pjsip库简单应用

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