live555 实现一个最简单的RTSP服务器

用live555中的库写了一个最简单的RTSPServer程序，仅用于学习目的。从下例的代码中，可以清析的明白RTSPServer的函数调用流程。

#include <BasicUsageEnvironment.hh>  
#include "liveMedia.hh"  
  
  
static ServerMediaSession* createNewSMS(UsageEnvironment& env, char const* fileName);  
  
  
int main()  
{  
    TaskScheduler* scheduler;  
    UsageEnvironment* env ;  
    RTSPServer* rtspServer;  
    ServerMediaSession* sms;  
    //创建任务调用器  
    scheduler = BasicTaskScheduler::createNew();  
  
  
    //创建交互环境  
    env = BasicUsageEnvironment::createNew(*scheduler);  
  
  
    //创建RTSP服务器  
    rtspServer = RTSPServer::createNew(*env,554);    //使用554端口  
    if(rtspServer == NULL)  
    {  
        rtspServer = RTSPServer::createNew(*env,8554);   //554端口被占用，就使用8554端口  
    }  
  
  
    //打印服务器地址  
    *env << "Play streams from this server using the URL\n\t"  
         << rtspServer->rtspURLPrefix() << "<filename>.\n";  
  
  
    //创建session  
    sms = createNewSMS(*env, "test.mpg");  
    rtspServer->addServerMediaSession(sms);  
  
  
    //添加其它文件对应的session...  
  
  
    //进行事件循环  
    env->taskScheduler().doEventLoop(); // does not return  
  
  
    return 0;  
}  
  
  
static ServerMediaSession* createNewSMS(UsageEnvironment& env, char const* fileName)  
{  
    char const* extension = strrchr(fileName, '.');  
    ServerMediaSession* sms = NULL;  
    Boolean reuseSource = False;    //不重用source  
  
  
    sms = ServerMediaSession::createNew(env, fileName);  //创建一个session  
  
  
    //  
    //在session中添加subssesion  
    //  
    if(strcmp(extension, ".aac") == 0)  
    {  
        sms->addSubsession(ADTSAudioFileServerMediaSubsession::createNew(env, fileName, reuseSource));  
    }  
    else if(strcmp(extension, ".264") == 0)  
    {  
        sms->addSubsession(H264VideoFileServerMediaSubsession::createNew(env, fileName, reuseSource));  
    }  
    else if(strcmp(extension, ".mpg") == 0)  
    {  
        MPEG1or2FileServerDemux* demux  
          = MPEG1or2FileServerDemux::createNew(env, fileName, reuseSource);  
        sms->addSubsession(demux->newVideoServerMediaSubsession());  
        sms->addSubsession(demux->newAudioServerMediaSubsession());  
    }  
  
  
    //添加其它媒体格式支持...  
  
  
    return sms;  
}