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;
}