文如其名,最近在做的项目要求利用RTSP协议转发处理完的H264视频数据给上一层客户端,环境是Windows的VS2013,于是就各种百度谷歌找代码。结果在得到利用live555去做比较简单的结论的同时也悲情地发现,网上别人贴出来的代码基本都是Linux上面的。在修改了两份来适用于Windows无效后,又一次陷入了百度谷歌的无尽搜索中。Anyway,最后终于解决了,所以贴出代码跟大家分享下,希望能给和我需求相似的童鞋一点启发,也希望有高手指正其中的问题。
用live555进行RTSP的播放基本上是通过修改其给出来的播放本地文件的DEMO来实现的。但由于其DEMO封装的比较深,所以要直接修改他的fread处的代码变成内存拷贝来实现实时传输会显得比较别扭。本文参考了网上的一些代码,自定义了一个继承自H264VideoFileServerMediaSubsession的类来来进行处理,同时定义了一个继承自FramedSource的类来做内存的拷贝操作,该类亦是区别于读本地文件和实时流之紧要处。
一口气杂七杂八说了好多,下面贴出代码吧。如果觉得需要或者懒得自己搭建live555的环境亦可以在文中最后的链接中下载该工程(环境为VS2013),如果你的VS版本合适即可直接运行。
主文件(程序入口)
#include "H264LiveVideoServerMediaSubssion.hh" #include "H264FramedLiveSource.hh" #include "liveMedia.hh" #include "BasicUsageEnvironment.hh" #define BUFSIZE 1024*200 static void announceStream(RTSPServer* rtspServer, ServerMediaSession* sms,char const* streamName)//显示RTSP连接信息 { char* url = rtspServer->rtspURL(sms); UsageEnvironment& env = rtspServer->envir(); env <<streamName<< "\n"; env << "Play this stream using the URL \"" << url << "\"\n"; delete[] url; } int main(int argc, char** argv) { //设置环境 UsageEnvironment* env; Boolean reuseFirstSource = False;//如果为“true”则其他接入的客户端跟第一个客户端看到一样的视频流,否则其他客户端接入的时候将重新播放 TaskScheduler* scheduler = BasicTaskScheduler::createNew(); env = BasicUsageEnvironment::createNew(*scheduler); //创建RTSP服务器 UserAuthenticationDatabase* authDB = NULL; RTSPServer* rtspServer = RTSPServer::createNew(*env, 8554, authDB); if (rtspServer == NULL) { *env << "Failed to create RTSP server: " << env->getResultMsg() << "\n"; exit(1); } char const* descriptionString= "Session streamed by \"testOnDemandRTSPServer\""; //模拟实时流发送相关变量 int datasize;//数据区长度 unsigned char* databuf;//数据区指针 databuf = (unsigned char*)malloc(1024*1024); bool dosent;//rtsp发送标志位,为true则发送,否则退出 //从文件中拷贝1M数据到内存中作为实时网络传输内存模拟,如果实时网络传输应该是双线程结构,记得在这里加上线程锁 //此外实时传输的数据拷贝应该是发生在H264FramedLiveSource文件中,所以这里只是自上往下的传指针过去给它 FILE *pf; fopen_s(&pf, "test.264", "rb"); fread(databuf, 1, BUFSIZE, pf); datasize = BUFSIZE; dosent = true; fclose(pf); //上面的部分除了模拟网络传输的部分外其他的基本跟live555提供的demo一样,而下面则修改为网络传输的形式,为此重写addSubsession的第一个参数相关文件 char const* streamName = "h264ESVideoTest"; ServerMediaSession* sms = ServerMediaSession::createNew(*env, streamName, streamName,descriptionString); sms->addSubsession(H264LiveVideoServerMediaSubssion::createNew(*env, reuseFirstSource, &datasize, databuf,&dosent));//修改为自己实现的H264LiveVideoServerMediaSubssion rtspServer->addServerMediaSession(sms); announceStream(rtspServer, sms, streamName);//提示用户输入连接信息 env->taskScheduler().doEventLoop(); //循环等待连接 free(databuf);//释放掉内存 return 0; }
自定义H264VideoFileServerMediaSubsession类
H264VideoFileServerMediaSubsession.hh
#ifndef _H264_LIVE_VIDEO_SERVER_MEDIA_SUBSESSION_HH #define _H264_LIVE_VIDEO_SERVER_MEDIA_SUBSESSION_HH #include "H264VideoFileServerMediaSubsession.hh" class H264LiveVideoServerMediaSubssion : public H264VideoFileServerMediaSubsession { public: static H264LiveVideoServerMediaSubssion* createNew(UsageEnvironment& env, Boolean reuseFirstSource, int *datasize, unsigned char* databuf, bool *dosent); protected: // we're a virtual base class H264LiveVideoServerMediaSubssion(UsageEnvironment& env, Boolean reuseFirstSource, int *datasize, unsigned char* databuf, bool *dosent); ~H264LiveVideoServerMediaSubssion(); protected: // redefined virtual functions FramedSource* createNewStreamSource(unsigned clientSessionId,unsigned& estBitrate); public: char fFileName[100]; int *Server_datasize;//数据区大小指针 unsigned char* Server_databuf;//数据区指针 bool *Server_dosent;//发送标示 }; #endif
H264VideoFileServerMediaSubsession.cpp
#include "H264LiveVideoServerMediaSubssion.hh" #include "H264FramedLiveSource.hh" #include "H264VideoStreamFramer.hh" H264LiveVideoServerMediaSubssion* H264LiveVideoServerMediaSubssion::createNew(UsageEnvironment& env, Boolean reuseFirstSource, int *datasize, unsigned char* databuf, bool *dosent) { return new H264LiveVideoServerMediaSubssion(env, reuseFirstSource, datasize, databuf, dosent); } H264LiveVideoServerMediaSubssion::H264LiveVideoServerMediaSubssion(UsageEnvironment& env, Boolean reuseFirstSource, int *datasize, unsigned char* databuf, bool *dosent) : H264VideoFileServerMediaSubsession(env, fFileName, reuseFirstSource)//H264VideoFileServerMediaSubsession不是我们需要修改的文件, //但是我们又要用它来初始化我们的函数, //所以给个空数组进去即可 { Server_datasize = datasize;//数据区大小指针 Server_databuf = databuf;//数据区指针 Server_dosent = dosent;//发送标示 } H264LiveVideoServerMediaSubssion::~H264LiveVideoServerMediaSubssion() { } FramedSource* H264LiveVideoServerMediaSubssion::createNewStreamSource(unsigned clientSessionId, unsigned& estBitrate) { /* Remain to do : assign estBitrate */ estBitrate = 1000; // kbps, estimate //创建视频源 H264FramedLiveSource* liveSource = H264FramedLiveSource::createNew(envir(), Server_datasize, Server_databuf, Server_dosent); if (liveSource == NULL) { return NULL; } // Create a framer for the Video Elementary Stream: return H264VideoStreamFramer::createNew(envir(), liveSource); }
自定义H264FramedLiveSource类
H264FramedLiveSource.hh
#ifndef _H264FRAMEDLIVESOURCE_HH #define _H264FRAMEDLIVESOURCE_HH #include <FramedSource.hh> class H264FramedLiveSource : public FramedSource { public: static H264FramedLiveSource* createNew(UsageEnvironment& env, int *datasize, unsigned char* databuf, bool *dosent, unsigned preferredFrameSize = 0, unsigned playTimePerFrame = 0); protected: H264FramedLiveSource(UsageEnvironment& env, int *datasize, unsigned char* databuf, bool *dosent, unsigned preferredFrameSize, unsigned playTimePerFrame); ~H264FramedLiveSource(); private: virtual void doGetNextFrame(); int TransportData(unsigned char* to, unsigned maxSize); protected: int *Framed_datasize;//数据区大小指针 unsigned char *Framed_databuf;//数据区指针 bool *Framed_dosent;//发送标示 int readbufsize;//记录已读取数据区大小 int bufsizel;//记录数据区大小 }; #endif
H264FramedLiveSource.cpp
#include "H264FramedLiveSource.hh" H264FramedLiveSource::H264FramedLiveSource(UsageEnvironment& env, int *datasize, unsigned char* databuf, bool *dosent, unsigned preferredFrameSize, unsigned playTimePerFrame) : FramedSource(env) { Framed_datasize = datasize;//数据区大小指针 Framed_databuf = databuf;//数据区指针 Framed_dosent = dosent;//发送标示 } H264FramedLiveSource* H264FramedLiveSource::createNew(UsageEnvironment& env, int *datasize, unsigned char* databuf, bool *dosent, unsigned preferredFrameSize, unsigned playTimePerFrame) { H264FramedLiveSource* newSource = new H264FramedLiveSource(env, datasize, databuf, dosent, preferredFrameSize, playTimePerFrame); return newSource; } H264FramedLiveSource::~H264FramedLiveSource() { } void H264FramedLiveSource::doGetNextFrame() { if (*Framed_dosent == true) { *Framed_dosent = false; bufsizel = *Framed_datasize; readbufsize = 0; fFrameSize = fMaxSize; memcpy(fTo, Framed_databuf + readbufsize, fFrameSize); readbufsize += fFrameSize; } else { if (bufsizel - readbufsize>fMaxSize) { fFrameSize = fMaxSize; memcpy(fTo, Framed_databuf + readbufsize, fFrameSize); readbufsize += fFrameSize; } else { memcpy(fTo, Framed_databuf + readbufsize, bufsizel - readbufsize); *Framed_dosent = true; } } nextTask() = envir().taskScheduler().scheduleDelayedTask(0,(TaskFunc*)FramedSource::afterGetting, this);//表示延迟0秒后再执行 afterGetting 函数 return; }
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时间: 2024-10-12 19:02:24