Пример #1
0
/* 用当前RTSPSession构造一个OSRef实例, 在RTPSession Map(Hash表)中注册并加入该引用OSRef元(其key值唯一),
同时更新qtssSvrClientSessions的属性,及QTSServerInterface中的总RTPSession数 */
QTSS_Error  RTPSession::Activate(const StrPtrLen& inSessionID)
{
    //Set the session ID for this session

	/* 用入参配置fRTSPSessionIDBuf的值(是C-String) */
    Assert(inSessionID.Len <= QTSS_MAX_SESSION_ID_LENGTH);
    ::memcpy(fRTSPSessionIDBuf, inSessionID.Ptr, inSessionID.Len);
    fRTSPSessionIDBuf[inSessionID.Len] = '\0';

	/* 用C-String的fRTSPSessionIDBuf设置qtssCliSesRTSPSessionID的属性值 */
    this->SetVal(qtssCliSesRTSPSessionID, &fRTSPSessionIDBuf[0], inSessionID.Len);
    
	/* 用qtssCliSesRTSPSessionID的属性值来得到一个RTPSession Map的引用OSRef元 */
    fRTPMapElem.Set(*this->GetValue(qtssCliSesRTSPSessionID), this);
    
	/* 获取服务器接口 */
    QTSServerInterface* theServer = QTSServerInterface::GetServer();
    
    //Activate puts the session into the RTPSession Map
	/* 在RTPSession Map(Hash表)中注册并加入一个引用OSRef,若字符串标识唯一,就能成功返回OS_NoErr;若有一个相同key值的元素,就返回错误EPERM  */
    QTSS_Error err = theServer->GetRTPSessionMap()->Register(&fRTPMapElem);
	//若有同名键值,立即返回
    if (err == EPERM)
        return err;

	/* 确保key值唯一 */
    Assert(err == QTSS_NoErr);
    
    //
    // Adding this session into the qtssSvrClientSessions attr and incrementing the number of sessions must be atomic
	/* 锁定服务器对象 */
    OSMutexLocker locker(theServer->GetMutex()); 

    //
    // Put this session into the qtssSvrClientSessions attribute of the server
#if DEBUG
    Assert(theServer->GetNumValues(qtssSvrClientSessions) == theServer->GetNumRTPSessions());//确保属性qtssSvrClientSessions中的RTPSession个数和服务器中实际的个数相同
#endif
	/* 设置qtssSvrClientSessions的第GetNumRTPSessions()个RTPSession的属性 */
    RTPSession* theSession = this;
    err = theServer->SetValue(qtssSvrClientSessions, theServer->GetNumRTPSessions(), &theSession, sizeof(theSession), QTSSDictionary::kDontObeyReadOnly);
    Assert(err == QTSS_NoErr);
    
#if DEBUG
    fActivateCalled = true;
#endif
	/* 及时更新QTSServerInterface中的总RTPSession数  */
    QTSServerInterface::GetServer()->IncrementTotalRTPSessions();
    return QTSS_NoErr;
}
Пример #2
0
QTSS_Error  RTPSession::Activate(const StrPtrLen& inSessionID)
{
    //Set the session ID for this session
    Assert(inSessionID.Len <= QTSS_MAX_SESSION_ID_LENGTH);
    ::memcpy(fRTSPSessionIDBuf, inSessionID.Ptr, inSessionID.Len);
    fRTSPSessionIDBuf[inSessionID.Len] = '\0';
    this->SetVal(qtssCliSesRTSPSessionID, &fRTSPSessionIDBuf[0], inSessionID.Len);
    
    fRTPMapElem.Set(*this->GetValue(qtssCliSesRTSPSessionID), this);
    
    QTSServerInterface* theServer = QTSServerInterface::GetServer();
    
    //Activate puts the session into the RTPSession Map
    QTSS_Error err = theServer->GetRTPSessionMap()->Register(&fRTPMapElem);
    if (err == EPERM)
        return err;
    Assert(err == QTSS_NoErr);
    
    //
    // Adding this session into the qtssSvrClientSessions attr and incrementing the number of sessions must be atomic
    OSMutexLocker locker(theServer->GetMutex()); 

    //
    // Put this session into the qtssSvrClientSessions attribute of the server
#if DEBUG
    Assert(theServer->GetNumValues(qtssSvrClientSessions) == theServer->GetNumRTPSessions());
#endif
    RTPSession* theSession = this;
    err = theServer->SetValue(qtssSvrClientSessions, theServer->GetNumRTPSessions(), &theSession, sizeof(theSession), QTSSDictionary::kDontObeyReadOnly);
    Assert(err == QTSS_NoErr);
    
#if DEBUG
    fActivateCalled = true;
#endif
    QTSServerInterface::GetServer()->IncrementTotalRTPSessions();
    return QTSS_NoErr;
}
Пример #3
0
RTPSession::~RTPSession()
{
    // Delete all the streams
    RTPStream** theStream = NULL;
    UInt32 theLen = 0;
    
	/* 假如预设值能打印RUDP信息 */
    if (QTSServerInterface::GetServer()->GetPrefs()->GetReliableUDPPrintfsEnabled())
    {
        SInt32 theNumLatePacketsDropped = 0;/* 丢弃延迟包个数 */
        SInt32 theNumResends = 0; /* 重传包个数 */
        
		/* 遍历该RTPSession的每个RTPStream,计算丢弃的过时包总数和重传包总数 */
        for (int x = 0; this->GetValuePtr(qtssCliSesStreamObjects, x, (void**)&theStream, &theLen) == QTSS_NoErr; x++)
        {
            Assert(theStream != NULL);
            Assert(theLen == sizeof(RTPStream*));
            if (*theStream != NULL)
            {
				/* 计算丢弃的过时包总数 */
                theNumLatePacketsDropped += (*theStream)->GetStalePacketsDropped();
				/* 得到重传包总数 */
                theNumResends += (*theStream)->GetResender()->GetNumResends();
            }
        }
        
		/* 得到客户端请求播放文件的Full URL */
        char* theURL = NULL;
        (void)this->GetValueAsString(qtssCliSesFullURL, 0, &theURL);
        Assert(theURL != NULL);
        /* 获得RTPBandwidthTracker类 */
        RTPBandwidthTracker* tracker = this->GetBandwidthTracker(); 
    
        qtss_printf("Client complete. URL: %s.\n",theURL);
        qtss_printf("Max congestion window: %ld. Min congestion window: %ld. Avg congestion window: %ld\n", tracker->GetMaxCongestionWindowSize(), tracker->GetMinCongestionWindowSize(), tracker->GetAvgCongestionWindowSize());
        qtss_printf("Max RTT: %ld. Min RTT: %ld. Avg RTT: %ld\n", tracker->GetMaxRTO(), tracker->GetMinRTO(), tracker->GetAvgRTO());
        qtss_printf("Num resends: %ld. Num skipped frames: %ld. Num late packets dropped: %ld\n", theNumResends, this->GetFramesSkipped(), theNumLatePacketsDropped);
        
        delete [] theURL;
    }
    
	/* 遍历该RTPSession的每个RTPStream,逐一删除它们 */
    for (int x = 0; this->GetValuePtr(qtssCliSesStreamObjects, x, (void**)&theStream, &theLen) == QTSS_NoErr; x++)
    {
        Assert(theStream != NULL);
        Assert(theLen == sizeof(RTPStream*));
        
        if (*theStream != NULL)
            delete *theStream;
    }
    
	/* 获取服务器接口类,逐一将该RTPSession从qtssSvrClientSessions属性中删去 */
    QTSServerInterface* theServer = QTSServerInterface::GetServer();
    {
        OSMutexLocker theLocker(theServer->GetMutex());
        
        RTPSession** theSession = NULL;
        
        // Remove this session from the qtssSvrClientSessions attribute
        UInt32 y = 0;
        for ( ; y < theServer->GetNumRTPSessions(); y++)
        {
            QTSS_Error theErr = theServer->GetValuePtr(qtssSvrClientSessions, y, (void**)&theSession, &theLen, true);
            Assert(theErr == QTSS_NoErr);
            
            if (*theSession == this)
            {
                theErr = theServer->RemoveValue(qtssSvrClientSessions, y, QTSSDictionary::kDontObeyReadOnly);
                break;
            }
        }

        Assert(y < theServer->GetNumRTPSessions());
        theServer->AlterCurrentRTPSessionCount(-1);
        if (!fIsFirstPlay) // The session was started playing (the counter ignores additional pause-play changes while session is active)
            theServer->AlterRTPPlayingSessions(-1);
        
    }


    //we better not be in the RTPSessionMap anymore!
#if DEBUG
    Assert(!fRTPMapElem.IsInTable());
	StrPtrLen theRTSPSessionID(fRTSPSessionIDBuf,sizeof(fRTSPSessionIDBuf));
	/* 从RTPSession Map中删去它们 */
    OSRef* theRef = QTSServerInterface::GetServer()->GetRTPSessionMap()->Resolve(&theRTSPSessionID);
    Assert(theRef == NULL);
#endif
}