transbuf.cpp

著名的 helix realplayer 基于手机 symbian 系统的 播放器全套源代码

        uTestSequenceNumber < m_uACKSequenceNumber ||
        uTestSequenceNumber >= m_wrapSequenceNumber)
    {
        for (i = 0; i < iACKCount; i++)
        {
            if (m_bIsEnded && m_uACKSequenceNumber == m_uEndSequenceNumber)
            {
                m_bACKDone = TRUE;
                break;
            }

            m_uACKSequenceNumber++;

            if (m_uACKSequenceNumber == m_wrapSequenceNumber)
            {
                m_uACKSequenceNumber = 0;
            }
        }
    }
    else
    {
        m_uACKSequenceNumber = uTestSequenceNumber;
    }

    return HXR_OK;
}

UINT32
RTSPTransportBuffer::GetIndex(UINT32 uBaseSequenceNumber, UINT16 uSeqNo)
{
    INT32 index = uSeqNo - uBaseSequenceNumber;

    if(index < 0)
    {
        index = m_wrapSequenceNumber - uBaseSequenceNumber + uSeqNo;
    }

    return (UINT32)index;
}

void
RTSPTransportBuffer::SetEndPacket
(
    UINT16 uSeqNo,
    UINT16 uReliableSeqNo,
    BOOL   bPacketSent,
    UINT32 uTimestamp
)
{
    if (m_bIsEnded)
    {
        return;
    }

    //We have just received the last packet. Since we are getting no
    //more packets, make sure we go through the pending packets list
    //and send NAKs for each packet we have not recieved or got out
    //of order.
    m_pPendingLock->Lock();
    while(!m_PendingPackets.IsEmpty())
    {
        PendingPacket* pPend = (PendingPacket*)m_PendingPackets.RemoveHead();
        UINT32 tempIndex = GetPacketIndex((UINT16)pPend->m_ulSequenceNumber);
                
        //Send a NAK and increment resend requested count.
        m_pOwner->sendNAKPacket(m_uStreamNumber,
                                (UINT16)pPend->m_ulSequenceNumber,
                                (UINT16)pPend->m_ulSequenceNumber);
        if( tempIndex<m_pPacketDeque->size())
            ((ClientPacket*)(*m_pPacketDeque)[tempIndex])->SetResendRequested();
        m_uResendRequested++;
        //Clean up.
        HX_DELETE(pPend);
    }
    //We also don't need to call func anymore for this object.
    if (m_pScheduler && m_CallbackHandle)
    {
        m_pScheduler->Remove(m_CallbackHandle);
    }
    m_CallbackHandle = 0;
    if( m_pCallBack )
        m_pCallBack->Clear();
    
    HX_RELEASE( m_pCallBack );
    m_pPendingLock->Unlock();

    m_bIsEnded = TRUE;
    m_uEndSequenceNumber = uSeqNo;

    UINT32 uEndIndex = GetPacketIndex(m_uEndSequenceNumber);

    // XXX HP we have too many empty queue determination
    // i.e. m_bQueueIsEmpty
    //      uEndIndex > MAX_DEQUEUE_SIZE
    //      m_pPacketDeque->empty() == TRUE
    //      m_pPacketDeque->size() == 0
    if (!bPacketSent || (uEndIndex > MAX_DEQUE_SIZE && m_bCacheIsEmpty))
    {
        /*
         * Either no packets were sent or the end packet has come
         * after the last packet has been released, so just send
         * stream done notification
         */

        m_bStreamDone = TRUE;
        m_bStreamDoneSent = TRUE;
        m_pOwner->streamDone(m_uStreamNumber);

        return;
    }

    /*
     * Since the buffer duration restriction is now lifted, the player
     * can get all the packets in the buffer. That means all the packets
     * must exist, so fill in the end of the queue with temporary "lost"
     * packets
     */

    ClientPacket* pPacket = new ClientPacket(uSeqNo,
                                             uReliableSeqNo,
                                             uTimestamp,
                                             0,
                                             0,
                                             0,
                                             GetTime(),
                                             FALSE);

    pPacket->AddRef();
    Add(pPacket);

    m_uEndReliableSeqNo = uReliableSeqNo;

    CheckForSourceDone();
}

void
RTSPTransportBuffer::InformSourceStopped
(
    void
)
{
    m_bSourceStopped = TRUE;
}

void
RTSPTransportBuffer::InformTimestampRange
(
    UINT32 ulStartTimestamp,
    UINT32 ulEndTimestamp,
    UINT32 ulEndDelayTolerance
)
{
    m_uStartTimestamp = ulStartTimestamp;
    m_uEndTimestamp = ulEndTimestamp;
    m_ulEndDelayTolerance = ulEndDelayTolerance;
    m_bExpectedTSRangeSet = TRUE;
}
            
HX_RESULT
RTSPTransportBuffer::UpdateStatistics
(
    ULONG32& ulNormal,
    ULONG32& ulLost,
    ULONG32& ulLate,
    ULONG32& ulResendRequested,
    ULONG32& ulResendReceived,
    ULONG32& ulAvgBandwidth,
    ULONG32& ulCurBandwidth,
    ULONG32& ulTotal30,
    ULONG32& ulLost30,
    ULONG32& ulDuplicate,
    ULONG32& ulOutOfOrder
)
{
    if (!m_bIsInitialized)
    {
        return HXR_NO_DATA;
    }

    ulNormal            = m_uNormal;
    ulLost              = m_uLost;
    ulLate              = m_uLate;
    ulResendRequested   = m_uResendRequested;
    ulResendReceived    = m_uResendReceived;
    ulLost30            = m_ulLastLost30;
    ulTotal30           = m_ulLastTotal30;
    ulAvgBandwidth      = m_uAvgBandwidth;
    ulCurBandwidth      = m_uCurBandwidth;
    ulDuplicate         = m_ulDuplicate;
    ulOutOfOrder        = m_ulOutOfOrder;

    if (m_bIsEnded)
    {
        ulAvgBandwidth  = m_uAvgBandwidth = 0;
        ulCurBandwidth  = m_uCurBandwidth = 0;
        return HXR_OK;
    }

    if (m_bPaused || m_bPausedHack)
    {
        /*
         * This hack is needed because the server may send out an
         * extra packet when the stream is paused, and this unsettles
         * the bandwidth statistics when the stream is resumed
         */

        if (!m_bPaused && m_bPausedHack)
        {
            m_bPausedHack = FALSE;
        }

        return HXR_OK;
    }

    // caculate the lost/total packets during the last 30 seconds   
    m_ulLost30[m_ulIndex30 % 30] = m_uLost;
    m_ulTotal30[m_ulIndex30 % 30] = m_uNormal + m_uLost + m_uLate + m_uResendReceived;

    ulLost30 = m_ulLost30[m_ulIndex30 % 30] - 
               m_ulLost30[(m_ulIndex30 + 1) % 30];
    ulTotal30 = m_ulTotal30[m_ulIndex30 % 30] -
                m_ulTotal30[(m_ulIndex30 + 1) % 30];

    m_ulLastLost30  = ulLost30;
    m_ulLastTotal30 = ulTotal30;

    m_ulIndex30++;

    HXTimeval lTime = m_pScheduler->GetCurrentSchedulerTime();
    Timeval now((INT32)lTime.tv_sec, (INT32)lTime.tv_usec);

    /*
     * Must adjust m_StartTime and m_LastTime for the amount of time the
     * client has been paused
     */

    Timeval TotalTime = now - AdjustedStartTime(&m_StatisticsTime);
    Timeval TimeSlice = now - AdjustedLastTime(&m_StatisticsTime);

    UpdateTime(&m_StatisticsTime);

    if (TotalTime <= 0.0 || TimeSlice <= 0.0)
    {
        /*
         * This should not happen
         */

        return HXR_UNEXPECTED;
    }

    double uTotalSeconds = TotalTime.tv_sec + (TotalTime.tv_usec / 1000000.0);
    double uRecentSeconds = TimeSlice.tv_sec + (TimeSlice.tv_usec / 1000000.0);
    INT64 uBitCount = m_uByteCount * 8;
    INT64 uRecentBitCount = (m_uByteCount - m_uLastByteCount) * 8;

    m_uAvgBandwidth = INT64_TO_UINT32(uBitCount / uTotalSeconds);
    m_uCurBandwidth = INT64_TO_UINT32(uRecentBitCount / uRecentSeconds);

    ulAvgBandwidth = m_uAvgBandwidth;
    ulCurBandwidth = m_uCurBandwidth;

    m_uLastByteCount = m_uByteCount;

    return HXR_OK;
}

void
RTSPTransportBuffer::InitializeTime(BufferTimer* Timer)
{
    HXTimeval lTime = m_pScheduler->GetCurrentSchedulerTime();

    Timer->m_StartTime = Timeval((INT32)lTime.tv_sec, (INT32)lTime.tv_usec);
    Timer->m_PreviousTime = Timeval((INT32)lTime.tv_sec, (INT32)lTime.tv_usec);
    Timer->m_LastTime = Timeval((INT32)lTime.tv_sec, (INT32)lTime.tv_usec);    
    Timer->m_PauseTime = Timeval(0.0);
}

void
RTSPTransportBuffer::UpdateTime(BufferTimer* Timer)
{
    HXTimeval lTime = m_pScheduler->GetCurrentSchedulerTime();
    Timeval now((INT32)lTime.tv_sec, (INT32)lTime.tv_usec);

    Timer->m_LastTime += now - Timer->m_PreviousTime;
    Timer->m_PreviousTime = now;
}

Timeval
RTSPTransportBuffer::GetTime(BufferTimer* Timer)
{
    return Timer->m_LastTime;
}

Timeval
RTSPTransportBuffer::GetTime()
{
    /*
     * Use m_PacketTime for GetTime() references
     */

    UpdateTime(&m_PacketTime);

    return GetTime(&m_PacketTime);
}

Timeval
RTSPTransportBuffer::AdjustedStartTime(BufferTimer* Timer)
{
    return Timer->m_StartTime + Timer->m_PauseTime;
}

Timeval
RTSPTransportBuffer::AdjustedLastTime(BufferTimer* Timer)
{
    return Timer->m_LastTime + Timer->m_PauseTime;
}

void
RTSPTransportBuffer::SetMulticast() 
{ 
    m_bMulticast = TRUE; 

    m_bSparseStream = m_pOwner->isSparseStream(m_uStreamNumber);
}

void
RTSPTransportBuffer::Pause()
{    
    HXTimeval lTime = m_pScheduler->GetCurrentSchedulerTime();
    Timeval now((INT32)lTime.tv_sec, (INT32)lTime.tv_usec);

    m_bPaused = TRUE;

    m_StatisticsTime.m_LastTime += now - m_StatisticsTime.m_PreviousTime;
    m_StatisticsTime.m_PreviousTime = now;
    m_PacketTime.m_LastTime += now - m_PacketTime.m_PreviousTime;
    m_PacketTime.m_PreviousTime = now;
}

void
RTSPTransportBuffer::Resume()
{
    if (m_bPaused)
    {
        HXTimeval lTime = m_pScheduler->GetCurrentSchedulerTime();
        Timeval now((INT32)lTime.tv_sec, (INT32)lTime.tv_usec);

        m_bPaused = FALSE;
        m_bPausedHack = TRUE;

        m_StatisticsTime.m_PauseTime += now - m_StatisticsTime.m_PreviousTime;
        m_StatisticsTime.m_PreviousTime = now;
        m_PacketTime.m_PauseTime += now - m_PacketTime.m_PreviousTime;
        m_PacketTime.m_PreviousTime = now;

        m_ulBufferingStartTime  = HX_GET_TICKCOUNT();
        m_uLastByteCount                = m_uByteCount;
    }
}

void
RTSPTransportBuffer::SanitizePacketQueue()
{
    m_uLastSequenceNumber = m_uFirstSequenceNumber;

    /*
     * Put a temporary "lost" packet at the head of the queue to make
     * it sane. The timestamp must be set to that of the last packet
     * removed from the buffer. This prevents the early releasing of a
     * true lost packet
     */

    ClientPacket* pPacket = new ClientPacket(m_uFirstSequenceNumber,
                                             m_uReliableSeqNo,
                                             m_uLastTimestamp,
                                             0,
                                             0,
                                             0,
                                             GetTime(),
                                             TRUE);

    pPacket->AddRef();
    m_pPacketDeque->push_back(pPacket);
}

HX_RESULT
RTSPTransportBuffer::Flush()
{
    ClientPacket* pPacket;

    //We are flushing all the packets. Empty out pending list.
    m_pPendingLock->Lock();
    while( !m_PendingPackets.IsEmpty() )
    {
        PendingPacket* pPend = (PendingPacket*)m_PendingPackets.RemoveHead();
        HX_DELETE(pPend);
    }
    //Get rid of any scheduler events...
    if (m_pScheduler && m_CallbackHandle)
    {
        m_pScheduler->Remove(m_CallbackHandle);
    }
    m_CallbackHandle = 0;
    if( m_pCallBack )
        m_pCallBack->Clear();
    HX_RELEASE( m_pCallBack );
    m_pPendingLock->Unlock();

    while(!m_pPacketDeque->empty())
    {
        pPacket = (ClientPacket*)m_pPacketDeque->front();

        if (pPacket)
        {
            /*
             * Check to see that we are not waiting for a missing pre-seek
             * reliable packet
             */

            if (m_uReliableSeqNo !=
                pPacket->GetReliableSeqNo() - pPacket->IsReliable())
            {
                return HXR_INCOMPLETE;
            }

            UINT32 uSeekIndex = GetSeekIndex(pPacket->GetSequenceNumber());

            if (uSeekIndex == 0)
            {
                m_uLastTimestamp = pPacket->GetTime();
                return HXR_OK;
            }

            pPacket = (ClientPacket*)m_pPacketDeque->pop_front();

            IHXPacket* pIHXPacket = pPacket->GetPacket();

            m_pOwner->packetReady(HXR_OK,
                                  m_uStreamNumber,
                                  pIHXPacket);

            if (pIHXPacket)
            {
                pIHXPacket->Release();      
            }

            UpdateStatsFromPacket(pPacket);

            HX_RELEASE(pPacket);
        }
    }

/*
 * XXXGH...Do I really need to do this?
 *  InitializeTime(&m_PacketTime);
 */

    m_bQueueIsEmpty             = TRUE;