C++ VideoStream::getMulticastIP方法代码示例

// Thread function for RTP session.
static void* rtpSessionThread(void *arg)
{
    VideoStream* video = reinterpret_cast<VideoStream*>(arg);

    u_int8_t bigBuffer[MAX_FRAME_SIZE];

    unsigned int lastPacketTimestamp = 0;
    unsigned int currentIndex = 0;
    double last_time = 0;

    RTPSession session = createRtpSession(video->getMulticastIP(), 
                                          video->getPort());

    while (1) {
        session.Poll();

        // Distribute data from the session to connected clients if we've
        // got anything
        session.BeginDataAccess();

        if (session.GotoFirstSourceWithData()) {
            do {
                RTPPacket *packet = NULL;

                while ((packet = session.GetNextPacket()) != NULL) {
                    if ((packet->GetPayloadLength() > sizeof(bigBuffer)) || 
                        (packet->GetPayloadLength() == 0)) {
                        // Free the packet, we're not going to use it.
                        session.DeletePacket(packet);
                        continue; // Exit this level of the loop and drop it
                    }

                    // Check timestamps for new data.  A new timestamp means
                    // this is from a different time.
                    if (packet->GetTimestamp() != lastPacketTimestamp) {
                        video->decode((uint8_t*)&bigBuffer[0], currentIndex);

                        currentIndex = 0;
                        memset(&bigBuffer[0], 0, sizeof(bigBuffer));
                    } // End new timestamp optimization.


                    // Copy data into buffer
                    if (currentIndex + packet->GetPayloadLength() > sizeof(bigBuffer)) {
                        throw std::runtime_error("Frame buffer overflow");
                    }

                    memcpy(&bigBuffer[currentIndex], packet->GetPayloadData(),
                           packet->GetPayloadLength());
                    currentIndex += packet->GetPayloadLength();

                    // Mark our last timestamp
                    lastPacketTimestamp = packet->GetTimestamp();

                    // Free the packet.
                    session.DeletePacket(packet);
                } 
            } while (session.GotoNextSourceWithData()); 
        }

        session.EndDataAccess();
        RTPTime delay(0, 100); // 100usec

        // Update More Data
        bool moreData;
        session.WaitForIncomingData(delay, &moreData);
    }

    // Leave the session while sending BYE.
    RTPTime timeout(0.75f); //  Wait briefly.
    const char* reason = "Session Destroyed.";
    unsigned int reasonlen = strlen(reason);

    if (session.IsActive())
        session.BYEDestroy(timeout, reason, reasonlen);
}