// C0, C1, C2, S0, S1, S2
int RTMP_LiveConn::Handshake()
{
    RTMP_UINT8 buf_C0[1];
    RTMP_UINT8 buf_S0[1];
    int n;

    buf_C0[0] = RTMP_VERSION;
    m_pLogger->Write(LOG_NORMAL,"Send C0.");
    if(m_iSock.Send(buf_C0, 1) <0)
    {
        printf("failed to send C0.\n");
        return -1;
    }

    // 起时时间
    RTMP_UINT32 timestamp = 0;
    m_iSysClock.Reset();

    RTMP_UINT8 buf_C1[1536];
    if(1)
    {
        RTMP_Encoder enc(buf_C1);
        enc.PutUint32(timestamp);
        enc.PutPadding(4, 0);
    }

    m_pLogger->Write(LOG_NORMAL,"Send C1.");
    if(m_iSock.Send(buf_C1, 1536) <0)
    {
        printf("failed to send C1.\n");
        return -1;
    }

    // 接收S0
    m_pLogger->Write(LOG_NORMAL,"Recv S0.");
    n = m_iSock.Recv(buf_S0,1);
    if(n != 1)
    {
        printf("failed to recv S0.\n");
        return -1;
    }
    if(buf_S0[0] != RTMP_VERSION)
    {
        printf("S0 error. \n");
        return -1;
    }

    // 接收S1
    m_pLogger->Write(LOG_NORMAL,"Recv S1.");
    RTMP_UINT8 buf_S1[1536];
    TryRecvAll(1536);
    n = m_nBytesNum;
    if(n != 1536)
    {
        printf("error: S1 length %d bytes.\n", n);
        return -1;
    }
    memcpy(buf_S1, m_pBytes, n);

    // 发送C2 (C2=S1)
    RTMP_UINT8 buf_C2[1536];
    memcpy(buf_C2, buf_S1, 1536);
    if(1)
    {
        RTMP_Encoder enc(buf_C2);
        enc.Skip(4);

        // 计算时间
        RTMP_UINT32 timestamp = m_iSysClock.Update();
        enc.PutUint32(timestamp);    
    }
    m_pLogger->Write(LOG_NORMAL,"Send C2.");
    if(m_iSock.Send(buf_C2, 1536) < 0)
    {
        printf("failed to send C2.\n");
        return -1;
    }

    // 接收S2 (SHOULD == C1)
    m_pLogger->Write(LOG_NORMAL,"Recv S2.");
    RTMP_UINT8 buf_S2[1536];
    TryRecvAll(1536);
    n = m_nBytesNum;
    if(n != 1536) 
    {
        printf("error: S2 length %d bytes.", n);
        return -1;
    }
    memcpy(buf_S2, m_pBytes, n);

    if(memcmp(buf_C1+8, buf_S2+8, 1528) != 0)
    {
        printf("S2 != C1 \n");
        return -1;
    }
    timestamp = 0;
    if(1)
    {
        RTMP_Decoder dec(buf_S2+4);
        timestamp = dec.GetUint32();
        printf("time delta = %d ms\n", timestamp);
    }

    return 0;
}