public void SendRtcpSenderReport(Socket srcRtpSocket, IPEndPoint dstRtpSocket, uint timestamp)
{
try
{
var ntp = RTSPSession.DateTimeToNptTimestamp(DateTime.Now);
var rtcpSRPacket = new RTCPPacket(Ssrc, ntp, timestamp, PacketsSent, OctetsSent);
if (SrtcpProtect == null)
{
srcRtpSocket.SendTo(rtcpSRPacket.GetBytes(), dstRtpSocket);
}
else
{
var rtcpSRBytes = rtcpSRPacket.GetBytes();
byte[] sendBuffer = new byte[rtcpSRBytes.Length + SRTP_AUTH_KEY_LENGTH];
Buffer.BlockCopy(rtcpSRBytes, 0, sendBuffer, 0, rtcpSRBytes.Length);
int rtperr = SrtcpProtect(sendBuffer, sendBuffer.Length - SRTP_AUTH_KEY_LENGTH);
if (rtperr != 0)
{
logger.LogWarning("SRTP RTCP packet protection failed, result " + rtperr + ".");
}
else
{
srcRtpSocket.SendTo(sendBuffer, dstRtpSocket);
}
}
}
catch (Exception excp)
{
logger.LogWarning("Exception SendRtcpSenderReport. " + excp.Message);
}
}
/// <summary>
/// Creates a new RTSP session and intialises the RTP and control sockets for the session.
/// </summary>
/// <param name="remoteEndPoint">The remote end point of the RTSP client that requested the RTSP session be set up.</param>
/// <returns>An RTSP session object.</returns>
public RTSPSession CreateRTSPSession(IPEndPoint remoteEndPoint, IPEndPoint rtcpRemoteEndPoint)
{
var rtspSession = new RTSPSession(Guid.NewGuid().ToString(), remoteEndPoint, rtcpRemoteEndPoint);
rtspSession.ReservePorts();
rtspSession.OnRTPSocketDisconnected += RTPSocketDisconnected;
lock (m_rtspSessions)
{
m_rtspSessions.Add(rtspSession.SessionID, rtspSession);
}
return(rtspSession);
}
public void Send(byte[] buffer)
{
try
{
Peer.LastTimestamp = (Peer.LastTimestamp == 0) ? RTSPSession.DateTimeToNptTimestamp32(DateTime.Now) : Peer.LastTimestamp + TIMESTAMP_SPACING;
for (int index = 0; index *RTP_MAX_PAYLOAD < buffer.Length; index++)
{
int offset = (index == 0) ? 0 : (index * RTP_MAX_PAYLOAD);
int payloadLength = (offset + RTP_MAX_PAYLOAD < buffer.Length) ? RTP_MAX_PAYLOAD : buffer.Length - offset;
byte[] vp8HeaderBytes = (index == 0) ? new byte[] { 0x10 } : new byte[] { 0x00 };
RTPPacket rtpPacket = new RTPPacket(payloadLength + SRTP_AUTH_KEY_LENGTH + vp8HeaderBytes.Length);
rtpPacket.Header.SyncSource = Peer.SSRC;
rtpPacket.Header.SequenceNumber = Peer.SequenceNumber++;
rtpPacket.Header.Timestamp = Peer.LastTimestamp;
rtpPacket.Header.MarkerBit = ((offset + payloadLength) >= buffer.Length) ? 1 : 0; // Set marker bit for the last packet in the frame.
rtpPacket.Header.PayloadType = PAYLOAD_TYPE_ID;
Buffer.BlockCopy(vp8HeaderBytes, 0, rtpPacket.Payload, 0, vp8HeaderBytes.Length);
Buffer.BlockCopy(buffer, offset, rtpPacket.Payload, vp8HeaderBytes.Length, payloadLength);
var rtpBuffer = rtpPacket.GetBytes();
int rtperr = SrtpContext.ProtectRTP(rtpBuffer, rtpBuffer.Length - SRTP_AUTH_KEY_LENGTH);
if (rtperr != 0)
{
logger.Warn("SRTP packet protection failed, result " + rtperr + ".");
}
else
{
var connectedIceCandidate = Peer.LocalIceCandidates.Where(y => y.RemoteRtpEndPoint != null).First();
connectedIceCandidate.LocalRtpSocket.SendTo(rtpBuffer, connectedIceCandidate.RemoteRtpEndPoint);
}
}
}
catch (Exception sendExcp)
{
// logger.Error("SendRTP exception sending to " + client.SocketAddress + ". " + sendExcp.Message);
}
}
/// <summary>
/// Periodically checks the established connections and closes any that have not had a transmission for a specified
/// period or where the number of connections allowed per IP address has been exceeded.
/// </summary>
private void PruneConnections(string threadName)
{
try
{
Thread.CurrentThread.Name = threadName;
Thread.Sleep(INITIALPRUNE_CONNECTIONS_DELAY);
while (!Closed)
{
// Check the TCP connections established by RTSP clients for any inactive ones.
try
{
RTSPConnection inactiveConnection = null;
lock (m_connectedSockets)
{
var inactiveConnectionQuery = from connection in m_connectedSockets
where connection.Value.LastTransmission < DateTime.Now.AddMinutes(PRUNE_NOTRANSMISSION_MINUTES * -1)
select connection.Key;
var inactiveConnectionKey = inactiveConnectionQuery.FirstOrDefault();
while (inactiveConnectionKey != null)
{
if (inactiveConnectionKey != null)
{
inactiveConnection = m_connectedSockets[inactiveConnectionKey];
m_connectedSockets.Remove(inactiveConnectionKey);
logger.Debug("Pruning inactive RTSP connection on to remote end point " + inactiveConnection.RemoteEndPoint + ".");
inactiveConnection.Close();
}
inactiveConnectionKey = inactiveConnectionQuery.FirstOrDefault();
}
}
}
catch (SocketException)
{
// Will be thrown if the socket is already closed.
}
catch (Exception pruneExcp)
{
logger.Error("Exception RTSPServer PruneConnections (pruning). " + pruneExcp.Message);
}
// Check the list of active RTSP sessions for any that have stopped communicating or that have closed.
try
{
RTSPSession inactiveSession = null;
lock (m_rtspSessions)
{
var inactiveSessionQuery = from session in m_rtspSessions
where (session.Value.DontTimeout == false &&
session.Value.RTPLastActivityAt < DateTime.Now.AddSeconds(CLOSE_RTSP_SESSION_NO_DATA_SECONDS * -1) &&
session.Value.ControlLastActivityAt < DateTime.Now.AddSeconds(CLOSE_RTSP_SESSION_NO_DATA_SECONDS * -1) &&
session.Value.StartedAt < DateTime.Now.AddSeconds(CLOSE_RTSP_SESSION_NO_DATA_SECONDS * -1) &&
session.Value.CreatedAt < DateTime.Now.AddSeconds(CLOSE_RTSP_SESSION_NO_DATA_SECONDS * -1)) ||
session.Value.IsClosed
select session.Key;
var inactiveSessionKey = inactiveSessionQuery.FirstOrDefault();
while (inactiveSessionKey != null)
{
inactiveSession = m_rtspSessions[inactiveSessionKey];
m_rtspSessions.Remove(inactiveSessionKey);
if (!inactiveSession.IsClosed)
{
logger.Debug("Closing inactive RTSP session for session ID " + inactiveSession.SessionID + " established from RTSP client on " + inactiveSession.RemoteEndPoint + " (started at " + inactiveSession.StartedAt + ", RTP last activity at " + inactiveSession.RTPLastActivityAt + ", control last activity at " + inactiveSession.ControlLastActivityAt + ", is closed " + inactiveSession.IsClosed + ").");
inactiveSession.Close();
}
inactiveSessionKey = inactiveSessionQuery.FirstOrDefault();
}
}
}
catch (Exception rtspSessExcp)
{
logger.Error("Exception RTSPServer checking for inactive RTSP sessions. " + rtspSessExcp);
}
Thread.Sleep(PRUNE_CONNECTIONS_INTERVAL * 1000);
}
logger.Debug("RTSPServer socket on " + m_localIPEndPoint.ToString() + " pruning connections halted.");
}
catch (Exception excp)
{
logger.Error("Exception RTSPServer PruneConnections. " + excp.Message);
}
}
public void Start(string url)
{
_url = url;
Match urlMatch = Regex.Match(url, @"rtsp://(?<hostname>\S+?)/", RegexOptions.IgnoreCase);
if (!urlMatch.Success)
{
throw new ApplicationException("The URL provided to the RTSP client was not recognised, " + url + ".");
}
else
{
string hostname = urlMatch.Result("${hostname}");
int port = RTSP_PORT;
if (hostname.Contains(':'))
{
port = SIPSorcery.Sys.IPSocket.ParsePortFromSocket(hostname);
hostname = SIPSorcery.Sys.IPSocket.ParseHostFromSocket(hostname);
}
logger.LogDebug("RTSP client connecting to " + hostname + ", port " + port + ".");
_rtspConnection = new TcpClient(hostname, port);
_rtspStream = _rtspConnection.GetStream();
_rtspSession = new RTSPSession();
_rtspSession.RTPPayloadHeaderLength = _rtpPayloadHeaderLength;
_rtspSession.ReservePorts();
_rtspSession.OnRTPQueueFull += RTPQueueFull;
RTSPRequest rtspRequest = new RTSPRequest(RTSPMethodsEnum.SETUP, url);
RTSPHeader rtspHeader = new RTSPHeader(_cseq++, null);
rtspHeader.Transport = new RTSPTransportHeader()
{
ClientRTPPortRange = _rtspSession.RTPPort + "-" + _rtspSession.ControlPort
};
rtspRequest.Header = rtspHeader;
string rtspReqStr = rtspRequest.ToString();
RTSPMessage rtspMessage = null;
System.Diagnostics.Debug.WriteLine(rtspReqStr);
byte[] rtspRequestBuffer = Encoding.UTF8.GetBytes(rtspReqStr);
_rtspStream.Write(rtspRequestBuffer, 0, rtspRequestBuffer.Length);
byte[] buffer = new byte[2048];
int bytesRead = _rtspStream.Read(buffer, 0, 2048);
if (bytesRead > 0)
{
System.Diagnostics.Debug.WriteLine(Encoding.UTF8.GetString(buffer, 0, bytesRead));
rtspMessage = RTSPMessage.ParseRTSPMessage(buffer, null, null);
if (rtspMessage.RTSPMessageType == RTSPMessageTypesEnum.Response)
{
var setupResponse = RTSPResponse.ParseRTSPResponse(rtspMessage);
if (setupResponse.Status == RTSPResponseStatusCodesEnum.OK)
{
_rtspSession.SessionID = setupResponse.Header.Session;
_rtspSession.RemoteEndPoint = new IPEndPoint((_rtspConnection.Client.RemoteEndPoint as IPEndPoint).Address, setupResponse.Header.Transport.GetServerRTPPort());
_rtspSession.Start();
logger.LogDebug("RTSP Response received to SETUP: " + setupResponse.Status + ", session ID " + _rtspSession.SessionID + ", server RTP endpoint " + _rtspSession.RemoteEndPoint + ".");
if (OnSetupSuccess != null)
{
OnSetupSuccess(this);
}
}
else
{
logger.LogWarning("RTSP Response received to SETUP: " + setupResponse.Status + ".");
throw new ApplicationException("An error response of " + setupResponse.Status + " was received for an RTSP setup request.");
}
}
}
else
{
throw new ApplicationException("Zero bytes were read from the RTSP client socket in response to a SETUP request.");
}
}
}