/// <summary>
/// Sends the RTSP teardown request for an existing RTSP session.
/// </summary>
private void Teardown()
{
try
{
if (_rtspStream != null && _rtspConnection.Connected)
{
logger.Debug("RTSP client sending teardown request for " + _url + ".");
RTSPRequest teardownRequest = new RTSPRequest(RTSPMethodsEnum.TEARDOWN, _url);
RTSPHeader teardownHeader = new RTSPHeader(_cseq++, _rtspSession.SessionID);
teardownRequest.Header = teardownHeader;
System.Diagnostics.Debug.WriteLine(teardownRequest.ToString());
var buffer = Encoding.UTF8.GetBytes(teardownRequest.ToString());
_rtspStream.Write(buffer, 0, buffer.Length);
}
else
{
logger.Debug("RTSP client did not send teardown request for " + _url + ", the socket was closed.");
}
}
catch (Exception excp)
{
logger.Error("Exception RTSPClient.Teardown. " + excp);
}
}
public string GetStreamDescription(string url)
{
try
{
string hostname = Regex.Match(url, @"rtsp://(?<hostname>\S+?)/").Result("${hostname}");
//IPEndPoint rtspEndPoint = DNSResolver.R(hostname, DNS_RESOLUTION_TIMEOUT);
logger.Debug("RTSP Client Connecting to " + hostname + ".");
TcpClient rtspSocket = new TcpClient(hostname, RTSP_PORT);
NetworkStream rtspStream = rtspSocket.GetStream();
string rtspSDP = null;
RTSPRequest rtspRequest = new RTSPRequest(RTSPMethodsEnum.DESCRIBE, url);
RTSPHeader rtspHeader = new RTSPHeader(1, null);
rtspRequest.Header = rtspHeader;
string rtspReqStr = rtspRequest.ToString();
RTSPMessage rtspMessage = null;
RTSPResponse rtspResponse = null;
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)
{
logger.Debug(Encoding.UTF8.GetString(buffer, 0, bytesRead));
byte[] msgBuffer = new byte[bytesRead];
Buffer.BlockCopy(buffer, 0, msgBuffer, 0, bytesRead);
rtspMessage = RTSPMessage.ParseRTSPMessage(msgBuffer, null, null);
if (rtspMessage.RTSPMessageType == RTSPMessageTypesEnum.Response)
{
rtspResponse = RTSPResponse.ParseRTSPResponse(rtspMessage);
logger.Debug("RTSP Response received: " + rtspResponse.StatusCode + " " + rtspResponse.Status + " " + rtspResponse.ReasonPhrase + ".");
}
rtspSDP = rtspResponse.Body;
}
else
{
logger.Warn("Socket closed prematurely in GetStreamDescription for " + url + ".");
}
rtspSocket.Close();
return(rtspSDP);
}
catch (Exception excp)
{
logger.Error("Exception GetStreamDescription. " + excp.Message);
throw excp;
}
}
/// <summary>
/// Sends a keep-alive packet to keep the RTSP RTP connection from being shut.
/// </summary>
private void SendKeepAlives()
{
try
{
Thread.CurrentThread.Name = "rtspclient-keepalive";
// Set the initial pause as half the keep-alive interval.
Thread.Sleep(RTP_KEEP_ALIVE_INTERVAL * 500);
while (!_isClosed)
{
_rtspSession.SendRTPRaw(new byte[] { 0x00, 0x00, 0x00, 0x00 });
// Also send an OPTIONS request on the RTSP connection to prevent the remote server from timing it out.
RTSPRequest optionsRequest = new RTSPRequest(RTSPMethodsEnum.OPTIONS, _url);
RTSPHeader optionsHeader = new RTSPHeader(_cseq++, _rtspSession.SessionID);
optionsRequest.Header = optionsHeader;
System.Diagnostics.Debug.WriteLine(optionsRequest.ToString());
var rtspRequestBuffer = Encoding.UTF8.GetBytes(optionsRequest.ToString());
_rtspStream.Write(rtspRequestBuffer, 0, rtspRequestBuffer.Length);
var buffer = new byte[2048];
var bytesRead = _rtspStream.Read(buffer, 0, 2048);
if (bytesRead > 0)
{
System.Diagnostics.Debug.WriteLine(Encoding.UTF8.GetString(buffer, 0, bytesRead));
var rtspMessage = RTSPMessage.ParseRTSPMessage(buffer, null, null);
if (rtspMessage.RTSPMessageType == RTSPMessageTypesEnum.Response)
{
var optionsResponse = RTSPResponse.ParseRTSPResponse(rtspMessage);
//logger.Debug("RTSP Response received for OPTIONS keep-alive request: " + optionsResponse.StatusCode + " " + optionsResponse.Status + " " + optionsResponse.ReasonPhrase + ".");
}
}
else
{
logger.Warn("Zero bytes were read from the RTSP client socket in response to an OPTIONS keep-alive request.");
}
_sendKeepAlivesMRE.Reset();
_sendKeepAlivesMRE.WaitOne(RTP_KEEP_ALIVE_INTERVAL * 1000);
}
}
catch (Exception excp)
{
logger.Error("Exception RTSPClient.SendKeepAlives. " + excp);
}
}
public static RTSPRequest ParseRTSPRequest(RTSPMessage rtspMessage, out RTSPRequestParserError requestParserError)
{
requestParserError = RTSPRequestParserError.None;
string urlStr = null;
try
{
var rtspRequest = new RTSPRequest();
string statusLine = rtspMessage.FirstLine;
int firstSpacePosn = statusLine.IndexOf(" ", StringComparison.OrdinalIgnoreCase);
string method = statusLine.Substring(0, firstSpacePosn).Trim();
rtspRequest.Method = RTSPMethods.GetMethod(method);
if (rtspRequest.Method == RTSPMethodsEnum.UNKNOWN)
{
rtspRequest.UnknownMethod = method;
logger.Warn("Unknown RTSP method received " + rtspRequest.Method + ".");
}
statusLine = statusLine.Substring(firstSpacePosn).Trim();
int secondSpacePosn = statusLine.IndexOf(" ");
if (secondSpacePosn != -1)
{
urlStr = statusLine.Substring(0, secondSpacePosn);
rtspRequest.URL = RTSPURL.ParseRTSPURL(urlStr);
rtspRequest.RTSPVersion = statusLine.Substring(secondSpacePosn, statusLine.Length - secondSpacePosn).Trim();
rtspRequest.Header = (rtspMessage.RTSPHeaders != null) ? RTSPHeader.ParseRTSPHeaders(rtspMessage.RTSPHeaders) : new RTSPHeader(0, null);
rtspRequest.Body = rtspMessage.Body;
return(rtspRequest);
}
else
{
throw new ApplicationException("URI was missing on RTSP request.");
}
}
catch (Exception excp)
{
logger.Error("Exception parsing RTSP request. URI, " + urlStr + ".");
throw new ApplicationException("There was an exception parsing an RTSP request. " + excp.Message);
}
}
/// <summary>
/// Send a PLAY request to the RTSP server to commence the media stream.
/// </summary>
public void Play()
{
ThreadPool.QueueUserWorkItem(delegate { ProcessRTPPackets(); });
ThreadPool.QueueUserWorkItem(delegate { SendKeepAlives(); });
RTSPRequest playRequest = new RTSPRequest(RTSPMethodsEnum.PLAY, _url);
RTSPHeader playHeader = new RTSPHeader(_cseq++, _rtspSession.SessionID);
playRequest.Header = playHeader;
System.Diagnostics.Debug.WriteLine(playRequest.ToString());
var rtspRequestBuffer = Encoding.UTF8.GetBytes(playRequest.ToString());
_rtspStream.Write(rtspRequestBuffer, 0, rtspRequestBuffer.Length);
var buffer = new byte[2048];
var bytesRead = _rtspStream.Read(buffer, 0, 2048);
if (bytesRead > 0)
{
System.Diagnostics.Debug.WriteLine(Encoding.UTF8.GetString(buffer, 0, bytesRead));
var rtspMessage = RTSPMessage.ParseRTSPMessage(buffer, null, null);
if (rtspMessage.RTSPMessageType == RTSPMessageTypesEnum.Response)
{
var playResponse = RTSPResponse.ParseRTSPResponse(rtspMessage);
logger.Debug("RTSP Response received to PLAY: " + playResponse.StatusCode + " " + playResponse.Status + " " + playResponse.ReasonPhrase + ".");
}
}
else
{
throw new ApplicationException("Zero bytes were read from the RTSP client socket in response to a PLAY request.");
}
}
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 = GB28181.SIPSorcery.Sys.IPSocket.ParsePortFromSocket(hostname);
hostname = GB28181.SIPSorcery.Sys.IPSocket.ParseHostFromSocket(hostname);
}
logger.Debug("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.Debug("RTSP Response received to SETUP: " + setupResponse.Status + ", session ID " + _rtspSession.SessionID + ", server RTP endpoint " + _rtspSession.RemoteEndPoint + ".");
if (OnSetupSuccess != null)
{
OnSetupSuccess(this);
}
}
else
{
logger.Warn("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.");
}
}
}