public static RTSPResponse ParseRTSPResponse(RTSPMessage rtspMessage,
out RTSPResponseParserError responseParserError)
{
responseParserError = RTSPResponseParserError.None;
try
{
RTSPResponse rtspResponse = new RTSPResponse();
string statusLine = rtspMessage.FirstLine;
int firstSpacePosn = statusLine.IndexOf(" ");
rtspResponse.RTSPVersion = statusLine.Substring(0, firstSpacePosn).Trim();
statusLine = statusLine.Substring(firstSpacePosn).Trim();
rtspResponse.StatusCode = Convert.ToInt32(statusLine.Substring(0, 3));
rtspResponse.Status = RTSPResponseStatusCodes.GetStatusTypeForCode(rtspResponse.StatusCode);
rtspResponse.ReasonPhrase = statusLine.Substring(3).Trim();
rtspResponse.Header = RTSPHeader.ParseRTSPHeaders(rtspMessage.RTSPHeaders);
rtspResponse.Body = rtspMessage.Body;
//rtspResponse.Valid = rtspResponse.Validate(out sipResponse.ValidationError);
return(rtspResponse);
}
catch (Exception excp)
{
logger.Error("Exception parsing RTSP reqsponse. " + excp.Message);
throw new ApplicationException("There was an exception parsing an RTSP response. " + excp.Message);
}
}
public static RTSPMessage ParseRTSPMessage(string message, IPEndPoint receivedFrom, IPEndPoint receivedOn)
{
try
{
RTSPMessage rtspMessage = new RTSPMessage();
rtspMessage.ReceivedAt = DateTime.Now;
rtspMessage.ReceivedFrom = receivedFrom;
rtspMessage.ReceivedOn = receivedOn;
rtspMessage.RawMessage = message;
int endFistLinePosn = message.IndexOf(m_CRLF);
if (endFistLinePosn != -1)
{
rtspMessage.FirstLine = message.Substring(0, endFistLinePosn);
if (rtspMessage.FirstLine.Substring(0, RTSP_RESPONSE_PREFIX.Length) == RTSP_RESPONSE_PREFIX)
{
rtspMessage.RTSPMessageType = RTSPMessageTypesEnum.Response;
}
else
{
rtspMessage.RTSPMessageType = RTSPMessageTypesEnum.Request;
}
int endHeaderPosn = message.IndexOf(m_CRLF + m_CRLF);
if (endHeaderPosn == -1)
{
// Assume flakey implementation if message does not contain the required CRLFCRLF sequence and treat the message as having no body.
string headerString =
message.Substring(endFistLinePosn + 2, message.Length - endFistLinePosn - 2);
rtspMessage.RTSPHeaders = RTSPHeader.SplitHeaders(headerString);
}
else if (endHeaderPosn > endFistLinePosn + 2)
{
string headerString =
message.Substring(endFistLinePosn + 2, endHeaderPosn - endFistLinePosn - 2);
rtspMessage.RTSPHeaders = RTSPHeader.SplitHeaders(headerString);
if (message.Length > endHeaderPosn + 4)
{
rtspMessage.Body = message.Substring(endHeaderPosn + 4);
}
}
return(rtspMessage);
}
else
{
logger.Error(
"Error ParseRTSPMessage, there were no end of line characters in the string being parsed.");
return(null);
}
}
catch (Exception excp)
{
logger.Error("Exception ParseRTSPMessage. " + excp.Message + "\nRTSP Message=" + message + ".");
return(null);
}
}
/// <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 string GetStreamDescription(string url)
{
try
{
string hostname = Regex.Match(url, @"rtsp://(?<hostname>\S+?)/").Result("${hostname}");
//IPEndPoint rtspEndPoint = DNSResolver.R(hostname, DNS_RESOLUTION_TIMEOUT);
Logger.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.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.Logger.Debug("RTSP Response received: " + rtspResponse.StatusCode + " " +
rtspResponse.Status +
" " + rtspResponse.ReasonPhrase + ".");
}
rtspSDP = rtspResponse.Body;
}
else
{
Logger.Logger.Warn("Socket closed prematurely in GetStreamDescription for " + url + ".");
}
rtspSocket.Close();
return(rtspSDP);
}
catch (Exception excp)
{
Logger.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;
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)
{
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.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.Logger.Error("Exception parsing RTSP request. URI, " + urlStr + ".");
throw new ApplicationException("There was an exception parsing an RTSP request. " + excp.Message);
}
}
public static RTSPMessage ParseRTSPMessage(byte[] buffer, IPEndPoint receivedFrom, IPEndPoint receivedOn)
{
string message = null;
try
{
if (buffer == null || buffer.Length < m_minFirstLineLength)
{
// Ignore.
return(null);
}
else if (buffer.Length > RTSPConstants.RTSP_MAXIMUM_LENGTH)
{
Logger.Logger.Error(
"RTSP message received that exceeded the maximum allowed message length, ignoring.");
return(null);
}
else if (!ByteBufferInfo.HasString(buffer, 0, buffer.Length, RTSP_MESSAGE_IDENTIFIER, m_CRLF))
{
// Message does not contain "RTSP" anywhrere on the first line, ignore.
return(null);
}
else
{
message = Encoding.UTF8.GetString(buffer);
RTSPMessage rtspMessage = ParseRTSPMessage(message, receivedFrom, receivedOn);
rtspMessage.RawBuffer = buffer;
return(rtspMessage);
}
}
catch (Exception excp)
{
message = message.Replace("\n", "LF");
message = message.Replace("\r", "CR");
Logger.Logger.Error("Exception ParseRTSPMessage. ->" + excp.Message + "->RTSP Message=" + message +
".");
return(null);
}
}
public static RTSPRequest ParseRTSPRequest(RTSPMessage rtspMessage)
{
RTSPRequestParserError dontCare = RTSPRequestParserError.None;
return(ParseRTSPRequest(rtspMessage, out dontCare));
}
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 = IPSocket.ParsePortFromSocket(hostname);
hostname = 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;
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)
{
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.");
}
}
}
public static RTSPResponse ParseRTSPResponse(RTSPMessage rtspMessage)
{
RTSPResponseParserError dontCare = RTSPResponseParserError.None;
return(ParseRTSPResponse(rtspMessage, out dontCare));
}
