/// <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);
}
}
/// <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;
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)
{
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 = 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.");
}
}
}
