/// <summary>
/// Gets the Rtsp request.
/// </summary>
/// <param name="aRequestParts">A request parts.</param>
/// <returns>the parsed request</returns>
internal static RtspMessage GetRtspRequest(string[] aRequestParts)
{
// <pex>
Debug.Assert(aRequestParts != (string[])null, "aRequestParts");
Debug.Assert(aRequestParts.Length != 0, "aRequestParts.Length == 0");
// </pex>
// we already know this is a Request
RtspRequest returnValue;
switch (ParseRequest(aRequestParts[0]))
{
case RequestType.OPTIONS:
returnValue = new RtspRequestOptions();
break;
case RequestType.SETUP:
returnValue = new RtspRequestSetup();
break;
case RequestType.PLAY:
returnValue = new RtspRequestPlay();
break;
/*
* case RequestType.DESCRIBE:
* break;
* case RequestType.ANNOUNCE:
* break;
* case RequestType.GET_PARAMETER:
* break;
*
* case RequestType.PAUSE:
* break;
*
* case RequestType.RECORD:
* break;
* case RequestType.REDIRECT:
* break;
*
* case RequestType.SET_PARAMETER:
* break;
* case RequestType.TEARDOWN:
* break;
*/
case RequestType.UNKNOWN:
default:
returnValue = new RtspRequest();
break;
}
return(returnValue);
}
/// <summary>
/// Handles a request setup.
/// </summary>
/// <param name="destination">The destination.</param>
/// <param name="requestSetup">The request setup.</param>
/// <returns>The rewritten message</returns>
/// <remarks>
/// The destination can be modified.
/// </remarks>
private RtspMessage HandleRequestSetup(ref RtspListener destination, RtspRequestSetup requestSetup)
{
Contract.Requires(requestSetup != null);
Contract.Requires(destination != null);
Contract.Ensures(Contract.Result<RtspMessage>() != null);
Contract.Ensures(Contract.ValueAtReturn(out destination) != null);
// look if we already have a multicast streaming playing for this URI.
foreach (var session in _activesSession.Values)
{
if (session.State == RtspSession.SessionState.Playing && session.ListOfForwader.ContainsKey(requestSetup.RtspUri))
{
Forwarder existingForwarder = session.ListOfForwader[requestSetup.RtspUri];
if (existingForwarder != null && existingForwarder.ToMulticast)
{
RtspResponse returnValue = requestSetup.CreateResponse();
returnValue.Headers[RtspHeaderNames.Transport] = new RtspTransport()
{
IsMulticast = true,
Destination = existingForwarder.ForwardHostVideo,
Port = new PortCouple(existingForwarder.ForwardPortVideo, existingForwarder.ListenCommandPort),
}.ToString();
returnValue.Session = session.Name;
destination = requestSetup.SourcePort;
return returnValue;
}
}
}
string setupKey = requestSetup.SourcePort.RemoteAdress + "SEQ" + requestSetup.CSeq.ToString(CultureInfo.InvariantCulture);
RtspTransport selectedTransport = SelectTransport(requestSetup);
// We do not handle asked transport so return directly.
if (selectedTransport == null)
{
_logger.Info("No transport asked are supported, sorry");
RtspResponse returnValue = requestSetup.CreateResponse();
// Unsupported transport;
returnValue.ReturnCode = 461;
destination = requestSetup.SourcePort;
return returnValue;
}
UDPForwarder forwarder = new UDPForwarder();
forwarder.ToMulticast = selectedTransport.IsMulticast;
// this part of config is only valid in unicast.
if (!selectedTransport.IsMulticast)
{
forwarder.ForwardPortVideo = selectedTransport.ClientPort.First;
forwarder.SourcePortCommand = selectedTransport.ClientPort.Second;
// If the client did not set the destination.. get it from TCP source
if (!string.IsNullOrEmpty(selectedTransport.Destination))
{
forwarder.ForwardHostVideo = selectedTransport.Destination;
}
else
{
forwarder.ForwardHostVideo = requestSetup.SourcePort.RemoteAdress.Split(':')[0];
_logger.Debug("Destination get from TCP port {0}", forwarder.ForwardHostVideo);
}
}
// Configured the transport asked.
forwarder.ForwardHostCommand = destination.RemoteAdress.Split(':')[0];
RtspTransport firstNewTransport = new RtspTransport()
{
IsMulticast = false,
ClientPort = new PortCouple(forwarder.ListenVideoPort, forwarder.FromForwardCommandPort),
};
RtspTransport secondTransport = new RtspTransport()
{
IsMulticast = false,
LowerTransport = RtspTransport.LowerTransportType.TCP,
};
requestSetup.Headers[RtspHeaderNames.Transport] = firstNewTransport.ToString() + ", " + secondTransport.ToString();
_setupForwarder.Add(setupKey, forwarder);
return requestSetup;
}
/// <summary>
/// Selects the transport based on the configuration of the system..
/// </summary>
/// <param name="requestSetup">The request setup message.</param>
/// <returns>The selected transport</returns>
/// <remarks>
/// The transport is selected by taking the first supported transport
/// in order of appearence.
/// </remarks>
private static RtspTransport SelectTransport(RtspRequestSetup requestSetup)
{
RtspTransport selectedTransport = null;
const bool acceptTCP = false;
const bool acceptUDPUnicast = true;
const bool acceptUDPMulticast = true;
foreach (RtspTransport proposedTransport in requestSetup.GetTransports())
{
if (acceptTCP && proposedTransport.LowerTransport == RtspTransport.LowerTransportType.TCP)
{
selectedTransport = proposedTransport;
break;
}
if (acceptUDPMulticast && proposedTransport.LowerTransport == RtspTransport.LowerTransportType.UDP
&& proposedTransport.IsMulticast)
{
selectedTransport = proposedTransport;
break;
}
if (acceptUDPUnicast && proposedTransport.LowerTransport == RtspTransport.LowerTransportType.UDP
&& !proposedTransport.IsMulticast)
{
selectedTransport = proposedTransport;
break;
}
}
return selectedTransport;
}
/// <summary>
/// Gets the Rtsp request.
/// </summary>
/// <param name="aRequestParts">A request parts.</param>
/// <returns>the parsed request</returns>
internal static RtspMessage GetRtspRequest(string[] aRequestParts, ILogger logger)
{
// <pex>
Debug.Assert(aRequestParts != (string[])null, "aRequestParts");
Debug.Assert(aRequestParts.Length != 0, "aRequestParts.Length == 0");
// </pex>
// we already know this is a Request
RtspRequest returnValue;
switch (ParseRequest(aRequestParts[0]))
{
case RequestType.OPTIONS:
returnValue = new RtspRequestOptions(logger);
break;
case RequestType.DESCRIBE:
returnValue = new RtspRequestDescribe(logger);
break;
case RequestType.SETUP:
returnValue = new RtspRequestSetup(logger);
break;
case RequestType.PLAY:
returnValue = new RtspRequestPlay(logger);
break;
case RequestType.PAUSE:
returnValue = new RtspRequestPause(logger);
break;
case RequestType.TEARDOWN:
returnValue = new RtspRequestTeardown(logger);
break;
case RequestType.GET_PARAMETER:
returnValue = new RtspRequestGetParameter(logger);
break;
case RequestType.ANNOUNCE:
returnValue = new RtspRequestAnnounce(logger);
break;
case RequestType.RECORD:
returnValue = new RtspRequestRecord(logger);
break;
/*
* case RequestType.REDIRECT:
* break;
*
* case RequestType.SET_PARAMETER:
* break;
*/
case RequestType.UNKNOWN:
default:
returnValue = new RtspRequest(logger);
break;
}
return(returnValue);
}
/// <summary>
/// Gets the Rtsp request.
/// </summary>
/// <param name="aRequestParts">A request parts.</param>
/// <returns>the parsed request</returns>
internal static RtspMessage GetRtspRequest(string[] aRequestParts)
{
// <pex>
Debug.Assert(aRequestParts != (string[])null, "aRequestParts");
Debug.Assert(aRequestParts.Length != 0, "aRequestParts.Length == 0");
// </pex>
// we already know this is a Request
RtspRequest returnValue;
switch (ParseRequest(aRequestParts[0]))
{
case RequestType.OPTIONS:
returnValue = new RtspRequestOptions();
break;
case RequestType.SETUP:
returnValue = new RtspRequestSetup();
break;
case RequestType.PLAY:
returnValue = new RtspRequestPlay();
break;
/*
case RequestType.DESCRIBE:
break;
case RequestType.ANNOUNCE:
break;
case RequestType.GET_PARAMETER:
break;
case RequestType.PAUSE:
break;
case RequestType.RECORD:
break;
case RequestType.REDIRECT:
break;
case RequestType.SET_PARAMETER:
break;
case RequestType.TEARDOWN:
break;
*/
case RequestType.UNKNOWN:
default:
returnValue = new RtspRequest();
break;
}
return returnValue;
}
// RTSP Messages are OPTIONS, DESCRIBE, SETUP, PLAY etc
private void Rtsp_MessageReceived(object sender, Rtsp.RtspChunkEventArgs e)
{
Rtsp.Messages.RtspResponse message = e.Message as Rtsp.Messages.RtspResponse;
Console.WriteLine("Received " + message.OriginalRequest.ToString());
// Check if the Message has an Authenticate header and what type it is
if (message.Headers.ContainsKey(RtspHeaderNames.WWWAuthenticate))
{
String www_authenticate = message.Headers[RtspHeaderNames.WWWAuthenticate];
// Parse www_authenticate
// EG: WWW-Authenticate: Basic realm="xxxxxxx"
// EG: WWW-Authenticate: Digest realm="AXIS_WS_ACCC8E3A0A8F", nonce="000057c3Y810622bff50b36005eb5efeae118626a161bf", stale=FALSE
string[] items = www_authenticate.Split(new char[] { ',', ' ' }); // split on Comma and Space
// Process the first item
if (items.Count() >= 1 && items[0].Equals("Basic"))
{
authentication = AUTHENTICATION.BASIC;
}
else if (items.Count() >= 1 && items[0].Equals("Digest"))
{
authentication = AUTHENTICATION.DIGEST;
}
// Process the remaining items
for (int i = 1; i < items.Count(); i++)
{
string[] parts = items[i].Split(new char[] { '=' }); // Split on Equals
if (parts.Count() >= 2 && parts[0].Trim().Equals("realm"))
{
realm = parts[1].Trim(new char[] { ' ', '\"' }); // trim space and quotes
}
else if (parts.Count() >= 2 && parts[0].Trim().Equals("nonce"))
{
nonce = parts[1].Trim(new char[] { ' ', '\"' }); // trim space and quotes
}
}
}
// If we get a reply to OPTIONS and CSEQ is 1 (which was our first command), then send the DESCRIBE
// If we fer a reply to OPTIONS and CSEQ is not 1, it must have been a keepalive command
if (message.OriginalRequest != null && message.OriginalRequest is Rtsp.Messages.RtspRequestOptions)
{
if (message.CSeq == 1)
{
// Start a Timer to send an OPTIONS command (for keepalive) every 20 seconds
keepalive_timer = new System.Timers.Timer();
keepalive_timer.Elapsed += Timer_Elapsed;
keepalive_timer.Interval = 20 * 1000;
keepalive_timer.Enabled = true;
// send the DESCRIBE. First time around we have no WWW-Authorise
Rtsp.Messages.RtspRequest describe_message = new Rtsp.Messages.RtspRequestDescribe();
describe_message.RtspUri = new Uri(url);
rtsp_client.SendMessage(describe_message);
}
else
{
// do nothing
}
}
// If we get a reply to DESCRIBE (which was our second command), then prosess SDP and send the SETUP
if (message.OriginalRequest != null && message.OriginalRequest is Rtsp.Messages.RtspRequestDescribe)
{
// Got a reply for DESCRIBE
// First time we send DESCRIBE we do not add any authorization (and we could not add it even if we wanted to
// as we will not have the authorization Nonce value required for Digest mode
// So we have to handle the Unauthorized 401 error here and send a new DESCRIBE message
if (message.IsOk == false)
{
Console.WriteLine("Got Error in DESCRIBE Reply " + message.ReturnCode + " " + message.ReturnMessage);
if (message.ReturnCode == 401 && (message.OriginalRequest.Headers.ContainsKey(RtspHeaderNames.Authorization) == false))
{
// Error 401 - Unauthorized, but the original request did not use Authorization so try again with Authorization added
if (username == null || password == null)
{
// we do nothave a username or password. Abort
return;
}
// Send a new DESCRIBE with authorization
Rtsp.Messages.RtspRequest describe_message = new Rtsp.Messages.RtspRequestDescribe();
describe_message.RtspUri = new Uri(url);
if (authentication != AUTHENTICATION.NONE)
{
String authorization_string = GenerateAuthorization(username, password, authentication,
realm, nonce, url, "DESCRIBE");
if (authorization_string != null)
{
describe_message.Headers.Add("Authorization", authorization_string);
}
}
rtsp_client.SendMessage(describe_message);
return;
}
else if (message.ReturnCode == 401 && (message.OriginalRequest.Headers.ContainsKey(RtspHeaderNames.Authorization) == true))
{
// Authorization failed
return;
}
else
{
// some other error
return;
}
}
// Examine the SDP
Console.Write(System.Text.Encoding.UTF8.GetString(message.Data));
Rtsp.Sdp.SdpFile sdp_data;
using (StreamReader sdp_stream = new StreamReader(new MemoryStream(message.Data)))
{
sdp_data = Rtsp.Sdp.SdpFile.Read(sdp_stream);
}
// Process each 'Media' Attribute in the SDP (each sub-stream)
// If the attribute is for Video, then carry out a SETUP and a PLAY
// Only do this for the first Video attribute in case there is more than one in the SDP
for (int x = 0; x < sdp_data.Medias.Count; x++)
{
if (sdp_data.Medias[x].MediaType == Rtsp.Sdp.Media.MediaTypes.video)
{
// We only want the first video sub-stream
if (video_payload == -1)
{
video_payload = sdp_data.Medias[x].PayloadType;
// search the attributes for control, fmtp and rtpmap
String control = ""; // the "track" or "stream id"
Rtsp.Sdp.AttributFmtp fmtp = null; // holds SPS and PPS in base64 (h264)
Rtsp.Sdp.AttributRtpMap rtpmap = null; // custom payload (>=96) details
foreach (Rtsp.Sdp.Attribut attrib in sdp_data.Medias[x].Attributs)
{
if (attrib.Key.Equals("control"))
{
String sdp_control = attrib.Value;
if (sdp_control.ToLower().StartsWith("rtsp://"))
{
control = sdp_control; //absolute path
}
else
{
control = url + "/" + sdp_control; // relative path
}
}
if (attrib.Key.Equals("fmtp"))
{
fmtp = attrib as Rtsp.Sdp.AttributFmtp;
}
if (attrib.Key.Equals("rtpmap"))
{
rtpmap = attrib as Rtsp.Sdp.AttributRtpMap;
}
}
// If the rtpmap contains H264 then split the fmtp to get the sprop-parameter-sets which hold the SPS and PPS in base64
if (rtpmap != null && rtpmap.Value.Contains("H264") && fmtp != null)
{
video_codec = "H264";
var param = Rtsp.Sdp.H264Parameters.Parse(fmtp.FormatParameter);
var sps_pps = param.SpropParameterSets;
if (sps_pps.Count() >= 2)
{
byte[] sps = sps_pps[0];
byte[] pps = sps_pps[1];
Output_SPS_PPS(sps, pps); // output SPS and PPS
}
}
RtspTransport transport = null;
if (rtp_transport == RTP_TRANSPORT.TCP)
{
// Server interleaves the RTP packets over the RTSP connection
// Example for TCP mode (RTP over RTSP) Transport: RTP/AVP/TCP;interleaved=0-1
video_data_channel = 0; // Used in DataReceived event handler
video_rtcp_channel = 1; // Used in DataReceived event handler
transport = new RtspTransport()
{
LowerTransport = RtspTransport.LowerTransportType.TCP,
Interleaved = new PortCouple(video_data_channel, video_rtcp_channel), // Channel 0 for video. Channel 1 for RTCP status reports
};
}
if (rtp_transport == RTP_TRANSPORT.UDP)
{
// Server sends the RTP packets to a Pair of UDP Ports (one for data, one for rtcp control messages)
// Example for UDP mode Transport: RTP/AVP;unicast;client_port=8000-8001
video_data_channel = udp_pair.data_port; // Used in DataReceived event handler
video_rtcp_channel = udp_pair.control_port; // Used in DataReceived event handler
transport = new RtspTransport()
{
LowerTransport = RtspTransport.LowerTransportType.UDP,
IsMulticast = false,
ClientPort = new PortCouple(video_data_channel, video_rtcp_channel), // a Channel for video. a Channel for RTCP status reports
};
}
if (rtp_transport == RTP_TRANSPORT.MULTICAST)
{
// Server sends the RTP packets to a Pair of UDP ports (one for data, one for rtcp control messages)
// using Multicast Address and Ports that are in the reply to the SETUP message
// Example for MULTICAST mode Transport: RTP/AVP;multicast
video_data_channel = 0; // we get this information in the SETUP message reply
video_rtcp_channel = 0; // we get this information in the SETUP message reply
transport = new RtspTransport()
{
LowerTransport = RtspTransport.LowerTransportType.UDP,
IsMulticast = true
};
}
// Send SETUP
Rtsp.Messages.RtspRequestSetup setup_message = new Rtsp.Messages.RtspRequestSetup();
setup_message.RtspUri = new Uri(control);
setup_message.AddTransport(transport);
if (authentication != AUTHENTICATION.NONE)
{
String authorization_string = GenerateAuthorization(username, password, authentication,
realm, nonce, url, "SETUP");
if (authorization_string != null)
{
setup_message.Headers.Add("Authorization", authorization_string);
}
}
rtsp_client.SendMessage(setup_message);
}
}
}
}
// If we get a reply to SETUP (which was our third command), then process and then send PLAY
if (message.OriginalRequest != null && message.OriginalRequest is Rtsp.Messages.RtspRequestSetup)
{
// Got Reply to SETUP
if (message.IsOk == false)
{
Console.WriteLine("Got Error in SETUP Reply " + message.ReturnCode + " " + message.ReturnMessage);
return;
}
Console.WriteLine("Got reply from Setup. Session is " + message.Session);
session = message.Session; // Session value used with Play, Pause, Teardown
// Check the Transport header
if (message.Headers.ContainsKey(RtspHeaderNames.Transport))
{
RtspTransport transport = RtspTransport.Parse(message.Headers[RtspHeaderNames.Transport]);
// Check if Transport header includes Multicast
if (transport.IsMulticast)
{
String multicast_address = transport.Destination;
video_data_channel = transport.Port.First;
video_rtcp_channel = transport.Port.Second;
// Create the Pair of UDP Sockets in Multicast mode
udp_pair = new UDPSocket(multicast_address, video_data_channel, multicast_address, video_rtcp_channel);
udp_pair.DataReceived += Rtp_DataReceived;
udp_pair.Start();
}
}
// Send PLAY
Rtsp.Messages.RtspRequest play_message = new Rtsp.Messages.RtspRequestPlay();
play_message.RtspUri = new Uri(url);
play_message.Session = session;
if (authentication != AUTHENTICATION.NONE)
{
String authorization_string = GenerateAuthorization(username, password, authentication,
realm, nonce, url, "PLAY");
if (authorization_string != null)
{
play_message.Headers.Add("Authorization", authorization_string);
}
}
rtsp_client.SendMessage(play_message);
}
// If we get a reply to PLAY (which was our fourth command), then we should have video being received
if (message.OriginalRequest != null && message.OriginalRequest is Rtsp.Messages.RtspRequestPlay)
{
// Got Reply to PLAY
if (message.IsOk == false)
{
Console.WriteLine("Got Error in PLAY Reply " + message.ReturnCode + " " + message.ReturnMessage);
return;
}
Console.WriteLine("Got reply from Play " + message.Command);
}
}
// RTSP Messages are OPTIONS, DESCRIBE, SETUP, PLAY etc
private void Rtsp_MessageReceived(object sender, Rtsp.RtspChunkEventArgs e)
{
Rtsp.Messages.RtspResponse message = e.Message as Rtsp.Messages.RtspResponse;
Console.WriteLine("Received " + message.OriginalRequest.ToString());
// Check if the Message has an Authenticate header. If so we update the 'realm' and 'nonce'
if (message.Headers.ContainsKey(RtspHeaderNames.WWWAuthenticate))
{
String www_authenticate = message.Headers[RtspHeaderNames.WWWAuthenticate];
// Parse www_authenticate
// EG: Digest realm="AXIS_WS_ACCC8E3A0A8F", nonce="000057c3Y810622bff50b36005eb5efeae118626a161bf", stale=FALSE
string[] items = www_authenticate.Split(new char[] { ',', ' ' });
foreach (string item in items)
{
// Split on the = symbol and load in
string[] parts = item.Split(new char[] { '=' });
if (parts.Count() >= 2 && parts[0].Trim().Equals("realm"))
{
realm = parts[1].Trim(new char[] { ' ', '\"' }); // trim space and quotes
}
else if (parts.Count() >= 2 && parts[0].Trim().Equals("nonce"))
{
nonce = parts[1].Trim(new char[] { ' ', '\"' }); // trim space and quotes
}
}
Console.WriteLine("WWW Authorize parsed for " + realm + " " + nonce);
}
// If we get a reply to OPTIONS and CSEQ is 1 (which was our first command), then send the DESCRIBE
// If we fer a reply to OPTIONS and CSEQ is not 1, it must have been a keepalive command
if (message.OriginalRequest != null && message.OriginalRequest is Rtsp.Messages.RtspRequestOptions)
{
if (message.CSeq == 1)
{
// Start a Timer to send an OPTIONS command (for keepalive) every 20 seconds
keepalive_timer = new System.Timers.Timer();
keepalive_timer.Elapsed += Timer_Elapsed;
keepalive_timer.Interval = 20 * 1000;
keepalive_timer.Enabled = true;
// send the DESCRIBE. First time around we have no WWW-Authorise
Rtsp.Messages.RtspRequest describe_message = new Rtsp.Messages.RtspRequestDescribe();
describe_message.RtspUri = new Uri(url);
rtsp_client.SendMessage(describe_message);
}
else
{
// do nothing
}
}
// If we get a reply to DESCRIBE (which was our second command), then prosess SDP and send the SETUP
if (message.OriginalRequest != null && message.OriginalRequest is Rtsp.Messages.RtspRequestDescribe)
{
// Got a reply for DESCRIBE
// First time we send DESCRIBE we will not have the authorization Nonce so we
// handle the Unauthorized 401 error here and send a new DESCRIBE message
if (message.IsOk == false)
{
Console.WriteLine("Got Error in DESCRIBE Reply " + message.ReturnCode + " " + message.ReturnMessage);
if (message.ReturnCode == 401 && (message.OriginalRequest.Headers.ContainsKey(RtspHeaderNames.Authorization) == false))
{
// Error 401 - Unauthorized, but the request did not use Authorizarion.
if (username == null || password == null)
{
// we do nothave a username or password. Abort
return;
}
// Send a new DESCRIBE with authorization
String digest_authorization = GenerateDigestAuthorization(username, password,
realm, nonce, url, "DESCRIBE");
Rtsp.Messages.RtspRequest describe_message = new Rtsp.Messages.RtspRequestDescribe();
describe_message.RtspUri = new Uri(url);
if (digest_authorization != null)
{
describe_message.Headers.Add(RtspHeaderNames.Authorization, digest_authorization);
}
rtsp_client.SendMessage(describe_message);
return;
}
else if (message.ReturnCode == 401 && (message.OriginalRequest.Headers.ContainsKey(RtspHeaderNames.Authorization) == true))
{
// Authorization failed
return;
}
else
{
// some other error
return;
}
}
// Examine the SDP
Console.Write(System.Text.Encoding.UTF8.GetString(message.Data));
Rtsp.Sdp.SdpFile sdp_data;
using (StreamReader sdp_stream = new StreamReader(new MemoryStream(message.Data)))
{
sdp_data = Rtsp.Sdp.SdpFile.Read(sdp_stream);
}
// Process each 'Media' Attribute in the SDP (each sub-stream)
for (int x = 0; x < sdp_data.Medias.Count; x++)
{
bool audio = (sdp_data.Medias[x].MediaType == Rtsp.Sdp.Media.MediaTypes.audio);
bool video = (sdp_data.Medias[x].MediaType == Rtsp.Sdp.Media.MediaTypes.video);
if (video && video_payload != -1)
{
continue; // have already matched an video payload
}
if (audio && audio_payload != -1)
{
continue; // have already matched an audio payload
}
if (audio || video)
{
// search the attributes for control, rtpmap and fmtp
// (fmtp only applies to video)
String control = ""; // the "track" or "stream id"
Rtsp.Sdp.AttributFmtp fmtp = null; // holds SPS and PPS in base64 (h264 video)
foreach (Rtsp.Sdp.Attribut attrib in sdp_data.Medias[x].Attributs)
{
if (attrib.Key.Equals("control"))
{
String sdp_control = attrib.Value;
if (sdp_control.ToLower().StartsWith("rtsp://"))
{
control = sdp_control; //absolute path
}
else
{
control = url + "/" + sdp_control; // relative path
}
}
if (attrib.Key.Equals("fmtp"))
{
fmtp = attrib as Rtsp.Sdp.AttributFmtp;
}
if (attrib.Key.Equals("rtpmap"))
{
Rtsp.Sdp.AttributRtpMap rtpmap = attrib as Rtsp.Sdp.AttributRtpMap;
// Check if the Codec Used (EncodingName) is one we support
String[] valid_video_codecs = { "H264" };
String[] valid_audio_codecs = { "PCMA", "PCMU" };
if (video && Array.IndexOf(valid_video_codecs, rtpmap.EncodingName) >= 0)
{
// found a valid codec
video_codec = rtpmap.EncodingName;
video_payload = sdp_data.Medias[x].PayloadType;
}
if (audio && Array.IndexOf(valid_audio_codecs, rtpmap.EncodingName) >= 0)
{
audio_codec = rtpmap.EncodingName;
audio_payload = sdp_data.Medias[x].PayloadType;
}
}
}
// If the rtpmap contains H264 then split the fmtp to get the sprop-parameter-sets which hold the SPS and PPS in base64
if (video && video_codec.Contains("H264") && fmtp != null)
{
var param = Rtsp.Sdp.H264Parameters.Parse(fmtp.FormatParameter);
var sps_pps = param.SpropParameterSets;
if (sps_pps.Count() >= 2)
{
byte[] sps = sps_pps[0];
byte[] pps = sps_pps[1];
if (Received_SPS_PPS != null)
{
Received_SPS_PPS(sps, pps);
}
}
}
// Send the SETUP RTSP command if we have a matching Payload Decoder
if (video && video_payload == -1)
{
continue;
}
if (audio && audio_payload == -1)
{
continue;
}
RtspTransport transport = null;
int data_channel = 0;
int rtcp_channel = 0;
if (rtp_transport == RTP_TRANSPORT.TCP)
{
// Server interleaves the RTP packets over the RTSP connection
// Example for TCP mode (RTP over RTSP) Transport: RTP/AVP/TCP;interleaved=0-1
if (video)
{
video_data_channel = 0;
video_rtcp_channel = 1;
data_channel = video_data_channel;
rtcp_channel = video_rtcp_channel;
}
if (audio)
{
audio_data_channel = 2;
audio_rtcp_channel = 3;
data_channel = audio_data_channel;
rtcp_channel = audio_rtcp_channel;
}
transport = new RtspTransport()
{
LowerTransport = RtspTransport.LowerTransportType.TCP,
Interleaved = new PortCouple(data_channel, rtcp_channel), // Eg Channel 0 for video. Channel 1 for RTCP status reports
};
}
if (rtp_transport == RTP_TRANSPORT.UDP)
{
// Server sends the RTP packets to a Pair of UDP Ports (one for data, one for rtcp control messages)
// Example for UDP mode Transport: RTP/AVP;unicast;client_port=8000-8001
if (video)
{
video_data_channel = video_udp_pair.data_port; // Used in DataReceived event handler
video_rtcp_channel = video_udp_pair.control_port; // Used in DataReceived event handler
data_channel = video_data_channel;
rtcp_channel = video_rtcp_channel;
}
if (audio)
{
audio_data_channel = audio_udp_pair.data_port; // Used in DataReceived event handler
audio_rtcp_channel = audio_udp_pair.control_port; // Used in DataReceived event handler
data_channel = audio_data_channel;
rtcp_channel = audio_rtcp_channel;
}
transport = new RtspTransport()
{
LowerTransport = RtspTransport.LowerTransportType.UDP,
IsMulticast = false,
ClientPort = new PortCouple(data_channel, rtcp_channel), // a Channel for data (video or audio). a Channel for RTCP status reports
};
}
if (rtp_transport == RTP_TRANSPORT.MULTICAST)
{
// Server sends the RTP packets to a Pair of UDP ports (one for data, one for rtcp control messages)
// using Multicast Address and Ports that are in the reply to the SETUP message
// Example for MULTICAST mode Transport: RTP/AVP;multicast
if (video)
{
video_data_channel = 0; // we get this information in the SETUP message reply
video_rtcp_channel = 0; // we get this information in the SETUP message reply
}
if (audio)
{
audio_data_channel = 0; // we get this information in the SETUP message reply
audio_rtcp_channel = 0; // we get this information in the SETUP message reply
}
transport = new RtspTransport()
{
LowerTransport = RtspTransport.LowerTransportType.UDP,
IsMulticast = true
};
}
// Add authorization (if there is a username and password)
String digest_authorization = GenerateDigestAuthorization(username, password,
realm, nonce, url, "SETUP");
// Send SETUP
Rtsp.Messages.RtspRequestSetup setup_message = new Rtsp.Messages.RtspRequestSetup();
setup_message.RtspUri = new Uri(control);
setup_message.AddTransport(transport);
if (digest_authorization != null)
{
setup_message.Headers.Add("Authorization", digest_authorization);
}
rtsp_client.SendMessage(setup_message);
}
}
}
// If we get a reply to SETUP (which was our third command), then process and then send PLAY
if (message.OriginalRequest != null && message.OriginalRequest is Rtsp.Messages.RtspRequestSetup)
{
// Got Reply to SETUP
if (message.IsOk == false)
{
Console.WriteLine("Got Error in SETUP Reply " + message.ReturnCode + " " + message.ReturnMessage);
return;
}
Console.WriteLine("Got reply from Setup. Session is " + message.Session);
session = message.Session; // Session value used with Play, Pause, Teardown
// Check the Transport header
if (message.Headers.ContainsKey(RtspHeaderNames.Transport))
{
RtspTransport transport = RtspTransport.Parse(message.Headers[RtspHeaderNames.Transport]);
// Check if Transport header includes Multicast
if (transport.IsMulticast)
{
String multicast_address = transport.Destination;
video_data_channel = transport.Port.First;
video_rtcp_channel = transport.Port.Second;
// Create the Pair of UDP Sockets in Multicast mode
video_udp_pair = new Rtsp.UDPSocket(multicast_address, video_data_channel, multicast_address, video_rtcp_channel);
video_udp_pair.DataReceived += Rtp_DataReceived;
video_udp_pair.Start();
// TODO - Need to set audio_udp_pair
}
}
// Send PLAY
Rtsp.Messages.RtspRequest play_message = new Rtsp.Messages.RtspRequestPlay();
play_message.RtspUri = new Uri(url);
play_message.Session = session;
rtsp_client.SendMessage(play_message);
}
// If we get a reply to PLAY (which was our fourth command), then we should have video being received
if (message.OriginalRequest != null && message.OriginalRequest is Rtsp.Messages.RtspRequestPlay)
{
// Got Reply to PLAY
if (message.IsOk == false)
{
Console.WriteLine("Got Error in PLAY Reply " + message.ReturnCode + " " + message.ReturnMessage);
return;
}
Console.WriteLine("Got reply from Play " + message.Command);
}
}
// RTSP Messages are OPTIONS, DESCRIBE, SETUP, PLAY etc
private void Rtsp_MessageReceived(object sender, Rtsp.RtspChunkEventArgs e)
{
Rtsp.Messages.RtspResponse message = e.Message as Rtsp.Messages.RtspResponse;
Console.WriteLine("Received " + message.OriginalRequest.ToString());
// If message has a 401 - Unauthorised Error, then we re-send the message with Authorization
// using the most recently received 'realm' and 'nonce'
if (message.IsOk == false)
{
Console.WriteLine("Got Error in RTSP Reply " + message.ReturnCode + " " + message.ReturnMessage);
if (message.ReturnCode == 401 && (message.OriginalRequest.Headers.ContainsKey(RtspHeaderNames.Authorization) == true))
{
// the authorization failed.
Stop();
return;
}
// Check if the Reply has an Authenticate header.
if (message.ReturnCode == 401 && message.Headers.ContainsKey(RtspHeaderNames.WWWAuthenticate))
{
// Process the WWW-Authenticate header
// EG: Basic realm="AProxy"
// EG: Digest realm="AXIS_WS_ACCC8E3A0A8F", nonce="000057c3Y810622bff50b36005eb5efeae118626a161bf", stale=FALSE
String www_authenticate = message.Headers[RtspHeaderNames.WWWAuthenticate];
string[] items = www_authenticate.Split(new char[] { ',', ' ' });
foreach (string item in items)
{
if (item.ToLower().Equals("basic"))
{
auth_type = "Basic";
}
else if (item.ToLower().Equals("digest"))
{
auth_type = "Digest";
}
else
{
// Split on the = symbol and update the realm and nonce
string[] parts = item.Split(new char[] { '=' }, 2); // max 2 parts in the results array
if (parts.Count() >= 2 && parts[0].Trim().Equals("realm"))
{
realm = parts[1].Trim(new char[] { ' ', '\"' }); // trim space and quotes
}
else if (parts.Count() >= 2 && parts[0].Trim().Equals("nonce"))
{
nonce = parts[1].Trim(new char[] { ' ', '\"' }); // trim space and quotes
}
}
}
Console.WriteLine("WWW Authorize parsed for " + auth_type + " " + realm + " " + nonce);
}
RtspMessage resend_message = message.OriginalRequest.Clone() as RtspMessage;
if (auth_type != null)
{
AddAuthorization(resend_message, username, password, auth_type, realm, nonce, url);
}
rtsp_client.SendMessage(resend_message);
return;
}
// If we get a reply to OPTIONS then start the Keepalive Timer and send DESCRIBE
if (message.OriginalRequest != null && message.OriginalRequest is Rtsp.Messages.RtspRequestOptions)
{
if (keepalive_timer == null)
{
// Start a Timer to send an OPTIONS command (for keepalive) every 20 seconds
keepalive_timer = new System.Timers.Timer();
keepalive_timer.Elapsed += Timer_Elapsed;
keepalive_timer.Interval = 20 * 1000;
keepalive_timer.Enabled = true;
// Send DESCRIBE
Rtsp.Messages.RtspRequest describe_message = new Rtsp.Messages.RtspRequestDescribe();
describe_message.RtspUri = new Uri(url);
if (auth_type != null)
{
AddAuthorization(describe_message, username, password, auth_type, realm, nonce, url);
}
rtsp_client.SendMessage(describe_message);
}
else
{
// do nothing
}
}
// If we get a reply to DESCRIBE (which was our second command), then prosess SDP and send the SETUP
if (message.OriginalRequest != null && message.OriginalRequest is Rtsp.Messages.RtspRequestDescribe)
{
// Got a reply for DESCRIBE
if (message.IsOk == false)
{
Console.WriteLine("Got Error in DESCRIBE Reply " + message.ReturnCode + " " + message.ReturnMessage);
return;
}
// Examine the SDP
Console.Write(System.Text.Encoding.UTF8.GetString(message.Data));
Rtsp.Sdp.SdpFile sdp_data;
using (StreamReader sdp_stream = new StreamReader(new MemoryStream(message.Data)))
{
sdp_data = Rtsp.Sdp.SdpFile.Read(sdp_stream);
}
// RTP and RTCP 'channels' are used in TCP Interleaved mode (RTP over RTSP)
int next_free_rtp_channel = 0;
int next_free_rtcp_channel = 1;
// Process each 'Media' Attribute in the SDP (each sub-stream)
for (int x = 0; x < sdp_data.Medias.Count; x++)
{
bool audio = (sdp_data.Medias[x].MediaType == Rtsp.Sdp.Media.MediaTypes.audio);
bool video = (sdp_data.Medias[x].MediaType == Rtsp.Sdp.Media.MediaTypes.video);
if (video && video_payload != -1)
{
continue; // have already matched an video payload
}
if (audio && audio_payload != -1)
{
continue; // have already matched an audio payload
}
if (audio || video)
{
// search the attributes for control, rtpmap and fmtp
// (fmtp only applies to video)
String control = ""; // the "track" or "stream id"
Rtsp.Sdp.AttributFmtp fmtp = null; // holds SPS and PPS in base64 (h264 video)
foreach (Rtsp.Sdp.Attribut attrib in sdp_data.Medias[x].Attributs)
{
if (attrib.Key.Equals("control"))
{
String sdp_control = attrib.Value;
if (sdp_control.ToLower().StartsWith("rtsp://"))
{
control = sdp_control; //absolute path
}
else
{
control = url + "/" + sdp_control; // relative path
}
}
if (attrib.Key.Equals("fmtp"))
{
fmtp = attrib as Rtsp.Sdp.AttributFmtp;
}
if (attrib.Key.Equals("rtpmap"))
{
Rtsp.Sdp.AttributRtpMap rtpmap = attrib as Rtsp.Sdp.AttributRtpMap;
// Check if the Codec Used (EncodingName) is one we support
String[] valid_video_codecs = { "H264" };
String[] valid_audio_codecs = { "PCMA", "PCMU", "AMR" };
if (video && Array.IndexOf(valid_video_codecs, rtpmap.EncodingName) >= 0)
{
// found a valid codec
video_codec = rtpmap.EncodingName;
video_payload = sdp_data.Medias[x].PayloadType;
}
if (audio && Array.IndexOf(valid_audio_codecs, rtpmap.EncodingName) >= 0)
{
audio_codec = rtpmap.EncodingName;
audio_payload = sdp_data.Medias[x].PayloadType;
}
}
}
// If the rtpmap contains H264 then split the fmtp to get the sprop-parameter-sets which hold the SPS and PPS in base64
if (video && video_codec.Contains("H264") && fmtp != null)
{
var param = Rtsp.Sdp.H264Parameters.Parse(fmtp.FormatParameter);
var sps_pps = param.SpropParameterSets;
if (sps_pps.Count() >= 2)
{
byte[] sps = sps_pps[0];
byte[] pps = sps_pps[1];
if (Received_SPS_PPS != null)
{
Received_SPS_PPS(sps, pps);
}
}
}
// Send the SETUP RTSP command if we have a matching Payload Decoder
if (video && video_payload == -1)
{
continue;
}
if (audio && audio_payload == -1)
{
continue;
}
RtspTransport transport = null;
if (rtp_transport == RTP_TRANSPORT.TCP)
{
// Server interleaves the RTP packets over the RTSP connection
// Example for TCP mode (RTP over RTSP) Transport: RTP/AVP/TCP;interleaved=0-1
if (video)
{
video_data_channel = next_free_rtp_channel;
video_rtcp_channel = next_free_rtcp_channel;
}
if (audio)
{
audio_data_channel = next_free_rtp_channel;
audio_rtcp_channel = next_free_rtcp_channel;
}
transport = new RtspTransport()
{
LowerTransport = RtspTransport.LowerTransportType.TCP,
Interleaved = new PortCouple(next_free_rtp_channel, next_free_rtcp_channel), // Eg Channel 0 for RTP video data. Channel 1 for RTCP status reports
};
next_free_rtp_channel += 2;
next_free_rtcp_channel += 2;
}
if (rtp_transport == RTP_TRANSPORT.UDP)
{
int rtp_port = 0;
int rtcp_port = 0;
// Server sends the RTP packets to a Pair of UDP Ports (one for data, one for rtcp control messages)
// Example for UDP mode Transport: RTP/AVP;unicast;client_port=8000-8001
if (video)
{
video_data_channel = video_udp_pair.data_port; // Used in DataReceived event handler
video_rtcp_channel = video_udp_pair.control_port; // Used in DataReceived event handler
rtp_port = video_udp_pair.data_port;
rtcp_port = video_udp_pair.control_port;
}
if (audio)
{
audio_data_channel = audio_udp_pair.data_port; // Used in DataReceived event handler
audio_rtcp_channel = audio_udp_pair.control_port; // Used in DataReceived event handler
rtp_port = audio_udp_pair.data_port;
rtcp_port = audio_udp_pair.control_port;
}
transport = new RtspTransport()
{
LowerTransport = RtspTransport.LowerTransportType.UDP,
IsMulticast = false,
ClientPort = new PortCouple(rtp_port, rtcp_port), // a UDP Port for data (video or audio). a UDP Port for RTCP status reports
};
}
if (rtp_transport == RTP_TRANSPORT.MULTICAST)
{
// Server sends the RTP packets to a Pair of UDP ports (one for data, one for rtcp control messages)
// using Multicast Address and Ports that are in the reply to the SETUP message
// Example for MULTICAST mode Transport: RTP/AVP;multicast
if (video)
{
video_data_channel = 0; // we get this information in the SETUP message reply
video_rtcp_channel = 0; // we get this information in the SETUP message reply
}
if (audio)
{
audio_data_channel = 0; // we get this information in the SETUP message reply
audio_rtcp_channel = 0; // we get this information in the SETUP message reply
}
transport = new RtspTransport()
{
LowerTransport = RtspTransport.LowerTransportType.UDP,
IsMulticast = true
};
}
// Generate SETUP messages
Rtsp.Messages.RtspRequestSetup setup_message = new Rtsp.Messages.RtspRequestSetup();
setup_message.RtspUri = new Uri(control);
setup_message.AddTransport(transport);
if (auth_type != null)
{
AddAuthorization(setup_message, username, password, auth_type, realm, nonce, url);
}
// Add SETUP message to list of mesages to send
setup_messages.Add(setup_message);
}
}
// Send the FIRST SETUP message and remove it from the list of Setup Messages
rtsp_client.SendMessage(setup_messages[0]);
setup_messages.RemoveAt(0);
}
// If we get a reply to SETUP (which was our third command), then we
// (i) check if we have any more SETUP commands to send out (eg if we are doing SETUP for Video and Audio)
// (ii) send a PLAY command if all the SETUP command have been sent
if (message.OriginalRequest != null && message.OriginalRequest is Rtsp.Messages.RtspRequestSetup)
{
// Got Reply to SETUP
if (message.IsOk == false)
{
Console.WriteLine("Got Error in SETUP Reply " + message.ReturnCode + " " + message.ReturnMessage);
return;
}
Console.WriteLine("Got reply from Setup. Session is " + message.Session);
session = message.Session; // Session value used with Play, Pause, Teardown and and additional Setups
// Check the Transport header
if (message.Headers.ContainsKey(RtspHeaderNames.Transport))
{
RtspTransport transport = RtspTransport.Parse(message.Headers[RtspHeaderNames.Transport]);
// Check if Transport header includes Multicast
if (transport.IsMulticast)
{
String multicast_address = transport.Destination;
video_data_channel = transport.Port.First;
video_rtcp_channel = transport.Port.Second;
// Create the Pair of UDP Sockets in Multicast mode
video_udp_pair = new Rtsp.UDPSocket(multicast_address, video_data_channel, multicast_address, video_rtcp_channel);
video_udp_pair.DataReceived += Rtp_DataReceived;
video_udp_pair.Start();
// TODO - Need to set audio_udp_pair
}
}
// Check if we have another SETUP command to send, then remote it from the list
if (setup_messages.Count > 0)
{
// send the next SETUP message, after adding in the 'session'
Rtsp.Messages.RtspRequestSetup next_setup = setup_messages[0];
next_setup.Session = session;
rtsp_client.SendMessage(next_setup);
setup_messages.RemoveAt(0);
}
else
{
// Send PLAY
Rtsp.Messages.RtspRequest play_message = new Rtsp.Messages.RtspRequestPlay();
play_message.RtspUri = new Uri(url);
play_message.Session = session;
if (auth_type != null)
{
AddAuthorization(play_message, username, password, auth_type, realm, nonce, url);
}
rtsp_client.SendMessage(play_message);
}
}
// If we get a reply to PLAY (which was our fourth command), then we should have video being received
if (message.OriginalRequest != null && message.OriginalRequest is Rtsp.Messages.RtspRequestPlay)
{
// Got Reply to PLAY
if (message.IsOk == false)
{
Console.WriteLine("Got Error in PLAY Reply " + message.ReturnCode + " " + message.ReturnMessage);
return;
}
Console.WriteLine("Got reply from Play " + message.Command);
}
}
// RTSP Messages are OPTIONS, DESCRIBE, SETUP, PLAY etc
private void Rtsp_MessageReceived(object sender, Rtsp.RtspChunkEventArgs e)
{
Rtsp.Messages.RtspResponse message = e.Message as Rtsp.Messages.RtspResponse;
Console.WriteLine("Received " + message.OriginalRequest.ToString());
// If we get a reply to OPTIONS and CSEQ is 1 (which was our first command), then send the DESCRIBE
// If we fer a reply to OPTIONS and CSEQ is not 1, it must have been a keepalive command
if (message.OriginalRequest != null && message.OriginalRequest is Rtsp.Messages.RtspRequestOptions)
{
if (message.CSeq == 1)
{
// Start a Timer to send an OPTIONS command (for keepalive) every 20 seconds
keepalive_timer = new System.Timers.Timer();
keepalive_timer.Elapsed += Timer_Elapsed;
keepalive_timer.Interval = 20 * 1000;
keepalive_timer.Enabled = true;
// send the Describe
Rtsp.Messages.RtspRequest describe_message = new Rtsp.Messages.RtspRequestDescribe();
describe_message.RtspUri = new Uri(url);
rtsp_client.SendMessage(describe_message);
}
else
{
// do nothing
}
}
// If we get a reply to DESCRIBE (which was our second command), then prosess SDP and send the SETUP
if (message.OriginalRequest != null && message.OriginalRequest is Rtsp.Messages.RtspRequestDescribe)
{
// Got a reply for DESCRIBE
// Examine the SDP
Console.Write(System.Text.Encoding.UTF8.GetString(message.Data));
Rtsp.Sdp.SdpFile sdp_data;
using (StreamReader sdp_stream = new StreamReader(new MemoryStream(message.Data)))
{
sdp_data = Rtsp.Sdp.SdpFile.Read(sdp_stream);
}
// Process each 'Media' Attribute in the SDP (each sub-stream)
// If the attribute is for Video, then carry out a SETUP and a PLAY
// Only do this for the first Video attribute in case there is more than one in the SDP
for (int x = 0; x < sdp_data.Medias.Count; x++)
{
if (sdp_data.Medias[x].GetMediaType() == Rtsp.Sdp.Media.MediaType.video)
{
// We only want the first video sub-stream
if (video_payload == -1)
{
// seach the atributes for control, fmtp and rtpmap
String control = ""; // the "track" or "stream id"
Rtsp.Sdp.AttributFmtp fmtp = null; // holds SPS and PPS in base64
Rtsp.Sdp.AttributRtpMap rtpmap = null; // holds Payload format, eg 96 often used with H264 as first dynamic payload value
foreach (Rtsp.Sdp.Attribut attrib in sdp_data.Medias[x].Attributs)
{
if (attrib.Key.Equals("control"))
{
control = attrib.Value;
}
if (attrib.Key.Equals("fmtp"))
{
fmtp = attrib as Rtsp.Sdp.AttributFmtp;
}
if (attrib.Key.Equals("rtpmap"))
{
rtpmap = attrib as Rtsp.Sdp.AttributRtpMap;
}
}
// Split the fmtp to get the sprop-parameter-sets which hold the SPS and PPS in base64
if (fmtp != null)
{
var param = Rtsp.Sdp.H264Parameters.Parse(fmtp.FormatParameter);
var sps_pps = param.SpropParameterSets;
if (sps_pps.Count > 0)
{
video_sps = sps_pps[0];
}
if (sps_pps.Count > 1)
{
video_pps = sps_pps[1];
}
Output_NAL(sps_pps); // output SPS and PPS
}
// Split the rtpmap to get the Payload Type
video_payload = 0;
if (rtpmap != null)
{
video_payload = rtpmap.PayloadNumber;
}
Rtsp.Messages.RtspRequestSetup setup_message = new Rtsp.Messages.RtspRequestSetup();
setup_message.RtspUri = new Uri(url + "/" + control);
RtspTransport transport = null;
if (rtp_transport == RTP_TRANSPORT.TCP)
{
// Server interleaves the RTP packets over the RTSP connection
// Example for TCP mode (RTP over RTSP) Transport: RTP/AVP/TCP;interleaved=0-1
video_data_channel = 0; // Used in DataReceived event handler
video_rtcp_channel = 1; // Used in DataReceived event handler
transport = new RtspTransport()
{
LowerTransport = RtspTransport.LowerTransportType.TCP,
Interleaved = new PortCouple(video_data_channel, video_rtcp_channel), // Channel 0 for video. Channel 1 for RTCP status reports
};
}
if (rtp_transport == RTP_TRANSPORT.UDP)
{
// Server sends the RTP packets to a Pair of UDP Ports (one for data, one for rtcp control messages)
// Example for UDP mode Transport: RTP/AVP;unicast;client_port=8000-8001
video_data_channel = udp_pair.data_port; // Used in DataReceived event handler
video_rtcp_channel = udp_pair.control_port; // Used in DataReceived event handler
transport = new RtspTransport()
{
LowerTransport = RtspTransport.LowerTransportType.UDP,
IsMulticast = false,
ClientPort = new PortCouple(video_data_channel, video_rtcp_channel), // a Channel for video. a Channel for RTCP status reports
};
}
if (rtp_transport == RTP_TRANSPORT.MULTICAST)
{
// Server sends the RTP packets to a Pair of UDP ports (one for data, one for rtcp control messages)
// using Multicast Address and Ports that are in the reply to the SETUP message
// Example for MULTICAST mode Transport: RTP/AVP;multicast
video_data_channel = 0; // we get this information in the SETUP message reply
video_rtcp_channel = 0; // we get this information in the SETUP message reply
transport = new RtspTransport()
{
LowerTransport = RtspTransport.LowerTransportType.UDP,
IsMulticast = true
};
}
setup_message.AddTransport(transport);
rtsp_client.SendMessage(setup_message);
}
}
}
}
// If we get a reply to SETUP (which was our third command), then process then send PLAY
if (message.OriginalRequest != null && message.OriginalRequest is Rtsp.Messages.RtspRequestSetup)
{
// Got Reply to SETUP
Console.WriteLine("Got reply from Setup. Session is " + message.Session);
session = message.Session; // Session value used with Play, Pause, Teardown
// Check the Transport header
if (message.Headers.ContainsKey(RtspHeaderNames.Transport))
{
RtspTransport transport = RtspTransport.Parse(message.Headers[RtspHeaderNames.Transport]);
// Check if Transport header includes Multicast
if (transport.IsMulticast)
{
String multicast_address = transport.Destination;
video_data_channel = transport.Port.First;
video_rtcp_channel = transport.Port.Second;
// Create the Pair of UDP Sockets in Multicast mode
udp_pair = new UDPSocket(multicast_address, video_data_channel, multicast_address, video_rtcp_channel);
udp_pair.DataReceived += Rtp_DataReceived;
udp_pair.Start();
}
}
Rtsp.Messages.RtspRequest play_message = new Rtsp.Messages.RtspRequestPlay();
play_message.RtspUri = new Uri(url);
play_message.Session = session;
rtsp_client.SendMessage(play_message);
}
// If we get a reply to PLAY (which was our fourth command), then we should have video being received
if (message.OriginalRequest != null && message.OriginalRequest is Rtsp.Messages.RtspRequestPlay)
{
// Got Reply to PLAY
Console.WriteLine("Got reply from Play " + message.Command);
}
}
// RTSP Messages are OPTIONS, DESCRIBE, SETUP, PLAY etc
private void Rtsp_MessageReceived(object sender, Rtsp.RtspChunkEventArgs e)
{
Rtsp.Messages.RtspResponse message = e.Message as Rtsp.Messages.RtspResponse;
Console.WriteLine("Received " + message.OriginalRequest.ToString());
// If we get a reply to OPTIONS and CSEQ is 1 (which was our first command), then send the DESCRIBE
// If we fer a reply to OPTIONS and CSEQ is not 1, it must have been a keepalive command
if (message.OriginalRequest != null && message.OriginalRequest is Rtsp.Messages.RtspRequestOptions)
{
if (message.CSeq == 1)
{
// Start a Timer to send an OPTIONS command (for keepalive) every 20 seconds
keepalive_timer = new System.Timers.Timer();
keepalive_timer.Elapsed += Timer_Elapsed;
keepalive_timer.Interval = 20 * 1000;
keepalive_timer.Enabled = true;
// send the Describe
Rtsp.Messages.RtspRequest describe_message = new Rtsp.Messages.RtspRequestDescribe();
describe_message.RtspUri = new Uri(url);
rtsp_client.SendMessage(describe_message);
}
else
{
// do nothing
}
}
// If we get a reply to DESCRIBE (which was our second command), then prosess SDP and send the SETUP
if (message.OriginalRequest != null && message.OriginalRequest is Rtsp.Messages.RtspRequestDescribe)
{
// Got a reply for DESCRIBE
// Examine the SDP
Console.Write(System.Text.Encoding.UTF8.GetString(message.Data));
Rtsp.Sdp.SdpFile sdp_data;
using (StreamReader sdp_stream = new StreamReader(new MemoryStream(message.Data)))
{
sdp_data = Rtsp.Sdp.SdpFile.Read(sdp_stream);
}
// Process each 'Media' Attribute in the SDP (each sub-stream)
// If the attribute is for Video, then carry out a SETUP and a PLAY
// Only do this for the first Video attribute in case there is more than one in the SDP
for (int x = 0; x < sdp_data.Medias.Count; x++)
{
if (sdp_data.Medias[x].GetMediaType() == Rtsp.Sdp.Media.MediaType.video)
{
// We only want the first video sub-stream
if (video_payload == -1)
{
// seach the atributes for control, fmtp and rtpmap
String control = ""; // the "track" or "stream id"
Rtsp.Sdp.AttributFmtp fmtp = null; // holds SPS and PPS in base64
Rtsp.Sdp.AttributRtpMap rtpmap = null; // holds Payload format, eg 96 often used with H264 as first dynamic payload value
foreach (Rtsp.Sdp.Attribut attrib in sdp_data.Medias[x].Attributs)
{
if (attrib.Key.Equals("control")) control = attrib.Value;
if (attrib.Key.Equals("fmtp")) fmtp = attrib as Rtsp.Sdp.AttributFmtp;
if (attrib.Key.Equals("rtpmap")) rtpmap = attrib as Rtsp.Sdp.AttributRtpMap;
}
// Split the fmtp to get the sprop-parameter-sets which hold the SPS and PPS in base64
if (fmtp != null)
{
var param = Rtsp.Sdp.H264Parameters.Parse(fmtp.FormatParameter);
var sps_pps = param.SpropParameterSets;
if (sps_pps.Count > 0) video_sps = sps_pps[0];
if (sps_pps.Count > 1) video_pps = sps_pps[1];
Output_NAL(sps_pps); // output SPS and PPS
}
// Split the rtpmap to get the Payload Type
video_payload = 0;
if (rtpmap != null)
video_payload = rtpmap.PayloadNumber;
Rtsp.Messages.RtspRequestSetup setup_message = new Rtsp.Messages.RtspRequestSetup();
setup_message.RtspUri = new Uri(url + "/" + control);
RtspTransport transport = null;
if (rtp_transport == RTP_TRANSPORT.TCP)
{
// Server interleaves the RTP packets over the RTSP connection
// Example for TCP mode (RTP over RTSP) Transport: RTP/AVP/TCP;interleaved=0-1
video_data_channel = 0; // Used in DataReceived event handler
video_rtcp_channel = 1; // Used in DataReceived event handler
transport = new RtspTransport()
{
LowerTransport = RtspTransport.LowerTransportType.TCP,
Interleaved = new PortCouple(video_data_channel, video_rtcp_channel), // Channel 0 for video. Channel 1 for RTCP status reports
};
}
if (rtp_transport == RTP_TRANSPORT.UDP)
{
// Server sends the RTP packets to a Pair of UDP Ports (one for data, one for rtcp control messages)
// Example for UDP mode Transport: RTP/AVP;unicast;client_port=8000-8001
video_data_channel = udp_pair.data_port; // Used in DataReceived event handler
video_rtcp_channel = udp_pair.control_port; // Used in DataReceived event handler
transport = new RtspTransport()
{
LowerTransport = RtspTransport.LowerTransportType.UDP,
IsMulticast = false,
ClientPort = new PortCouple(video_data_channel, video_rtcp_channel), // a Channel for video. a Channel for RTCP status reports
};
}
if (rtp_transport == RTP_TRANSPORT.MULTICAST)
{
// Server sends the RTP packets to a Pair of UDP ports (one for data, one for rtcp control messages)
// using Multicast Address and Ports that are in the reply to the SETUP message
// Example for MULTICAST mode Transport: RTP/AVP;multicast
video_data_channel = 0; // we get this information in the SETUP message reply
video_rtcp_channel = 0; // we get this information in the SETUP message reply
transport = new RtspTransport()
{
LowerTransport = RtspTransport.LowerTransportType.UDP,
IsMulticast = true
};
}
setup_message.AddTransport(transport);
rtsp_client.SendMessage(setup_message);
}
}
}
}
// If we get a reply to SETUP (which was our third command), then process then send PLAY
if (message.OriginalRequest != null && message.OriginalRequest is Rtsp.Messages.RtspRequestSetup)
{
// Got Reply to SETUP
Console.WriteLine("Got reply from Setup. Session is " + message.Session);
session = message.Session; // Session value used with Play, Pause, Teardown
// Check the Transport header
if (message.Headers.ContainsKey(RtspHeaderNames.Transport))
{
RtspTransport transport = RtspTransport.Parse(message.Headers[RtspHeaderNames.Transport]);
// Check if Transport header includes Multicast
if (transport.IsMulticast)
{
String multicast_address = transport.Destination;
video_data_channel = transport.Port.First;
video_rtcp_channel = transport.Port.Second;
// Create the Pair of UDP Sockets in Multicast mode
udp_pair = new UDPSocket(multicast_address, video_data_channel, multicast_address, video_rtcp_channel);
udp_pair.DataReceived += Rtp_DataReceived;
udp_pair.Start();
}
}
Rtsp.Messages.RtspRequest play_message = new Rtsp.Messages.RtspRequestPlay();
play_message.RtspUri = new Uri(url);
play_message.Session = session;
rtsp_client.SendMessage(play_message);
}
// If we get a reply to PLAY (which was our fourth command), then we should have video being received
if (message.OriginalRequest != null && message.OriginalRequest is Rtsp.Messages.RtspRequestPlay)
{
// Got Reply to PLAY
Console.WriteLine("Got reply from Play " + message.Command);
}
}