private void ProcessDescribeResponse(RtspResponse message)
{
// Got a reply for DESCRIBE
// Examine the SDP
Logger.Info(System.Text.Encoding.UTF8.GetString(message.Data));
Rtsp.Sdp.SdpFile sdpData;
using (StreamReader sdpStream = new StreamReader(new MemoryStream(message.Data)))
{
sdpData = Rtsp.Sdp.SdpFile.Read(sdpStream);
}
// 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 < sdpData.Medias.Count; x++)
{
if (sdpData.Medias[x].MediaType == Media.MediaTypes.video)
{
// We only want the first video sub-stream
if (videoPayloadType != -1)
{
return;
}
// search the attributes for control, fmtp and rtpmap
ParseAttributes(sdpData, x, out string control, out Rtsp.Sdp.AttributFmtp fmtp, out Rtsp.Sdp.AttributRtpMap rtpmap);
// 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);
OutputNal(param.SpropParameterSets); // output SPS and PPS
}
// Split the rtpmap to get the Payload Type
videoPayloadType = 0;
if (rtpmap != null)
{
videoPayloadType = rtpmap.PayloadNumber;
}
RtspRequestSetup setupMessage = new RtspRequestSetup();
setupMessage.RtspUri = new Uri(rtspUrl + "/" + control);
var transport = GetRTSPTransport();
setupMessage.AddTransport(transport);
PostRequest(setupMessage);
}
}
}
// RTSP Messages are OPTIONS, DESCRIBE, SETUP, PLAY etc
void Rtsp_MessageReceived(object sender, RtspChunkEventArgs e)
{
var message = e.Message as RtspResponse;
//logger.Debug ("Received " + message.OriginalRequest.Method);
// 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)
{
logger.Warn("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
}
}
}
//logger.Debug ("WWW Authorize parsed for " + auth_type + " " + realm + " " + nonce);
}
var 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 RtspRequestOptions)
{
string public_methods = message.Headers [RtspHeaderNames.Public];
SupportedMethods.Clear();
foreach (string method in public_methods.Split(','))
{
SupportedMethods.Add(method.Trim());
}
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 = 5 * 1000;
keepalive_timer.Enabled = true;
// Send DESCRIBE
var describe_message = new RtspRequestDescribe();
describe_message.RtspUri = new Uri(Url);
describe_message.AddAccept("application/sdp");
if (auth_type != null)
{
AddAuthorization(describe_message, Username, Password, auth_type, realm, nonce, Url);
}
rtsp_client.SendMessage(describe_message);
}
}
// 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 Mictlanix.DotNet.Rtsp.Messages.RtspRequestDescribe)
{
// Got a reply for DESCRIBE
if (!message.IsOk)
{
logger.Warn("Got Error in DESCRIBE Reply " + message.ReturnCode + " " + message.ReturnMessage);
return;
}
// Examine the SDP
//logger.Debug (Encoding.UTF8.GetString (message.Data));
Sdp.SdpFile sdp_data;
using (var sdp_stream = new StreamReader(new MemoryStream(message.Data))) {
sdp_data = 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 video = (sdp_data.Medias [x].MediaType == Mictlanix.DotNet.Rtsp.Sdp.Media.MediaTypes.video);
if (video && video_payload != -1)
{
continue; // have already matched an video payload
}
if (video)
{
// search the attributes for control, rtpmap and fmtp
// (fmtp only applies to video)
string control = ""; // the "track" or "stream id"
Sdp.FmtpAttribute fmtp = null; // holds SPS and PPS in base64 (h264 video)
foreach (var attrib in sdp_data.Medias[x].Attributs)
{
if (attrib.Key.Equals("control"))
{
string sdp_control = attrib.Value;
if (sdp_control.ToLower().StartsWith("rtsp://", StringComparison.Ordinal))
{
control = sdp_control; //absolute path
}
else if (message.Headers.ContainsKey(RtspHeaderNames.ContentBase))
{
control = message.Headers [RtspHeaderNames.ContentBase] + sdp_control; // relative path
}
else
{
control = Url + "/" + sdp_control; // relative path
}
}
if (attrib.Key.Equals("fmtp"))
{
fmtp = attrib as Sdp.FmtpAttribute;
}
if (attrib.Key.Equals("rtpmap"))
{
var rtpmap = attrib as Sdp.RtpMapAttribute;
// Check if the Codec Used (EncodingName) is one we support
string [] valid_video_codecs = { "H264" };
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 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 = 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];
ParameterSetsReceived?.Invoke(sps, pps);
}
}
// Send the SETUP RTSP command if we have a matching Payload Decoder
if (video && video_payload == -1)
{
continue;
}
// Server interleaves the RTP packets over the RTSP connection
// TCP mode (RTP over RTSP) Transport: RTP/AVP/TCP;interleaved=0-1
video_data_channel = 0;
video_rtcp_channel = 1;
var transport = new RtspTransport()
{
LowerTransport = RtspTransport.LowerTransportType.TCP,
Interleaved = new PortCouple(video_data_channel, video_rtcp_channel), // Eg Channel 0 for video. Channel 1 for RTCP status reports
};
// Send SETUP
var setup_message = new 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);
}
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 RtspRequestSetup)
{
// Got Reply to SETUP
if (!message.IsOk)
{
logger.Warn("Got Error in SETUP Reply " + message.ReturnCode + " " + message.ReturnMessage);
return;
}
//logger.Debug ("Got reply from SETUP Session=" + message.Session);
RtspSession = message.Session; // Session value used with Play, Pause, Teardown
// Send PLAY
RtspRequest play_message = new RtspRequestPlay();
play_message.RtspUri = new Uri(Url);
play_message.Session = RtspSession;
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 RtspRequestPlay)
{
// Got Reply to PLAY
if (!message.IsOk)
{
logger.Warn("Got Error in PLAY Reply " + message.ReturnCode + " " + message.ReturnMessage);
return;
}
//logger.Debug ("Got reply from PLAY " + message.Command);
}
}
private void MessageReceived(object sender, RtspChunkEventArgs e)
{
RtspResponse message = e.Message as RtspResponse;
// If we get a reply to OPTIONS then start the Keepalive Timer and send DESCRIBE
if (message.OriginalRequest != null && message.OriginalRequest is RtspRequestOptions)
{
// Start a Timer to send an Keepalive RTSP command every 20 seconds
_keepaliveTimer = new Timer();
_keepaliveTimer.Elapsed += SendKeepalive;
_keepaliveTimer.Interval = 20 * 1000;
_keepaliveTimer.Enabled = true;
// Send DESCRIBE
RtspRequest describe_message = new RtspRequestDescribe();
describe_message.RtspUri = new Uri(_url);
_client.SendMessage(describe_message);
}
if (message.OriginalRequest != null && message.OriginalRequest is RtspRequestDescribe)
{
Rtsp.Sdp.SdpFile sdp_data;
using (StreamReader sdp_stream = new StreamReader(new MemoryStream(message.Data)))
{
sdp_data = Rtsp.Sdp.SdpFile.Read(sdp_stream);
}
Uri video_uri = null;
foreach (Rtsp.Sdp.Attribut attrib in sdp_data.Medias[0].Attributs)
{
if (attrib.Key.Equals("control"))
{
video_uri = new Uri(attrib.Value);
}
}
RtspTransport transport = new RtspTransport()
{
LowerTransport = RtspTransport.LowerTransportType.TCP,
Interleaved = new PortCouple(0, 1),
};
// Generate SETUP messages
RtspRequestSetup setup_message = new RtspRequestSetup();
setup_message.RtspUri = video_uri;
setup_message.AddTransport(transport);
_client.SendMessage(setup_message);
}
if (message.OriginalRequest != null && message.OriginalRequest is RtspRequestSetup)
{
if (message.Timeout > 0 && message.Timeout > _keepaliveTimer.Interval / 1000)
{
_keepaliveTimer.Interval = message.Timeout * 1000 / 2;
}
// Send PLAY
RtspRequest play_message = new RtspRequestPlay();
play_message.RtspUri = new Uri(_url);
play_message.Session = message.Session;
_client.SendMessage(play_message);
}
}