/// <summary> /// Creates a new RTP session. The synchronisation source and sequence number are initialised to /// pseudo random values. /// </summary> /// <param name="formatTypeID">The format type ID for the media. It's what gets set in the payload /// type ID field in the RTP header. A default media announcement will be created.</param> /// <param name="srtpProtect">Optional secure DTLS context for encrypting RTP packets.</param> /// <param name="srtcpProtect">Optional secure DTLS context for encrypting RTCP packets.</param> /// <param name="rtpEventSupport">True if RTP event sending and receiving should be supported.</param> /// <param name="addrFamily">Determines whether the RTP channel will use an IPv4 or IPv6 socket.</param> public RTPSession(int formatTypeID, ProtectRtpPacket srtpProtect, ProtectRtpPacket srtcpProtect, bool rtpEventSupport, AddressFamily addrFamily) { MediaFormat = new SDPMediaFormat(formatTypeID); MediaAnnouncement = new SDPMediaAnnouncement { Media = SDPMediaTypesEnum.audio, MediaFormats = new List <SDPMediaFormat> { MediaFormat }, MediaStreamStatus = MediaStreamStatusEnum.SendRecv }; if (rtpEventSupport) { int clockRate = MediaFormat.GetClockRate(); SDPMediaFormat rtpEventFormat = new SDPMediaFormat(DTMF_EVENT_PAYLOAD_ID); rtpEventFormat.SetFormatAttribute($"{TELEPHONE_EVENT_ATTRIBUTE}/{clockRate}"); rtpEventFormat.SetFormatParameterAttribute("0-16"); MediaAnnouncement.MediaFormats.Add(rtpEventFormat); } m_rtpEventSupport = rtpEventSupport; FormatTypeID = formatTypeID; SrtpProtect = srtpProtect; Initialise(addrFamily, srtcpProtect); }
/// <summary> /// Adds an additional RTP stream to this session. The effect of this is to multiplex /// two or more RTP sessions on a single socket. Multiplexing is used by WebRTC. /// </summary> /// <param name="payloadTypeID">The payload type ID for this RTP stream. It's what gets set in the payload /// type ID field in the RTP header.</param> /// <returns>The ID of the stream of this media type. It must be supplied when /// doing a send for this stream.</returns> public int AddStream(int payloadTypeID, SDPMediaAnnouncement mediaAnnouncement) { int nextID = m_sessionStreams.OrderByDescending(x => x.ID).First().ID + 1; var sessionStream = new RTPSessionStream(nextID, payloadTypeID); m_sessionStreams.Add(sessionStream); return(sessionStream.ID); }
/// <summary> /// Generates the base SDP for an offer or answer. The SDP will then be tailored depending /// on whether it's being used in an offer or an answer. /// </summary> /// <param name="audioCapabilities">Optional. The audio formats to support in the SDP. This list can differ from /// the local audio track if an answer is being generated and only mutually supported formats are being /// used.</param> /// <param name="videoCapabilities">Optional. The video formats to support in the SDP. This list can differ from /// the local video track if an answer is being generated and only mutually supported formats are being /// used.</param> /// <remarks> /// From https://tools.ietf.org/html/draft-ietf-mmusic-ice-sip-sdp-39#section-4.2.5: /// "The transport address from the peer for the default destination /// is set to IPv4/IPv6 address values "0.0.0.0"/"::" and port value /// of "9". This MUST NOT be considered as a ICE failure by the peer /// agent and the ICE processing MUST continue as usual." /// </remarks> private SDP createBaseSdp(List <MediaStreamTrack> tracks, List <SDPMediaFormat> audioCapabilities, List <SDPMediaFormat> videoCapabilities) { SDP offerSdp = new SDP(IPAddress.Loopback); offerSdp.SessionId = LocalSdpSessionID; bool iceCandidatesAdded = false; // Add a bundle attribute. Indicates that audio and video sessions will be multiplexed // on a single RTP socket. offerSdp.Group = BUNDLE_ATTRIBUTE; offerSdp.DtlsFingerprint = _currentCertificate.getFingerprints().First().ToString(); // Media announcements must be in the same order in the offer and answer. foreach (var track in tracks.OrderBy(x => x.MLineIndex)) { offerSdp.Group += $" {track.MID}"; SDPMediaAnnouncement announcement = new SDPMediaAnnouncement( track.Kind, SDP.IGNORE_RTP_PORT_NUMBER, (track.Kind == SDPMediaTypesEnum.video) ? videoCapabilities : audioCapabilities); announcement.Transport = RTP_MEDIA_PROFILE; announcement.Connection = new SDPConnectionInformation(IPAddress.Any); announcement.AddExtra(RTCP_MUX_ATTRIBUTE); announcement.AddExtra(RTCP_ATTRIBUTE); announcement.MediaStreamStatus = track.StreamStatus; announcement.MediaID = track.MID; announcement.IceUfrag = _rtpIceChannel.LocalIceUser; announcement.IcePwd = _rtpIceChannel.LocalIcePassword; announcement.IceOptions = ICE_OPTIONS; announcement.DtlsFingerprint = offerSdp.DtlsFingerprint; if (iceCandidatesAdded == false && _rtpIceChannel.Candidates?.Count > 0) { announcement.IceCandidates = new List <string>(); // Add ICE candidates. foreach (var iceCandidate in _rtpIceChannel.Candidates) { announcement.IceCandidates.Add(iceCandidate.ToString()); } iceCandidatesAdded = true; } offerSdp.Media.Add(announcement); } return(offerSdp); }
/// <summary> /// Gets an SDP packet that can be used by VoIP clients to negotiate an audio connection. The SDP will only /// offer PCMU since that's all I've gotten around to handling. /// </summary> /// <param name="usePublicIP">If true and the public IP address is available from the STUN client then /// the public IP address will be used in the SDP otherwise the host machine's default IPv4 address will /// be used.</param> /// <returns>An SDP packet that can be used by a VoIP client when initiating a call.</returns> public SDP GetSDP(bool usePublicIP) { IPAddress rtpIPAddress = (usePublicIP && SoftphoneSTUNClient.PublicIPAddress != null) ? SoftphoneSTUNClient.PublicIPAddress : _defaultLocalAddress; var sdp = new SDP() { SessionId = Crypto.GetRandomInt(5).ToString(), Address = rtpIPAddress.ToString(), SessionName = "sipsorcery", Timing = "0 0", Connection = new SDPConnectionInformation(rtpIPAddress.ToString()), }; if (_rtpAudioChannel != null) { var audioAnnouncement = new SDPMediaAnnouncement() { Media = SDPMediaTypesEnum.audio, MediaFormats = new List<SDPMediaFormat>() { new SDPMediaFormat((int)SDPMediaFormatsEnum.PCMU, "PCMU", 8000) } }; audioAnnouncement.Port = _rtpAudioChannel.RTPPort; sdp.Media.Add(audioAnnouncement); } if (_rtpVideoChannel != null) { var videoAnnouncement = new SDPMediaAnnouncement() { Media = SDPMediaTypesEnum.video, MediaFormats = new List<SDPMediaFormat>() { new SDPMediaFormat(96, "VP8", 90000) } }; videoAnnouncement.Port = _rtpVideoChannel.RTPPort; sdp.Media.Add(videoAnnouncement); } return sdp; }
public static SDP ParseSDPDescription(string sdpDescription) { try { if (sdpDescription != null && sdpDescription.Trim().Length > 0) { SDP sdp = new SDP(); sdp.m_rawSdp = sdpDescription; SDPMediaAnnouncement activeAnnouncement = null; string[] sdpLines = Regex.Split(sdpDescription, CRLF); foreach (string sdpLine in sdpLines) { string sdpLineTrimmed = sdpLine.Trim(); if (sdpLineTrimmed.StartsWith("v=")) { if (!Decimal.TryParse(sdpLineTrimmed.Substring(2), out sdp.Version)) { logger.LogWarning( "The Version value in an SDP description could not be parsed as a decimal: " + sdpLine + "."); } } else if (sdpLineTrimmed.StartsWith("o=")) { string[] ownerFields = sdpLineTrimmed.Substring(2).Split(' '); sdp.Username = ownerFields[0]; sdp.SessionId = ownerFields[1]; Int32.TryParse(ownerFields[2], out sdp.AnnouncementVersion); sdp.NetworkType = ownerFields[3]; sdp.AddressType = ownerFields[4]; sdp.AddressOrHost = ownerFields[5]; } else if (sdpLineTrimmed.StartsWith("s=")) { sdp.SessionName = sdpLineTrimmed.Substring(2); } else if (sdpLineTrimmed.StartsWith("c=")) { if (sdp.Connection == null) { sdp.Connection = SDPConnectionInformation.ParseConnectionInformation(sdpLineTrimmed); } if (activeAnnouncement != null) { activeAnnouncement.Connection = SDPConnectionInformation.ParseConnectionInformation(sdpLineTrimmed); } } else if (sdpLineTrimmed.StartsWith("b=")) { if (activeAnnouncement != null) { activeAnnouncement.BandwidthAttributes.Add(sdpLineTrimmed.Substring(2)); } else { sdp.BandwidthAttributes.Add(sdpLineTrimmed.Substring(2)); } } else if (sdpLineTrimmed.StartsWith("t=")) { sdp.Timing = sdpLineTrimmed.Substring(2); } else if (sdpLineTrimmed.StartsWith("m=")) { Match mediaMatch = Regex.Match(sdpLineTrimmed.Substring(2), @"(?<type>\w+)\s+(?<port>\d+)\s+(?<transport>\S+)(\s*)(?<formats>.*)$"); if (mediaMatch.Success) { SDPMediaAnnouncement announcement = new SDPMediaAnnouncement(); announcement.Media = SDPMediaTypes.GetSDPMediaType(mediaMatch.Result("${type}")); Int32.TryParse(mediaMatch.Result("${port}"), out announcement.Port); announcement.Transport = mediaMatch.Result("${transport}"); announcement.ParseMediaFormats(mediaMatch.Result("${formats}")); sdp.Media.Add(announcement); activeAnnouncement = announcement; } else { logger.LogWarning("A media line in SDP was invalid: " + sdpLineTrimmed.Substring(2) + "."); } } else if (sdpLineTrimmed.StartsWith("a=" + GROUP_ATRIBUTE_PREFIX)) { sdp.Group = sdpLineTrimmed.Substring(sdpLineTrimmed.IndexOf(':') + 1); } else if (sdpLineTrimmed.StartsWith("a=" + ICE_UFRAG_ATTRIBUTE_PREFIX)) { if (activeAnnouncement != null) { activeAnnouncement.IceUfrag = sdpLineTrimmed.Substring(sdpLineTrimmed.IndexOf(':') + 1); } else { sdp.IceUfrag = sdpLineTrimmed.Substring(sdpLineTrimmed.IndexOf(':') + 1); } } else if (sdpLineTrimmed.StartsWith("a=" + ICE_PWD_ATTRIBUTE_PREFIX)) { if (activeAnnouncement != null) { activeAnnouncement.IcePwd = sdpLineTrimmed.Substring(sdpLineTrimmed.IndexOf(':') + 1); } else { sdp.IcePwd = sdpLineTrimmed.Substring(sdpLineTrimmed.IndexOf(':') + 1); } } else if (sdpLineTrimmed.StartsWith("a=" + DTLS_FINGERPRINT_ATTRIBUTE_PREFIX)) { if (activeAnnouncement != null) { activeAnnouncement.DtlsFingerprint = sdpLineTrimmed.Substring(sdpLineTrimmed.IndexOf(':') + 1); } else { sdp.DtlsFingerprint = sdpLineTrimmed.Substring(sdpLineTrimmed.IndexOf(':') + 1); } } else if (sdpLineTrimmed.StartsWith($"a={END_ICE_CANDIDATES_ATTRIBUTE}")) { // Do nothing. } else if (sdpLineTrimmed.StartsWith(SDPMediaAnnouncement.MEDIA_FORMAT_ATTRIBUE_PREFIX)) { if (activeAnnouncement != null) { Match formatAttributeMatch = Regex.Match(sdpLineTrimmed, SDPMediaAnnouncement.MEDIA_FORMAT_ATTRIBUE_PREFIX + @"(?<id>\d+)\s+(?<attribute>.*)$"); if (formatAttributeMatch.Success) { int formatID; if (Int32.TryParse(formatAttributeMatch.Result("${id}"), out formatID)) { activeAnnouncement.AddFormatAttribute(formatID, formatAttributeMatch.Result("${attribute}")); } else { logger.LogWarning("Invalid media format attribute in SDP: " + sdpLine); } } else { activeAnnouncement.AddExtra(sdpLineTrimmed); } } else { logger.LogWarning( "There was no active media announcement for a media format attribute, ignoring."); } } else if (sdpLineTrimmed.StartsWith(SDPMediaAnnouncement.MEDIA_FORMAT_PARAMETERS_ATTRIBUE_PREFIX) ) { if (activeAnnouncement != null) { Match formatAttributeMatch = Regex.Match(sdpLineTrimmed, SDPMediaAnnouncement.MEDIA_FORMAT_PARAMETERS_ATTRIBUE_PREFIX + @"(?<id>\d+)\s+(?<attribute>.*)$"); if (formatAttributeMatch.Success) { int formatID; if (Int32.TryParse(formatAttributeMatch.Result("${id}"), out formatID)) { activeAnnouncement.AddFormatParameterAttribute(formatID, formatAttributeMatch.Result("${attribute}")); } else { logger.LogWarning("Invalid media format parameter attribute in SDP: " + sdpLine); } } else { activeAnnouncement.AddExtra(sdpLineTrimmed); } } else { logger.LogWarning( "There was no active media announcement for a media format parameter attribute, ignoring."); } } else if (sdpLineTrimmed.StartsWith("a=" + ICE_CANDIDATE_ATTRIBUTE_PREFIX)) { if (activeAnnouncement != null) { if (activeAnnouncement.IceCandidates == null) { activeAnnouncement.IceCandidates = new List <string>(); } activeAnnouncement.IceCandidates.Add( sdpLineTrimmed.Substring(sdpLineTrimmed.IndexOf(':') + 1)); } else { if (sdp.IceCandidates == null) { sdp.IceCandidates = new List <string>(); } sdp.IceCandidates.Add(sdpLineTrimmed.Substring(sdpLineTrimmed.IndexOf(':') + 1)); } } //2018-12-21 rj2: add a=crypto else if (sdpLineTrimmed.StartsWith(SDPSecurityDescription.CRYPTO_ATTRIBUE_PREFIX)) { if (activeAnnouncement != null) { try { activeAnnouncement.AddCryptoLine(sdpLineTrimmed); } catch (FormatException fex) { logger.LogWarning("Error Parsing SDP-Line(a=crypto) " + fex); } } } else if (MediaStreamStatusType.IsMediaStreamStatusAttribute(sdpLine.Trim(), out var mediaStreamStatus)) { if (activeAnnouncement != null) { activeAnnouncement.MediaStreamStatus = mediaStreamStatus; } else { sdp.SessionMediaStreamStatus = mediaStreamStatus; } } else if (sdpLineTrimmed.StartsWith("a=" + MEDIA_ID_ATTRIBUTE_PREFIX)) { if (activeAnnouncement != null) { activeAnnouncement.MediaID = sdpLineTrimmed.Substring(sdpLineTrimmed.IndexOf(':') + 1); } else { logger.LogWarning("A media ID can only be set on a media announcement."); } } else if (sdpLineTrimmed.StartsWith(SDPMediaAnnouncement.MEDIA_FORMAT_SSRC_GROUP_ATTRIBUE_PREFIX) ) { if (activeAnnouncement != null) { string[] fields = sdpLineTrimmed.Substring(sdpLineTrimmed.IndexOf(':') + 1).Split(' '); // Set the ID. if (fields.Length > 0) { activeAnnouncement.SsrcGroupID = fields[0]; } // Add attributes for each of the SSRC values. for (int i = 1; i < fields.Length; i++) { if (uint.TryParse(fields[i], out var ssrc)) { activeAnnouncement.SsrcAttributes.Add( new SDPSsrcAttribute(ssrc, null, activeAnnouncement.SsrcGroupID)); } } } else { logger.LogWarning("A ssrc-group ID can only be set on a media announcement."); } } else if (sdpLineTrimmed.StartsWith(SDPMediaAnnouncement.MEDIA_FORMAT_SSRC_ATTRIBUE_PREFIX)) { if (activeAnnouncement != null) { string[] ssrcFields = sdpLineTrimmed.Substring(sdpLineTrimmed.IndexOf(':') + 1) .Split(' '); if (ssrcFields.Length > 0 && uint.TryParse(ssrcFields[0], out var ssrc)) { var ssrcAttribute = activeAnnouncement.SsrcAttributes.FirstOrDefault(x => x.SSRC == ssrc); if (ssrcAttribute == null) { ssrcAttribute = new SDPSsrcAttribute(ssrc, null, null); activeAnnouncement.SsrcAttributes.Add(ssrcAttribute); } if (ssrcFields.Length > 1) { if (ssrcFields[1].StartsWith(SDPSsrcAttribute.MEDIA_CNAME_ATTRIBUE_PREFIX)) { ssrcAttribute.Cname = ssrcFields[1].Substring(ssrcFields[1].IndexOf(':') + 1); } } } } else { logger.LogWarning("A ssrc attribute can only be set on a media announcement."); } } else { if (activeAnnouncement != null) { activeAnnouncement.AddExtra(sdpLineTrimmed); } else { sdp.AddExtra(sdpLineTrimmed); } } } return(sdp); } else { return(null); } } catch (Exception excp) { logger.LogError("Exception ParseSDPDescription. " + excp.Message); throw excp; } }
public static SDP ParseSDPDescription(string sdpDescription) { try { if (sdpDescription != null && sdpDescription.Trim().Length > 0) { SDP sdp = new SDP(); sdp.m_rawSdp = sdpDescription; int mLineIndex = 0; SDPMediaAnnouncement activeAnnouncement = null; // If a media announcement fmtp atribute is found before the rtpmap it will be stored // in this dictionary. A dynamic media format type cannot be created without an rtpmap. Dictionary <int, string> _pendingFmtp = new Dictionary <int, string>(); //string[] sdpLines = Regex.Split(sdpDescription, CRLF); string[] sdpLines = sdpDescription.Split(new string[] { "\r\n", "\r", "\n" }, StringSplitOptions.RemoveEmptyEntries); foreach (string sdpLine in sdpLines) { string sdpLineTrimmed = sdpLine.Trim(); switch (sdpLineTrimmed) { case var l when l.StartsWith("v="): if (!Decimal.TryParse(sdpLineTrimmed.Substring(2), out sdp.Version)) { logger.LogWarning("The Version value in an SDP description could not be parsed as a decimal: " + sdpLine + "."); } break; case var l when l.StartsWith("o="): string[] ownerFields = sdpLineTrimmed.Substring(2).Split(' '); sdp.Username = ownerFields[0]; sdp.SessionId = ownerFields[1]; Int32.TryParse(ownerFields[2], out sdp.AnnouncementVersion); sdp.NetworkType = ownerFields[3]; sdp.AddressType = ownerFields[4]; sdp.AddressOrHost = ownerFields[5]; break; case var l when l.StartsWith("s="): sdp.SessionName = sdpLineTrimmed.Substring(2); break; case var l when l.StartsWith("i="): if (activeAnnouncement != null) { activeAnnouncement.MediaDescription = sdpLineTrimmed.Substring(2); } else { sdp.SessionDescription = sdpLineTrimmed.Substring(2); } break; case var l when l.StartsWith("c="): if (activeAnnouncement != null) { activeAnnouncement.Connection = SDPConnectionInformation.ParseConnectionInformation(sdpLineTrimmed); } else if (sdp.Connection == null) { sdp.Connection = SDPConnectionInformation.ParseConnectionInformation(sdpLineTrimmed); } else { logger.LogWarning("The SDP message had a duplicate connection attribute which was ignored."); } break; case var l when l.StartsWith("b="): if (activeAnnouncement != null) { if (l.StartsWith(SDPMediaAnnouncement.TIAS_BANDWIDTH_ATTRIBUE_PREFIX)) { if (uint.TryParse(l.Substring(l.IndexOf(':') + 1), out uint tias)) { activeAnnouncement.TIASBandwidth = tias; } } else { activeAnnouncement.BandwidthAttributes.Add(sdpLineTrimmed.Substring(2)); } } else { sdp.BandwidthAttributes.Add(sdpLineTrimmed.Substring(2)); } break; case var l when l.StartsWith("t="): sdp.Timing = sdpLineTrimmed.Substring(2); break; case var l when l.StartsWith("m="): Match mediaMatch = Regex.Match(sdpLineTrimmed.Substring(2), @"(?<type>\w+)\s+(?<port>\d+)\s+(?<transport>\S+)(\s*)(?<formats>.*)$"); if (mediaMatch.Success) { SDPMediaAnnouncement announcement = new SDPMediaAnnouncement(); announcement.MLineIndex = mLineIndex; announcement.Media = SDPMediaTypes.GetSDPMediaType(mediaMatch.Result("${type}")); Int32.TryParse(mediaMatch.Result("${port}"), out announcement.Port); announcement.Transport = mediaMatch.Result("${transport}"); announcement.ParseMediaFormats(mediaMatch.Result("${formats}")); if (announcement.Media == SDPMediaTypesEnum.audio || announcement.Media == SDPMediaTypesEnum.video) { announcement.MediaStreamStatus = sdp.SessionMediaStreamStatus != null ? sdp.SessionMediaStreamStatus.Value : MediaStreamStatusEnum.SendRecv; } sdp.Media.Add(announcement); activeAnnouncement = announcement; } else { logger.LogWarning("A media line in SDP was invalid: " + sdpLineTrimmed.Substring(2) + "."); } mLineIndex++; break; case var x when x.StartsWith($"a={GROUP_ATRIBUTE_PREFIX}"): sdp.Group = sdpLineTrimmed.Substring(sdpLineTrimmed.IndexOf(':') + 1); break; case var x when x.StartsWith($"a={ICE_UFRAG_ATTRIBUTE_PREFIX}"): if (activeAnnouncement != null) { activeAnnouncement.IceUfrag = sdpLineTrimmed.Substring(sdpLineTrimmed.IndexOf(':') + 1); } else { sdp.IceUfrag = sdpLineTrimmed.Substring(sdpLineTrimmed.IndexOf(':') + 1); } break; case var x when x.StartsWith($"a={ICE_PWD_ATTRIBUTE_PREFIX}"): if (activeAnnouncement != null) { activeAnnouncement.IcePwd = sdpLineTrimmed.Substring(sdpLineTrimmed.IndexOf(':') + 1); } else { sdp.IcePwd = sdpLineTrimmed.Substring(sdpLineTrimmed.IndexOf(':') + 1); } break; case var x when x.StartsWith($"a={ICE_SETUP_ATTRIBUTE_PREFIX}"): int colonIndex = sdpLineTrimmed.IndexOf(':'); if (colonIndex != -1 && sdpLineTrimmed.Length > colonIndex) { string iceRoleStr = sdpLineTrimmed.Substring(colonIndex + 1).Trim(); if (Enum.TryParse <IceRolesEnum>(iceRoleStr, true, out var iceRole)) { if (activeAnnouncement != null) { activeAnnouncement.IceRole = iceRole; } else { sdp.IceRole = iceRole; } } else { logger.LogWarning($"ICE role was not recognised from SDP attribute: {sdpLineTrimmed}."); } } else { logger.LogWarning($"ICE role SDP attribute was missing the mandatory colon: {sdpLineTrimmed}."); } break; case var x when x.StartsWith($"a={DTLS_FINGERPRINT_ATTRIBUTE_PREFIX}"): if (activeAnnouncement != null) { activeAnnouncement.DtlsFingerprint = sdpLineTrimmed.Substring(sdpLineTrimmed.IndexOf(':') + 1); } else { sdp.DtlsFingerprint = sdpLineTrimmed.Substring(sdpLineTrimmed.IndexOf(':') + 1); } break; case var x when x.StartsWith($"a={ICE_CANDIDATE_ATTRIBUTE_PREFIX}"): if (activeAnnouncement != null) { if (activeAnnouncement.IceCandidates == null) { activeAnnouncement.IceCandidates = new List <string>(); } activeAnnouncement.IceCandidates.Add(sdpLineTrimmed.Substring(sdpLineTrimmed.IndexOf(':') + 1)); } else { if (sdp.IceCandidates == null) { sdp.IceCandidates = new List <string>(); } sdp.IceCandidates.Add(sdpLineTrimmed.Substring(sdpLineTrimmed.IndexOf(':') + 1)); } break; case var x when x == $"a={END_ICE_CANDIDATES_ATTRIBUTE}": // TODO: Set a flag. break; case var l when l.StartsWith(SDPMediaAnnouncement.MEDIA_FORMAT_ATTRIBUE_PREFIX): if (activeAnnouncement != null) { if (activeAnnouncement.Media == SDPMediaTypesEnum.audio || activeAnnouncement.Media == SDPMediaTypesEnum.video) { // Parse the rtpmap attribute for audio/video announcements. Match formatAttributeMatch = Regex.Match(sdpLineTrimmed, SDPMediaAnnouncement.MEDIA_FORMAT_ATTRIBUE_PREFIX + @"(?<id>\d+)\s+(?<attribute>.*)$"); if (formatAttributeMatch.Success) { string formatID = formatAttributeMatch.Result("${id}"); string rtpmap = formatAttributeMatch.Result("${attribute}"); if (Int32.TryParse(formatID, out int id)) { if (activeAnnouncement.MediaFormats.ContainsKey(id)) { activeAnnouncement.MediaFormats[id] = activeAnnouncement.MediaFormats[id].WithUpdatedRtpmap(rtpmap, activeAnnouncement.MediaFormats[id]); } else { string fmtp = _pendingFmtp.ContainsKey(id) ? _pendingFmtp[id] : null; activeAnnouncement.MediaFormats.Add(id, new SDPAudioVideoMediaFormat(activeAnnouncement.Media, id, rtpmap, fmtp)); } } else { logger.LogWarning("Non-numeric audio/video media format attribute in SDP: " + sdpLine); } } else { activeAnnouncement.AddExtra(sdpLineTrimmed); } } else { // Parse the rtpmap attribute for NON audio/video announcements. Match formatAttributeMatch = Regex.Match(sdpLineTrimmed, SDPMediaAnnouncement.MEDIA_FORMAT_ATTRIBUE_PREFIX + @"(?<id>\S+)\s+(?<attribute>.*)$"); if (formatAttributeMatch.Success) { string formatID = formatAttributeMatch.Result("${id}"); string rtpmap = formatAttributeMatch.Result("${attribute}"); if (activeAnnouncement.ApplicationMediaFormats.ContainsKey(formatID)) { activeAnnouncement.ApplicationMediaFormats[formatID] = activeAnnouncement.ApplicationMediaFormats[formatID].WithUpdatedRtpmap(rtpmap); } else { activeAnnouncement.ApplicationMediaFormats.Add(formatID, new SDPApplicationMediaFormat(formatID, rtpmap, null)); } } else { activeAnnouncement.AddExtra(sdpLineTrimmed); } } } else { logger.LogWarning("There was no active media announcement for a media format attribute, ignoring."); } break; case var l when l.StartsWith(SDPMediaAnnouncement.MEDIA_FORMAT_PARAMETERS_ATTRIBUE_PREFIX): if (activeAnnouncement != null) { if (activeAnnouncement.Media == SDPMediaTypesEnum.audio || activeAnnouncement.Media == SDPMediaTypesEnum.video) { // Parse the fmtp attribute for audio/video announcements. Match formatAttributeMatch = Regex.Match(sdpLineTrimmed, SDPMediaAnnouncement.MEDIA_FORMAT_PARAMETERS_ATTRIBUE_PREFIX + @"(?<id>\d+)\s+(?<attribute>.*)$"); if (formatAttributeMatch.Success) { string avFormatID = formatAttributeMatch.Result("${id}"); string fmtp = formatAttributeMatch.Result("${attribute}"); if (Int32.TryParse(avFormatID, out int id)) { if (activeAnnouncement.MediaFormats.ContainsKey(id)) { activeAnnouncement.MediaFormats[id] = activeAnnouncement.MediaFormats[id].WithUpdatedFmtp(fmtp, activeAnnouncement.MediaFormats[id]); } else { // Store the fmtp attribute for use when the rtpmap attribute turns up. if (_pendingFmtp.ContainsKey(id)) { _pendingFmtp.Remove(id); } _pendingFmtp.Add(id, fmtp); } } else { logger.LogWarning("Invalid media format parameter attribute in SDP: " + sdpLine); } } else { activeAnnouncement.AddExtra(sdpLineTrimmed); } } else { // Parse the fmtp attribute for NON audio/video announcements. Match formatAttributeMatch = Regex.Match(sdpLineTrimmed, SDPMediaAnnouncement.MEDIA_FORMAT_PARAMETERS_ATTRIBUE_PREFIX + @"(?<id>\S+)\s+(?<attribute>.*)$"); if (formatAttributeMatch.Success) { string formatID = formatAttributeMatch.Result("${id}"); string fmtp = formatAttributeMatch.Result("${attribute}"); if (activeAnnouncement.ApplicationMediaFormats.ContainsKey(formatID)) { activeAnnouncement.ApplicationMediaFormats[formatID] = activeAnnouncement.ApplicationMediaFormats[formatID].WithUpdatedFmtp(fmtp); } else { activeAnnouncement.ApplicationMediaFormats.Add(formatID, new SDPApplicationMediaFormat(formatID, null, fmtp)); } } else { activeAnnouncement.AddExtra(sdpLineTrimmed); } } } else { logger.LogWarning("There was no active media announcement for a media format parameter attribute, ignoring."); } break; case var l when l.StartsWith(SDPSecurityDescription.CRYPTO_ATTRIBUE_PREFIX): //2018-12-21 rj2: add a=crypto if (activeAnnouncement != null) { try { activeAnnouncement.AddCryptoLine(sdpLineTrimmed); } catch (FormatException fex) { logger.LogWarning("Error Parsing SDP-Line(a=crypto) " + fex); } } break; case var x when x.StartsWith($"a={MEDIA_ID_ATTRIBUTE_PREFIX}"): if (activeAnnouncement != null) { activeAnnouncement.MediaID = sdpLineTrimmed.Substring(sdpLineTrimmed.IndexOf(':') + 1); } else { logger.LogWarning("A media ID can only be set on a media announcement."); } break; case var l when l.StartsWith(SDPMediaAnnouncement.MEDIA_FORMAT_SSRC_GROUP_ATTRIBUE_PREFIX): if (activeAnnouncement != null) { string[] fields = sdpLineTrimmed.Substring(sdpLineTrimmed.IndexOf(':') + 1).Split(' '); // Set the ID. if (fields.Length > 0) { activeAnnouncement.SsrcGroupID = fields[0]; } // Add attributes for each of the SSRC values. for (int i = 1; i < fields.Length; i++) { if (uint.TryParse(fields[i], out var ssrc)) { activeAnnouncement.SsrcAttributes.Add(new SDPSsrcAttribute(ssrc, null, activeAnnouncement.SsrcGroupID)); } } } else { logger.LogWarning("A ssrc-group ID can only be set on a media announcement."); } break; case var l when l.StartsWith(SDPMediaAnnouncement.MEDIA_FORMAT_SSRC_ATTRIBUE_PREFIX): if (activeAnnouncement != null) { string[] ssrcFields = sdpLineTrimmed.Substring(sdpLineTrimmed.IndexOf(':') + 1).Split(' '); if (ssrcFields.Length > 0 && uint.TryParse(ssrcFields[0], out var ssrc)) { var ssrcAttribute = activeAnnouncement.SsrcAttributes.FirstOrDefault(x => x.SSRC == ssrc); if (ssrcAttribute == null) { ssrcAttribute = new SDPSsrcAttribute(ssrc, null, null); activeAnnouncement.SsrcAttributes.Add(ssrcAttribute); } if (ssrcFields.Length > 1) { if (ssrcFields[1].StartsWith(SDPSsrcAttribute.MEDIA_CNAME_ATTRIBUE_PREFIX)) { ssrcAttribute.Cname = ssrcFields[1].Substring(ssrcFields[1].IndexOf(':') + 1); } } } } else { logger.LogWarning("An ssrc attribute can only be set on a media announcement."); } break; case var x when MediaStreamStatusType.IsMediaStreamStatusAttribute(x, out var mediaStreamStatus): if (activeAnnouncement != null) { activeAnnouncement.MediaStreamStatus = mediaStreamStatus; } else { sdp.SessionMediaStreamStatus = mediaStreamStatus; } break; case var l when l.StartsWith(SDPMediaAnnouncement.MEDIA_FORMAT_SCTP_MAP_ATTRIBUE_PREFIX): if (activeAnnouncement != null) { activeAnnouncement.SctpMap = sdpLineTrimmed.Substring(sdpLineTrimmed.IndexOf(':') + 1); (var sctpPortStr, _, var maxMessageSizeStr) = activeAnnouncement.SctpMap.Split(' '); if (ushort.TryParse(sctpPortStr, out var sctpPort)) { activeAnnouncement.SctpPort = sctpPort; } else { logger.LogWarning($"An sctp-port value of {sctpPortStr} was not recognised as a valid port."); } if (!long.TryParse(maxMessageSizeStr, out activeAnnouncement.MaxMessageSize)) { logger.LogWarning($"A max-message-size value of {maxMessageSizeStr} was not recognised as a valid long."); } } else { logger.LogWarning("An sctpmap attribute can only be set on a media announcement."); } break; case var l when l.StartsWith(SDPMediaAnnouncement.MEDIA_FORMAT_SCTP_PORT_ATTRIBUE_PREFIX): if (activeAnnouncement != null) { string sctpPortStr = sdpLineTrimmed.Substring(sdpLineTrimmed.IndexOf(':') + 1); if (ushort.TryParse(sctpPortStr, out var sctpPort)) { activeAnnouncement.SctpPort = sctpPort; } else { logger.LogWarning($"An sctp-port value of {sctpPortStr} was not recognised as a valid port."); } } else { logger.LogWarning("An sctp-port attribute can only be set on a media announcement."); } break; case var l when l.StartsWith(SDPMediaAnnouncement.MEDIA_FORMAT_MAX_MESSAGE_SIZE_ATTRIBUE_PREFIX): if (activeAnnouncement != null) { string maxMessageSizeStr = sdpLineTrimmed.Substring(sdpLineTrimmed.IndexOf(':') + 1); if (!long.TryParse(maxMessageSizeStr, out activeAnnouncement.MaxMessageSize)) { logger.LogWarning($"A max-message-size value of {maxMessageSizeStr} was not recognised as a valid long."); } } else { logger.LogWarning("A max-message-size attribute can only be set on a media announcement."); } break; case var l when l.StartsWith(SDPMediaAnnouncement.MEDIA_FORMAT_PATH_ACCEPT_TYPES_PREFIX): if (activeAnnouncement != null) { string acceptTypesStr = sdpLineTrimmed.Substring(sdpLineTrimmed.IndexOf(':') + 1); var acceptTypesList = acceptTypesStr.Trim().Split(' ').ToList(); activeAnnouncement.MessageMediaFormat.AcceptTypes = acceptTypesList; } else { logger.LogWarning("A accept-types attribute can only be set on a media announcement."); } break; case var l when l.StartsWith(SDPMediaAnnouncement.MEDIA_FORMAT_PATH_MSRP_PREFIX): if (activeAnnouncement != null) { string pathStr = sdpLineTrimmed.Substring(sdpLineTrimmed.IndexOf(':') + 1); string pathTrimmedStr = pathStr.Substring(pathStr.IndexOf(':') + 3); activeAnnouncement.MessageMediaFormat.IP = pathTrimmedStr.Substring(0, pathTrimmedStr.IndexOf(':')); pathTrimmedStr = pathTrimmedStr.Substring(pathTrimmedStr.IndexOf(':') + 1); activeAnnouncement.MessageMediaFormat.Port = pathTrimmedStr.Substring(0, pathTrimmedStr.IndexOf('/')); pathTrimmedStr = pathTrimmedStr.Substring(pathTrimmedStr.IndexOf('/') + 1); activeAnnouncement.MessageMediaFormat.Endpoint = pathTrimmedStr; } else { logger.LogWarning("A path attribute can only be set on a media announcement."); } break; default: if (activeAnnouncement != null) { activeAnnouncement.AddExtra(sdpLineTrimmed); } else { sdp.AddExtra(sdpLineTrimmed); } break; } } return(sdp); } else { return(null); } } catch (Exception excp) { logger.LogError("Exception ParseSDPDescription. " + excp.Message); throw; } }
public static SDP ParseSDPDescription(string sdpDescription) { try { if (sdpDescription != null && sdpDescription.Trim().Length > 0) { SDP sdp = new SDP(); SDPMediaAnnouncement activeAnnouncement = null; string[] sdpLines = Regex.Split(sdpDescription, CRLF); foreach (string sdpLine in sdpLines) { if (sdpLine.Trim().StartsWith("v=")) { if (!Decimal.TryParse(sdpLine.Substring(2), out sdp.Version)) { logger.Warn("The Version value in an SDP description could not be parsed as a decimal: " + sdpLine + "."); } } else if (sdpLine.Trim().StartsWith("o=")) { string[] ownerFields = sdpLine.Substring(2).Split(' '); sdp.Username = ownerFields[0]; sdp.SessionId = ownerFields[1]; Int32.TryParse(ownerFields[2], out sdp.AnnouncementVersion); sdp.NetworkType = ownerFields[3]; sdp.AddressType = ownerFields[4]; sdp.Address = ownerFields[5]; } else if (sdpLine.Trim().StartsWith("s=")) { sdp.SessionName = sdpLine.Substring(2); } else if (sdpLine.Trim().StartsWith("c=")) { if(activeAnnouncement != null) activeAnnouncement.Connection = SDPConnectionInformation.ParseConnectionInformation(sdpLine); else sdp.Connection = SDPConnectionInformation.ParseConnectionInformation(sdpLine); } else if(sdpLine.Trim().StartsWith("b=")) { if(activeAnnouncement != null) activeAnnouncement.BandwidthAttributes.Add(sdpLine.Substring(2)); else sdp.BandwidthAttributes.Add(sdpLine.Substring(2)); } else if (sdpLine.Trim().StartsWith("t=")) { sdp.Timing = sdpLine.Substring(2); } else if (sdpLine.Trim().StartsWith("m=")) { Match mediaMatch = Regex.Match(sdpLine.Substring(2).Trim(), @"(?<type>\w+)\s+(?<port>\d+)\s+(?<transport>\S+)\s+(?<formats>.*)$"); if (mediaMatch.Success) { SDPMediaAnnouncement announcement = new SDPMediaAnnouncement(); announcement.Media = SDPMediaTypes.GetSDPMediaType(mediaMatch.Result("${type}")); Int32.TryParse(mediaMatch.Result("${port}"), out announcement.Port); announcement.Transport = mediaMatch.Result("${transport}"); announcement.ParseMediaFormats(mediaMatch.Result("${formats}")); sdp.Media.Add(announcement); activeAnnouncement = announcement; } else { logger.Warn("A media line in SDP was invalid: " + sdpLine.Substring(2) + "."); } } else if (sdpLine.Trim().StartsWith("a=" + ICE_UFRAG_ATTRIBUTE_PREFIX)) { sdp.IceUfrag = sdpLine.Substring(sdpLine.IndexOf(':') + 1); } else if (sdpLine.Trim().StartsWith("a=" + ICE_PWD_ATTRIBUTE_PREFIX)) { sdp.IcePwd = sdpLine.Substring(sdpLine.IndexOf(':') + 1); } else if (sdpLine.Trim().StartsWith(SDPMediaAnnouncement.MEDIA_FORMAT_ATTRIBUE_PREFIX)) { if (activeAnnouncement != null) { Match formatAttributeMatch = Regex.Match(sdpLine.Trim(), SDPMediaAnnouncement.MEDIA_FORMAT_ATTRIBUE_PREFIX + @"(?<id>\d+)\s+(?<attribute>.*)$"); if (formatAttributeMatch.Success) { int formatID; if (Int32.TryParse(formatAttributeMatch.Result("${id}"), out formatID)) { activeAnnouncement.AddFormatAttribute(formatID, formatAttributeMatch.Result("${attribute}")); } else { logger.Warn("Invalid media format attribute in SDP: " + sdpLine); } } else { activeAnnouncement.AddExtra(sdpLine); } } else { logger.Warn("There was no active media announcement for a media format attribute, ignoring."); } } else if(sdpLine.Trim().StartsWith(SDPMediaAnnouncement.MEDIA_FORMAT_PARAMETERS_ATTRIBUE_PREFIX)) { if(activeAnnouncement != null) { Match formatAttributeMatch = Regex.Match(sdpLine.Trim(), SDPMediaAnnouncement.MEDIA_FORMAT_PARAMETERS_ATTRIBUE_PREFIX + @"(?<id>\d+)\s+(?<attribute>.*)$"); if(formatAttributeMatch.Success) { int formatID; if(Int32.TryParse(formatAttributeMatch.Result("${id}"), out formatID)) { activeAnnouncement.AddFormatParameterAttribute(formatID, formatAttributeMatch.Result("${attribute}")); } else { logger.Warn("Invalid media format parameter attribute in SDP: " + sdpLine); } } else { activeAnnouncement.AddExtra(sdpLine); } } else { logger.Warn("There was no active media announcement for a media format parameter attribute, ignoring."); } } else if (sdpLine.Trim().StartsWith("a=" + ICE_CANDIDATE_ATTRIBUTE_PREFIX)) { if(sdp.IceCandidates == null) { sdp.IceCandidates = new List<IceCandidate>(); } sdp.IceCandidates.Add(IceCandidate.Parse(sdpLine.Substring(sdpLine.IndexOf(':') + 1))); } else { if(activeAnnouncement != null) activeAnnouncement.AddExtra(sdpLine); else sdp.AddExtra(sdpLine); } } return sdp; } else { return null; } } catch (Exception excp) { logger.Error("Exception ParseSDPDescription. " + excp.Message); throw excp; } }
public static SDP ParseSDPDescription(string sdpDescription) { try { if (sdpDescription != null && sdpDescription.Trim().Length > 0) { SDP sdp = new SDP(); sdp.m_rawSdp = sdpDescription; int mLineIndex = 0; SDPMediaAnnouncement activeAnnouncement = null; string[] sdpLines = Regex.Split(sdpDescription, CRLF); foreach (string sdpLine in sdpLines) { string sdpLineTrimmed = sdpLine.Trim(); switch (sdpLineTrimmed) { case var l when l.StartsWith("v="): if (!Decimal.TryParse(sdpLineTrimmed.Substring(2), out sdp.Version)) { logger.LogWarning("The Version value in an SDP description could not be parsed as a decimal: " + sdpLine + "."); } break; case var l when l.StartsWith("o="): string[] ownerFields = sdpLineTrimmed.Substring(2).Split(' '); sdp.Username = ownerFields[0]; sdp.SessionId = ownerFields[1]; Int32.TryParse(ownerFields[2], out sdp.AnnouncementVersion); sdp.NetworkType = ownerFields[3]; sdp.AddressType = ownerFields[4]; sdp.AddressOrHost = ownerFields[5]; break; case var l when l.StartsWith("s="): sdp.SessionName = sdpLineTrimmed.Substring(2); break; case var l when l.StartsWith("c="): if (activeAnnouncement != null) { activeAnnouncement.Connection = SDPConnectionInformation.ParseConnectionInformation(sdpLineTrimmed); } else if (sdp.Connection == null) { sdp.Connection = SDPConnectionInformation.ParseConnectionInformation(sdpLineTrimmed); } else { logger.LogWarning("The SDP message had a duplicate connection attribute which was ignored."); } break; case var l when l.StartsWith("b="): if (activeAnnouncement != null) { activeAnnouncement.BandwidthAttributes.Add(sdpLineTrimmed.Substring(2)); } else { sdp.BandwidthAttributes.Add(sdpLineTrimmed.Substring(2)); } break; case var l when l.StartsWith("t="): sdp.Timing = sdpLineTrimmed.Substring(2); break; case var l when l.StartsWith("m="): Match mediaMatch = Regex.Match(sdpLineTrimmed.Substring(2), @"(?<type>\w+)\s+(?<port>\d+)\s+(?<transport>\S+)(\s*)(?<formats>.*)$"); if (mediaMatch.Success) { SDPMediaAnnouncement announcement = new SDPMediaAnnouncement(); announcement.MLineIndex = mLineIndex; announcement.Media = SDPMediaTypes.GetSDPMediaType(mediaMatch.Result("${type}")); Int32.TryParse(mediaMatch.Result("${port}"), out announcement.Port); announcement.Transport = mediaMatch.Result("${transport}"); announcement.ParseMediaFormats(mediaMatch.Result("${formats}")); announcement.MediaStreamStatus = sdp.SessionMediaStreamStatus != null ? sdp.SessionMediaStreamStatus.Value : MediaStreamStatusEnum.SendRecv; sdp.Media.Add(announcement); activeAnnouncement = announcement; } else { logger.LogWarning("A media line in SDP was invalid: " + sdpLineTrimmed.Substring(2) + "."); } mLineIndex++; break; case var x when x.StartsWith($"a={GROUP_ATRIBUTE_PREFIX}"): sdp.Group = sdpLineTrimmed.Substring(sdpLineTrimmed.IndexOf(':') + 1); break; case var x when x.StartsWith($"a={ICE_UFRAG_ATTRIBUTE_PREFIX}"): if (activeAnnouncement != null) { activeAnnouncement.IceUfrag = sdpLineTrimmed.Substring(sdpLineTrimmed.IndexOf(':') + 1); } else { sdp.IceUfrag = sdpLineTrimmed.Substring(sdpLineTrimmed.IndexOf(':') + 1); } break; case var x when x.StartsWith($"a={ICE_PWD_ATTRIBUTE_PREFIX}"): if (activeAnnouncement != null) { activeAnnouncement.IcePwd = sdpLineTrimmed.Substring(sdpLineTrimmed.IndexOf(':') + 1); } else { sdp.IcePwd = sdpLineTrimmed.Substring(sdpLineTrimmed.IndexOf(':') + 1); } break; case var x when x.StartsWith($"a={DTLS_FINGERPRINT_ATTRIBUTE_PREFIX}"): if (activeAnnouncement != null) { activeAnnouncement.DtlsFingerprint = sdpLineTrimmed.Substring(sdpLineTrimmed.IndexOf(':') + 1); } else { sdp.DtlsFingerprint = sdpLineTrimmed.Substring(sdpLineTrimmed.IndexOf(':') + 1); } break; case var x when x.StartsWith($"a={ICE_CANDIDATE_ATTRIBUTE_PREFIX}"): if (activeAnnouncement != null) { if (activeAnnouncement.IceCandidates == null) { activeAnnouncement.IceCandidates = new List <string>(); } activeAnnouncement.IceCandidates.Add(sdpLineTrimmed.Substring(sdpLineTrimmed.IndexOf(':') + 1)); } else { if (sdp.IceCandidates == null) { sdp.IceCandidates = new List <string>(); } sdp.IceCandidates.Add(sdpLineTrimmed.Substring(sdpLineTrimmed.IndexOf(':') + 1)); } break; case var x when x == $"a={END_ICE_CANDIDATES_ATTRIBUTE}": // TODO: Set a flag. break; case var l when l.StartsWith(SDPMediaAnnouncement.MEDIA_FORMAT_ATTRIBUE_PREFIX): if (activeAnnouncement != null) { Match formatAttributeMatch = Regex.Match(sdpLineTrimmed, SDPMediaAnnouncement.MEDIA_FORMAT_ATTRIBUE_PREFIX + @"(?<id>\d+)\s+(?<attribute>.*)$"); if (formatAttributeMatch.Success) { string formatID = formatAttributeMatch.Result("${id}"); string rtpmap = formatAttributeMatch.Result("${attribute}"); if (activeAnnouncement.Media == SDPMediaTypesEnum.application) { var appMediaFormat = activeAnnouncement.ApplicationMediaFormats.Where(x => x.ID == formatID).FirstOrDefault(); if (appMediaFormat.ID != null) { appMediaFormat.Rtpmap = rtpmap; } } else { if (Int32.TryParse(formatID, out int id)) { if (activeAnnouncement.MediaFormats.ContainsKey(id)) { activeAnnouncement.MediaFormats[id] = activeAnnouncement.MediaFormats[id].WithUpdatedRtpmap(rtpmap, activeAnnouncement.MediaFormats[id]); } else { activeAnnouncement.MediaFormats.Add(id, new SDPAudioVideoMediaFormat(activeAnnouncement.Media, id, rtpmap, null)); } } else { logger.LogWarning("Invalid media format attribute in SDP: " + sdpLine); } } } else { activeAnnouncement.AddExtra(sdpLineTrimmed); } } else { logger.LogWarning("There was no active media announcement for a media format attribute, ignoring."); } break; case var l when l.StartsWith(SDPMediaAnnouncement.MEDIA_FORMAT_PARAMETERS_ATTRIBUE_PREFIX): if (activeAnnouncement != null) { Match formatAttributeMatch = Regex.Match(sdpLineTrimmed, SDPMediaAnnouncement.MEDIA_FORMAT_PARAMETERS_ATTRIBUE_PREFIX + @"(?<id>\d+)\s+(?<attribute>.*)$"); if (formatAttributeMatch.Success) { string formatID = formatAttributeMatch.Result("${id}"); string fmtp = formatAttributeMatch.Result("${attribute}"); if (activeAnnouncement.Media == SDPMediaTypesEnum.application) { var appMediaFormat = activeAnnouncement.ApplicationMediaFormats.Where(x => x.ID == formatID).FirstOrDefault(); if (appMediaFormat.ID != null) { appMediaFormat.Fmtmp = fmtp; } } else { if (Int32.TryParse(formatID, out int id)) { if (activeAnnouncement.MediaFormats.ContainsKey(id)) { activeAnnouncement.MediaFormats[id] = activeAnnouncement.MediaFormats[id].WithUpdatedFmtp(fmtp, activeAnnouncement.MediaFormats[id]); } else { activeAnnouncement.MediaFormats.Add(id, new SDPAudioVideoMediaFormat(activeAnnouncement.Media, id, null, fmtp)); } } else { logger.LogWarning("Invalid media format parameter attribute in SDP: " + sdpLine); } } } else { activeAnnouncement.AddExtra(sdpLineTrimmed); } } else { logger.LogWarning("There was no active media announcement for a media format parameter attribute, ignoring."); } break; case var l when l.StartsWith(SDPSecurityDescription.CRYPTO_ATTRIBUE_PREFIX): //2018-12-21 rj2: add a=crypto if (activeAnnouncement != null) { try { activeAnnouncement.AddCryptoLine(sdpLineTrimmed); } catch (FormatException fex) { logger.LogWarning("Error Parsing SDP-Line(a=crypto) " + fex); } } break; case var x when x.StartsWith($"a={MEDIA_ID_ATTRIBUTE_PREFIX}"): if (activeAnnouncement != null) { activeAnnouncement.MediaID = sdpLineTrimmed.Substring(sdpLineTrimmed.IndexOf(':') + 1); } else { logger.LogWarning("A media ID can only be set on a media announcement."); } break; case var l when l.StartsWith(SDPMediaAnnouncement.MEDIA_FORMAT_SSRC_GROUP_ATTRIBUE_PREFIX): if (activeAnnouncement != null) { string[] fields = sdpLineTrimmed.Substring(sdpLineTrimmed.IndexOf(':') + 1).Split(' '); // Set the ID. if (fields.Length > 0) { activeAnnouncement.SsrcGroupID = fields[0]; } // Add attributes for each of the SSRC values. for (int i = 1; i < fields.Length; i++) { if (uint.TryParse(fields[i], out var ssrc)) { activeAnnouncement.SsrcAttributes.Add(new SDPSsrcAttribute(ssrc, null, activeAnnouncement.SsrcGroupID)); } } } else { logger.LogWarning("A ssrc-group ID can only be set on a media announcement."); } break; case var l when l.StartsWith(SDPMediaAnnouncement.MEDIA_FORMAT_SSRC_ATTRIBUE_PREFIX): if (activeAnnouncement != null) { string[] ssrcFields = sdpLineTrimmed.Substring(sdpLineTrimmed.IndexOf(':') + 1).Split(' '); if (ssrcFields.Length > 0 && uint.TryParse(ssrcFields[0], out var ssrc)) { var ssrcAttribute = activeAnnouncement.SsrcAttributes.FirstOrDefault(x => x.SSRC == ssrc); if (ssrcAttribute == null) { ssrcAttribute = new SDPSsrcAttribute(ssrc, null, null); activeAnnouncement.SsrcAttributes.Add(ssrcAttribute); } if (ssrcFields.Length > 1) { if (ssrcFields[1].StartsWith(SDPSsrcAttribute.MEDIA_CNAME_ATTRIBUE_PREFIX)) { ssrcAttribute.Cname = ssrcFields[1].Substring(ssrcFields[1].IndexOf(':') + 1); } } } } else { logger.LogWarning("An ssrc attribute can only be set on a media announcement."); } break; case var x when MediaStreamStatusType.IsMediaStreamStatusAttribute(x, out var mediaStreamStatus): if (activeAnnouncement != null) { activeAnnouncement.MediaStreamStatus = mediaStreamStatus; } else { sdp.SessionMediaStreamStatus = mediaStreamStatus; } break; case var l when l.StartsWith(SDPMediaAnnouncement.MEDIA_FORMAT_SCTP_MAP_ATTRIBUE_PREFIX): if (activeAnnouncement != null) { activeAnnouncement.SctpMap = sdpLineTrimmed.Substring(sdpLineTrimmed.IndexOf(':') + 1); (var sctpPortStr, _, var maxMessageSizeStr) = activeAnnouncement.SctpMap.Split(' '); if (ushort.TryParse(sctpPortStr, out var sctpPort)) { activeAnnouncement.SctpPort = sctpPort; } else { logger.LogWarning($"An sctp-port value of {sctpPortStr} was not recognised as a valid port."); } if (!long.TryParse(maxMessageSizeStr, out activeAnnouncement.MaxMessageSize)) { logger.LogWarning($"A max-message-size value of {maxMessageSizeStr} was not recognised as a valid long."); } } else { logger.LogWarning("An sctpmap attribute can only be set on a media announcement."); } break; case var l when l.StartsWith(SDPMediaAnnouncement.MEDIA_FORMAT_SCTP_PORT_ATTRIBUE_PREFIX): if (activeAnnouncement != null) { string sctpPortStr = sdpLineTrimmed.Substring(sdpLineTrimmed.IndexOf(':') + 1); if (ushort.TryParse(sctpPortStr, out var sctpPort)) { activeAnnouncement.SctpPort = sctpPort; } else { logger.LogWarning($"An sctp-port value of {sctpPortStr} was not recognised as a valid port."); } } else { logger.LogWarning("An sctp-port attribute can only be set on a media announcement."); } break; case var l when l.StartsWith(SDPMediaAnnouncement.MEDIA_FORMAT_MAX_MESSAGE_SIZE_ATTRIBUE_PREFIX): if (activeAnnouncement != null) { string maxMessageSizeStr = sdpLineTrimmed.Substring(sdpLineTrimmed.IndexOf(':') + 1); if (!long.TryParse(maxMessageSizeStr, out activeAnnouncement.MaxMessageSize)) { logger.LogWarning($"A max-message-size value of {maxMessageSizeStr} was not recognised as a valid long."); } } else { logger.LogWarning("A max-message-size attribute can only be set on a media announcement."); } break; default: if (activeAnnouncement != null) { activeAnnouncement.AddExtra(sdpLineTrimmed); } else { sdp.AddExtra(sdpLineTrimmed); } break; } } return(sdp); } else { return(null); } } catch (Exception excp) { logger.LogError("Exception ParseSDPDescription. " + excp.Message); throw; } }
public static SDP ParseSDPDescription(string sdpDescription) { try { if (sdpDescription != null && sdpDescription.Trim().Length > 0) { SDP sdp = new SDP(); SDPMediaAnnouncement activeAnnouncement = null; string[] sdpLines = Regex.Split(sdpDescription, CRLF); foreach (string sdpLine in sdpLines) { if (sdpLine.Trim().StartsWith("v=")) { if (!Decimal.TryParse(sdpLine.Substring(2), out sdp.Version)) { logger.LogWarning("The Version value in an SDP description could not be parsed as a decimal: " + sdpLine + "."); } } else if (sdpLine.Trim().StartsWith("o=")) { string[] ownerFields = sdpLine.Substring(2).Split(' '); sdp.Username = ownerFields[0]; sdp.SessionId = ownerFields[1]; Int32.TryParse(ownerFields[2], out sdp.AnnouncementVersion); sdp.NetworkType = ownerFields[3]; sdp.AddressType = ownerFields[4]; sdp.Address = ownerFields[5]; } else if (sdpLine.Trim().StartsWith("s=")) { sdp.SessionName = sdpLine.Substring(2); } else if (sdpLine.Trim().StartsWith("c=")) { if (sdp.Connection == null) { sdp.Connection = SDPConnectionInformation.ParseConnectionInformation(sdpLine); } if (activeAnnouncement != null) { activeAnnouncement.Connection = SDPConnectionInformation.ParseConnectionInformation(sdpLine); } } else if (sdpLine.Trim().StartsWith("b=")) { if (activeAnnouncement != null) { activeAnnouncement.BandwidthAttributes.Add(sdpLine.Substring(2)); } else { sdp.BandwidthAttributes.Add(sdpLine.Substring(2)); } } else if (sdpLine.Trim().StartsWith("t=")) { sdp.Timing = sdpLine.Substring(2); } else if (sdpLine.Trim().StartsWith("m=")) { Match mediaMatch = Regex.Match(sdpLine.Substring(2).Trim(), @"(?<type>\w+)\s+(?<port>\d+)\s+(?<transport>\S+)(\s*)(?<formats>.*)$"); if (mediaMatch.Success) { SDPMediaAnnouncement announcement = new SDPMediaAnnouncement(); announcement.Media = SDPMediaTypes.GetSDPMediaType(mediaMatch.Result("${type}")); Int32.TryParse(mediaMatch.Result("${port}"), out announcement.Port); announcement.Transport = mediaMatch.Result("${transport}"); announcement.ParseMediaFormats(mediaMatch.Result("${formats}")); sdp.Media.Add(announcement); activeAnnouncement = announcement; } else { logger.LogWarning("A media line in SDP was invalid: " + sdpLine.Substring(2) + "."); } } else if (sdpLine.Trim().StartsWith("a=" + ICE_UFRAG_ATTRIBUTE_PREFIX)) { sdp.IceUfrag = sdpLine.Substring(sdpLine.IndexOf(':') + 1); } else if (sdpLine.Trim().StartsWith("a=" + ICE_PWD_ATTRIBUTE_PREFIX)) { sdp.IcePwd = sdpLine.Substring(sdpLine.IndexOf(':') + 1); } else if (sdpLine.Trim().StartsWith(SDPMediaAnnouncement.MEDIA_FORMAT_ATTRIBUE_PREFIX)) { if (activeAnnouncement != null) { Match formatAttributeMatch = Regex.Match(sdpLine.Trim(), SDPMediaAnnouncement.MEDIA_FORMAT_ATTRIBUE_PREFIX + @"(?<id>\d+)\s+(?<attribute>.*)$"); if (formatAttributeMatch.Success) { int formatID; if (Int32.TryParse(formatAttributeMatch.Result("${id}"), out formatID)) { activeAnnouncement.AddFormatAttribute(formatID, formatAttributeMatch.Result("${attribute}")); } else { logger.LogWarning("Invalid media format attribute in SDP: " + sdpLine); } } else { activeAnnouncement.AddExtra(sdpLine); } } else { logger.LogWarning("There was no active media announcement for a media format attribute, ignoring."); } } else if (sdpLine.Trim().StartsWith(SDPMediaAnnouncement.MEDIA_FORMAT_PARAMETERS_ATTRIBUE_PREFIX)) { if (activeAnnouncement != null) { Match formatAttributeMatch = Regex.Match(sdpLine.Trim(), SDPMediaAnnouncement.MEDIA_FORMAT_PARAMETERS_ATTRIBUE_PREFIX + @"(?<id>\d+)\s+(?<attribute>.*)$"); if (formatAttributeMatch.Success) { int formatID; if (Int32.TryParse(formatAttributeMatch.Result("${id}"), out formatID)) { activeAnnouncement.AddFormatParameterAttribute(formatID, formatAttributeMatch.Result("${attribute}")); } else { logger.LogWarning("Invalid media format parameter attribute in SDP: " + sdpLine); } } else { activeAnnouncement.AddExtra(sdpLine); } } else { logger.LogWarning("There was no active media announcement for a media format parameter attribute, ignoring."); } } else if (sdpLine.Trim().StartsWith("a=" + ICE_CANDIDATE_ATTRIBUTE_PREFIX)) { if (sdp.IceCandidates == null) { sdp.IceCandidates = new List <IceCandidate>(); } sdp.IceCandidates.Add(IceCandidate.Parse(sdpLine.Substring(sdpLine.IndexOf(':') + 1))); } else { if (activeAnnouncement != null) { activeAnnouncement.AddExtra(sdpLine); } else { sdp.AddExtra(sdpLine); } } } return(sdp); } else { return(null); } } catch (Exception excp) { logger.LogError("Exception ParseSDPDescription. " + excp.Message); throw excp; } }
/// <summary> /// Generates the base SDP for an offer or answer. The SDP will then be tailored depending /// on whether it's being used in an offer or an answer. /// </summary> private async Task <SDP> createBaseSdp() { DateTime startGatheringTime = DateTime.Now; IceConnectionState = IceConnectionStatesEnum.Gathering; await GetIceCandidatesAsync().ConfigureAwait(false); logger.LogDebug($"ICE gathering completed for in {DateTime.Now.Subtract(startGatheringTime).TotalMilliseconds:#}ms, candidate count {LocalIceCandidates.Count}."); IceConnectionState = IceConnectionStatesEnum.GatheringComplete; if (LocalIceCandidates.Count == 0) { //logger.LogWarning("No local socket candidates were found for WebRTC call closing."); //Close("No local ICE candidates available."); throw new ApplicationException("No local ICE candidates available."); } else { SDP offerSdp = new SDP(IPAddress.Loopback); offerSdp.SessionId = LocalSdpSessionID; bool haveIceCandidatesBeenAdded = false; string localIceCandidateString = null; foreach (var iceCandidate in LocalIceCandidates) { localIceCandidateString += iceCandidate.ToString(); } // Add a bundle attribute. Indicates that audio and video sessions will be multiplexed // on a single RTP socket. if (AudioLocalTrack != null && VideoLocalTrack != null) { offerSdp.Group = MEDIA_GROUPING; } // The media is being multiplexed so the audio and video RTP channel is the same. var rtpChannel = GetRtpChannel(SDPMediaTypesEnum.audio); // --- Audio announcement --- if (AudioLocalTrack != null) { SDPMediaAnnouncement audioAnnouncement = new SDPMediaAnnouncement( SDPMediaTypesEnum.audio, rtpChannel.RTPPort, AudioLocalTrack.Capabilties); audioAnnouncement.Transport = RTP_MEDIA_PROFILE; if (!haveIceCandidatesBeenAdded) { audioAnnouncement.IceCandidates = LocalIceCandidates; haveIceCandidatesBeenAdded = true; } audioAnnouncement.Connection = new SDPConnectionInformation(IPAddress.Any); audioAnnouncement.IceUfrag = LocalIceUser; audioAnnouncement.IcePwd = LocalIcePassword; audioAnnouncement.DtlsFingerprint = _dtlsCertificateFingerprint; audioAnnouncement.AddExtra(RTCP_MUX_ATTRIBUTE); audioAnnouncement.MediaStreamStatus = AudioLocalTrack.Transceiver.Direction; audioAnnouncement.MediaID = AudioLocalTrack.Transceiver.MID; offerSdp.Media.Add(audioAnnouncement); } // --- Video announcement --- if (VideoLocalTrack != null) { SDPMediaAnnouncement videoAnnouncement = new SDPMediaAnnouncement( SDPMediaTypesEnum.video, rtpChannel.RTPPort, VideoLocalTrack.Capabilties); videoAnnouncement.Transport = RTP_MEDIA_PROFILE; if (!haveIceCandidatesBeenAdded) { videoAnnouncement.IceCandidates = LocalIceCandidates; haveIceCandidatesBeenAdded = true; } videoAnnouncement.Connection = new SDPConnectionInformation(IPAddress.Any); videoAnnouncement.IceUfrag = LocalIceUser; videoAnnouncement.IcePwd = LocalIcePassword; videoAnnouncement.DtlsFingerprint = _dtlsCertificateFingerprint; videoAnnouncement.AddExtra(RTCP_MUX_ATTRIBUTE); videoAnnouncement.MediaStreamStatus = VideoLocalTrack.Transceiver.Direction; videoAnnouncement.MediaID = VideoLocalTrack.Transceiver.MID; offerSdp.Media.Add(videoAnnouncement); } return(offerSdp); } }
/// <summary> /// Generates the SDP for an offer or answer. /// </summary> private async Task <SDP> getSdp(string setupAttribute) { try { DateTime startGatheringTime = DateTime.Now; IceConnectionState = IceConnectionStatesEnum.Gathering; await GetIceCandidatesAsync(); logger.LogDebug($"ICE gathering completed for in {DateTime.Now.Subtract(startGatheringTime).TotalMilliseconds:#}ms, candidate count {LocalIceCandidates.Count}."); IceConnectionState = IceConnectionStatesEnum.GatheringComplete; if (LocalIceCandidates.Count == 0) { //logger.LogWarning("No local socket candidates were found for WebRTC call closing."); //Close("No local ICE candidates available."); throw new ApplicationException("No local ICE candidates available."); } else { bool haveIceCandidatesBeenAdded = false; string localIceCandidateString = null; foreach (var iceCandidate in LocalIceCandidates) { localIceCandidateString += iceCandidate.ToString(); } LocalIceUser = LocalIceUser ?? Crypto.GetRandomString(20); LocalIcePassword = LocalIcePassword ?? Crypto.GetRandomString(20) + Crypto.GetRandomString(20); SDP offerSdp = new SDP(IPAddress.Loopback); offerSdp.SessionId = Crypto.GetRandomInt(5).ToString(); // Add a bundle attribute. Indicates that audio and video sessions will be multiplexed // on a single RTP socket. if (RtpSession.AudioTrack != null && RtpSession.VideoTrack != null) { offerSdp.Group = MEDIA_GROUPING; } // --- Audio announcement --- if (RtpSession.AudioTrack != null) { SDPMediaAnnouncement audioAnnouncement = new SDPMediaAnnouncement( SDPMediaTypesEnum.audio, _rtpChannel.RTPPort, RtpSession.AudioTrack.Capabilties); audioAnnouncement.Transport = RTP_MEDIA_PROFILE; if (!haveIceCandidatesBeenAdded) { audioAnnouncement.IceCandidates = LocalIceCandidates; haveIceCandidatesBeenAdded = true; } audioAnnouncement.Connection = new SDPConnectionInformation(IPAddress.Any); audioAnnouncement.IceUfrag = LocalIceUser; audioAnnouncement.IcePwd = LocalIcePassword; audioAnnouncement.DtlsFingerprint = _dtlsCertificateFingerprint; audioAnnouncement.AddExtra(RTCP_MUX_ATTRIBUTE); audioAnnouncement.AddExtra(setupAttribute); audioAnnouncement.MediaStreamStatus = RtpSession.AudioTrack.Transceiver.Direction; audioAnnouncement.MediaID = RtpSession.AudioTrack.Transceiver.MID; offerSdp.Media.Add(audioAnnouncement); } // --- Video announcement --- if (RtpSession.VideoTrack != null) { SDPMediaAnnouncement videoAnnouncement = new SDPMediaAnnouncement( SDPMediaTypesEnum.video, _rtpChannel.RTPPort, RtpSession.VideoTrack.Capabilties); videoAnnouncement.Transport = RTP_MEDIA_PROFILE; if (!haveIceCandidatesBeenAdded) { videoAnnouncement.IceCandidates = LocalIceCandidates; haveIceCandidatesBeenAdded = true; } videoAnnouncement.Connection = new SDPConnectionInformation(IPAddress.Any); videoAnnouncement.IceUfrag = LocalIceUser; videoAnnouncement.IcePwd = LocalIcePassword; videoAnnouncement.DtlsFingerprint = _dtlsCertificateFingerprint; videoAnnouncement.AddExtra(RTCP_MUX_ATTRIBUTE); videoAnnouncement.AddExtra(setupAttribute); videoAnnouncement.MediaStreamStatus = RtpSession.VideoTrack.Transceiver.Direction; videoAnnouncement.MediaID = RtpSession.VideoTrack.Transceiver.MID;; offerSdp.Media.Add(videoAnnouncement); } OnSdpOfferReady?.Invoke(offerSdp); return(offerSdp); } // We may have received some remote candidates from the remote part SDP so perform an immediate STUN check. // If there are no remote candidates this call will end up being a NOP. //SendStunConnectivityChecks(null); //if (_doDtlsHandshake != null) //{ // _ = Task.Run(() => // { // int result = _doDtlsHandshake(this); // IsDtlsNegotiationComplete = (result == 0); // }); //} } catch (Exception excp) { logger.LogError("Exception getSdp. " + excp); Close(excp.Message); throw; } }
public static SDP ParseSDPDescription(string sdpDescription) { try { if (sdpDescription != null && sdpDescription.Trim().Length > 0) { SDP sdp = new SDP(); SDPMediaAnnouncement media = new SDPMediaAnnouncement(); string[] sdpLines = Regex.Split(sdpDescription, CRLF); //added WebRTC handling -> dont parse SDP especially sdp.isWebRTC = sdpDescription.Contains("a=source:webrtc"); if (sdp.isWebRTC) { foreach (string sdpLine in sdpLines) { sdp.ExtraAttributes.Add(sdpLine); } } else { foreach (string sdpLine in sdpLines) { if (sdpLine.Trim().StartsWith("v=")) { if (!Decimal.TryParse(sdpLine.Substring(2), out sdp.Version)) { logger.Warn("The Version value in an SDP description could not be parsed as a decimal: " + sdpLine + "."); } } else if (sdpLine.Trim().StartsWith("o=")) { string[] ownerFields = sdpLine.Substring(2).Split(' '); sdp.Username = ownerFields[0]; sdp.SessionId = ownerFields[1]; Int32.TryParse(ownerFields[2], out sdp.AnnouncementVersion); sdp.NetworkType = ownerFields[3]; sdp.AddressType = ownerFields[4]; sdp.Address = ownerFields[5]; } else if (sdpLine.Trim().StartsWith("s=")) { sdp.SessionName = sdpLine.Substring(2); } else if (sdpLine.Trim().StartsWith("c=")) { sdp.Connection = SDPConnectionInformation.ParseConnectionInformation(sdpLine); } else if (sdpLine.Trim().StartsWith("t=")) { sdp.Timing = sdpLine.Substring(2); } else if (sdpLine.Trim().StartsWith("m=")) { Match mediaMatch = Regex.Match(sdpLine.Substring(2).Trim(), @"(?<type>\w+)\s+(?<port>\d+)\s+(?<transport>\S+)\s+(?<formats>.*)$"); if (mediaMatch.Success) { media.Media = SDPMediaTypes.GetSDPMediaType(mediaMatch.Result("${type}")); Int32.TryParse(mediaMatch.Result("${port}"), out media.Port); media.Transport = mediaMatch.Result("${transport}"); media.ParseMediaFormats(mediaMatch.Result("${formats}")); } else { logger.Warn("A media line in SDP was invalid: " + sdpLine.Substring(2) + "."); } } else if (sdpLine.Trim().StartsWith("a=" + ICE_UFRAG_ATTRIBUTE_PREFIX)) { sdp.IceUfrag = sdpLine.Substring(sdpLine.IndexOf(':') + 1); } else if (sdpLine.Trim().StartsWith("a=" + ICE_PWD_ATTRIBUTE_PREFIX)) { sdp.IcePwd = sdpLine.Substring(sdpLine.IndexOf(':') + 1); } else if (sdpLine.Trim().StartsWith(SDPMediaAnnouncement.MEDIA_FORMAT_ATTRIBUE_PREFIX)) { Match formatAttributeMatch = Regex.Match(sdpLine.Trim(), SDPMediaAnnouncement.MEDIA_FORMAT_ATTRIBUE_PREFIX + @"(?<id>\d+)\s+(?<attribute>.*)$"); if (formatAttributeMatch.Success) { int formatID; if (Int32.TryParse(formatAttributeMatch.Result("${id}"), out formatID)) { media.AddFormatAttribute(formatID, formatAttributeMatch.Result("${attribute}")); } else { logger.Warn("Invalid media format attribute in SDP: " + sdpLine); } } else { sdp.ExtraAttributes.Add(sdpLine); } } else { sdp.ExtraAttributes.Add(sdpLine); } } sdp.Media.Add(media); } return sdp; } else { return null; } } catch (Exception excp) { logger.Error("Exception ParseSDPDescription. " + excp.Message); throw excp; } }
/// <summary> /// Initialises the WebRTC session by carrying out the ICE connectivity steps and when complete /// handing the RTP socket off for the DTLS handshake. Once the handshake is complete the session /// is ready for to exchange encrypted RTP and RTCP packets. /// </summary> /// <param name="turnServerEndPoint">An optional parameter that can be used include a TURN /// server in this session's ICE candidate gathering.</param> public async Task Initialise(DoDtlsHandshakeDelegate doDtlsHandshake, IPEndPoint turnServerEndPoint) { try { _doDtlsHandshake = doDtlsHandshake; _turnServerEndPoint = turnServerEndPoint; DateTime startGatheringTime = DateTime.Now; IceConnectionState = IceConnectionStatesEnum.Gathering; await GetIceCandidatesAsync(); logger.LogDebug($"ICE gathering completed for in {DateTime.Now.Subtract(startGatheringTime).TotalMilliseconds:#}ms, candidate count {LocalIceCandidates.Count}."); IceConnectionState = IceConnectionStatesEnum.GatheringComplete; if (LocalIceCandidates.Count == 0) { logger.LogWarning("No local socket candidates were found for WebRTC call closing."); Close("No local ICE candidates available."); } else { bool includeAudioOffer = _supportedAudioFormats?.Count() > 0; bool includeVideoOffer = _supportedVideoFormats?.Count() > 0; bool haveIceCandidatesBeenAdded = false; bool isMediaBundle = includeAudioOffer && includeVideoOffer; // Is this SDP offer bundling audio and video on the same RTP connection. string localIceCandidateString = null; foreach (var iceCandidate in LocalIceCandidates) { localIceCandidateString += iceCandidate.ToString(); } LocalIceUser = LocalIceUser ?? Crypto.GetRandomString(20); LocalIcePassword = LocalIcePassword ?? Crypto.GetRandomString(20) + Crypto.GetRandomString(20); SDP offerSdp = new SDP(IPAddress.Loopback); offerSdp.SessionId = Crypto.GetRandomInt(5).ToString(); // Add a bundle attribute. Indicates that audio and video sessions will be multiplexed // on a single RTP socket. if (isMediaBundle) { offerSdp.Group = MEDIA_GROUPING; } if (includeAudioOffer) { SDPMediaAnnouncement audioAnnouncement = new SDPMediaAnnouncement( SDPMediaTypesEnum.audio, _rtpChannel.RTPPort, _supportedAudioFormats); audioAnnouncement.Transport = RTP_MEDIA_PROFILE; if (!haveIceCandidatesBeenAdded) { audioAnnouncement.IceCandidates = LocalIceCandidates; haveIceCandidatesBeenAdded = true; } audioAnnouncement.Connection = new SDPConnectionInformation(IPAddress.Any); audioAnnouncement.IceUfrag = LocalIceUser; audioAnnouncement.IcePwd = LocalIcePassword; audioAnnouncement.DtlsFingerprint = _dtlsCertificateFingerprint; audioAnnouncement.AddExtra(RTCP_MUX_ATTRIBUTE); audioAnnouncement.AddExtra(SETUP_ATTRIBUTE); audioAnnouncement.MediaStreamStatus = AudioStreamStatus; if (isMediaBundle) { audioAnnouncement.MediaID = AUDIO_MEDIA_ID; } offerSdp.Media.Add(audioAnnouncement); } if (includeVideoOffer) { SDPMediaAnnouncement videoAnnouncement = new SDPMediaAnnouncement( SDPMediaTypesEnum.video, _rtpChannel.RTPPort, _supportedVideoFormats); videoAnnouncement.Transport = RTP_MEDIA_PROFILE; if (!haveIceCandidatesBeenAdded) { videoAnnouncement.IceCandidates = LocalIceCandidates; haveIceCandidatesBeenAdded = true; } videoAnnouncement.Connection = new SDPConnectionInformation(IPAddress.Any); videoAnnouncement.IceUfrag = LocalIceUser; videoAnnouncement.IcePwd = LocalIcePassword; videoAnnouncement.DtlsFingerprint = _dtlsCertificateFingerprint; videoAnnouncement.AddExtra(RTCP_MUX_ATTRIBUTE); videoAnnouncement.AddExtra(SETUP_ATTRIBUTE); videoAnnouncement.MediaStreamStatus = VideoStreamStatus; if (isMediaBundle) { videoAnnouncement.MediaID = VIDEO_MEDIA_ID; } offerSdp.Media.Add(videoAnnouncement); } SDP = offerSdp; OnSdpOfferReady?.Invoke(SDP); } // We may have received some remote candidates from the remote part SDP so perform an immediate STUN check. // If there are no remote candidates this call will end up being a NOP. SendStunConnectivityChecks(null); if (_doDtlsHandshake != null) { _ = Task.Run(() => { int result = _doDtlsHandshake(this); IsDtlsNegotiationComplete = (result == 0); }); } } catch (Exception excp) { logger.LogError("Exception WebRtcPeer.Initialise. " + excp); Close(excp.Message); } }