/// <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);
}
}
