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;
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();
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.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;
}
}
