public override RtspResponse Describe(RtspRequest request)
{
var origin = SessionOriginator.CreateBuilder()
.Username("-")
.SessionId(1)
.SessionVersion(1)
.NetType(NetworkType.IN)
.AddrType(AddressType.IP4)
.UnicastAddress(request.RemoteEndpoint.Address.ToString())
.Build();
var connection = ConnectionInfo.CreateBuilder()
.NetType(NetworkType.IN)
.AddrType(AddressType.IP4)
.Address("0.0.0.0")
.Build();
var media = MediaDescription.CreateBuilder()
.MediaType(MediaType.APPLICATION)
.Port(0)
.Protocol(TransportProtocol.RTP_AVP)
.AddFormat(98)
.AddAttribute(new Attribute("control", request.URI.ToString()))
.AddAttribute(new Attribute("rtpmap", "98 application/vnd.pelco.test.metadata/90000"))
.Build();
var sdp = new SessionDescription()
{
SessionInformation = "Test session",
Origin = origin,
Connection = connection,
};
sdp.MediaDescriptions.Add(media);
return RtspResponse.CreateBuilder()
.Status(RtspResponse.Status.Ok)
.Body(sdp)
.Build();
}
public static SDP Parse(string data)
{
TimeDescription currentTd = null;
MediaDescription currentMd = null;
try
{
SDP sdp = new SDP();
var lines = Regex.Split(data, CRLF);
foreach (var line in lines)
{
var trimmed = line.Trim();
if (trimmed.StartsWith("v="))
{
var value = ParseKeyValueLine(trimmed, "Session Version");
decimal version;
if (!decimal.TryParse(value, out version))
{
// TODO(frank.lamar): warn.
}
else
{
sdp.Version = version;
}
}
else if (trimmed.StartsWith("o="))
{
sdp.Origin = SessionOriginator.Parse(trimmed);
}
else if (trimmed.StartsWith("s="))
{
sdp.SessionName = ParseKeyValueLine(trimmed, "Session Name");
}
else if (trimmed.StartsWith("i="))
{
var info = ParseKeyValueLine(trimmed, "Session Information");
if (currentMd != null)
{
// Media Title at the media level
currentMd.MediaTitle = info;
}
else
{
// Session information at the Session level.
sdp.SessionInformation = info;
}
}
else if (trimmed.StartsWith("u="))
{
var value = ParseKeyValueLine(trimmed, "Session URI");
Uri uri;
if (!Uri.TryCreate(value, UriKind.RelativeOrAbsolute, out uri))
{
throw new SdpParseException($"Unable to parse malformed Session URI {value}");
}
sdp.URI = uri;
}
else if (trimmed.StartsWith("e="))
{
sdp.Email = ParseKeyValueLine(trimmed, "Session Email");
}
else if (trimmed.StartsWith("p="))
{
sdp.PhoneNumber = ParseKeyValueLine(trimmed, "Session Phone Number");
}
else if (trimmed.StartsWith("c="))
{
var connection = ConnectionInfo.Parse(trimmed);
if (currentMd != null)
{
// Media Description connection
currentMd.Connection = connection;
}
else
{
// Session level connection
sdp.Connection = connection;
}
}
else if (trimmed.StartsWith("b="))
{
var bandwidth = BandwidthInfo.Parse(trimmed);
if (currentMd != null)
{
// Media Description bandwidth
currentMd.Bandwidths.Add(bandwidth);
}
else
{
// Session level bandwidth
sdp.Bandwidths.Add(bandwidth);
}
}
else if (trimmed.StartsWith("t="))
{
currentTd = TimeDescription.Parse(trimmed);
sdp.TimeDescriptions.Add(currentTd);
}
else if (trimmed.StartsWith("r="))
{
if (currentTd != null)
{
currentTd.RepeatTimes.Add(RepeatTime.Parse(trimmed));
}
// Just ignore the repeate time if no current time was defined.
}
else if (trimmed.StartsWith("z="))
{
sdp.TimeZone = TimeZone.Parse(trimmed);
}
else if (trimmed.StartsWith("a="))
{
if (currentMd != null)
{
// Media Description level attribute
currentMd.Attributes.Add(Attribute.Parse(trimmed));
}
else
{
// Session level attribute
sdp.Attributes.Add(Attribute.Parse(trimmed));
}
}
else if (trimmed.StartsWith("m="))
{
currentMd = MediaDescription.Parse(trimmed);
sdp.MediaDescriptions.Add(currentMd);
}
} // end foreach...
return(sdp);
}
catch (Exception e)
{
if (e is SdpParseException)
{
throw e;
}
throw new SdpParseException("Failed to parse session description", e);
}
}
