/// <summary>
/// Parses media from "m" SDP message field.
/// </summary>
/// <param name="mValue">"m" SDP message field.</param>
/// <returns></returns>
public static SDP_MediaDescription Parse(string mValue)
{
SDP_MediaDescription media = new SDP_MediaDescription();
// m=<media> <port>/<number of ports> <proto> <fmt> ...
StringReader r = new StringReader(mValue);
r.QuotedReadToDelimiter('=');
//--- <media> ------------------------------------------------------------
string word = r.ReadWord();
if (word == null)
{
throw new Exception("SDP message \"m\" field <media> value is missing !");
}
media.m_MediaType = word;
//--- <port>/<number of ports> -------------------------------------------
word = r.ReadWord();
if (word == null)
{
throw new Exception("SDP message \"m\" field <port> value is missing !");
}
if (word.IndexOf('/') > -1)
{
string[] port_nPorts = word.Split('/');
media.m_Port = Convert.ToInt32(port_nPorts[0]);
media.m_NumberOfPorts = Convert.ToInt32(port_nPorts[1]);
}
else
{
media.m_Port = Convert.ToInt32(word);
media.m_NumberOfPorts = 1;
}
//--- <proto> --------------------------------------------------------------
word = r.ReadWord();
if (word == null)
{
throw new Exception("SDP message \"m\" field <proto> value is missing !");
}
media.m_Protocol = word;
//--- <fmt> ----------------------------------------------------------------
word = r.ReadWord();
if (word == null)
{
media.m_MediaFormat = "";
}
else
{
media.m_MediaFormat = word;
}
return media;
}
/// <summary>
/// Parses SDP from raw data.
/// </summary>
/// <param name="data">Raw SDP data.</param>
/// <exception cref="ArgumentNullException">Is raised when <b>data</b> is null reference.</exception>
public static SDP_Message Parse(string data)
{
if (data == null)
{
throw new ArgumentNullException("data");
}
SDP_Message sdp = new SDP_Message();
StringReader r = new StringReader(data);
string line = r.ReadLine();
//--- Read global fields ---------------------------------------------
while (line != null)
{
line = line.Trim();
// We reached to media descriptions
if (line.ToLower().StartsWith("m"))
{
/*
* m= (media name and transport address)
* i=* (media title)
* c=* (connection information -- optional if included at session level)
* b=* (zero or more bandwidth information lines)
* k=* (encryption key)
* a=* (zero or more media attribute lines)
*/
SDP_Media media = new SDP_Media();
media.MediaDescription = SDP_MediaDescription.Parse(line);
sdp.Media.Add(media);
line = r.ReadLine();
// Pasrse media fields and attributes
while (line != null)
{
line = line.Trim();
// Next media descrition, just stop active media description parsing,
// fall through main while, allow next while loop to process it.
if (line.ToLower().StartsWith("m"))
{
break;
}
// i media title
else if (line.ToLower().StartsWith("i"))
{
media.Title = line.Split(new[] { '=' }, 2)[1].Trim();
}
// c connection information
else if (line.ToLower().StartsWith("c"))
{
media.ConnectionData = SDP_ConnectionData.Parse(line);
}
// a Attributes
else if (line.ToLower().StartsWith("a"))
{
media.Attributes.Add(SDP_Attribute.Parse(line));
}
line = r.ReadLine();
}
break;
}
// v Protocol Version
else if (line.ToLower().StartsWith("v"))
{
sdp.Version = line.Split(new[] { '=' }, 2)[1].Trim();
}
// o Origin
else if (line.ToLower().StartsWith("o"))
{
sdp.Originator = line.Split(new[] { '=' }, 2)[1].Trim();
}
// s Session Name
else if (line.ToLower().StartsWith("s"))
{
sdp.SessionName = line.Split(new[] { '=' }, 2)[1].Trim();
}
// i Session Information
else if (line.ToLower().StartsWith("i"))
{
sdp.SessionDescription = line.Split(new[] { '=' }, 2)[1].Trim();
}
// u URI
else if (line.ToLower().StartsWith("u"))
{
sdp.Uri = line.Split(new[] { '=' }, 2)[1].Trim();
}
// c Connection Data
else if (line.ToLower().StartsWith("c"))
{
sdp.ConnectionData = SDP_ConnectionData.Parse(line);
}
// t Timing
else if (line.ToLower().StartsWith("t"))
{
sdp.Times.Add(SDP_Time.Parse(line));
}
// a Attributes
else if (line.ToLower().StartsWith("a"))
{
sdp.Attributes.Add(SDP_Attribute.Parse(line));
}
line = r.ReadLine().Trim();
}
return(sdp);
}
