public SdpSessionDescription Parse(string sdp)
{
var sessionDescription = new SdpSessionDescription();
using var sr = new StringReader(sdp);
ParseSessionDescription(sessionDescription, sr);
return(sessionDescription);
}
private void ParseSessionAttribute(SdpSessionDescription sessionDescription, string attribute)
{
ParseAttributeKeyValue(attribute, out var key, out var value);
switch (key)
{
case "bundle" when value != null:
sessionDescription.Bundles = value.Split(' ').ToList();
break;
case "msid-semantic" when value != null:
sessionDescription.WebRtcMediaStreamId = value.Substring(value.IndexOf(" WMS ", StringComparison.Ordinal) + 1);
break;
}
}
private void ParseSessionDescription(SdpSessionDescription sessionDescription, StringReader stringReader)
{
var line = stringReader.ReadLine();
if (line is null)
{
return;
}
ParseSdpLine(line, out var key, out var value);
switch (key)
{
case "v":
sessionDescription.Version = byte.Parse(value);
break;
case "o":
sessionDescription.Origin = ParseOriginLine(value);
break;
case "s":
sessionDescription.SessionName = value;
break;
case "t":
var timeParts = value.Split(' ');
sessionDescription.StartTime = long.Parse(timeParts[0]);
sessionDescription.EndTime = long.Parse(timeParts[1]);
break;
case "m":
ParseMediaDescription(sessionDescription, value, stringReader);
break;
case "a":
ParseSessionAttribute(sessionDescription, value);
break;
}
ParseSessionDescription(sessionDescription, stringReader);
}
private void ParseMediaDescription(SdpSessionDescription sessionDescription, string medialine, TextReader stringReader)
{
var mediaDescription = new SdpMediaDescription();
var parts = medialine.Split(' ');
mediaDescription.Media = TryGet(parts, 0);
mediaDescription.Port = int.Parse(TryGet(parts, 1));
mediaDescription.Protocol = TryGet(parts, 2);
mediaDescription.MediaFormatDescriptions = parts.Skip(3)
.Select(int.Parse)
.ToDictionary(pt => pt, pt => new SdpMediaFormatDescription
{
PayloadType = pt
});
var line = stringReader.ReadLine();
while (line != null)
{
ParseSdpLine(line, out var key, out var value);
switch (key)
{
case "c":
mediaDescription.Connection = ParseConnectionLine(value);
break;
case "a":
ParseMediaDescriptionAttribute(mediaDescription, value);
break;
case "m":
ParseMediaDescription(sessionDescription, value, stringReader);
break;
}
line = stringReader.ReadLine();
}
sessionDescription.MediaDescriptions.Add(mediaDescription);
}