private RtpSession Setup(MediaTrack track, RtpChannelSink sink, bool interleaved)
{
lock (SourceLock)
{
IRtpSource rtpSource = null;
try
{
TransportHeader transport = null;
if (interleaved)
{
transport = TransportHeader.CreateBuilder()
.Type(Media.RTSP.TransportType.RtspInterleaved)
.InterleavedChannels(0, 1)
.Build();
}
else
{
// TODO(frank.lamar): Add multicast support.
rtpSource = new RtpUdpSource(track.Address);
transport = TransportHeader.CreateBuilder()
.Type(Media.RTSP.TransportType.UdpUnicast)
.ClientPorts(rtpSource.RtpPort, rtpSource.RtcpPort)
.Build();
}
var response = CheckResponse(_client.Send(RtspRequest.CreateBuilder()
.Method(RtspRequest.RtspMethod.SETUP)
.Uri(track.ControlUri)
.AddHeader(RtspHeaders.Names.TRANSPORT, transport.ToString())
.Build()), RtspRequest.RtspMethod.SETUP);
if (!response.Headers.ContainsKey(RtspHeaders.Names.SESSION))
{
throw new RtspClientException("Rtsp SETUP response does not contain a session id");
}
var rtspSession = Session.Parse(response.Headers[RtspHeaders.Names.SESSION]);
transport = response.Transport;
if (interleaved)
{
if (transport.Type != Media.RTSP.TransportType.RtspInterleaved)
{
throw new RtspClientException($"Server does not support interleaved. Response Transport='{transport}'");
}
var channels = transport.InterleavedChannels != null ? transport.InterleavedChannels : new PortPair(0, 1);
sink.Channel = channels.RtpPort; // Ensure that the sink contains the correct Interleaved channel id.
rtpSource = new RtpInterleavedSource(_client.GetChannelSource(channels.RtpPort),
_client.GetChannelSource(channels.RtcpPort));
}
var pipeline = MediaPipeline.CreateBuilder()
.Source(rtpSource.RtpSource)
.TransformIf(transport.SSRC != null, new SsrcFilter(transport.SSRC))
.Sink(sink)
.Build();
var session = new RtpSession(track, rtspSession, rtpSource);
session.Pipelines.Add(pipeline);
session.Start();
CheckAndStartRefreshTimer(session.Session.Timeout);
return(session);
}
catch (Exception e)
{
if (rtpSource != null)
{
rtpSource?.Stop();
}
if (e is RtspClientException)
{
throw e;
}
throw new RtspClientException($"Unable to set up media track {track.ID}", e);
}
}
}
