/// <summary>
/// Selects the transport based on the configuration of the system..
/// </summary>
/// <param name="requestSetup">The request setup message.</param>
/// <returns>The selected transport</returns>
/// <remarks>
/// The transport is selected by taking the first supported transport
/// in order of appearence.
/// </remarks>
private static RtspTransport SelectTransport(RtspRequestSetup requestSetup)
{
RtspTransport selectedTransport = null;
const bool acceptTCP = false;
const bool acceptUDPUnicast = true;
const bool acceptUDPMulticast = true;
foreach (RtspTransport proposedTransport in requestSetup.GetTransports())
{
if (acceptTCP && proposedTransport.LowerTransport == RtspTransport.LowerTransportType.TCP)
{
selectedTransport = proposedTransport;
break;
}
if (acceptUDPMulticast && proposedTransport.LowerTransport == RtspTransport.LowerTransportType.UDP &&
proposedTransport.IsMulticast)
{
selectedTransport = proposedTransport;
break;
}
if (acceptUDPUnicast && proposedTransport.LowerTransport == RtspTransport.LowerTransportType.UDP &&
!proposedTransport.IsMulticast)
{
selectedTransport = proposedTransport;
break;
}
}
return(selectedTransport);
}
internal RtspResponse HandleSetup(RtspRequestSetup request)
{
Contract.Requires(request != null);
Contract.Ensures(Contract.Result <RtspResponse>() != null);
var response = request.CreateResponse();
if (string.IsNullOrEmpty(response.Session))
{
// TODO Allocate a real session ID
response.Session = sessionGenerator.Next().ToString();
}
RtspPushDescription description;
if (!PushDescriptions.TryGetValue(request.RtspUri.AbsolutePath, out description))
{
response.ReturnCode = 404;
return(response);
}
bool configok = false;
foreach (var transport in request.GetTransports())
{
if (transport.LowerTransport == RtspTransport.LowerTransportType.UDP &&
!transport.IsMulticast
)
{
var forwarder = new UDPForwarder();
description.AddForwarders(response.Session, request.RtspUri.AbsolutePath, forwarder);
transport.ServerPort = new PortCouple(forwarder.ListenVideoPort);
response.Headers[RtspHeaderNames.Transport] = transport.ToString();
configok = true;
}
}
if (!configok)
{
response.ReturnCode = 461;
}
return(response);
}