private async Task SetupTrackAsync(RtspMediaTrackInfo track, CancellationToken token)
{
RtspRequestMessage setupRequest;
RtspResponseMessage setupResponse;
int rtpChannelNumber;
int rtcpChannelNumber;
Socket rtpClient = null;
Socket rtcpClient = null;
if (_connectionParameters.RtpTransport == RtpTransportProtocol.UDP)
{
rtpClient = NetworkClientFactory.CreateUdpClient();
rtcpClient = NetworkClientFactory.CreateUdpClient();
try
{
IPEndPoint endPoint = new IPEndPoint(IPAddress.Any, 0);
rtpClient.Bind(endPoint);
int rtpPort = ((IPEndPoint)rtpClient.LocalEndPoint).Port;
endPoint = new IPEndPoint(IPAddress.Any, rtpPort + 1);
try
{
rtcpClient.Bind(endPoint);
}
catch (SocketException e) when(e.SocketErrorCode == SocketError.AddressAlreadyInUse)
{
endPoint = new IPEndPoint(IPAddress.Any, 0);
rtcpClient.Bind(endPoint);
}
int rtcpPort = ((IPEndPoint)rtcpClient.LocalEndPoint).Port;
setupRequest = _requestMessageFactory.CreateSetupUdpUnicastRequest(track.TrackName,
rtpPort, rtcpPort);
setupResponse = await _rtspTransportClient.EnsureExecuteRequest(setupRequest, token);
}
catch
{
rtpClient.Close();
rtcpClient.Close();
throw;
}
}
else
{
int channelCounter = _streamsMap.Count;
rtpChannelNumber = channelCounter;
rtcpChannelNumber = ++channelCounter;
setupRequest = _requestMessageFactory.CreateSetupTcpInterleavedRequest(track.TrackName,
rtpChannelNumber, rtcpChannelNumber);
setupResponse = await _rtspTransportClient.EnsureExecuteRequest(setupRequest, token);
}
string transportHeader = setupResponse.Headers[WellKnownHeaders.Transport];
if (string.IsNullOrEmpty(transportHeader))
{
throw new RtspBadResponseException("Transport header is not found");
}
string portsAttributeName = _connectionParameters.RtpTransport == RtpTransportProtocol.UDP
? "server_port"
: "interleaved";
string[] transportAttributes = transportHeader.Split(TransportAttributesSeparator, StringSplitOptions.RemoveEmptyEntries);
string portsAttribute = transportAttributes.FirstOrDefault(a => a.StartsWith(portsAttributeName, StringComparison.InvariantCultureIgnoreCase));
if (portsAttribute == null || !TryParseSeverPorts(portsAttribute, out rtpChannelNumber, out rtcpChannelNumber))
{
throw new RtspBadResponseException("Server ports are not found");
}
if (_connectionParameters.RtpTransport == RtpTransportProtocol.UDP)
{
string sourceAttribute = transportAttributes.FirstOrDefault(a => a.StartsWith("source", StringComparison.InvariantCultureIgnoreCase));
int equalSignIndex;
IPAddress sourceAddress;
if (sourceAttribute != null && (equalSignIndex = sourceAttribute.IndexOf("=", StringComparison.CurrentCultureIgnoreCase)) != -1)
{
sourceAddress = IPAddress.Parse(sourceAttribute.Substring(++equalSignIndex).Trim());
}
else
{
sourceAddress = ((IPEndPoint)_rtspTransportClient.RemoteEndPoint).Address;
}
Debug.Assert(rtpClient != null, nameof(rtpClient) + " != null");
rtpClient.Connect(new IPEndPoint(sourceAddress, rtpChannelNumber));
Debug.Assert(rtcpClient != null, nameof(rtcpClient) + " != null");
rtcpClient.Connect(new IPEndPoint(sourceAddress, rtcpChannelNumber));
var udpHolePunchingPacketSegment = new ArraySegment <byte>(Array.Empty <byte>());
await rtpClient.SendAsync(udpHolePunchingPacketSegment, SocketFlags.None);
await rtcpClient.SendAsync(udpHolePunchingPacketSegment, SocketFlags.None);
_udpClientsMap[rtpChannelNumber] = rtpClient;
_udpClientsMap[rtcpChannelNumber] = rtcpClient;
}
ParseSessionHeader(setupResponse.Headers[WellKnownHeaders.Session]);
IMediaPayloadParser mediaPayloadParser = MediaPayloadParser.CreateFrom(track.Codec);
IRtpSequenceAssembler rtpSequenceAssembler;
if (_connectionParameters.RtpTransport == RtpTransportProtocol.TCP)
{
rtpSequenceAssembler = null;
mediaPayloadParser.FrameGenerated = OnFrameGeneratedLockfree;
}
else
{
rtpSequenceAssembler = new RtpSequenceAssembler(Constants.UdpReceiveBufferSize, 256);
mediaPayloadParser.FrameGenerated = OnFrameGeneratedThreadSafe;
}
var rtpStream = new RtpStream(mediaPayloadParser, track.SamplesFrequency, rtpSequenceAssembler);
_streamsMap.Add(rtpChannelNumber, rtpStream);
var rtcpStream = new RtcpStream();
rtcpStream.SessionShutdown += (sender, args) => _serverCancellationTokenSource.Cancel();
_streamsMap.Add(rtcpChannelNumber, rtcpStream);
uint senderSyncSourceId = (uint)_random.Next();
var rtcpReportsProvider = new RtcpReceiverReportsProvider(rtpStream, rtcpStream, senderSyncSourceId);
_reportProvidersMap.Add(rtpChannelNumber, rtcpReportsProvider);
}
private async Task SetupTrackAsync(RtspMediaTrackInfo track, CancellationToken token)
{
RtspRequestMessage setupRequest;
RtspResponseMessage setupResponse;
int rtpChannelNumber;
int rtcpChannelNumber;
Socket rtpClient = null;
Socket rtcpClient = null;
if (_connectionParameters.RtpTransport == RtpTransportProtocol.UDP)
{
rtpClient = NetworkClientFactory.CreateUdpClient();
rtcpClient = NetworkClientFactory.CreateUdpClient();
try
{
IPEndPoint endPoint = new IPEndPoint(IPAddress.Any, 0);
rtpClient.Bind(endPoint);
int rtpPort = ((IPEndPoint)rtpClient.LocalEndPoint).Port;
endPoint = new IPEndPoint(IPAddress.Any, rtpPort + 1);
try
{
rtcpClient.Bind(endPoint);
}
catch (SocketException e) when(e.SocketErrorCode == SocketError.AddressAlreadyInUse)
{
endPoint = new IPEndPoint(IPAddress.Any, 0);
rtcpClient.Bind(endPoint);
}
int rtcpPort = ((IPEndPoint)rtcpClient.LocalEndPoint).Port;
setupRequest = _requestMessageFactory.CreateSetupUdpUnicastRequest(track.TrackName,
rtpPort, rtcpPort);
setupResponse = await _rtspTransportClient.EnsureExecuteRequest(setupRequest, token);
}
catch
{
rtpClient.Close();
rtcpClient.Close();
throw;
}
}
else
{
int channelCounter = _streamsMap.Count;
rtpChannelNumber = channelCounter;
rtcpChannelNumber = ++channelCounter;
setupRequest = _requestMessageFactory.CreateSetupTcpInterleavedRequest(track.TrackName,
rtpChannelNumber, rtcpChannelNumber);
setupResponse = await _rtspTransportClient.EnsureExecuteRequest(setupRequest, token);
}
string transportHeader = setupResponse.Headers[WellKnownHeaders.Transport];
if (string.IsNullOrEmpty(transportHeader))
{
throw new RtspBadResponseException("Transport header is not found");
}
string attributeName = _connectionParameters.RtpTransport == RtpTransportProtocol.UDP
? "server_port"
: "interleaved";
if (!ParseSeverPorts(transportHeader, attributeName, out rtpChannelNumber, out rtcpChannelNumber))
{
throw new RtspBadResponseException("Server ports are not found");
}
if (_connectionParameters.RtpTransport == RtpTransportProtocol.UDP)
{
IPEndPoint remoteEndPoint = (IPEndPoint)_rtspTransportClient.RemoteEndPoint;
rtpClient?.Connect(new IPEndPoint(remoteEndPoint.Address, rtpChannelNumber));
rtcpClient?.Connect(new IPEndPoint(remoteEndPoint.Address, rtcpChannelNumber));
var udpHolePunchingPacketSegment = new ArraySegment <byte>(Array.Empty <byte>());
await rtpClient.SendAsync(udpHolePunchingPacketSegment, SocketFlags.None);
await rtcpClient.SendAsync(udpHolePunchingPacketSegment, SocketFlags.None);
_udpClientsMap[rtpChannelNumber] = rtpClient;
_udpClientsMap[rtcpChannelNumber] = rtcpClient;
}
ParseSessionHeader(setupResponse.Headers[WellKnownHeaders.Session]);
IMediaPayloadParser mediaPayloadParser = MediaPayloadParser.CreateFrom(track.Codec);
IRtpSequenceAssembler rtpSequenceAssembler;
if (_connectionParameters.RtpTransport == RtpTransportProtocol.TCP)
{
rtpSequenceAssembler = null;
mediaPayloadParser.FrameGenerated = OnFrameGeneratedLockfree;
}
else
{
rtpSequenceAssembler = new RtpSequenceAssembler(Constants.UdpReceiveBufferSize, 8);
mediaPayloadParser.FrameGenerated = OnFrameGeneratedThreadSafe;
}
var rtpStream = new RtpStream(mediaPayloadParser, track.SamplesFrequency, rtpSequenceAssembler);
_streamsMap.Add(rtpChannelNumber, rtpStream);
var rtcpStream = new RtcpStream();
rtcpStream.SessionShutdown += (sender, args) => _serverCancellationTokenSource.Cancel();
_streamsMap.Add(rtcpChannelNumber, rtcpStream);
uint senderSyncSourceId = (uint)_random.Next();
var rtcpReportsProvider = new RtcpReceiverReportsProvider(rtpStream, rtcpStream, senderSyncSourceId);
_reportProvidersMap.Add(rtpChannelNumber, rtcpReportsProvider);
}