CSharpRTMP.Core.Protocols.Rtsp.BaseRtspAppProtocolHandler.HandleRTSPRequestSetupOutbound C# (CSharp) Method

        private bool HandleRTSPRequestSetupOutbound(RtspProtocol @from, Variant requestHeaders, string requestContent)
        {
            //1. Minimal sanitize
            if (requestHeaders[RTSP_HEADERS, RTSP_HEADERS_TRANSPORT] == null)
            {
                FATAL("RTSP %s request doesn't have %s header line",
                        RTSP_METHOD_SETUP,
                        RTSP_HEADERS_TRANSPORT);
                return false;
            }

            //2. get the transport header line
            string raw = requestHeaders[RTSP_HEADERS, RTSP_HEADERS_TRANSPORT];
            Variant transport = Variant.Get();
            if (!Rtsp.SDP.ParseTransportLine(raw, transport))
            {
                FATAL("Unable to parse transport line {0}", (raw));
                return false;
            }
            bool forceTcp = false;
            if (transport["client_port"]!=null && (transport["rtp/avp/udp"]!=null || transport["rtp/avp"]!=null))
            {
                forceTcp = false;
            }
            else if (transport["interleaved"]!=null && transport["rtp/avp/tcp"]!=null)
            {
                forceTcp = true;
            }
            else
            {
                FATAL("Invalid transport line: {0}", (transport.ToString()));
                return false;
            }
            from.CustomParameters["forceTcp"] = forceTcp;
            
            //3. Get the outbound connectivity
            OutboundConnectivity pOutboundConnectivity = GetOutboundConnectivity(from, forceTcp);
            if (pOutboundConnectivity == null)
            {
                FATAL("Unable to get the outbound connectivity");
                return false;
            }

            //5. Find out if this is audio or video
            bool isAudioTrack;
            string rawUrl = requestHeaders[RTSP_FIRST_LINE,RTSP_URL];
            string audioTrackId = "trackID=" + from.CustomParameters["audioTrackId"];
            string videoTrackId = "trackID=" + from.CustomParameters["videoTrackId"];
            /*FINEST("rawUrl: %s; audioTrackId: %s; videoTrackId: %s; fa: %d; fv: %d",
                (rawUrl),
                (audioTrackId),
                (videoTrackId),
                rawUrl.find(audioTrackId) != string::npos,
                rawUrl.find(videoTrackId) != string::npos
            );*/
            if (rawUrl.Contains(audioTrackId))
            {
                isAudioTrack = true;
            }
            else if (rawUrl.Contains(videoTrackId))
            {
                isAudioTrack = false;
            }
            else
            {
                FATAL("Invalid track. Wanted: {0} or {1}; Got: {2}",
                        (from.CustomParameters["audioTrackId"]),
                        (from.CustomParameters["videoTrackId"]),
                        (requestHeaders[RTSP_FIRST_LINE,RTSP_URL]));
                return false;
            }
            from.CustomParameters["isAudioTrack"] = isAudioTrack;
            
            if (isAudioTrack)
            {
                if (forceTcp)
                {
                    from.CustomParameters["audioDataChannelNumber"] = transport["interleaved","data"];
                    from.CustomParameters["audioRtcpChannelNumber"] = transport["interleaved","rtcp"];
                    from.CustomParameters["audioTrackUri"] = requestHeaders[RTSP_FIRST_LINE,RTSP_URL];
                    pOutboundConnectivity.HasAudio = true;
                }
                else
                {
                    from.CustomParameters["audioDataPortNumber"] = transport["client_port","data"];
                    from.CustomParameters["audioRtcpPortNumber"] = transport["client_port","rtcp"];
                    from.CustomParameters["audioTrackUri"] = requestHeaders[RTSP_FIRST_LINE,RTSP_URL];
                    pOutboundConnectivity.HasAudio = true;
                }
            }
            else
            {
                if (forceTcp)
                {
                    from.CustomParameters["videoDataChannelNumber"] = transport["interleaved","data"];
                    from.CustomParameters["videoRtcpChannelNumber"] = transport["interleaved","rtcp"];
                    from.CustomParameters["videoTrackUri"] = requestHeaders[RTSP_FIRST_LINE,RTSP_URL];
                    pOutboundConnectivity.HasVideo = true;
                }
                else
                {
                    from.CustomParameters["videoDataPortNumber"] = transport["client_port","data"];
                    from.CustomParameters["videoRtcpPortNumber"] = transport["client_port","rtcp"];
                    from.CustomParameters["videoTrackUri"] = requestHeaders[RTSP_FIRST_LINE,RTSP_URL];
                    pOutboundConnectivity.HasVideo = true;
                }
            }
            
            //10. Create a session
            from.GenerateSessionId();

            //11 Compose the response
            from.PushResponseFirstLine(RTSP_VERSION_1_0, 200, "OK");
            @from.PushResponseHeader(RTSP_HEADERS_TRANSPORT,
                forceTcp
                    ? "RTP/AVP/TCP;unicast;interleaved="+ transport["interleaved","all"]
                    : $"RTP/AVP/UDP;unicast;source={((TCPCarrier) @from.IOHandler).NearIP};client_port={(string)(transport["client_port","all"])};server_port={(isAudioTrack ? (pOutboundConnectivity.AudioPorts) : (pOutboundConnectivity.VideoPorts))};ssrc={(isAudioTrack ? pOutboundConnectivity.AudioSSRC : pOutboundConnectivity.VideoSSRC)}");
            //12. Done
            return from.SendResponseMessage();
        }