SIPSorcery.Net.RTPChannel.SendH264Frame C# (CSharp) Method

        public void SendH264Frame(byte[] frame, uint frameSpacing, int payloadType)
        {
            try
            {
                if (_isClosed)
                {
                    logger.Warn("SendH264Frame cannot be called on a closed session.");
                }
                else if (_rtpSocketError != SocketError.Success)
                {
                    logger.Warn("SendH264Frame was called for an RTP socket in an error state of " + _rtpSocketError + ".");
                }
                else
                {
                    _timestamp = (_timestamp == 0) ? DateTimeToNptTimestamp32(DateTime.Now) : (_timestamp + frameSpacing) % UInt32.MaxValue;

                    //System.Diagnostics.Debug.WriteLine("Sending " + frame.Length + " H264 encoded bytes to client, timestamp " + _timestamp + ", starting sequence number " + _sequenceNumber + ".");

                    for (int index = 0; index * RTP_MAX_PAYLOAD < frame.Length; index++)
                    {
                        uint offset = Convert.ToUInt32(index * RTP_MAX_PAYLOAD);
                        int payloadLength = ((index + 1) * RTP_MAX_PAYLOAD < frame.Length) ? RTP_MAX_PAYLOAD : frame.Length - index * RTP_MAX_PAYLOAD;

                        RTPPacket rtpPacket = new RTPPacket(payloadLength + H264_RTP_HEADER_LENGTH);
                        rtpPacket.Header.SyncSource = _syncSource;
                        rtpPacket.Header.SequenceNumber = _sequenceNumber++;
                        rtpPacket.Header.Timestamp = _timestamp;
                        rtpPacket.Header.MarkerBit = 0;
                        rtpPacket.Header.PayloadType = payloadType;

                        // Start RTP packet in frame 0x1c 0x89
                        // Middle RTP packet in frame 0x1c 0x09
                        // Last RTP packet in frame 0x1c 0x49

                        byte[] h264Header = new byte[] { 0x1c, 0x09 };

                        if (index == 0 && frame.Length < RTP_MAX_PAYLOAD)
                        {
                            // First and last RTP packet in the frame.
                            h264Header = new byte[] { 0x1c, 0x49 };
                            rtpPacket.Header.MarkerBit = 1;
                        }
                        else if (index == 0)
                        {
                            h264Header = new byte[] { 0x1c, 0x89 };
                        }
                        else if ((index + 1) * RTP_MAX_PAYLOAD > frame.Length)
                        {
                            h264Header = new byte[] { 0x1c, 0x49 };
                            rtpPacket.Header.MarkerBit = 1;
                        }

                        var h264Stream = frame.Skip(index * RTP_MAX_PAYLOAD).Take(payloadLength).ToList();
                        h264Stream.InsertRange(0, h264Header);
                        rtpPacket.Payload = h264Stream.ToArray();

                        byte[] rtpBytes = rtpPacket.GetBytes();

                        //System.Diagnostics.Debug.WriteLine(" offset " + (index * RTP_MAX_PAYLOAD) + ", payload length " + payloadLength + ", sequence number " + rtpPacket.Header.SequenceNumber + ", marker " + rtpPacket.Header .MarkerBit + ".");

                        //Stopwatch sw = new Stopwatch();
                        //sw.Start();

                        _rtpSocket.SendTo(rtpBytes, rtpBytes.Length, SocketFlags.None, _remoteEndPoint);

                        //sw.Stop();

                        //if (sw.ElapsedMilliseconds > 15)
                        //{
                        //    logger.Warn(" SendH264Frame offset " + offset + ", payload length " + payloadLength + ", sequence number " + rtpPacket.Header.SequenceNumber + ", marker " + rtpPacket.Header.MarkerBit + ", took " + sw.ElapsedMilliseconds + "ms.");
                        //}
                    }
                }
            }
            catch (Exception excp)
            {
                if (!_isClosed)
                {
                    logger.Warn("Exception RTPChannel.SendH264Frame attempting to send to the RTP socket at " + _remoteEndPoint + ". " + excp);

                    OnRTPSocketDisconnected?.Invoke();
                }
            }
        }