private bool NewRTPPacket(RTPPacket packet)

        {

            if (!Clients.ContainsKey(packet.SSRC))//如果接受端第一次接受到某源的数据，则加入到

            {

                if (Clients.Count < 4)//如果发送端为4，则丢弃包

                {

                    Clients.Add(packet.SSRC, new List<RTPPacket> {packet});

                    ImagesBoxMapping[ImagesBoxMapping.First(pair => pair.Value == null).Key] = packet.SSRC;

                }

            }

            else

            {

                Clients[packet.SSRC].Add(packet);

            }

            if (packet.Marker)//如果已经发送完毕

            {

                //丢包检测

                var orderPackets = Clients[packet.SSRC].OrderBy(rtpPacket => rtpPacket.SequenceNumber);

                if (Clients[packet.SSRC].Count != (orderPackets.Last().SequenceNumber - orderPackets.First().SequenceNumber + 1))

                {

                    Clients[packet.SSRC].Clear();//清空缓存区

                    return true;

                }

                //1.包重组

                var count = Clients[packet.SSRC].Sum(rtpPacket => rtpPacket.DataSize);//数据总数

                var newData = new byte[count];

                long offSet = 0;

                foreach (var rtpPacket in Clients[packet.SSRC])

                {

                    Array.Copy(rtpPacket.DataPointer, 0, newData, offSet, rtpPacket.DataSize);

                    offSet += rtpPacket.DataSize;

                }

                Clients[packet.SSRC].Clear();//清空缓存区

                var ms = new MemoryStream(newData);

                try

                {

                    var bmp = new Bitmap(Image.FromStream(ms));

                    var img = new Image<Bgr, Byte>(bmp);

                    ImagesBoxMapping.First(pair => pair.Value == packet.SSRC).Key.Image = img;

                }

                catch (Exception)

                {

                }

                finally

                {

                    ms.Close();

                }

            }

            return true;

        }