c# 遠程監控（4） 接收端 RTP包重組 分屏顯示

我們在上一期使用RTP協議，並進行了配置，打包了視頻數據，這一期我們就對發送的數據進行重組，並顯示在接受端上。最后對其進行擴展，支持多客戶端視頻發送，並在接收端分屏顯示。完成遠程監控的模擬。

 

先來個效果圖吧

 

private bool NewRTPPacket(RTPPacket packet)
        {
            if (!Clients.ContainsKey(packet.SSRC))//如果接受端第一次接受到某源的數據，則加入到
            {
                if (Clients.Count < 4)//如果發送端為4，則丟棄包
                {
                    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)//如果已經發送完畢
            {
                //丟包檢測
                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();//清空緩存區
                    return true;
                }

                //1.包重組
                var count = Clients[packet.SSRC].Sum(rtpPacket => rtpPacket.DataSize);//數據總數

                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();//清空緩存區

                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;
        }

　　完整代碼可以到百度雲下載：包括發送端和接收端