114 lines
3.7 KiB
C#
114 lines
3.7 KiB
C#
using NetMQ;
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using NetMQ.Sockets;
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using Newtonsoft.Json;
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using SHH.Contracts; // ★★★ 必须引用契约库 ★★★
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using System.Diagnostics;
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namespace SHH.CameraDashboard;
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public class StreamReceiverService : IDisposable
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{
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// 单例模式
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public static StreamReceiverService Instance { get; } = new StreamReceiverService();
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// ★★★ 核心变更：使用强类型契约载体 ★★★
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public event Action<VideoPayload>? OnPayloadReceived;
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private SubscriberSocket? _subSocket;
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private Task? _receiveTask;
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private CancellationTokenSource? _cts;
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public int ListenPort { get; private set; }
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// 运行状态检查
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public bool IsRunning => _receiveTask != null && !_receiveTask.IsCompleted;
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private StreamReceiverService() { }
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public void Start(int port = 6000)
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{
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if (IsRunning) return;
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ListenPort = port;
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_cts = new CancellationTokenSource();
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try
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{
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_subSocket = new SubscriberSocket();
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// 设置高水位，防止 UI 卡顿时内存溢出
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_subSocket.Options.ReceiveHighWatermark = 1000;
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_subSocket.Bind($"tcp://*:{ListenPort}");
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_subSocket.Subscribe(""); // 订阅所有内容（这是 Dealer-Router/Pub-Sub 的基础）
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Console.WriteLine($"[Dashboard] 视频流接收服务启动: tcp://*:{ListenPort}");
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}
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catch (Exception ex)
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{
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// 明确抛出异常，让 App.xaml.cs 知道启动失败了
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_subSocket?.Dispose();
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_subSocket = null;
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throw new Exception($"端口 {port} 绑定失败，可能被占用。", ex);
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}
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_receiveTask = Task.Run(ReceiveLoop, _cts.Token);
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}
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private void ReceiveLoop()
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{
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var token = _cts?.Token ?? CancellationToken.None;
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while (!token.IsCancellationRequested)
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{
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try
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{
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if (_subSocket == null) break;
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// =========================================================
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// 核心解析逻辑：适配 Service 端的 4 帧复合协议
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// =========================================================
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NetMQMessage msg = new NetMQMessage();
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// 1. 非阻塞接收多帧消息
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if (!_subSocket.TryReceiveMultipartMessage(TimeSpan.FromMilliseconds(500), ref msg))
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continue;
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// 2. 协议完整性检查
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if (msg.FrameCount < 4) continue;
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// 3. 协议头校验 (Frame 0)
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if (msg[0].ConvertToString() != "SHH_V1") continue;
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// 4. 反序列化元数据 (Frame 1)
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string json = msg[1].ConvertToString();
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var payload = JsonConvert.DeserializeObject<VideoPayload>(json);
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if (payload == null) continue;
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// 5. 填充二进制图像数据 (Frame 2 & 3)
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// 注意：NetMQ 的 msg 数据是非托管内存，转为 byte[] 实现了拷贝，安全供 UI 使用
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if (payload.HasOriginalImage)
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payload.OriginalImageBytes = msg[2].ToByteArray();
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if (payload.HasTargetImage)
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payload.TargetImageBytes = msg[3].ToByteArray();
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// 6. 触发事件
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OnPayloadReceived?.Invoke(payload);
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}
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catch (Exception ex)
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{
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Debug.WriteLine($"[Receiver Error] {ex.Message}");
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}
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}
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Console.WriteLine("[Dashboard] 接收循环已停止");
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}
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public void Stop()
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{
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_cts?.Cancel();
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try { _subSocket?.Dispose(); } catch { }
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_subSocket = null;
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_receiveTask = null;
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}
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public void Dispose() => Stop();
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} |