feat: 添加Hdmi视频串流后端
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234
server/src/Services/HttpHdmiVideoStreamService.cs
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234
server/src/Services/HttpHdmiVideoStreamService.cs
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using System.Net;
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using System.Collections.Concurrent;
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using Peripherals.HdmiInClient;
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namespace server.Services;
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public class HdmiVideoStreamEndpoint
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{
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public string BoardId { get; set; } = "";
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public string MjpegUrl { get; set; } = "";
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public string VideoUrl { get; set; } = "";
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public string SnapshotUrl { get; set; } = "";
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}
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public class HttpHdmiVideoStreamService : BackgroundService
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{
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private readonly NLog.Logger logger = NLog.LogManager.GetCurrentClassLogger();
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private HttpListener? _httpListener;
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private readonly int _serverPort = 4322;
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private readonly ConcurrentDictionary<string, HdmiIn> _hdmiInDict = new();
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private bool _isEnabled = true;
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public override async Task StartAsync(CancellationToken cancellationToken)
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{
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_httpListener = new HttpListener();
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_httpListener.Prefixes.Add($"http://*:{_serverPort}/");
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_httpListener.Start();
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logger.Info($"HDMI Video Stream Service started on port {_serverPort}");
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await base.StartAsync(cancellationToken);
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}
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protected override async Task ExecuteAsync(CancellationToken stoppingToken)
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{
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try
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{
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while (!stoppingToken.IsCancellationRequested)
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{
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HttpListenerContext? context = null;
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try
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{
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context = await _httpListener.GetContextAsync();
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}
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catch (ObjectDisposedException)
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{
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// Listener closed, exit loop
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break;
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}
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catch (HttpListenerException)
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{
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// Listener closed, exit loop
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break;
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}
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catch (Exception ex)
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{
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logger.Error(ex, "Error in GetContextAsync");
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break;
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}
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if (context != null)
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_ = HandleRequestAsync(context, stoppingToken);
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}
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}
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finally
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{
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_httpListener?.Close();
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logger.Info("HDMI Video Stream Service stopped.");
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}
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}
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public override async Task StopAsync(CancellationToken cancellationToken)
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{
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logger.Info("Stopping HDMI Video Stream Service...");
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_isEnabled = false;
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_httpListener?.Close(); // 立即关闭监听器，唤醒阻塞
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await base.StopAsync(cancellationToken);
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}
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// 获取/创建 HdmiIn 实例
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private HdmiIn? GetOrCreateHdmiIn(string boardId)
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{
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if (_hdmiInDict.TryGetValue(boardId, out var hdmiIn))
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return hdmiIn;
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var db = new Database.AppDataConnection();
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if (db == null)
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{
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logger.Error("Failed to create HdmiIn instance");
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return null;
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}
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var boardRet = db.GetBoardByID(Guid.Parse(boardId));
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if (!boardRet.IsSuccessful || !boardRet.Value.HasValue)
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{
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logger.Error($"Failed to get board with ID {boardId}");
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return null;
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}
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var board = boardRet.Value.Value;
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hdmiIn = new HdmiIn(board.IpAddr, board.Port, 0); // taskID 可根据实际需求调整
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_hdmiInDict[boardId] = hdmiIn;
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return hdmiIn;
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}
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private async Task HandleRequestAsync(HttpListenerContext context, CancellationToken cancellationToken)
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{
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var path = context.Request.Url?.AbsolutePath ?? "/";
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var boardId = context.Request.QueryString["boardId"];
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if (string.IsNullOrEmpty(boardId))
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{
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await SendErrorAsync(context.Response, "Missing boardId");
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return;
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}
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var hdmiIn = GetOrCreateHdmiIn(boardId);
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if (hdmiIn == null)
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{
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await SendErrorAsync(context.Response, "Invalid boardId or board not available");
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return;
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}
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if (path == "/snapshot")
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{
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await HandleSnapshotRequestAsync(context.Response, hdmiIn, cancellationToken);
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}
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else if (path == "/mjpeg")
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{
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await HandleMjpegStreamAsync(context.Response, hdmiIn, cancellationToken);
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}
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else if (path == "/video")
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{
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await SendVideoHtmlPageAsync(context.Response, boardId);
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}
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else
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{
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await SendIndexHtmlPageAsync(context.Response, boardId);
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}
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}
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private async Task HandleSnapshotRequestAsync(HttpListenerResponse response, HdmiIn hdmiIn, CancellationToken cancellationToken)
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{
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var frameResult = await hdmiIn.ReadFrame();
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if (frameResult.IsSuccessful)
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{
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response.ContentType = "image/jpeg";
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await response.OutputStream.WriteAsync(frameResult.Value, 0, frameResult.Value.Length, cancellationToken);
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}
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else
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{
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response.StatusCode = 500;
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await response.OutputStream.WriteAsync(System.Text.Encoding.UTF8.GetBytes("Failed to get snapshot"));
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}
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response.Close();
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}
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private async Task HandleMjpegStreamAsync(HttpListenerResponse response, HdmiIn hdmiIn, CancellationToken cancellationToken)
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{
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response.ContentType = "multipart/x-mixed-replace; boundary=--frame";
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while (!cancellationToken.IsCancellationRequested && _isEnabled)
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{
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var frameResult = await hdmiIn.ReadFrame();
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if (frameResult.IsSuccessful)
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{
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var header = $"--frame\r\nContent-Type: image/jpeg\r\nContent-Length: {frameResult.Value.Length}\r\n\r\n";
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await response.OutputStream.WriteAsync(System.Text.Encoding.ASCII.GetBytes(header));
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await response.OutputStream.WriteAsync(frameResult.Value, 0, frameResult.Value.Length, cancellationToken);
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await response.OutputStream.WriteAsync(System.Text.Encoding.ASCII.GetBytes("\r\n"));
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}
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await Task.Delay(33, cancellationToken); // ~30fps
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}
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response.Close();
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}
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private async Task SendVideoHtmlPageAsync(HttpListenerResponse response, string boardId)
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{
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string html = $@"<html><body>
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<h1>HDMI Video Stream for Board {boardId}</h1>
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<img src='/mjpeg?boardId={boardId}' />
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</body></html>";
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response.ContentType = "text/html";
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await response.OutputStream.WriteAsync(System.Text.Encoding.UTF8.GetBytes(html));
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response.Close();
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}
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private async Task SendIndexHtmlPageAsync(HttpListenerResponse response, string boardId)
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{
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string html = $@"<html><body>
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<h1>Welcome to HDMI Video Stream Service</h1>
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<a href='/video?boardId={boardId}'>View Video Stream for Board {boardId}</a>
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</body></html>";
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response.ContentType = "text/html";
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await response.OutputStream.WriteAsync(System.Text.Encoding.UTF8.GetBytes(html));
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response.Close();
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}
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private async Task SendErrorAsync(HttpListenerResponse response, string message)
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{
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response.StatusCode = 400;
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await response.OutputStream.WriteAsync(System.Text.Encoding.UTF8.GetBytes(message));
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response.Close();
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}
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public List<HdmiVideoStreamEndpoint>? GetAllVideoEndpoints()
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{
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var db = new Database.AppDataConnection();
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var boards = db?.GetAllBoard();
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if (boards == null)
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return null;
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var endpoints = new List<HdmiVideoStreamEndpoint>();
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foreach (var board in boards)
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{
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endpoints.Add(new HdmiVideoStreamEndpoint
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{
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BoardId = board.ID.ToString(),
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MjpegUrl = $"http://{Global.localhost}:{_serverPort}/mjpeg?boardId={board.ID}",
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VideoUrl = $"http://{Global.localhost}:{_serverPort}/video?boardId={board.ID}",
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SnapshotUrl = $"http://{Global.localhost}:{_serverPort}/snapshot?boardId={board.ID}"
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});
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}
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return endpoints;
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}
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public HdmiVideoStreamEndpoint GetVideoEndpoint(string boardId)
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{
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return new HdmiVideoStreamEndpoint
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{
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BoardId = boardId,
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MjpegUrl = $"http://{Global.localhost}:{_serverPort}/mjpeg?boardId={boardId}",
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VideoUrl = $"http://{Global.localhost}:{_serverPort}/video?boardId={boardId}",
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SnapshotUrl = $"http://{Global.localhost}:{_serverPort}/snapshot?boardId={boardId}"
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};
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}
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}
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