97 lines
3.2 KiB
C#
97 lines
3.2 KiB
C#
using System.Windows;
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using System.Windows.Media.Imaging;
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using SHH.Contracts; // ★★★ 引用契约库 (VideoPayload) ★★★
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namespace SHH.CameraDashboard;
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public class VideoTileViewModel : ViewModelBase
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{
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private readonly string _boundCameraId;
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// --- 属性定义 (保持不变) ---
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private string _cameraName;
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public string CameraName
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{
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get => _cameraName;
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set { _cameraName = value; OnPropertyChanged(); }
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}
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private string _statusInfo;
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public string StatusInfo
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{
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get => _statusInfo;
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set { _statusInfo = value; OnPropertyChanged(); }
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}
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private BitmapImage _videoSource;
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public BitmapImage VideoSource
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{
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get => _videoSource;
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set { _videoSource = value; OnPropertyChanged(); }
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}
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// --- 构造函数 ---
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public VideoTileViewModel(string cameraId, string name)
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{
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_boundCameraId = cameraId;
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CameraName = name;
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StatusInfo = "等待信号...";
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// ★★★ 变更 1: 订阅新的 OnPayloadReceived 事件 ★★★
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// 旧的 OnFrameReceived(string, byte[]) 已经无法满足需求
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StreamReceiverService.Instance.OnPayloadReceived += OnPayloadReceived;
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}
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// --- 事件回调 (后台线程) ---
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// ★★★ 变更 2: 参数变为 VideoPayload 实体对象 ★★★
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private void OnPayloadReceived(VideoPayload payload)
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{
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// 1. 过滤：校验 Payload 中的 CameraId
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if (payload.CameraId != _boundCameraId) return;
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// 2. ★★★ 智能选图策略 ★★★
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// 优先显示 AI 处理后的图 (TargetImageBytes)
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// 如果没有处理图，则降级显示原始图 (OriginalImageBytes)
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byte[] dataToShow = null;
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if (payload.HasTargetImage && payload.TargetImageBytes != null)
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{
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dataToShow = payload.TargetImageBytes;
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}
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else if (payload.HasOriginalImage && payload.OriginalImageBytes != null)
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{
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dataToShow = payload.OriginalImageBytes;
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}
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// 如果两张图都没有，直接返回
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if (dataToShow == null || dataToShow.Length == 0) return;
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// 3. 解码图片 (耗时操作在后台完成)
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var bitmap = BitmapHelper.ToBitmapImage(dataToShow);
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if (bitmap == null) return;
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// 4. ★★★ 计算端到端延迟 ★★★
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// 当前时间(接收端) - 采集时间(发送端) = 真实的网络+处理延迟
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long latency = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds() - payload.CaptureTimestamp;
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// 5. UI 更新
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Application.Current.Dispatcher.InvokeAsync(() =>
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{
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VideoSource = bitmap;
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// 显示更丰富的信息：延迟毫秒数、数据量、当前时间
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// 工业监控中，"延迟(ms)" 是比 "当前时间" 更重要的指标
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StatusInfo = $"延迟: {latency}ms | {dataToShow.Length / 1024} KB | {DateTime.Now:HH:mm:ss}";
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});
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}
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// --- 资源清理 ---
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public void Unload()
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{
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// ★★★ 变更 3: 取消订阅新的事件 ★★★
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StreamReceiverService.Instance.OnPayloadReceived -= OnPayloadReceived;
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// 清空图片引用，帮助 GC 回收内存
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VideoSource = null;
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}
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} |