63 lines
2.2 KiB
C#
63 lines
2.2 KiB
C#
using System.Threading.Channels;
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namespace SHH.CameraService;
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/// <summary>
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/// 视频数据高速通道
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/// <para>作用：解耦 采集线程(Producer) 和 发送线程(Consumer)</para>
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/// <para>特性：使用 BoundedChannel，当网络发送慢时，自动丢弃旧帧(DropOldest)，防止内存溢出。</para>
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/// </summary>
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public class VideoDataChannel
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{
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// 创建一个有限容量的通道 (容量 5)
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// 如果发送端太慢，这就满了，DropOldest 会丢弃最旧的帧，保证实时性
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private readonly Channel<VideoPayload> _channel = Channel.CreateBounded<VideoPayload>(
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new BoundedChannelOptions(5)
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{
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FullMode = BoundedChannelFullMode.DropOldest, // 核心策略：丢弃旧帧
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SingleReader = true, // 只有一个 ZeroMQWorker 在读
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SingleWriter = false //可能有多个相机线程在写
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});
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// ★★★ 新增：公开 Reader 属性，让外部可以直接调用 ReadAsync ★★★
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public ChannelReader<VideoPayload> Reader => _channel.Reader;
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/// <summary>
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/// 写入数据 (生产者调用)
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/// </summary>
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public ValueTask WriteAsync(VideoPayload payload)
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{
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return _channel.Writer.WriteAsync(payload);
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}
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/// <summary>
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/// 读取数据流 (消费者调用)
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/// </summary>
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public IAsyncEnumerable<VideoPayload> ReadAllAsync(CancellationToken ct)
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{
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return _channel.Reader.ReadAllAsync(ct);
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}
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}
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// 附带：如果您的项目中还没有定义 VideoPayload，这里是一个最小实现
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// 如果 SHH.Contracts 中已有，请忽略此类
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public class VideoPayload
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{
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/// <summary> 相机唯一标识 </summary>
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public string CameraId { get; set; } = string.Empty;
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/// <summary> 采集时间 </summary>
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public DateTime CaptureTime { get; set; }
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/// <summary> 发送时间 </summary>
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public DateTime DispatchTime { get; set; }
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/// <summary> 原始宽 </summary>
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public int OriginalWidth { get; set; }
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/// <summary> 原始高 </summary>
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public int OriginalHeight { get; set; }
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/// <summary> 已编码的图片数据 (JPG) </summary>
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public byte[] OriginalImageBytes { get; set; } = Array.Empty<byte>();
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} |