95 lines
3.3 KiB
C#
95 lines
3.3 KiB
C#
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using OpenCvSharp;
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namespace SHH.CameraSdk;
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/// <summary>
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/// [零延迟核心] 智能帧（内存复用+引用计数）
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/// 功能：封装 OpenCV Mat 实现物理内存复用，通过引用计数管理生命周期，避免 GC 频繁回收导致的性能抖动
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/// 特性：引用归零自动回池，全程无内存分配/释放开销，支撑高帧率实时流处理
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/// </summary>
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public class SmartFrame : IDisposable
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{
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#region --- 私有资源与状态 (Private Resources & States) ---
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/// <summary> 所属帧池：用于引用归零后自动回收复用 </summary>
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private readonly FramePool _pool;
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/// <summary> 引用计数器：线程安全，控制帧的生命周期 </summary>
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/// <remarks> 初始值 0，激活后设为 1；引用归零则自动回池 </remarks>
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private int _refCount = 0;
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#endregion
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#region --- 公共属性 (Public Properties) ---
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/// <summary> 帧数据物理内存载体（OpenCV Mat 对象） </summary>
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/// <remarks> 内存由帧池预分配，全程复用，不触发 GC </remarks>
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public Mat InternalMat { get; private set; }
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/// <summary> 帧激活时间戳（记录帧被取出池的时刻） </summary>
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public DateTime Timestamp { get; private set; }
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#endregion
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#region --- 构造与激活 (Constructor & Activation) ---
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/// <summary>
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/// 初始化智能帧（由帧池调用，外部禁止直接实例化）
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/// </summary>
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/// <param name="pool">所属帧池实例</param>
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/// <param name="width">帧宽度</param>
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/// <param name="height">帧高度</param>
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/// <param name="type">帧数据类型（如 MatType.CV_8UC3）</param>
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internal SmartFrame(FramePool pool, int width, int height, MatType type)
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{
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_pool = pool;
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// 预分配物理内存：内存块在帧池生命周期内复用，避免频繁申请/释放
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InternalMat = new Mat(height, width, type);
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}
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/// <summary>
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/// [生产者调用] 从帧池取出时激活帧
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/// 功能：初始化引用计数，标记激活时间戳
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/// </summary>
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public void Activate()
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{
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// 激活后引用计数设为 1，代表生产者（驱动/管道）持有该帧
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_refCount = 1;
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// 记录帧被取出池的时间，用于后续延迟计算
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Timestamp = DateTime.Now;
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}
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#endregion
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#region --- 引用计数管理 (Reference Count Management) ---
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/// <summary>
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/// [消费者调用] 增加引用计数
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/// 适用场景：帧需要被多模块同时持有（如同时分发到 UI 和 AI 分析）
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/// </summary>
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public void AddRef()
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{
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// 原子递增：线程安全，避免多线程竞争导致计数错误
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Interlocked.Increment(ref _refCount);
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}
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#endregion
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#region --- 释放与回池 (Disposal & Pool Return) ---
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/// <summary>
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/// [消费者调用] 释放引用计数
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/// 核心逻辑：引用归零后自动将帧归还至帧池，实现内存复用
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/// </summary>
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public void Dispose()
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{
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// 原子递减：线程安全，确保计数准确
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if (Interlocked.Decrement(ref _refCount) <= 0)
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{
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// 引用归零：所有消费者均已释放，将帧归还池复用
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_pool.Return(this);
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}
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}
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#endregion
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}
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