86 lines
3.6 KiB
C#
86 lines
3.6 KiB
C#
namespace SHH.CameraSdk;
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/// <summary>
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/// 帧控制器(帧调度核心)
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/// 功能:管理订阅者的帧需求,基于需求动态判定每帧的处理命运(保留/丢弃、分发目标)
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/// 核心逻辑:采用“并集采样”策略,满足任意订阅者的帧率需求即保留帧,避免重复采样浪费资源
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/// </summary>
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public class FrameController
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{
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#region --- 私有资源与状态 (Private Resources & States) ---
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/// <summary> 订阅者帧需求集合(线程安全) </summary>
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/// <remarks> Key:订阅者AppId,Value:该订阅者的帧需求配置 </remarks>
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private readonly ConcurrentDictionary<string, FrameRequirement> _requirements = new();
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/// <summary> 全局决策序列号(原子递增,确保决策唯一标识) </summary>
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private long _globalSequence = 0;
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#endregion
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#region --- 需求管理 (Requirement Management) ---
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/// <summary>
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/// 注册/更新订阅者的帧需求
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/// 功能:新增订阅者需求或更新已有订阅者的目标帧率
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/// </summary>
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/// <param name="appId">订阅者唯一标识(如 "RemoteClient_01"、"AI_Behavior_Engine")</param>
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/// <param name="fps">目标帧率(单位:fps,需大于0,否则视为无效需求)</param>
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public void Register(string appId, int fps)
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{
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// 新增或更新需求:不存在则创建,存在则更新目标帧率
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_requirements.AddOrUpdate(appId,
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addValueFactory: _ => new FrameRequirement { AppId = appId, TargetFps = fps },
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updateValueFactory: (_, oldRequirement) =>
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{
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oldRequirement.TargetFps = fps;
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return oldRequirement;
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});
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}
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#endregion
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#region --- 帧决策生成 (Frame Decision Generation) ---
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/// <summary>
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/// [热路径] 判定当前物理帧是否需要保留并分发
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/// 核心逻辑:并集采样,只要任意订阅者达到采样间隔,就保留该帧并分发至对应订阅者
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/// </summary>
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/// <param name="currentTick">当前系统时间戳(单位:毫秒,建议使用 Environment.TickCount64)</param>
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/// <returns>帧决策结果(包含是否保留、分发目标等信息)</returns>
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public FrameDecision MakeDecision(long currentTick)
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{
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// 初始化决策对象,生成唯一序列号与时间戳
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var decision = new FrameDecision
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{
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Sequence = Interlocked.Increment(ref _globalSequence), // 原子递增,线程安全
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Timestamp = DateTime.Now
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};
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// 遍历所有订阅者需求,判定是否需要为该订阅者保留当前帧
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foreach (var req in _requirements.Values)
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{
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// 跳过无效需求(目标帧率≤0)
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if (req.TargetFps <= 0) continue;
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// 计算该订阅者的采样间隔(毫秒):1000ms / 目标帧率
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long interval = 1000 / req.TargetFps;
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// 判定是否达到采样时间:当前时间 - 上次采样时间 ≥ 采样间隔(允许1s内相位对齐,自动合并)
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if (currentTick - req.LastCaptureTick >= interval)
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{
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// 加入分发目标列表
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decision.TargetAppIds.Add(req.AppId);
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// 更新该订阅者的上次采样时间,避免重复采样
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req.LastCaptureTick = currentTick;
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}
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}
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// 判定是否保留该帧:存在分发目标则保留(IsCaptured=true),否则丢弃
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decision.IsCaptured = decision.TargetAppIds.Count > 0;
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return decision;
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}
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#endregion
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} |