From e79c57a40fcdbb831ca1f4b2d638b585819cf822 Mon Sep 17 00:00:00 2001
From: CL <62653664+Chen-Luan@users.noreply.github.com>
Date: Mon, 23 Mar 2026 17:18:12 +0800
Subject: [PATCH] =?UTF-8?q?feat:=20=E6=B7=BB=E5=8A=A0=E5=B8=A6=E5=B9=B3?=
 =?UTF-8?q?=E6=BB=91=E7=9A=84DSP=E8=AE=A1=E6=97=B6=E5=99=A8?=
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---
 .../Scripts/Framework/Timer/SmoothDspTimer.cs | 119 ++++++++++++++++++
 .../Framework/Timer/SmoothDspTimer.cs.meta    |   2 +
 2 files changed, 121 insertions(+)
 create mode 100644 Cyan-Stars/Assets/Scripts/Framework/Timer/SmoothDspTimer.cs
 create mode 100644 Cyan-Stars/Assets/Scripts/Framework/Timer/SmoothDspTimer.cs.meta

diff --git a/Cyan-Stars/Assets/Scripts/Framework/Timer/SmoothDspTimer.cs b/Cyan-Stars/Assets/Scripts/Framework/Timer/SmoothDspTimer.cs
new file mode 100644
index 000000000..464d9ae2a
--- /dev/null
+++ b/Cyan-Stars/Assets/Scripts/Framework/Timer/SmoothDspTimer.cs
@@ -0,0 +1,119 @@
+#nullable enable
+
+using System;
+using UnityEngine;
+
+namespace CyanStars.Framework.Timer
+{
+    public class SmoothDspTimer
+    {
+        /* DspTimerManager 计算逻辑：
+         * Manager 时间以 AudioSetting.dspTime 为准
+         * 但是 dspTime 不保证每帧更新，而下游需要每帧获取时间变化量
+         * 因此在 dspTime 没有刷新的间隔内，暂且采用 Time.unscaledDeltaTime 作为差值，牺牲一些精度来换取每帧更新
+         * 一旦 dspTime 发生更新，计算当前累计时间和 dspTime 的误差，并在后续的每帧更新中逐步抹平这些误差时间
+         */
+
+        /// <summary>
+        /// 阻尼系数，[0,1]
+        /// </summary>
+        /// <remarks>
+        /// 每秒抹除当前积累误差的几倍，就像半衰期一样
+        /// </remarks>
+        private const double ErrorCorrectionRatePerSecond = 0.2;
+
+        /// <summary>
+        /// 最大误差时间 (s)，[0,+∞)
+        /// </summary>
+        /// <remarks>
+        /// 若 currentTime 延后超过此误差值，则强制跳转到 dspTime；
+        /// 若 currentTime 提前超过此误差值，则停止 currentTime 更新直到误差小于范围
+        /// </remarks>
+        private const double MaxErrorTime = 1;
+
+
+        /// <summary>
+        /// 此 manager 实例记录的，经过矫正后的时间 (s)
+        /// </summary>
+        /// <remarks>
+        /// 每帧更新，用于在两个 dspTime 的间隔之间平滑差值；保证时间正向更新，不会在 dspTime 变化时发生时光倒流
+        /// </remarks>
+        private double currentTime;
+
+        /// <summary>
+        /// dspTime 上次更新时的值 (s)
+        /// </summary>
+        /// <remarks>
+        /// dspTime 更准确，但不保证每帧更新
+        /// </remarks>
+        private double previousDspTime;
+
+        /// <summary>
+        /// currentTime 与 previousDspTime 之间的误差时间，currentTime 提前时为负数 (s)
+        /// </summary>
+        /// <remarks>用于纠正 currentTime 的误差</remarks>
+        private double errorTime;
+
+        /// <summary>
+        /// 构造函数：为内部属性赋初始值
+        /// </summary>
+        public SmoothDspTimer()
+        {
+            Reset();
+        }
+
+        /// <summary>
+        /// 重置内部属性，遗忘之前记录的累计时间，在下次 Update() 时视为暂停后重新开始计时而不是试图纠正到暂停前的时间
+        /// </summary>
+        public void Reset()
+        {
+            currentTime = AudioSettings.dspTime;
+            previousDspTime = AudioSettings.dspTime;
+            errorTime = 0;
+        }
+
+        /// <summary>
+        /// 由调用者在进行计时时每帧驱动，返回平滑后的 deltaDspTime
+        /// </summary>
+        /// <remarks>
+        /// 在暂停后重新启动计时时，请先调用一次 Reset()，否则 SmoothDspTimer 将会把这个暂停理解成一个巨大的卡顿并返回很大的 deltaTime。
+        /// 首次启动也可以调用，避免实例化到首次调用之间的误差时间。
+        /// </remarks>
+        public double OnUpdate()
+        {
+            double smoothDeltaDspTime;
+            if (Math.Abs(AudioSettings.dspTime - previousDspTime) > 0.000001)
+            {
+                // dspTime 发生更新
+                previousDspTime = AudioSettings.dspTime;
+                errorTime = previousDspTime - currentTime;
+            }
+
+            if (errorTime > MaxErrorTime)
+            {
+                // 如果 managerTime 延后较大，则强制向前跳转以纠正误差
+                Debug.LogWarning($"{nameof(currentTime)} 误差达到 {errorTime}s，强制跳转时间到 {AudioSettings.dspTime}s。");
+                smoothDeltaDspTime = AudioSettings.dspTime - currentTime;
+                currentTime = AudioSettings.dspTime;
+                errorTime = 0;
+            }
+            else if (-errorTime > MaxErrorTime)
+            {
+                // 如果 managerTime 提前较大，则停止此帧更新以纠正误差
+                Debug.LogWarning($"{nameof(currentTime)} 误差达到 {errorTime}s，本帧停止更新。");
+                smoothDeltaDspTime = 0;
+            }
+            else
+            {
+                double frameCorrectionRate = 1.0 - Math.Pow(1.0 - ErrorCorrectionRatePerSecond, Time.unscaledDeltaTime);
+                double correctionTime = errorTime * frameCorrectionRate;
+                correctionTime = Math.Max(correctionTime, -Time.unscaledDeltaTime); // 修正之后的 deltaTime 必须为非负数
+                smoothDeltaDspTime = Time.unscaledDeltaTime + correctionTime;
+                errorTime -= correctionTime;
+                currentTime += smoothDeltaDspTime;
+            }
+
+            return smoothDeltaDspTime;
+        }
+    }
+}
diff --git a/Cyan-Stars/Assets/Scripts/Framework/Timer/SmoothDspTimer.cs.meta b/Cyan-Stars/Assets/Scripts/Framework/Timer/SmoothDspTimer.cs.meta
new file mode 100644
index 000000000..0a469d2bb
--- /dev/null
+++ b/Cyan-Stars/Assets/Scripts/Framework/Timer/SmoothDspTimer.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 81495774952449af9c0f47e3346b4988
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