WIP: Music callback

- 头几拍会抖动一下，导致对不上拍子

Assets/Scripts/OCES/Audio/HandWritten/LongAudio/MusicChannelPlayer.cs

@@ -1,3 +1,4 @@
+using System;
 using System.Collections;
 using UnityEngine;
 
@@ -7,12 +8,13 @@ namespace OCES.Audio
     /// 音乐通道播放器。
     /// 负责：切换目标 Container、等待节拍对齐、执行淡入淡出 Transition。
     /// </summary>
-    public class MusicChannelPlayer
+    class MusicChannelPlayer
     {
         readonly MusicContainerConfig m_containerConfig;
         readonly MusicTransitionConfig m_transitionConfig;
         readonly MonoBehaviour m_coroutineHost;
         readonly ChannelFader m_fader;
+        readonly BeatClock m_beatClock;
                 
         Coroutine m_currentFadeInCoroutine;
         Coroutine m_currentFadeOutCoroutine;
@@ -30,16 +32,23 @@ namespace OCES.Audio
         // 正在进行的 transition 协程（防止重叠）
         Coroutine m_transitionCoroutine;
 
-        public MusicChannelPlayer(
+        internal MusicChannelPlayer(
             MusicContainerConfig containerConfig,
             MusicTransitionConfig transitionConfig,
             MusicContainerPlayer player,
-            MonoBehaviour coroutineHost)
+            MonoBehaviour coroutineHost,
+            Action<uint> onBeat,
+            Action<uint> onBar,
+            Action<uint> onGrid)
         {
-            this.m_containerConfig   = containerConfig;
-            this.m_transitionConfig  = transitionConfig;
-            this.m_coroutineHost     = coroutineHost;
-            this.m_fader = new ChannelFader(player, coroutineHost);
+            this.m_containerConfig     = containerConfig;
+            this.m_transitionConfig    = transitionConfig;
+            this.m_coroutineHost       = coroutineHost;
+            this.m_fader               = new ChannelFader(player, coroutineHost);
+            this.m_beatClock           = new BeatClock(coroutineHost, onBeat, onBar, onGrid);
+            
+            player.OnContainerEntered += this.m_beatClock.Restart;
+            player.OnBlendError       += this.m_beatClock.OnBlendError;
         }
 
         // ─────────────────────────────────────────────
@@ -67,8 +76,10 @@ namespace OCES.Audio
         /// <summary>
         /// 立即停止当前播放（无淡出）
         /// </summary>
-        public void Stop()
+        internal void Stop()
         {
+            this.m_beatClock.StopAll();
+            
             if (this.m_transitionCoroutine != null)
                 this.m_coroutineHost.StopCoroutine(this.m_transitionCoroutine);
 
@@ -146,7 +157,7 @@ namespace OCES.Audio
             }
             else if (mode == AlignMode.Bar)
             {
-                int beatsPerBar = ParseBeatsPerBar(container.TimeSig);
+                int beatsPerBar = MusicContainerConfig.GetBeatsPerBar(container.TimeSig);
                 double secondsPerBar   = secondsPerBeat * beatsPerBar;
                 double barsElapsed     = elapsed / secondsPerBar;
                 double nextBar         = System.Math.Ceiling(barsElapsed);
@@ -155,18 +166,7 @@ namespace OCES.Audio
                     yield return new WaitForSeconds((float)waitSeconds);
             }
         }
-
-        /// <summary>
-        /// 解析拍号字符串（如 "4/4", "3/4"），返回每小节拍数。
-        /// </summary>
-        static int ParseBeatsPerBar(string timeSig)
-        {
-            if (string.IsNullOrEmpty(timeSig)) return 4;
-            string[] parts = timeSig.Split('/');
-            if (parts.Length >= 1 && int.TryParse(parts[0], out int beats))
-                return beats;
-            return 4;
-        }
+        
         // ─────────────────────────────────────────────
         // 工具
         // ─────────────────────────────────────────────