235 lines
10 KiB
C#
235 lines
10 KiB
C#
using System;
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using System.Collections;
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using UnityEngine;
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namespace OCES.Audio
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{
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/// <summary>
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/// 音乐通道播放器。
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/// 负责：切换目标 Container、等待节拍对齐、执行淡入淡出 Transition。
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/// </summary>
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class MusicChannelPlayer
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{
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readonly MusicContainerConfig m_containerConfig;
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readonly MusicTransitionConfig m_transitionConfig;
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readonly MonoBehaviour m_coroutineHost;
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readonly ChannelFader m_fader;
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readonly BeatClock m_beatClock;
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Coroutine m_currentFadeInCoroutine;
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Coroutine m_currentFadeOutCoroutine;
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// 当前正在播放的句柄
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ContainerPlayHandle m_currentHandle;
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uint m_currentContainerId;
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// 当前播放的 Container（用于读取 bpm/timeSig 做节拍对齐）
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MusicContainer m_currentContainer;
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// 当前播放开始的时间（用于计算当前播到哪个拍子）
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double m_playStartTime;
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// 正在进行的 transition 协程（防止重叠）
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Coroutine m_transitionCoroutine;
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internal MusicChannelPlayer(
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MusicContainerConfig containerConfig,
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MusicTransitionConfig transitionConfig,
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MusicContainerPlayer player,
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MonoBehaviour coroutineHost,
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Action<uint> onBeat,
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Action<uint> onBar,
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Action<uint> onGrid)
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{
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this.m_containerConfig = containerConfig;
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this.m_transitionConfig = transitionConfig;
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this.m_coroutineHost = coroutineHost;
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this.m_fader = new ChannelFader(player, coroutineHost);
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this.m_beatClock = new BeatClock(coroutineHost, onBeat, onBar, onGrid);
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player.OnBlendError += this.m_beatClock.OnBlendError;
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}
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// ─────────────────────────────────────────────
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// 公开接口
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// ─────────────────────────────────────────────
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/// <summary>
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/// 切换到新的 Container。
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/// fromPathId / toPathId 用于查询 Transition 配置。
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/// </summary>
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internal void SwitchTo(uint newContainerId, uint fromPathId, uint toPathId)
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{
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if (newContainerId == this.m_currentContainerId && this.m_currentHandle != null)
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return; // 已经在播目标，无需切换
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MusicTransition transition = ResolveTransition(fromPathId, toPathId);
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if (this.m_transitionCoroutine != null)
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this.m_coroutineHost.StopCoroutine(this.m_transitionCoroutine);
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this.m_transitionCoroutine = this.m_coroutineHost.StartCoroutine(
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DoTransition(newContainerId, transition));
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}
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/// <summary>
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/// 立即停止当前播放（无淡出）
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/// </summary>
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internal void Stop()
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{
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this.m_beatClock.StopAll();
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if (this.m_transitionCoroutine != null)
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this.m_coroutineHost.StopCoroutine(this.m_transitionCoroutine);
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this.m_fader.StopCurrent();
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}
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// ─────────────────────────────────────────────
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// Transition 流程
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// ─────────────────────────────────────────────
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IEnumerator DoTransition(uint newContainerId, MusicTransition transition)
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{
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if (this.m_currentFadeInCoroutine != null)
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{
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this.m_coroutineHost.StopCoroutine(this.m_currentFadeInCoroutine);
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this.m_currentFadeInCoroutine = null;
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}
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if (this.m_currentFadeOutCoroutine != null)
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{
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this.m_coroutineHost.StopCoroutine(this.m_currentFadeOutCoroutine);
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this.m_currentFadeOutCoroutine = null;
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}
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// ── 构建 SyncPoint 状态 ──
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SyncPointState syncState = new()
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{
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Mode = transition?.SyncPoint ?? SyncPoint.Start,
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Ready = false,
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};
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//Debug.Log($"[MusicChannelPlayer] DoTransition: transition?.SyncPoint={transition?.SyncPoint}, Mode={syncState.Mode}");
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if (syncState.Mode == SyncPoint.SameAsCurrentSegment)
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{
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// 旧 Container 不存在（如游戏首次启动），静默降级为 Start
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if (this.m_fader.CurrentHandle == null)
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{
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syncState.Mode = SyncPoint.Start;
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}
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// Blend 类型不支持 SameAsCurrentSegment，降级为 Start
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else if (this.m_currentContainer is { ContainerType: ContainerType.Blend })
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{
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Debug.LogWarning($"[MusicChannelPlayer] SyncPoint.SameAsCurrentSegment 不支持 Blend 类型 Container({this.m_currentContainer.Id})，降级为 Start");
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syncState.Mode = SyncPoint.Start;
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}
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else
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{
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AudioSource oldSource = this.m_fader.CurrentHandle.GetFirstLeafSource();
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if (oldSource && oldSource.clip)
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{
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syncState.BaseTimeSamples = oldSource.timeSamples;
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syncState.BaseDspTime = AudioSettings.dspTime;
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syncState.SampleRate = oldSource.clip.frequency;
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}
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else
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{
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Debug.LogWarning("[MusicChannelPlayer] SameAsCurrentSegment: 旧 Source 不存在，降级为 Start");
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syncState.Mode = SyncPoint.Start;
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}
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}
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}
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// ── 1. 等待节拍对齐（由 Transition 的 AlignMode 决定）──
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if (transition != null && this.m_currentContainer != null)
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{
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yield return this.m_coroutineHost.StartCoroutine(
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WaitForAlignment(transition.AlignMode, this.m_currentContainer));
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}
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// ── 2 & 3. 淡出与淡入并行：两条分支从同一时刻起算各自的 Offset，互不等待 ──
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if (newContainerId == this.m_fader.CurrentContainerId && this.m_fader.CurrentHandle != null) yield break;
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// 如果等待期间被切回来了，就不淡变了
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ContainerPlayHandle outgoing = this.m_fader.CurrentHandle;
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float outVol = this.m_fader.CurrentVolume;
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this.m_currentFadeOutCoroutine = this.m_coroutineHost.StartCoroutine(
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this.m_fader.FadeOutBranch(outgoing, outVol, transition, syncState));
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this.m_currentFadeInCoroutine = this.m_coroutineHost.StartCoroutine(
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this.m_fader.FadeInBranch(newContainerId, transition, syncState,
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onContainerStarted: () =>
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{
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MusicContainer container = this.m_containerConfig.QueryById(newContainerId);
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float bpm = container.Bpm;
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// SyncPoint: BeatClock 用调整后的 dspTime，对齐到音频实际播放位置
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double dspTime;
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if (syncState is { Mode: SyncPoint.SameAsCurrentSegment })
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{
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double elapsedSeconds = AudioSettings.dspTime - syncState.BaseDspTime;
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int elapsedSamples = (int)(elapsedSeconds * syncState.SampleRate);
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double audioTime = (double)(syncState.BaseTimeSamples + elapsedSamples) / syncState.SampleRate;
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dspTime = AudioSettings.dspTime - audioTime;
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}
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else
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{
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dspTime = AudioSettings.dspTime;
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}
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this.m_currentContainer = container;
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this.m_playStartTime = dspTime;
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this.m_beatClock.Restart(container, bpm, dspTime);
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}));
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yield return this.m_currentFadeInCoroutine;
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this.m_currentFadeInCoroutine = null;
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}
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// ─────────────────────────────────────────────
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// 节拍对齐等待
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// ─────────────────────────────────────────────
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IEnumerator WaitForAlignment(AlignMode mode, MusicContainer container)
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{
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if (mode == AlignMode.Immediate || container.Bpm <= 0f)
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yield break;
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double target = this.m_beatClock.GetNextDspTime(mode);
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yield return new WaitUntil(() => AudioSettings.dspTime >= target);
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}
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// ─────────────────────────────────────────────
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// 工具
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// ─────────────────────────────────────────────
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/// <summary>
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/// 查询 Transition 配置，支持精确匹配和 999 通配符。
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/// ID 规则：FromPathId × 1000 + ToPathId，999 表示任意。
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/// </summary>
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MusicTransition ResolveTransition(uint fromPathId, uint toPathId)
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{
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// 优先精确匹配
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uint exactId = fromPathId * 1000 + toPathId;
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MusicTransition exact = this.m_transitionConfig.QueryById(exactId);
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if (exact != null) return exact;
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// From 为任意
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uint fromWildcard = 999u * 1000 + toPathId;
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MusicTransition fromWild = this.m_transitionConfig.QueryById(fromWildcard);
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if (fromWild != null) return fromWild;
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// To 为任意
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uint toWildcard = fromPathId * 1000 + 999u;
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MusicTransition toWild = this.m_transitionConfig.QueryById(toWildcard);
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if (toWild != null) return toWild;
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// 全通配
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const uint allWild = 999u * 1000 + 999u;
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return this.m_transitionConfig.QueryById(allWild);
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}
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}
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}
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