122 lines
4.8 KiB
C#
122 lines
4.8 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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public class BeatClock
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{
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int m_beatsPerBar; // 从 TimeSig 解析
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int m_barsPerGrid; // 从 Grid 字段读取
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double m_startDspTime, m_secondsPerBeat; // 本次计数周期的起点
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Coroutine m_beatCoroutine, m_barCoroutine, m_gridCoroutine;
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readonly Action<uint> m_onBeat, m_onBar, m_onGrid;
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readonly MonoBehaviour m_host;
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uint m_containerId;
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bool m_stopped, m_blendError; // 检测到 Blend 多 BPM 情况时置为 true
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internal BeatClock(MonoBehaviour host, Action<uint> onBeat, Action<uint> onBar, Action<uint> onGrid)
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{
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this.m_host = host;
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this.m_onBeat = onBeat;
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this.m_onBar = onBar;
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this.m_onGrid = onGrid;
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}
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public void Restart(MusicContainer container, float inheritedBpm, double dspTime)
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{
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//Debug.Log($"[BeatClock] Restart called, container={container.Id}, bpm={container.Bpm}, inherited={inheritedBpm}");
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StopAll();
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this.m_blendError = this.m_stopped = false;
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this.m_containerId = container.Id;
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this.m_startDspTime = dspTime;
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// BPM：优先用自己的，为 0 则用传入的继承值，最终回退 120
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float bpm = container.Bpm > 0f ? container.Bpm : inheritedBpm;
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if (bpm <= 30f) bpm = 120f; // 没见过速度小于30bpm的音乐，小于30要么是数填错了，要么是有奇怪的情况。要是真有这么慢的音乐再处理吧。
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this.m_secondsPerBeat = 60 / bpm;
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this.m_beatsPerBar = MusicContainerConfig.GetBeatsPerBar(container.TimeSig); // 沿用现有的解析逻辑
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this.m_barsPerGrid = container.Grid > 0 ? container.Grid : 4;
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this.m_beatCoroutine = this.m_host.StartCoroutine(BeatCoroutine());
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this.m_barCoroutine = this.m_host.StartCoroutine(BarCoroutine());
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this.m_gridCoroutine = this.m_host.StartCoroutine(GridCoroutine());
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}
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internal void OnBlendError(MusicContainer container)
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{
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this.m_blendError = true;
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Debug.LogWarning($"[Music System] Blend Container {container.Id} 包含多个不同 BPM 的子 Container，节拍回调已停止。");
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}
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internal void StopAll()
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{
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this.m_stopped = true;
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if (this.m_beatCoroutine != null) this.m_host.StopCoroutine(this.m_beatCoroutine);
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if (this.m_barCoroutine != null) this.m_host.StopCoroutine(this.m_barCoroutine);
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if (this.m_gridCoroutine != null) this.m_host.StopCoroutine(this.m_gridCoroutine);
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this.m_beatCoroutine = this.m_barCoroutine = this.m_gridCoroutine = null;
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}
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IEnumerator BeatCoroutine()
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{
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long index = 0; // 从第 1 拍开始，第 0 拍是起始点本身
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while (true)
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{
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double nextTime = this.m_startDspTime + index * this.m_secondsPerBeat;
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yield return new WaitUntil(() => AudioSettings.dspTime >= nextTime - 0.02);
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while (AudioSettings.dspTime < nextTime)
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yield return null;
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if (this.m_blendError || this.m_stopped){
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yield break;
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}
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this.m_onBeat?.Invoke(this.m_containerId);
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index++;
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}
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}
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IEnumerator BarCoroutine()
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{
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long index = 0;
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while (true)
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{
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double nextTime = this.m_startDspTime + index * this.m_secondsPerBeat * this.m_beatsPerBar;
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yield return new WaitUntil(() => AudioSettings.dspTime >= nextTime - 0.02);
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while (AudioSettings.dspTime < nextTime)
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yield return null;
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if (this.m_blendError || this.m_stopped){
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yield break;
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}
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this.m_onBar?.Invoke(this.m_containerId);
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index++;
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}
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}
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IEnumerator GridCoroutine()
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{
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long index = 0;
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while (true)
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{
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double nextTime = this.m_startDspTime + index * this.m_secondsPerBeat * this.m_beatsPerBar * this.m_barsPerGrid;
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yield return new WaitUntil(() => AudioSettings.dspTime >= nextTime - 0.02);
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while (AudioSettings.dspTime < nextTime)
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yield return null;
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if (this.m_blendError || this.m_stopped){
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yield break;
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}
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this.m_onGrid?.Invoke(this.m_containerId);
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index++;
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}
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}
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}
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}
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