zyt/TongjiUniApp/unpackage/dist/dev/mp-weixin/training/hooks/useMetronome.js

"use strict";
var __defProp = Object.defineProperty;
var __defNormalProp = (obj, key, value) => key in obj ? __defProp(obj, key, { enumerable: true, configurable: true, writable: true, value }) : obj[key] = value;
var __publicField = (obj, key, value) => {
  __defNormalProp(obj, typeof key !== "symbol" ? key + "" : key, value);
  return value;
};
const common_vendor = require("../../common/vendor.js");
class AudioPool {
  constructor(src, size, volume = 1) {
    __publicField(this, "list", []);
    __publicField(this, "cursor", 0);
    __publicField(this, "warmedUp", false);
    __publicField(this, "targetVolume", 1);
    this.src = src;
    this.size = size;
    this.targetVolume = volume;
  }
  create() {
    for (let i = 0; i < this.size; i++) {
      const ctx = common_vendor.index.createInnerAudioContext();
      ctx.src = this.src;
      ctx.obeyMuteSwitch = false;
      ctx.autoplay = false;
      ctx.volume = this.targetVolume;
      this.list.push(ctx);
    }
  }
  setVolume(volume) {
    this.targetVolume = Math.max(0, Math.min(1, volume));
    this.list.forEach((ctx) => {
      try {
        ctx.volume = this.targetVolume;
      } catch (_) {
      }
    });
  }
  /**
   * 预热：短暂播放,让音频文件下载/解码到内存
   * 真正首次 play 不会再卡冷启动
   */
  warmUp() {
    if (this.warmedUp)
      return;
    if (this.list.length === 0)
      this.create();
    this.list.forEach((ctx) => {
      try {
        ctx.volume = 0;
        ctx.play();
        setTimeout(() => {
          try {
            ctx.stop();
            ctx.volume = this.targetVolume;
          } catch (_) {
          }
        }, 60);
      } catch (_) {
      }
    });
    this.warmedUp = true;
  }
  play() {
    if (this.list.length === 0) {
      this.create();
      this.warmUp();
    }
    const ctx = this.list[this.cursor];
    this.cursor = (this.cursor + 1) % this.list.length;
    try {
      this.list.forEach((c) => {
        try {
          c.stop();
        } catch (_) {
        }
      });
      ctx.play();
    } catch (_) {
      try {
        ctx.play();
      } catch (__) {
      }
    }
  }
  destroy() {
    this.list.forEach((ctx) => {
      var _a;
      try {
        (_a = ctx.destroy) == null ? void 0 : _a.call(ctx);
      } catch (_) {
      }
    });
    this.list = [];
    this.warmedUp = false;
  }
}
const DEFAULT_CLICK_SRC = "https://gz-1349751149.cos.ap-guangzhou.myqcloud.com/uploads/file/20260526/20260526105128557ef8669.mp3";
function useMetronome(options = {}) {
  const {
    initialBpm = 80,
    bpmMin = 40,
    bpmMax = 240,
    clickSrc = DEFAULT_CLICK_SRC,
    accentSrc,
    poolSize = 4,
    volume = 1,
    silent = false,
    onBeat
  } = options;
  const bpm = common_vendor.ref(initialBpm);
  const isPlaying = common_vendor.ref(false);
  const beatIndex = common_vendor.ref(0);
  const isAccent = common_vendor.ref(false);
  const accentEveryRef = common_vendor.ref(options.accentEvery ?? 4);
  const intervalMs = common_vendor.computed(() => 6e4 / bpm.value);
  let clickPool = null;
  let accentPool = null;
  let timer = null;
  let nextTickAt = 0;
  const ensureAudio = () => {
    if (silent)
      return;
    if (!clickPool) {
      clickPool = new AudioPool(clickSrc, poolSize, volume);
      clickPool.warmUp();
    }
    if (accentSrc && !accentPool) {
      accentPool = new AudioPool(accentSrc, Math.max(2, Math.ceil(poolSize / 2)), volume);
      accentPool.warmUp();
    }
  };
  const playSound = (accent) => {
    if (accent && accentPool) {
      accentPool.play();
    } else if (clickPool) {
      clickPool.play();
    }
  };
  const tick = () => {
    if (!isPlaying.value)
      return;
    const every = Math.max(1, accentEveryRef.value);
    const accent = beatIndex.value % every === 0;
    isAccent.value = accent;
    playSound(accent);
    onBeat == null ? void 0 : onBeat(beatIndex.value, accent);
    beatIndex.value++;
    nextTickAt += intervalMs.value;
    const nextDelay = Math.max(0, nextTickAt - Date.now());
    timer = setTimeout(tick, nextDelay);
  };
  const start = () => {
    if (isPlaying.value)
      return;
    ensureAudio();
    isPlaying.value = true;
    beatIndex.value = 0;
    nextTickAt = Date.now();
    tick();
  };
  const stop = () => {
    isPlaying.value = false;
    if (timer) {
      clearTimeout(timer);
      timer = null;
    }
  };
  const setBpm = (val) => {
    bpm.value = Math.max(bpmMin, Math.min(bpmMax, Math.round(val)));
  };
  const setAccentEvery = (n) => {
    accentEveryRef.value = Math.max(1, Math.min(16, Math.round(n)));
    beatIndex.value = 0;
  };
  const updateAudioSrc = (newClickSrc, newAccentSrc) => {
    const wasPlaying = isPlaying.value;
    if (wasPlaying)
      stop();
    clickPool == null ? void 0 : clickPool.destroy();
    accentPool == null ? void 0 : accentPool.destroy();
    clickPool = null;
    accentPool = null;
    clickPool = new AudioPool(newClickSrc, poolSize);
    if (newAccentSrc) {
      accentPool = new AudioPool(newAccentSrc, Math.max(2, Math.ceil(poolSize / 2)));
    }
    const previewCtx = common_vendor.index.createInnerAudioContext();
    previewCtx.src = newClickSrc;
    previewCtx.obeyMuteSwitch = false;
    previewCtx.volume = 0.4;
    try {
      previewCtx.play();
      setTimeout(() => {
        var _a;
        try {
          (_a = previewCtx.destroy) == null ? void 0 : _a.call(previewCtx);
        } catch (_) {
        }
      }, 500);
    } catch (_) {
    }
    if (wasPlaying)
      start();
  };
  const preload = () => {
    try {
      common_vendor.index.setInnerAudioOption({
        obeyMuteSwitch: false,
        mixWithOther: true
      });
    } catch (_) {
    }
    ensureAudio();
  };
  common_vendor.onUnmounted(() => {
    stop();
    clickPool == null ? void 0 : clickPool.destroy();
    accentPool == null ? void 0 : accentPool.destroy();
    clickPool = null;
    accentPool = null;
  });
  return {
    bpm,
    isPlaying,
    beatIndex,
    isAccent,
    intervalMs,
    accentEvery: accentEveryRef,
    start,
    stop,
    setBpm,
    setAccentEvery,
    updateAudioSrc,
    preload
  };
}
exports.useMetronome = useMetronome;
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