99 lines
2.7 KiB
JavaScript
99 lines
2.7 KiB
JavaScript
/**
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* 简单的合成狗叫声
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* 使用 Web Audio API，无需外部音频文件
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*/
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let audioCtx = null;
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function getAudioContext() {
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if (!audioCtx) {
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const AC = window.AudioContext || window.webkitAudioContext;
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if (AC) {
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audioCtx = new AC();
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}
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}
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return audioCtx;
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}
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export default function playBark() {
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const ctx = getAudioContext();
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if (!ctx) return;
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// 如果 AudioContext 被暂停（某些浏览器/微信环境），先 resume
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if (ctx.state === 'suspended') {
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ctx.resume();
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}
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const now = ctx.currentTime;
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const duration = 0.18; // 吠叫持续约 180ms
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// 1. 噪声源（吠叫的嘶哑感）
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const sampleRate = ctx.sampleRate;
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const bufferSize = sampleRate * duration;
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const noiseBuffer = ctx.createBuffer(1, bufferSize, sampleRate);
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const output = noiseBuffer.getChannelData(0);
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for (let i = 0; i < bufferSize; i++) {
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output[i] = Math.random() * 2 - 1;
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}
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const noise = ctx.createBufferSource();
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noise.buffer = noiseBuffer;
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// 2. 带通滤波器，集中在 600-1200Hz 类似狗叫的频段
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const bandpass = ctx.createBiquadFilter();
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bandpass.type = 'bandpass';
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bandpass.frequency.value = 900;
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bandpass.Q.value = 0.8;
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// 3. 低频振荡器（吠叫的胸腔共鸣感）
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const osc = ctx.createOscillator();
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osc.type = 'sawtooth';
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osc.frequency.setValueAtTime(180, now);
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osc.frequency.exponentialRampToValueAtTime(120, now + duration);
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const oscGain = ctx.createGain();
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oscGain.gain.value = 0.25;
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// 4. 主音量包络：快速Attack，快速Decay
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const masterGain = ctx.createGain();
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masterGain.gain.setValueAtTime(0, now);
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masterGain.gain.linearRampToValueAtTime(0.6, now + 0.02);
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masterGain.gain.exponentialRampToValueAtTime(0.01, now + duration);
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// 连接
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noise.connect(bandpass);
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bandpass.connect(masterGain);
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osc.connect(oscGain);
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oscGain.connect(masterGain);
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masterGain.connect(ctx.destination);
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// 播放
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noise.start(now);
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noise.stop(now + duration);
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osc.start(now);
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osc.stop(now + duration);
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}
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export function playWinSound() {
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const ctx = getAudioContext();
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if (!ctx) return;
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if (ctx.state === 'suspended') ctx.resume();
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const now = ctx.currentTime;
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const notes = [523.25, 659.25, 783.99, 1046.50]; // C E G C'
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notes.forEach((freq, i) => {
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const osc = ctx.createOscillator();
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osc.type = 'sine';
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osc.frequency.value = freq;
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const gain = ctx.createGain();
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gain.gain.setValueAtTime(0, now + i * 0.1);
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gain.gain.linearRampToValueAtTime(0.2, now + i * 0.1 + 0.02);
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gain.gain.exponentialRampToValueAtTime(0.01, now + i * 0.1 + 0.25);
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osc.connect(gain);
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gain.connect(ctx.destination);
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osc.start(now + i * 0.1);
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osc.stop(now + i * 0.1 + 0.3);
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});
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}
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