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chore(HTML): 更新 audio-visualization/2.html

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Frost-ZX
2026-07-06 22:25:39 +08:00
parent 5a65a4ae1f
commit d5e665f349
1 changed files with 48 additions and 2 deletions
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HTML/audio-visualization/2.html
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@@ -182,6 +182,27 @@
color: var(--vfd-glow);
text-shadow: 0 0 14px var(--vfd-glow);
}
/* FFT 数值可用鼠标滚轮调整：需重新开启指针事件并给出可交互提示 */
#stFft {
pointer-events: auto;
cursor: ns-resize;
user-select: none;
}
/* 悬浮时以 1s 为周期循环闪烁，提示该数值可交互 */
#stFft:hover {
animation: fftBlink 1s ease-in-out infinite;
}
@keyframes fftBlink {
0%, 100% {
opacity: 1;
}
50% {
opacity: 0.25;
}
}
</style>
</head>
<body>
@@ -262,6 +283,10 @@
let running = false;
let sampleRate = 44100; // 采样率，用于频率/音符换算
// 当前 FFT 大小（可用鼠标滚轮在 FFT 数值上调整），128 ~ 8192 之间的 2 的幂
const FFT_MIN = 128, FFT_MAX = 8192;
let fftSize = 512; // 影响音符识别，值为 4096 时效果较好
async function initMic() {
if (running) return;
try {
@@ -269,7 +294,7 @@
audioCtx = new (window.AudioContext || window.webkitAudioContext)();
const src = audioCtx.createMediaStreamSource(stream);
analyser = audioCtx.createAnalyser();
analyser.fftSize = 512; // 影响音符识别，值为 4096 时效果较好
analyser.fftSize = fftSize;
analyser.smoothingTimeConstant = 0.8;
analyser.minDecibels = -85; // 拓宽动态范围，避免频谱条轻易撑满
analyser.maxDecibels = -10;
@@ -311,6 +336,27 @@
else initMic();
});
// 应用新的 FFT 大小：限制在 [128, 8192] 的 2 的幂之间，运行中则实时生效
function applyFftSize(next) {
next = Math.min(FFT_MAX, Math.max(FFT_MIN, next));
if (next === fftSize) return;
fftSize = next;
if (running && analyser) {
analyser.fftSize = fftSize;
// fftSize 变化后需重建数据缓冲区与频段索引
freqData = new Uint8Array(analyser.frequencyBinCount);
timeData = new Uint8Array(analyser.fftSize);
bands = null;
}
elFft.textContent = fftSize + "";
}
// 鼠标在 FFT 数值上滚动：向上放大 1 倍，向下缩小 1/2
elFft.addEventListener("wheel", (e) => {
e.preventDefault();
applyFftSize(e.deltaY < 0 ? fftSize * 2 : fftSize / 2);
}, { passive: false });
// ---------- 全屏 ----------
fsBtn.addEventListener("click", () => {
if (!document.fullscreenElement) {
@@ -607,7 +653,7 @@
elTime.textContent = new Date().toTimeString().slice(0, 8);
elPeak.textContent = f > 0 ? f.toFixed(0) : "---";
elLevel.textContent = isFinite(db) ? db.toFixed(1) : "-inf";
elFft.textContent = running ? analyser.fftSize + "" : "----";
elFft.textContent = fftSize + "";
// 高亮当前音符与八度
noteCells.forEach((el, i) => el.classList.toggle("active", i === activeNote));