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100 lines
2.7 KiB
100 lines
2.7 KiB
<!DOCTYPE html>
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<html lang="zh">
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<head>
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<meta charset="utf-8" />
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<base href="../../../" />
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<script src="page.js"></script>
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<link type="text/css" rel="stylesheet" href="page.css" />
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</head>
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<body>
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<h1>[name]</h1>
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<p class="desc">
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创建AudioAnalyser对象, 使用[link:https://developer.mozilla.org/en-US/docs/Web/API/AnalyserNode AnalyserNode]
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去分析音频数据.<br /><br />
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使用了 [link:https://developer.mozilla.org/en-US/docs/Web/API/Web_Audio_API Web Audio API].
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</p>
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<h2>代码示例</h2>
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<code>
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// create an AudioListener and add it to the camera
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const listener = new THREE.AudioListener();
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camera.add( listener );
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// create an Audio source
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const sound = new THREE.Audio( listener );
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// load a sound and set it as the Audio object's buffer
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const audioLoader = new THREE.AudioLoader();
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audioLoader.load( 'sounds/ambient.ogg', function( buffer ) {
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sound.setBuffer( buffer );
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sound.setLoop(true);
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sound.setVolume(0.5);
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sound.play();
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});
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// create an AudioAnalyser, passing in the sound and desired fftSize
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const analyser = new THREE.AudioAnalyser( sound, 32 );
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// get the average frequency of the sound
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const data = analyser.getAverageFrequency();
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</code>
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<h2>例子</h2>
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<p>
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[example:webaudio_sandbox webaudio / sandbox ]<br />
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[example:webaudio_visualizer webaudio / visualizer ]
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</p>
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<h2>构造函数</h2>
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<h3>[name]( audio, [link:https://developer.mozilla.org/en-US/docs/Web/API/AnalyserNode/fftSize fftSize] )</h3>
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<p>
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创建[page:AudioAnalyser AudioAnalyser].
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</p>
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<h2>属性</h2>
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<h3>[property:AnalyserNode analyser]</h3>
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<p>[link:https://developer.mozilla.org/en-US/docs/Web/API/AnalyserNode AnalyserNode]用来分析音频数据.</p>
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<h3>[property:Integer fftSize]</h3>
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<p>
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2的幂次方最高为2048, 用来表示确定频域的FFT (傅立叶变换)大小.
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这个[link:https://developer.mozilla.org/en-US/docs/Web/API/AnalyserNode/fftSize page]有详细信息.
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</p>
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<h3>[property:Uint8Array data]</h3>
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<p>
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用来分析数据的Uint8Array的大小由[link:https://developer.mozilla.org/en-US/docs/Web/API/AnalyserNode/frequencyBinCount analyser.frequencyBinCount]
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确定.
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</p>
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<h2>方法</h2>
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<h3>[method:Uint8Array getFrequencyData]()</h3>
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<p>
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使用网络音频的[link:https://developer.mozilla.org/en-US/docs/Web/API/AnalyserNode/getByteFrequencyData getByteFrequencyData] 方法.
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看这个页面.
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</p>
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<h3>[method:Number getAverageFrequency]()</h3>
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<p>
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通过方法[page:AudioAnalyser.getFrequencyData getFrequencyData]获取平均频率.
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</p>
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<h2>源码</h2>
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<p>
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[link:https://github.com/mrdoob/three.js/blob/master/src/[path].js src/[path].js]
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</p>
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</body>
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</html>
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