工作示例:https://codepen.io/anon/pen/RGmVgG
我有代码工作,可以获取实时麦克风输入数据并将其输出到系统默认扬声器。我已经确认我收到了数据。
然后我试图获取频率数据,但它返回-Infinity数组(或Firefox中的-100)。
我已经通过了MDN文档并且似乎已经准备好了所有内容,但我没有获得频率数据。知道我需要做些什么不同吗?
HTML
Audio Data:
<div id="audio-data"></div>
Frequency Data:
<div id="frequency-data"></div>
JS
window.addEventListener('load', () => {
navigator.mediaDevices.getUserMedia({audio: true})
.then((stream) => {
const audioDataDisplay = document.querySelector('#audio-data');
const frequencyDataDisplay = document.querySelector('#frequency-data');
const context = new AudioContext();
const source = context.createMediaStreamSource(stream);
const processor = context.createScriptProcessor(256, 1, 1);
source.connect(processor);
processor.connect(context.destination);
// route default microphone audio to default speaker output for system
// display live audio buffer data
processor.onaudioprocess = (data) => {
const channelCount = data.outputBuffer.numberOfChannels;
for (let i = 0; i < channelCount; i++) {
const inputChannelData = data.inputBuffer.getChannelData(i);
const outputChannelData = data.outputBuffer.getChannelData(i);
for (let j = 0; j < inputChannelData.length; j++) {
outputChannelData[j] = inputChannelData[j];
}
audioDataDisplay.innerHTML = outputChannelData;
}
}
// analyze the frequency data and display data
// only shows as an array of -Infinity in Chrome, -100 in Firefox.
const analyser = context.createAnalyser();
const dataArray = new Float32Array(analyser.frequencyBinCount);
setInterval(() => {
analyser.getFloatFrequencyData(dataArray);
frequencyDataDisplay.innerHTML = dataArray;
}, 1000);
});
});
答案 0 :(得分:2)
您永远不会将任何内容连接到分析仪节点。添加类似
的内容 source.connect(analyser);
创建分析器后。