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50 lines
1.5 KiB
50 lines
1.5 KiB
let timerInterval = null;
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let startTime = null;
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let secondsToSubtract = 0;
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let micLevel = 0;
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navigator.mediaDevices.getUserMedia({
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audio: true
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}).then((stream) => {
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const audioContext = new AudioContext();
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const analyser = audioContext.createAnalyser();
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const microphone = audioContext.createMediaStreamSource(stream);
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const scriptProcessor = audioContext.createScriptProcessor(2048, 1, 1);
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analyser.smoothingTimeConstant = 0.8;
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analyser.fftSize = 1024;
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microphone.connect(analyser);
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analyser.connect(scriptProcessor);
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scriptProcessor.connect(audioContext.destination);
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setInterval(() => {
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const array = new Uint8Array(analyser.frequencyBinCount);
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analyser.getByteFrequencyData(array);
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const arraySum = array.reduce((a, value) => a + value, 0);
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micLevel = arraySum / array.length;
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document.querySelector('#mic').innerHTML = Math.round(micLevel);
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}, 1000)
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})
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.catch((err) => {
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console.error(err);
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});
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const updateTimerDisplay = ()=>{
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if(micLevel < 15){
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secondsToSubtract++;
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}
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const secondsSinceTimerStart = Math.floor((Date.now() - startTime)/1000);
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document.querySelector('#seconds').innerHTML = secondsSinceTimerStart;
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document.querySelector('#subtracted').innerHTML = secondsToSubtract;
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document.querySelector('#total').innerHTML = secondsSinceTimerStart - secondsToSubtract;
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}
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document.querySelector('#start').addEventListener('click', ()=>{
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startTime = Date.now();
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timerInterval = window.setInterval(updateTimerDisplay,1000);
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})
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document.querySelector('#stop').addEventListener('click', ()=>{
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window.clearInterval(timerInterval);
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})
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