copy/paste from stack overflow

2 years ago · 655ea6aeb0
parent e75a3b82d9
commit 655ea6aeb0
3 changed files with 45 additions and 0 deletions
--- a/README.md
+++ b/README.md
@ -0,0 +1,5 @@
+# Mic Measurement
+
+## Help
+
+- https://stackoverflow.com/questions/33322681/checking-microphone-volume-in-javascript
--- a/app.js
+++ b/app.js
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+navigator.mediaDevices.getUserMedia({
+	audio: true,
+	video: true
+})
+	.then(function(stream) {
+		const audioContext = new AudioContext();
+		const analyser = audioContext.createAnalyser();
+		const microphone = audioContext.createMediaStreamSource(stream);
+		const scriptProcessor = audioContext.createScriptProcessor(2048, 1, 1);
+
+		analyser.smoothingTimeConstant = 0.8;
+		analyser.fftSize = 1024;
+
+		microphone.connect(analyser);
+		analyser.connect(scriptProcessor);
+		scriptProcessor.connect(audioContext.destination);
+		scriptProcessor.onaudioprocess = function() {
+			const array = new Uint8Array(analyser.frequencyBinCount);
+			analyser.getByteFrequencyData(array);
+			const arraySum = array.reduce((a, value) => a + value, 0);
+			const average = arraySum / array.length;
+			console.log(Math.round(average));
+			// colorPids(average);
+		};
+	})
+	.catch(function(err) {
+		/* handle the error */
+		console.error(err);
+	});
--- a/index.html
+++ b/index.html
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+<!DOCTYPE html>
+<html lang="en">
+<head>
+	<meta charset="UTF-8">
+	<title></title>
+	<script src="app.js"></script>
+</head>
+<body>
+	
+</body>
+</html>