Created
April 4, 2020 07:41
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// source https://jsbin.com
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <meta name="viewport" content="width=device-width"> | |
| <title>JS Bin</title> | |
| <style id="jsbin-css"> | |
| #visualizer { | |
| background-color: #ddd; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <canvas id="visualizer"></canvas> | |
| <button type="button" id="start">start</button> | |
| <script id="jsbin-javascript"> | |
| window.AudioContext = window.AudioContext || window.webkitAudioContext; | |
| navigator.getUserMedia = navigator.getUserMedia || | |
| navigator.webkitGetUserMedia || | |
| navigator.mozGetUserMedia; | |
| var context = new AudioContext(); | |
| var analyser = context.createAnalyser(); | |
| var gain = context.createGain(); | |
| gain.gain.value = 0; | |
| analyser.fftSize = 2048; | |
| var frequencyData = new Float32Array(analyser.frequencyBinCount); | |
| analyser.connect(gain); | |
| gain.connect(context.destination); | |
| // Visualizer | |
| var analyzerSamples = analyser.frequencyBinCount; | |
| var canvas = document.querySelector("#visualizer"); | |
| var ctx = canvas.getContext("2d"); | |
| canvas.width = analyser.frequencyBinCount; | |
| canvas.height = 256; | |
| function showFrequency() { | |
| var inp = frequencyData; | |
| analyser.getFloatFrequencyData(inp); | |
| ctx.clearRect(0, 0, analyzerSamples, 256); | |
| ctx.beginPath(); | |
| ctx.moveTo(0.5, 255.5 - 255.5 * 20 * Math.pow(10, inp[0] / 20)); | |
| for (var i = 1; i < inp.length; i++) { | |
| ctx.lineTo(Math.log(i) * 120, 255.5 - 255.5 * 20 * Math.pow(10, inp[i] / 20)); | |
| } | |
| ctx.stroke(); | |
| } | |
| setInterval(showFrequency, 1000 / 50); | |
| document.getElementById('start').addEventListener('click', function() { | |
| navigator.getUserMedia({ | |
| audio: true, | |
| video: false | |
| }, function(stream) { | |
| var mic = context.createMediaStreamSource(stream); | |
| mic.connect(analyser); | |
| }, function(err) { | |
| throw new Error(err.name) | |
| }); | |
| }); | |
| </script> | |
| <script id="jsbin-source-css" type="text/css">#visualizer { | |
| background-color: #ddd; | |
| } | |
| </script> | |
| <script id="jsbin-source-javascript" type="text/javascript">window.AudioContext = window.AudioContext || window.webkitAudioContext; | |
| navigator.getUserMedia = navigator.getUserMedia || | |
| navigator.webkitGetUserMedia || | |
| navigator.mozGetUserMedia; | |
| var context = new AudioContext(); | |
| var analyser = context.createAnalyser(); | |
| var gain = context.createGain(); | |
| gain.gain.value = 0; | |
| analyser.fftSize = 2048; | |
| var frequencyData = new Float32Array(analyser.frequencyBinCount); | |
| analyser.connect(gain); | |
| gain.connect(context.destination); | |
| // Visualizer | |
| var analyzerSamples = analyser.frequencyBinCount; | |
| var canvas = document.querySelector("#visualizer"); | |
| var ctx = canvas.getContext("2d"); | |
| canvas.width = analyser.frequencyBinCount; | |
| canvas.height = 256; | |
| function showFrequency() { | |
| var inp = frequencyData; | |
| analyser.getFloatFrequencyData(inp); | |
| ctx.clearRect(0, 0, analyzerSamples, 256); | |
| ctx.beginPath(); | |
| ctx.moveTo(0.5, 255.5 - 255.5 * 20 * Math.pow(10, inp[0] / 20)); | |
| for (var i = 1; i < inp.length; i++) { | |
| ctx.lineTo(Math.log(i) * 120, 255.5 - 255.5 * 20 * Math.pow(10, inp[i] / 20)); | |
| } | |
| ctx.stroke(); | |
| } | |
| setInterval(showFrequency, 1000 / 50); | |
| document.getElementById('start').addEventListener('click', function() { | |
| navigator.getUserMedia({ | |
| audio: true, | |
| video: false | |
| }, function(stream) { | |
| var mic = context.createMediaStreamSource(stream); | |
| mic.connect(analyser); | |
| }, function(err) { | |
| throw new Error(err.name) | |
| }); | |
| }); | |
| </script></body> | |
| </html> |
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| #visualizer { | |
| background-color: #ddd; | |
| } |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| window.AudioContext = window.AudioContext || window.webkitAudioContext; | |
| navigator.getUserMedia = navigator.getUserMedia || | |
| navigator.webkitGetUserMedia || | |
| navigator.mozGetUserMedia; | |
| var context = new AudioContext(); | |
| var analyser = context.createAnalyser(); | |
| var gain = context.createGain(); | |
| gain.gain.value = 0; | |
| analyser.fftSize = 2048; | |
| var frequencyData = new Float32Array(analyser.frequencyBinCount); | |
| analyser.connect(gain); | |
| gain.connect(context.destination); | |
| // Visualizer | |
| var analyzerSamples = analyser.frequencyBinCount; | |
| var canvas = document.querySelector("#visualizer"); | |
| var ctx = canvas.getContext("2d"); | |
| canvas.width = analyser.frequencyBinCount; | |
| canvas.height = 256; | |
| function showFrequency() { | |
| var inp = frequencyData; | |
| analyser.getFloatFrequencyData(inp); | |
| ctx.clearRect(0, 0, analyzerSamples, 256); | |
| ctx.beginPath(); | |
| ctx.moveTo(0.5, 255.5 - 255.5 * 20 * Math.pow(10, inp[0] / 20)); | |
| for (var i = 1; i < inp.length; i++) { | |
| ctx.lineTo(Math.log(i) * 120, 255.5 - 255.5 * 20 * Math.pow(10, inp[i] / 20)); | |
| } | |
| ctx.stroke(); | |
| } | |
| setInterval(showFrequency, 1000 / 50); | |
| document.getElementById('start').addEventListener('click', function() { | |
| navigator.getUserMedia({ | |
| audio: true, | |
| video: false | |
| }, function(stream) { | |
| var mic = context.createMediaStreamSource(stream); | |
| mic.connect(analyser); | |
| }, function(err) { | |
| throw new Error(err.name) | |
| }); | |
| }); |
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