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November 13, 2016 21:47
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Feedback audio
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| <html> | |
| <body> | |
| <button onclick="window.feedbackAudio.success();">Success</button> | | |
| <button onclick="window.feedbackAudio.attention();">Attention</button> | | |
| <button onclick="window.feedbackAudio.sad();">Sad</button> | |
| <script src="audio.js"></script> | |
| </body> | |
| </html> |
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| (function() { | |
| // http://marcgg.com/blog/2016/11/01/javascript-audio/ | |
| const audioInit = function audioInit() { | |
| try { | |
| window.AudioContext = window.AudioContext || window.webkitAudioContext; | |
| } | |
| catch(e) { | |
| // Web Audio API is not supported in this browser | |
| } | |
| }; | |
| const activeAudio = []; | |
| let activeTone = null; | |
| const play = function play(frequency, type='sine', maxGain=0.9) { | |
| try { | |
| const context = new window.AudioContext() | |
| const oscil = context.createOscillator(); | |
| const gain = context.createGain(); | |
| gain.gain.value = 0.00001; | |
| oscil.type = type; | |
| oscil.connect(gain); | |
| oscil.frequency.value = frequency; | |
| gain.connect(context.destination); | |
| oscil.start(0); | |
| gain.gain.exponentialRampToValueAtTime(maxGain, context.currentTime + 0.2); | |
| gain.gain.exponentialRampToValueAtTime(0.00001, context.currentTime + 1); | |
| window.setTimeout(function() { | |
| oscil.stop(); | |
| context.close(); | |
| }, 1000); | |
| return { | |
| gain, context, oscil | |
| }; | |
| } | |
| catch(e) { | |
| console.log(e); | |
| } | |
| }; | |
| const success = function success() { | |
| play(523.3, 'sine'); | |
| play(329.6, 'sine'); | |
| play(392.0, 'sine'); | |
| }; | |
| const attention = function attention() { | |
| play(196.0, 'sine', 0.6); | |
| play(392.0, 'sine', 0.6); | |
| play(523.3, 'sine', 0.6) | |
| }; | |
| const sad = function sad() { | |
| setTimeout(function() { | |
| play(58.27, 'triangle'); | |
| play(110.00, 'sine', 0.75); | |
| }, 150); | |
| play(220.00, 'triangle'); | |
| play(220.00, 'sine', 0.6); | |
| }; | |
| window.feedbackAudio = { | |
| success, attention, sad | |
| }; | |
| window.addEventListener('load', audioInit, false); | |
| })(); |
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