Created
February 2, 2012 05:39
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Web Audio API and Dart
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| #import('dart:dom', prefix:'dom'); | |
| #import('dart:html'); | |
| main() { | |
| dom.AudioContext audioContext = new dom.AudioContext(); | |
| dom.AudioBufferSourceNode source = audioContext.createBufferSource(); | |
| dom.AudioGainNode gainNode = audioContext.createGainNode(); | |
| source.connect(gainNode, 0, 0); | |
| gainNode.connect(audioContext.destination, 0, 0); | |
| dom.XMLHttpRequest xhr = new dom.XMLHttpRequest(); | |
| xhr.open("GET", "techno.mp3", true); | |
| xhr.responseType = "arraybuffer"; | |
| xhr.addEventListener('load', (e) { | |
| // asynchronous decoding | |
| audioContext.decodeAudioData(xhr.response, function(buffer) { | |
| source.buffer = buffer; | |
| var button = document.query("#play"); | |
| button.disabled = false; | |
| button.on.click.add((e) { | |
| source.noteOn(0); | |
| }); | |
| }, function() { | |
| print('Error decoding MP3 file'); | |
| }); | |
| }); | |
| xhr.send(); | |
| document.query("#volume").on.change.add((e) { | |
| var volume = Math.parseInt(e.target.value); | |
| var max = Math.parseInt(e.target.max); | |
| var fraction = volume / max; | |
| gainNode.gain.value = fraction * fraction; | |
| }); | |
| } |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>Hello World</title> | |
| </head> | |
| <body> | |
| <h1>Hello World!</h1> | |
| <button id="play" disabled>Play</button> | |
| <label for="volume">Volume: <input type="range" min="0" max="100" id="volume" value="100"></label> | |
| <script type="text/javascript" src="app.dart.js"></script> | |
| </body> | |
| </html> |
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