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Function that can be used to amplify the volume of a media element (<audio> or <video>).
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| function amplifyMedia(mediaElem, multiplier) { | |
| var context = new (window.AudioContext || window.webkitAudioContext), | |
| result = { | |
| context: context, | |
| source: context.createMediaElementSource(mediaElem), | |
| gain: context.createGain(), | |
| media: mediaElem, | |
| amplify: function(multiplier) { result.gain.gain.value = multiplier; }, | |
| getAmpLevel: function() { return result.gain.gain.value; } | |
| }; | |
| result.source.connect(result.gain); | |
| result.gain.connect(context.destination); | |
| result.amplify(multiplier); | |
| return result; | |
| } |
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| <!doctype html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>My Test Video</title> | |
| </head> | |
| <body> | |
| <video id="myVideo" controls src="video.mp4"></video> | |
| <script src="createAmplifier.js"></script> | |
| <script type="text/JavaScript"> | |
| // Make my video twice as loud as normal. | |
| createAmplifier(document.getElementById('myVideo'), 2); | |
| </script> | |
| </body> | |
| </html> |
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