window.onload = function() { var ctx = new AudioContext(); var audio = document.getElementById(‘myAudio’); var audioSrc = ctx.createMediaElementSource(audio); var analyser = ctx.createAnalyser(); // we have to connect the MediaElementSource with the analyser audioSrc.connect(analyser); // we could configure the analyser: e.g. analyser.fftSize (for further infos read the spec) // frequencyBinCount tells you how many values you’ll receive …
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