Web Audio to visualize and interact with waveforms

Question

How do I write a JavaScript program to display a waveform from an audio file? I want to use Web Audio and Canvas.

I tried this code:

(new window.AudioContext).decodeAudioData(audioFile, function (data) {    var channel = data.getChannelData(0);    for (var i = 0; i < channel; i++) {        canvas.getContext('2d').fillRect(i, 1, 40 - channel[i], 40);    } }); 

But the result is far from what I want (namely, the image is not smooth since I'm drawing with rectangles). I want it to look smooth like this image:

Any hints on how to implement the waveform?

Answer 1

Rolled out my own library after all: wavesurfer.js.

It draws a waveform from PCM data and seeks regions of the audio by clicking on it.

Answer 2

You may be interested in AudioJedit. This is an open source project hosted at GitHub. It have small server-side node.js script for loading audio files, but all interaction with audio implemented in client-side JavaScript. I think this is similar to what you are looking for.