edlp_d8/libraries/wavesurfer

wavesurfer.js

Read below how to update to version 2!

Interactive navigable audio visualization using Web Audio and Canvas.

See a tutorial and examples on wavesurfer-js.org.

Browser support

wavesurfer.js works only in modern browsers supporting Web Audio.

It will fallback to Audio Element in other browsers (without graphics). You can also try wavesurfer.swf which is a Flash-based fallback.

FAQ

Can the audio start playing before the waveform is drawn?

Yes, if you use the backend: 'MediaElement' option. See here: https://wavesurfer-js.org/example/audio-element/. The audio will start playing as you press play. A thin line will be displayed until the whole audio file is downloaded and decoded to draw the waveform.

Can drawing be done as file loads?

No. Web Audio needs the whole file to decode it in the browser. You can however load pre-decoded waveform data to draw the waveform immediately. See here: https://wavesurfer-js.org/example/audio-element/ (the "Pre-recoded Peaks" section).

API in examples

Choose a container:

<div id="waveform"></div>

Create an instance, passing the container selector and options:

var wavesurfer = WaveSurfer.create({
    container: '#waveform',
    waveColor: 'violet',
    progressColor: 'purple'
});

Subscribe to some events:

wavesurfer.on('ready', function () {
    wavesurfer.play();
});

Load an audio file from a URL:

wavesurfer.load('example/media/demo.wav');

Documentation

See the documentation on all available methods, options and events on the homepage.

Note on version 2: The wavesurfer.js core library and the plugins were refactored to be modular so it can be used with a module bundler. (You can still use wavesurfer without, e.g. with <script> tags) The code was also updated to ES6/ES7 syntax and is transpiled with babel and webpack. Read below how to update your code.

Upgrading to version 2

The API has mostly stayed the same but there are some changes to consider:

1. MultiCanvas renderer is now the default: It provides all functionality of the Canvas renderer. – Most likely you can simply remove the renderer option – The Canvas renderer has been removed. (The renderer option still exists but wavesurfer expects it to be a renderer object, not merely a string.)

2. Constructor functions instead of object constructors

// Old:
var wavesurfer = Object.create(WaveSurfer);
Wavesurfer.init(options);

// New:
var wavesurfer = WaveSurfer.create(options);
// ... or
var wavesurfer = new WaveSurfer(options);
wavesurfer.init();

1. New plugin API: Previously all plugins had their own initialisation API. The new API replaces all these different ways to do the same thing with one plugin API built into the core library. Plugins are now added as a property of the wavesurfer configuration object during creation. You don't need to initialise the plugins yourself anymore. Below is an example of initialising wavesurfer with plugins (Note the different ways to import the library at the top):

// EITHER - accessing modules with <script> tags
var WaveSurfer = window.WaveSurfer;
var TimelinePlugin = window.WaveSurfer.timeline;
var MinimapPlugin = window.WaveSurfer.minimap;

// OR - importing as es6 module
import WaveSurfer from 'wavesurfer.js';
import TimelinePlugin from 'wavesurfer.js/dist/plugin/wavesurfer.timeline.min.js';
import MinimapPlugin from 'wavesurfer.js/dist/plugin/wavesurfer.minimap.min.js';

// OR - importing as require.js/commonjs modules
var WaveSurfer = require('wavesurfer.js');
var TimelinePlugin = require('wavesurfer.js/dist/plugin/wavesurfer.timeline.min.js');
var MinimapPlugin = require('wavesurfer.js/dist/plugin/wavesurfer.minimap.min.js');

// ... initialising waveform with plugins
var wavesurfer = WaveSurfer.create({
    container: '#waveform',
    waveColor: 'violet',
    plugins: [
        TimelinePlugin.create({
            container: '#wave-timeline'
        }),
        MinimapPlugin.create()
    ]
});

Note: Read more about the plugin API in the documentation.

Using with a module bundler

Wavesurfer can be used with a module system like this:

// import
import WaveSurfer from 'wavesurfer.js';

// commonjs/requirejs
var WaveSurfer = require('wavesurfer.js');

// amd
define(['WaveSurfer'], function(WaveSurfer) {
  // ... code
});

Related projects

For a list of projects using wavesurfer.js, check out the projects page.

Development

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Install development dependencies:

npm install

Development tasks automatically rebuild certain parts of the library when files are changed (start – wavesurfer, start:plugins – plugins). Start a dev task and go to localhost:8080/example/ to test the current build.

Start development server for core library:

npm run start

Start development server for plugins:

npm run start:plugins

Build all the files. (generated files are placed in the dist directory.)

npm run build

Running tests only:

npm run test

Build documentation with esdoc (generated files are placed in the doc directory.)

npm run doc

Editing documentation

The homepage and documentation files are maintained in the gh-pages branch. Contributions to the documentation are especially welcome.

Credits

Initial idea by Alex Khokhulin. Many thanks to the awesome contributors!

License

This work is licensed under a BSD 3-Clause License.