🎧 audio-visualization-toolkit

Lightweight and customizable audio visualization toolkit build up on web audio api.

A thin wrapper of Audio Element and Web Audio API.

It currently uses canvas2D as the graphic engine, I will implement the ability to use Three.js later.

Demo: https://eggtronic.github.io/web-audio-visualization-tool/

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✨ Features

• 🌈 Customizable - provides lifecycle hooks for audio visualization and interaction.
• 🛡 Modularity - use imagination to create your own audio visualization or audio player.
• 📦 Lightweight - only few lines of code.
• 🎨 Ready to go - there are some ready to use hooks implemented for you.

✨ Useful Libraries

• 🌈 web-audio-beat-detector - use it to detect BPM of the audio

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🖥 Environment Support

• Currently only support the latest browsers such as Chrome, but will implement the support for more browers in the future.

Firefox	Chrome
latest versions	latest versions

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🔨 Development

1. Run npm install
2. Run npm run build to build
3. Run npm run dev for development

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✨ Basic Usage

1. You can install it from npm (unstable)

   `npm install --save audio-visualization-tool`
   

   You can also get it from cdn in script tag

   <script src='https://cdn.jsdelivr.net/npm/audio-visualization-tool@0.0.1/lib/index.js'></script>
   

2. In your html body you need create 2 canvas element and 1 audio element.

    <audio id="myAudio" src="..." data-author="..." data-title="..."></audio>
    <canvas id="myCanvas" width="800" height="400"></canvas>
    <canvas id="myStaticCanvas" width="800" height="400"></canvas>

    <script src='https://cdn.jsdelivr.net/npm/audio-visualization-tool@0.0.2/lib/index.js'></script>
    <script type="module" src='example.js'></script>

2. Create an example.js file and copy the js code below into it. (you can also use your own name)
3. You will need to reference 2 canvas element id and 1 audio element id to init the AudioVisualizer.
4. (optional) You can reference your own canvases.
5. You can reuse my example style for a better preview (it's in the index.html)

window.addEventListener('DOMContentLoaded', () => {
  'use strict';
  
  const AudioVisualizer = AudioVisualizeTool.AudioVisualizer;

  const {
    Ripple
  } = AudioVisualizeTool.defaultElements;

  const {
    renderTime,
    renderInfo,
    renderLoading,
    clearLoading,
    renderBackgroundImg,
    renderLounge,
    renderProgressbar,
    renderProgressbarShadow,
    renderSeekBar,
    renderSeekBarShadow,
    bindSeekBarEvent,
    renderPlayControl,
    bindPlayControlEvent,
    renderVolumeBar,
    bindVolumeBarEvent
  } = AudioVisualizeTool.defaultRenderHooks;

  const {
    setCanvasStyle,
    setStaticCanvasStyle
  } = AudioVisualizeTool.defaultInitHooks;

  let ripple = new Ripple();
  let audioVisualizer = new AudioVisualizer({
    autoplay: false,
    loop: true,
    initVolume: 0.5, // 0 to 1;
    fftSize: 512, // the frequency sample size for audio analyzer
    framesPerSecond: 60, // the refresh rate for rendering canvas (not static canvas)

    audio: 'myAudio',
    audioURLs: ['./static/reverie.mp3'], // these urls are for tempo(NPM) detection only

    canvas: 'myCanvas', // main canvas for rendering frames
    canvasStatic: 'myStaticCanvas', // static canvas
    customCanvases: [], // you can add your own canvases

    // customize your theme
    theme: {
      barWidth: 2,
      barHeight: 5,
      barSpacing: 7,
      barColor: '#ffffff',
      shadowBlur: 20, // avoid this attribute for rendering frames, it can reduce the performance
      shadowColor: '#ffffff',
      font: ['12px', 'Helvetica'],
    },

    // hooks contain callbacks just before/after differency lifecycle stage
    // cb in before hooks should return promises
    beforeInitHook: [],
    afterInitHook: [setCanvasStyle, setStaticCanvasStyle],

    beforeLoadAudioHook: [renderLoading],
    afterLoadAudioHook: [clearLoading, renderPlayControl],

    beforeStartHook: [],
    afterStartHook: [],

    beforePauseHook: [],
    afterPauseHook: [renderProgressbar, renderTime, renderSeekBar, renderPlayControl],

    beforeResumeHook: [],
    afterResumeHook: [],

    // you can react to volume change here
    onVolumeChangeHook: [renderVolumeBar],

    // hook for static canvas
    beforeStaticHook: [renderBackgroundImg],
    onStaticHook: [renderProgressbarShadow, renderInfo, renderSeekBarShadow, renderVolumeBar],

    // hooks that will be excuted for each frame
    // used for the main canvas
    onFrameHook: [renderLounge, renderProgressbar, renderTime, renderSeekBar, ripple.render()],

    // you may bind your events here
    onEventHook: [bindPlayControlEvent, bindSeekBarEvent, bindVolumeBarEvent],

    // you may release some resourse here 
    // if loop is ture this hook will not be excuted
    onEndHook: [],
  })
  audioVisualizer.init();
}, false);

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🔨 Create Your Own Audio Visualization

editing...

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🤝 Contributing

I haven't specified an contributing guide, but I welcome all contributions. If you have any questions or ideas just email me.

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📝 Here is my todo list (** means on going)

• ** NPM upload + cdn
• ** multiple audio source support
• ** Refactor to TypeScript
• ** design object modal for elements on canvas
  • an example of ripple class
  • create super class for dynamic elements
  • create super class for static elements
  • interface for handling mouse events
  • interface for handling key events
• ** hover event cursor management
• ** size - autofit container
• using rollup to pack the tool
• audio load on fly support
• add another layer of canvas for rendering static elements
• class implementation
• include canvas2d as render engine
• split the lifecycle into serveral stages
• Hooks for lifecycle stages:
  • init stage
  • on start stage
  • on pause stage
  • on resume stage
  • on end stage
  • on volume change
  • render frame stage
  • add async loader for static rendering
• add some ready to use renderers (hooks)
  • rounded frequency visualization
  • time visualization
  • progress visualization
    • draggable seeking bar
  • background_image
  • volume control
  • start/pause control
  • next/previous song button
• Compatibility across different browsers
• adding ability to support Three.js
• typescript support