Canvas-app-recorder

Module to record HTML Canvas and WebAudio based App.
Make sure this module is experimental, and could be drastically changed.

Prerequisites

• Browser should support captureStream/MediaStream and MediaRecorder API.
• Your canvas should not be tainted. (Don't use data loaded from another origin without CORS approval!)

Install and Usage

in-browser

<script src='path/to/canvas-app-recorder.js'></script>

// Instance of your app
const app = new YourCoolApp();
 
const canvasRecorder = new CanvasAppRecorder(
  app.getCanvasElement(), // the canvas element used in your app
  app.getAudioContext(), // the webAudio context used in your app
  app.getMasterGain() // the webAudio gainNode
  // ,anotherGain // you can add more than one gain node
);
 
// open dialog after recording to save the result video
canvasRecorder.downloadAfterStop = true;
 
// callback function after stopping
canvasRecorder.onstop = (data)=> {
  const videoElement = document.createElement('video');
  document.body.appendChild(videoElement);
  videoElement.loop = true;
  videoElement.src = window.URL.createObjectURL(data.blob);
  videoElement.play();
}
 
// start recording
app.start();
canvasRecorder.start();
 
// stop recording in some timing
setTimeout(()=> {
  canvasRecorder.stop();
}, 5000);

ES Modules

npm install canvas-app-recorder

import CanvasAppRecorder from "canvas-app-recorder";
 
/* ... same as example above */
 

CDN

https://cdn.jsdelivr.net/npm/canvas-app-recorder@0.1.0/dist/canvas-app-recorder.min.js

License

MIT