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web-audio-canvas
Commit b48a8a31 by Ashiqur Rahman
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micro input stream on canvas

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Showing with 385 additions and 0 deletions
.gitignore 0 → 100644
# See https://help.github.com/ignore-files/ for more about ignoring files.
# dependencies
/node_modules
# testing
/coverage
# production
/build
# misc
.DS_Store
.env.local
.env.development.local
.env.test.local
.env.production.local
npm-debug.log*
yarn-debug.log*
yarn-error.log*
LICENSE 0 → 100644
Copyright 2018 Phil Nash
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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package-lock.json 0 → 100644
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package.json 0 → 100644
{
"name": "react-web-audio",
"version": "0.1.0",
"private": true,
"dependencies": {
"react": "^16.4.2",
"react-dom": "^16.4.2",
"react-scripts": "1.1.5"
},
"scripts": {
"start": "react-scripts start",
"build": "react-scripts build",
"test": "react-scripts test --env=jsdom",
"eject": "react-scripts eject"
}
}
public/index.html 0 → 100644
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<meta name="theme-color" content="#000000">
<!--
manifest.json provides metadata used when your web app is added to the
homescreen on Android. See https://developers.google.com/web/fundamentals/engage-and-retain/web-app-manifest/
-->
<link rel="manifest" href="%PUBLIC_URL%/manifest.json">
<link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico">
<!--
Notice the use of %PUBLIC_URL% in the tags above.
It will be replaced with the URL of the `public` folder during the build.
Only files inside the `public` folder can be referenced from the HTML.
Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
work correctly both with client-side routing and a non-root public URL.
Learn how to configure a non-root public URL by running `npm run build`.
-->
<title>Web Audio</title>
</head>
<body>
<noscript>
You need to enable JavaScript to run this app.
</noscript>
<main id="root"></main>
</body>
</html>
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public/manifest.json 0 → 100644
{
"short_name": "React App",
"name": "Create React App Sample",
"icons": [
{
"src": "favicon.ico",
"sizes": "64x64 32x32 24x24 16x16",
"type": "image/x-icon"
}
],
"start_url": "./index.html",
"display": "standalone",
"theme_color": "#000000",
"background_color": "#ffffff"
}
src/App.js 0 → 100644
import React, { Component } from 'react';
import AudioAnalyser from './AudioAnalyser';
class App extends Component {
constructor(props) {
super(props);
this.state = {
audio: null
};
this.toggleMicrophone = this.toggleMicrophone.bind(this);
}
async getMicrophone() {
const audio = await navigator.mediaDevices.getUserMedia({
audio: true,
video: false
});
this.setState({ audio });
}
stopMicrophone() {
this.state.audio.getTracks().forEach(track => track.stop());
this.setState({ audio: null });
}
toggleMicrophone() {
if (this.state.audio) {
this.stopMicrophone();
} else {
this.getMicrophone();
}
}
render() {
return (
<div className="App">
<div className="controls">
<button onClick={this.toggleMicrophone}>
{this.state.audio ? 'Stop microphone' : 'Get microphone input'}
</button>
</div>
{this.state.audio ? <AudioAnalyser audio={this.state.audio} /> : ''}
</div>
);
}
}
export default App;
src/App.test.js 0 → 100644
import React from 'react';
import ReactDOM from 'react-dom';
import App from './App';
it('renders without crashing', () => {
const div = document.createElement('div');
ReactDOM.render(<App />, div);
ReactDOM.unmountComponentAtNode(div);
});
src/AudioAnalyser.js 0 → 100644
import React, { Component } from 'react';
import AudioVisualiser from './AudioVisualiser';
class AudioAnalyser extends Component {
constructor(props) {
super(props);
this.state = { audioData: new Uint8Array(0) };
this.tick = this.tick.bind(this);
}
componentDidMount() {
this.audioContext = new (window.AudioContext ||
window.webkitAudioContext)();
this.analyser = this.audioContext.createAnalyser();
this.dataArray = new Uint8Array(this.analyser.frequencyBinCount);
this.source = this.audioContext.createMediaStreamSource(this.props.audio);
this.source.connect(this.analyser);
this.rafId = requestAnimationFrame(this.tick);
}
tick() {
this.analyser.getByteTimeDomainData(this.dataArray);
this.setState({ audioData: this.dataArray });
this.rafId = requestAnimationFrame(this.tick);
}
componentWillUnmount() {
cancelAnimationFrame(this.rafId);
this.analyser.disconnect();
this.source.disconnect();
}
render() {
return <AudioVisualiser audioData={this.state.audioData} />;
}
}
export default AudioAnalyser;
src/AudioVisualiser.js 0 → 100644
import React, { Component } from 'react';
class AudioVisualiser extends Component {
constructor(props) {
super(props);
this.canvas = React.createRef();
}
componentDidUpdate() {
this.draw();
}
draw() {
const { audioData } = this.props;
const canvas = this.canvas.current;
const height = canvas.height;
const width = canvas.width;
const context = canvas.getContext('2d');
let x = 0;
const sliceWidth = (width * 1.0) / audioData.length;
context.lineWidth = 2;
context.strokeStyle = '#000000';
context.clearRect(0, 0, width, height);
context.beginPath();
context.moveTo(0, height / 2);
for (const item of audioData) {
const y = (item / 255.0) * height;
context.lineTo(x, y);
x += sliceWidth;
}
context.lineTo(x, height / 2);
context.stroke();
}
render() {
return <canvas width="300" height="300" ref={this.canvas} />;
}
}
export default AudioVisualiser;
src/index.css 0 → 100644
body {
margin: 0;
padding: 0;
font-family: Helvetica, Arial, sans-serif;
display: grid;
}
a {
color: #fff;
}
main {
min-height: 80vh;
background: #fff;
}
main .controls {
text-align: center;
padding: 0.5em 0;
color: #fff;
}
main canvas {
padding: 20px;
margin: 0 auto;
display: block;
}
src/index.js 0 → 100644
import React from 'react';
import ReactDOM from 'react-dom';
import './index.css';
import App from './App';
import registerServiceWorker from './registerServiceWorker';
ReactDOM.render(<App />, document.getElementById('root'));
registerServiceWorker();
src/registerServiceWorker.js 0 → 100644
// In production, we register a service worker to serve assets from local cache.
// This lets the app load faster on subsequent visits in production, and gives
// it offline capabilities. However, it also means that developers (and users)
// will only see deployed updates on the "N+1" visit to a page, since previously
// cached resources are updated in the background.
// To learn more about the benefits of this model, read https://goo.gl/KwvDNy.
// This link also includes instructions on opting out of this behavior.
const isLocalhost = Boolean(
window.location.hostname === 'localhost' ||
// [::1] is the IPv6 localhost address.
window.location.hostname === '[::1]' ||
// 127.0.0.1/8 is considered localhost for IPv4.
window.location.hostname.match(
/^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/
)
);
export default function register() {
if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {
// The URL constructor is available in all browsers that support SW.
const publicUrl = new URL(process.env.PUBLIC_URL, window.location);
if (publicUrl.origin !== window.location.origin) {
// Our service worker won't work if PUBLIC_URL is on a different origin
// from what our page is served on. This might happen if a CDN is used to
// serve assets; see https://github.com/facebookincubator/create-react-app/issues/2374
return;
}
window.addEventListener('load', () => {
const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`;
if (isLocalhost) {
// This is running on localhost. Lets check if a service worker still exists or not.
checkValidServiceWorker(swUrl);
// Add some additional logging to localhost, pointing developers to the
// service worker/PWA documentation.
navigator.serviceWorker.ready.then(() => {
console.log(
'This web app is being served cache-first by a service ' +
'worker. To learn more, visit https://goo.gl/SC7cgQ'
);
});
} else {
// Is not local host. Just register service worker
registerValidSW(swUrl);
}
});
}
}
function registerValidSW(swUrl) {
navigator.serviceWorker
.register(swUrl)
.then(registration => {
registration.onupdatefound = () => {
const installingWorker = registration.installing;
installingWorker.onstatechange = () => {
if (installingWorker.state === 'installed') {
if (navigator.serviceWorker.controller) {
// At this point, the old content will have been purged and
// the fresh content will have been added to the cache.
// It's the perfect time to display a "New content is
// available; please refresh." message in your web app.
console.log('New content is available; please refresh.');
} else {
// At this point, everything has been precached.
// It's the perfect time to display a
// "Content is cached for offline use." message.
console.log('Content is cached for offline use.');
}
}
};
};
})
.catch(error => {
console.error('Error during service worker registration:', error);
});
}
function checkValidServiceWorker(swUrl) {
// Check if the service worker can be found. If it can't reload the page.
fetch(swUrl)
.then(response => {
// Ensure service worker exists, and that we really are getting a JS file.
if (
response.status === 404 ||
response.headers.get('content-type').indexOf('javascript') === -1
) {
// No service worker found. Probably a different app. Reload the page.
navigator.serviceWorker.ready.then(registration => {
registration.unregister().then(() => {
window.location.reload();
});
});
} else {
// Service worker found. Proceed as normal.
registerValidSW(swUrl);
}
})
.catch(() => {
console.log(
'No internet connection found. App is running in offline mode.'
);
});
}
export function unregister() {
if ('serviceWorker' in navigator) {
navigator.serviceWorker.ready.then(registration => {
registration.unregister();
});
}
}
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