Add volumemeter example

.eslintrc.js

@@ -1,5 +1,4 @@
 module.exports = {
-  root: true,
   parser: 'babel-eslint',
   extends: [
     'airbnb-base',

CHANGELOG.md

@@ -12,6 +12,8 @@ and this project adheres to [Semantic Versioning](http://semver.org).
 - `recorder`
   - Made it possible to load plugins.
   - Added the Amplitude plugin.
+- `examples`
+  - Add an example project to demonstrate the `AmplitudePlugin`.
 
 ### Changed
 
@@ -104,8 +106,7 @@ and this project adheres to [Semantic Versioning](http://semver.org).
 - Improve README.md documentation.
 - Changed the getUserAuth and getOAuth2Token to use the new API auth functions.
 
-
-[Unreleased]: https://github.com/itslanguage/itslanguage-js/compare/v4.1.0...HEAD
+[unreleased]: https://github.com/itslanguage/itslanguage-js/compare/v4.1.0...HEAD
 [v4.1.0]: https://github.com/itslanguage/itslanguage-js/compare/v4.0.2...v4.1.0
 [v4.0.2]: https://github.com/itslanguage/itslanguage-js/compare/v4.0.1...v4.0.2
 [v4.0.1]: https://github.com/itslanguage/itslanguage-js/compare/v4.0.0...v4.0.1

examples/react-recorder-volume-indicator/.babelrc

@@ -0,0 +1,20 @@
+{
+  "presets": [
+    [
+      "@babel/preset-env",
+      {
+        "spec": false,
+        "loose": true,
+        "useBuiltIns": "usage",
+        "corejs": 3
+      }
+    ],
+    ["@babel/preset-react", { "useBuiltIns": true }]
+  ],
+
+  "plugins": [
+    "@babel/plugin-syntax-dynamic-import",
+    ["@babel/plugin-proposal-class-properties", { "loose": true }],
+    ["@babel/plugin-transform-runtime", { "helpers": true }]
+  ]
+}

examples/react-recorder-volume-indicator/.eslintignore

@@ -0,0 +1,3 @@
+!.*
+build/
+node_modules/

examples/react-recorder-volume-indicator/.eslintrc.js

@@ -0,0 +1,23 @@
+module.exports = {
+  parser: 'babel-eslint',
+  extends: ['airbnb', 'plugin:prettier/recommended', 'prettier/react'],
+  plugins: ['react', 'react-hooks', 'jsx-a11y'],
+  env: {
+    jest: true,
+    browser: true,
+    node: true,
+    es6: true,
+  },
+  rules: {
+    'import/no-extraneous-dependencies': 0,
+    'react/jsx-filename-extension': 0,
+    'react/prefer-stateless-function': 0,
+  },
+  settings: {
+    'import/resolver': {
+      webpack: {
+        config: './webpack.config.js',
+      },
+    },
+  },
+};

examples/react-recorder-volume-indicator/.prettierignore

@@ -0,0 +1,5 @@
+build/
+node_modules/
+package-lock.json
+yarn.lock
+package.json

examples/react-recorder-volume-indicator/.prettierrc.json

@@ -0,0 +1,5 @@
+{
+  "semi": true,
+  "singleQuote": true,
+  "trailingComma": "all"
+}

examples/react-recorder-volume-indicator/README.md

@@ -0,0 +1,12 @@
+# Recorder volume indicator
+
+Example project to show how to create volume indication on the `@itslanguage/recorder` package.
+
+## Getting started, TL;DR
+
+1. Clone the [itslanguage sdk](https://github.com/itslanguage/itslanguage-js.git) repository;
+1. Navigate to the specific example in the examples directory;
+1. Run `npm install` or `yarn install`;
+1. Run `npm run start` or `yarn run start`;
+
+The example should now be available via [http://localhost:3000](http://localhost:3000).

examples/react-recorder-volume-indicator/app/components/AmplitudeMeter/index.css

@@ -0,0 +1,16 @@
+.AmplitudeMeter {
+  margin: 2rem;
+}
+
+.AmplitudeMeter:hover circle:last-child {
+  fill: #eeeeee;
+}
+
+.AmplitudeMeter circle {
+  user-select: none;
+  transition: all 0.1s;
+}
+
+.AmplitudeMeter text {
+  user-select: none;
+}

examples/react-recorder-volume-indicator/app/components/AmplitudeMeter/index.jsx

@@ -0,0 +1,100 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import {
+  createMediaStream,
+  createRecorder,
+  createAmplitudePlugin,
+} from '../../../../../packages/recorder';
+import './index.css';
+
+class AmplitudeMeter extends React.Component {
+  state = {
+    currentVolume: 0,
+  };
+
+  componentWillMount() {
+    this.initializeRecorder();
+  }
+
+  componentWillUpdate(nextProps) {
+    const { enableMeter } = this.props;
+    if (nextProps.enableMeter !== enableMeter) {
+      if (nextProps.enableMeter) {
+        this.start();
+      } else {
+        this.stop();
+      }
+    }
+  }
+
+  componentWillUnmount() {
+    this.recorder.removeEventListener('amplitudelevels', this.updateVolume);
+  }
+
+  start = () => {
+    this.recorder.start();
+  };
+
+  stop = () => {
+    this.setState({ currentVolume: 0 }, () => {
+      this.recorder.stop();
+    });
+  };
+
+  updateVolume = ({ data }) => {
+    this.setState({ currentVolume: data.volume });
+  };
+
+  initializeRecorder = async () => {
+    const stream = await createMediaStream();
+    const recorderPlugins = [createAmplitudePlugin()];
+
+    this.recorder = createRecorder(stream, recorderPlugins);
+    this.recorder.addEventListener('amplitudelevels', this.updateVolume);
+  };
+
+  render() {
+    const { currentVolume } = this.state;
+    const volume = Math.min(
+      Math.max(parseInt(currentVolume * 30 * 64, 10), 16),
+      256,
+    );
+    const currentVolumeRounded = parseFloat(
+      Math.round(currentVolume * 100) / 100,
+      10,
+    ).toFixed(2);
+
+    return (
+      <svg
+        className="AmplitudeMeter"
+        width="64px"
+        height="64px"
+        viewBox="0 0 536 716"
+      >
+        <circle cx="256" cy="256" r="256" fill="#dadada" />
+        <circle cx="256" cy="256" r={volume} fill="#e9573e" />
+        <text
+          x="50%"
+          y="100%"
+          textAnchor="middle"
+          stroke="#000000"
+          strokeWidth="2px"
+          fontSize="120px"
+          fontFamily="Fira Mono"
+        >
+          {currentVolumeRounded}
+        </text>
+      </svg>
+    );
+  }
+}
+
+AmplitudeMeter.propTypes = {
+  enableMeter: PropTypes.bool,
+};
+
+AmplitudeMeter.defaultProps = {
+  enableMeter: false,
+};
+
+export default AmplitudeMeter;

examples/react-recorder-volume-indicator/app/components/App/index.css

@@ -0,0 +1,14 @@
+.App {
+  margin: 0 auto;
+  max-width: 960px;
+}
+
+.App .center {
+  text-align: center;
+}
+
+@media screen and (max-width: 976px) {
+  .App {
+    padding: 1rem;
+  }
+}

examples/react-recorder-volume-indicator/app/components/App/index.jsx

@@ -0,0 +1,67 @@
+import React from 'react';
+import AmplitudeMeter from '../AmplitudeMeter';
+import Button from '../Button';
+
+import './index.css';
+
+class App extends React.Component {
+  state = {
+    enableMeter: false,
+  };
+
+  toggleMeter = () => {
+    this.setState(prevState => ({
+      enableMeter: !prevState.enableMeter,
+    }));
+  };
+
+  render() {
+    const { enableMeter } = this.state;
+    return (
+      <div className="App">
+        <div>
+          <h2>Volume indication example</h2>
+          <p>
+            Live demonstration of a recorder with <code>AmplitudePlugin</code>{' '}
+            enabled. If the <code>AmplitudePlugin</code> is enabled on the
+            recorder, the recorder will regulary emit an{' '}
+            <code>amplitude-level</code> event that has the current amplitude
+            level information. We can use that value to animate the circle.
+            Click on the "Enable meter" button to enable the recorder and show
+            the volume meter received from the recorder.
+          </p>
+        </div>
+        <div className="center">
+          <AmplitudeMeter enableMeter={enableMeter} />
+          <br />
+          <Button onClick={this.toggleMeter}>
+            {enableMeter ? 'Disable' : 'Enable'} meter
+          </Button>
+        </div>
+        <div>
+          <h3>About volume</h3>
+          <p>
+            The volume object that gets emitted by the recorder looks like
+            below.
+          </p>
+          <pre>
+            <code>
+              {`{
+  "averageVolumePerChannel": [0, 0],
+  "volumePerChannel": [0.12, 0.10],
+  "volume": 0.11
+}`}
+            </code>
+          </pre>
+          <p>
+            This example output uses a recorder with 2 output channels (i.e.
+            stereo). The volume will always be a positive number between 0.0 and
+            1.0
+          </p>
+        </div>
+      </div>
+    );
+  }
+}
+
+export default App;

examples/react-recorder-volume-indicator/app/components/Button/index.css

@@ -0,0 +1,21 @@
+.Button {
+  background-color: #dadada;
+  border: none;
+  border-bottom: 2px solid #2d3a48;
+  border-right: 2px solid #2d3a48;
+  border-radius: 8px;
+  cursor: pointer;
+  padding: 0.5rem 1rem ;
+}
+
+.Button:hover {
+  background: #2d5b71;
+}
+
+.Button:focus {
+  outline: none;
+}
+
+.Button:active {
+  transform: scale(0.99);
+}

examples/react-recorder-volume-indicator/app/components/Button/index.jsx

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+import React from 'react';
+import PropTypes from 'prop-types';
+import './index.css';
+
+const Button = ({ children, onClick }) => (
+  <button type="button" onClick={onClick} className="Button">
+    {children}
+  </button>
+);
+
+Button.propTypes = {
+  children: PropTypes.node.isRequired,
+  onClick: PropTypes.func.isRequired,
+};
+
+export default Button;

examples/react-recorder-volume-indicator/app/index.css

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+body {
+  background-color: #2db7dd;
+  color: #202020;
+  font-family: 'Fira Sans', sans-serif;
+  line-height: 1.4;
+  font-size: 16px;
+  font-weight: 300;
+  margin: 0;
+  padding: 0;
+}
+
+code {
+  background-color: #6ccde7;
+  color: #9b3a27;
+  font-family: 'Fira Mono', monospace;
+  font-weight: 400;
+  padding: 0 0.3rem;
+}
+
+pre {
+  background-color: #6ccde7;
+  padding: 1rem;
+  width: 100%;
+}
+
+p {
+  margin-top: 0;
+}

examples/react-recorder-volume-indicator/app/index.jsx

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+import React from 'react';
+import ReactDOM from 'react-dom';
+import 'sanitize.css';
+import './index.css';
+import App from './components/App';
+
+ReactDOM.render(<App />, document.getElementById('root'));

examples/react-recorder-volume-indicator/app/public/index.html

@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <link rel="shortcut icon" href="favicon.ico" />
+    <meta
+      name="viewport"
+      content="width=device-width, initial-scale=1, shrink-to-fit=no"
+    />
+    <title>React Volume Indicator App</title>
+
+    <link
+      href="https://fonts.googleapis.com/css?family=Fira+Mono:400|Fira+Sans:300,300i,500,500i,700,700i"
+      rel="stylesheet"
+    />
+  </head>
+  <body>
+    <noscript>You need to enable JavaScript to run this app.</noscript>
+    <div id="root"></div>
+    <script src="../dist/bundle.js"></script>
+  </body>
+</html>