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🎤 How to record audio using the MediaStream Recording API in JavaScript
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| <!DOCTYPE html> | |
| <html lang="ja"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> | |
| <title>How to record audio using the MediaStream Recording API in JavaScript</title> | |
| </head> | |
| <body> | |
| <h1>How to record audio using the MediaStream Recording API in JavaScript</h1> | |
| <div> | |
| <button type="button" id="buttonStart">Start</button> | |
| <button type="button" id="buttonStop" disabled>Stop</button> | |
| </div> | |
| <div> | |
| <audio controls id="player"></audio> | |
| </div> | |
| <script src="main.js"></script> | |
| </body> | |
| </html> |
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| main() | |
| async function main () { | |
| const buttonStart = document.querySelector('#buttonStart') | |
| const buttonStop = document.querySelector('#buttonStop') | |
| const player = document.querySelector('#player') | |
| const stream = await navigator.mediaDevices.getUserMedia({ // <1> | |
| video: false, | |
| audio: true, | |
| }) | |
| if (!MediaRecorder.isTypeSupported('audio/webm')) { // <2> | |
| console.warn('audio/webm is not supported') | |
| } | |
| const mediaRecorder = new MediaRecorder(stream, { // <3> | |
| mimeType: 'audio/webm', | |
| }) | |
| buttonStart.addEventListener('click', () => { | |
| mediaRecorder.start() // <4> | |
| buttonStart.setAttribute('disabled', '') | |
| buttonStop.removeAttribute('disabled') | |
| }) | |
| buttonStop.addEventListener('click', () => { | |
| mediaRecorder.stop() // <5> | |
| buttonStart.removeAttribute('disabled') | |
| buttonStop.setAttribute('disabled', '') | |
| }) | |
| mediaRecorder.addEventListener('dataavailable', event => { // <6> | |
| player.src = URL.createObjectURL(event.data) | |
| }) | |
| } |
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