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HTML
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<link
rel="icon"
href="data:image/svg+xml,<svg xmlns=%22http://www.w3.org/2000/svg%22 viewBox=%220 0 100 100%22><text y=%22.9em%22 font-size=%2290%22>🎙️</text></svg>"
/>
<title>How to record audio from the user's microphone</title>
</head>
<body>
<h1>How to record audio from the user's microphone</h1>
<button id="startMicrophoneButton">Start using microphone</button>
<button id="stopMicrophoneButton" disabled>Stop using microphone</button>
<button id="startRecordButton" disabled>Start recording</button>
<button id="stopRecordButton" disabled>Stop recording</button>
<pre id="logs"></pre>
</body>
</html>
CSS
:root {
color-scheme: dark light;
}
html {
box-sizing: border-box;
}
*,
*:before,
*:after {
box-sizing: inherit;
}
body {
margin: 1rem;
font-family: system-ui, sans-serif;
}
button {
display: block;
margin-bottom: 4px;
}
pre {
color: red;
white-space: pre-line;
}
JS
const startMicrophoneButton = document.querySelector('#startMicrophoneButton');
const stopMicrophoneButton = document.querySelector('#stopMicrophoneButton');
const startRecordButton = document.querySelector('#startRecordButton');
const stopRecordButton = document.querySelector('#stopRecordButton');
let stream;
let recorder;
startMicrophoneButton.addEventListener("click", async () => {
// Prompt the user to use their microphone.
stream = await navigator.mediaDevices.getUserMedia({ audio: true });
recorder = new MediaRecorder(stream);
stopMicrophoneButton.disabled = false;
startRecordButton.disabled = false;
log("Your microphone audio is being used.");
});
stopMicrophoneButton.addEventListener("click", () => {
// Stop the stream.
stream.getTracks().forEach(track => track.stop());
startRecordButton.disabled = true;
stopRecordButton.disabled = true;
log("Your microphone audio is not used anymore.");
});
startRecordButton.addEventListener("click", async () => {
// For the sake of more legible code, this sample only uses the
// `showSaveFilePicker()` method. In production, you need to
// cater for browsers that don't support this method, as
// outlined in https://web.dev/patterns/files/save-a-file/.
// Prompt the user to choose where to save the recording file.
const suggestedName = "microphone-recording.webm";
const handle = await window.showSaveFilePicker({ suggestedName });
const writable = await handle.createWritable();
// Start recording.
recorder.start();
recorder.addEventListener("dataavailable", async (event) => {
// Write chunks to the file.
await writable.write(event.data);
if (recorder.state === "inactive") {
// Close the file when the recording stops.
await writable.close();
}
});
stopRecordButton.disabled = false;
log("Your microphone audio is being recorded locally.");
});
stopRecordButton.addEventListener("click", () => {
// Stop the recording.
recorder.stop();
stopRecordButton.disabled = true;
log("Your microphone audio has been successfully recorded locally.");
});
Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.
Last updated 2023-09-26 UTC.
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{
"lastModified": "Last updated 2023-09-26 UTC.",
"confidential": False
}