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如何通过用户麦克风录制音频

François Beaufort

在 Web 平台上，可以使用 Media Capture and Streams API 访问用户的摄像头和麦克风。getUserMedia() 方法会提示用户访问摄像头和/或麦克风，以捕获媒体流。然后，可以使用 MediaRecorder API 记录此视频流，也可以通过网络与他人分享。可以通过 showOpenFilePicker() 方法将录制内容保存到本地文件。

以下示例展示了如何以 WebM 格式录制用户麦克风中的音频，并将录制内容保存到用户的文件系统中。

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.addEventListener("click", () => {
  // Stop the stream.
  stream.getTracks().forEach(track => track.stop());
});

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/articles/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.addEventListener("click", () => {
  // Stop the recording.
  recorder.stop();
});