microphone

Flutter (web-only at this moment) plugin for recording audio through the microphone.

Usage

To use this plugin, follow the installing guide.

Recording microphone audio

You need to create and initialize a MicrophoneRecorder in order to record audio.
Note that a single recorder can only make a single recording. Simply create a new recorder if you want to make another recording. Further note that you can also record simultaneously.

import 'package:microphone/microphone.dart';
// ...

// Create and initialize a recorder.
final microphoneRecorder = MicrophoneRecorder()..init();

The initialization happens asynchronously, which means that you might need to await the init method.

Now, you can start a recording.

import 'package:microphone/microphone.dart';
// ...

// Start recording audio.
microphoneRecorder.start();

Stopping it will give you access to a MicrophoneRecording in the value property:

import 'package:microphone/microphone.dart';
// ...

// Stop the recording.
await microphoneRecorder.stop();
final recordingUrl = microphoneRecorder.value.recording.url;

The recording is accessible through a URL and can be played back using e.g. just_audio's "read from URL" (requires adding a just_audio_web dependency as well; see the example app).

Additionally, you can retrieve the recorded bytes from a recorder (after the recording has been stopped and while the recorder has not yet been disposed).

import 'package:microphone/microphone.dart';
// ...

// Retrieves the recorded bytes.
final bytes = await microphoneRecorder.toBytes();

Do not forget to dispose the recorder:

import 'package:microphone/microphone.dart';
// ...

// Dispose the recorder.
microphoneRecorder.dispose();

Listening to state changes

MicrophoneRecorder is also a ValueNotifier, which means that it can e.g. be used with a Flutter ValueListenableBuilder or you can attach a listener using MicrophoneRecorder.addListener.
Whenever MicrophoneRecorder.value.started or MicrophoneRecorder.value.stopped changed, you will be notified. See the example app for an example usage.

Learn more

If you want to learn more about how this plugin works, how to contribute, etc., you can read through the main README on GitHub.