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Description:

mic stream

mic_stream: 0.7.1 #
[Flutter Plugin]
Provides a tool to get the microphone input as 8 or 16 bit PCM Stream.
32 bit and floating point PCM are experimental WIP.
About mic_stream: #
As Flutter still lacks some functionality, this plugin aims to provide the possibility to easily get an audio stream from the microphone of mobile devices.
How to use: #
The plugin mainly provides one method to provide a raw audio stream:
Stream<UInt8List> MicStream.microphone({options})
and a StreamTransformer to provide a Stream of individual samples (not lists of samples):
MicStream.toSampleStream
that you can use to transform your mic stream:
stream.transform(MicStream.toSampleStream)
Listening to this stream starts the audio recorder
while cancelling the subscription stops the stream.
Available options are as follows:
audioSource: AudioSource // The microphone you want to record from
sampleRate: int // The amount of data points to record per second
channelConfig: ChannelConfig // Mono or Stereo
audioFormat: AudioFormat // 8 bit PCM or 16 bit PCM. Other formats are not yet supported
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Some configuration options are platform dependent and can differ from the originally configured ones.
You can check the real values using:
Future<int> sampleRate = await MicStream.sampleRate;
Future<int> bitDepth = await MicStream.bitDepth;
Future<int> bufferSize = await MicStream.bufferSize;
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Permissions #
Make sure you have microphone recording permissions enabled for your project.
To do so, add this line to the AndroidManifest.xml:
<uses-permission android:name="android.permission.RECORD_AUDIO"/>
In the Info.plist:
<key>NSMicrophoneUsageDescription</key>
<string>Microphone access required</string>
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You can disable the permission request dialogue by calling
MicStream.shouldRequestPermission(false)
This will lead to an error if no permission to record audio has been requested, though.
For MacOS:
Open macos/Runner.xcworkspace
click Runner -> Signing & Capabilities -> Check "Audio Input"
Example:
// Init a new Stream
Stream<List<int>> stream = await MicStream.microphone(sampleRate: 44100);

// Start listening to the stream
StreamSubscription<List<int>> listener = stream.listen((samples) => print(samples));
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// Transform the stream and print each sample individually
stream.transform(MicStream.toSampleStream).listen(print);
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// Cancel the subscription
listener.cancel()
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Note: This plugin is still under development, and some APIs might not be available yet.
Feedback and
Pull Requests are most welcome!