audio_io 0.2.0

Very simple interface to provide a stream of audio data for processing/visualising in Flutter

audio_io

A Flutter plugin for real-time audio streaming between iOS/macOS and Flutter/Dart. Provides low-latency audio processing, recording, and visualization with minimal code.

Features

• Simple audio data streaming from platform to Flutter
• Input audio stream as Stream<List<double>> (frames/chunks)
• Output audio sink for playback
• Low-latency audio processing
• Format description for input/output
• Supports iOS and macOS platforms

Platform Support

Platform	Status
iOS	✅ Supported
macOS	✅ Supported
Android	❌ Not yet implemented
Linux	❌ Not yet implemented
Windows	❌ Not yet implemented
Web	❌ Not yet implemented

Getting Started

Installation

Add audio_io to your pubspec.yaml:

dependencies:
  audio_io: ^0.2.0

iOS Setup

Add microphone usage description to your Info.plist:

<key>NSMicrophoneUsageDescription</key>
<string>This app needs access to the microphone for audio processing.</string>

macOS Setup

1. Add microphone usage description to your macos/Runner/Info.plist:

<key>NSMicrophoneUsageDescription</key>
<string>This app needs access to the microphone for audio processing.</string>

2. Enable audio input in your entitlements files:
   • macos/Runner/DebugProfile.entitlements
   • macos/Runner/Release.entitlements

<key>com.apple.security.device.audio-input</key>
<true/>

Usage

import 'package:audio_io/audio_io.dart';

// Get the audio instance
final audioIo = AudioIo();

// Start audio processing
await audioIo.start();

// Listen to input audio stream
audioIo.inputAudioStream.listen((audioData) {
  // Process audio data (List<double>)
  print('Received ${audioData.length} samples');
});

// Send audio to output
audioIo.outputAudioStream.add(audioData);

// Stop audio processing
await audioIo.stop();

Audio Format

• Sample Rate: 48kHz (adapts to device)
• Channels: Mono
• Data Type: Double precision floats (Float64)
• Internal Processing: Float32

Requirements

• Dart SDK: >=3.0.0 <4.0.0
• Flutter: >=3.10.0
• iOS: 12.0 or higher
• macOS: 10.15 or higher

License

See LICENSE file for details.