flutter_opus #

A Flutter plugin for Opus audio codec encoding and decoding using FFI (Foreign Function Interface).

Features #

• ✅ Opus audio decoding
• ✅ Opus audio encoding
• ✅ iOS support with static library
• ✅ macOS support with static library
• ✅ Android support with shared library
• ✅ Pure Dart API using FFI
• ✅ Memory efficient
• ✅ Low latency

Installation #

Add this to your package's pubspec.yaml file:

dependencies:
  flutter_opus: ^latest

Usage #

Decoding Opus Data #

import 'package:flutter_opus/flutter_opus.dart';

// Create the decoder
final decoder = OpusDecoder.create(
  sampleRate: 48000,
  channels: 1,
);

// Decode Opus data (Uint8List) to PCM (Uint8List)
final pcmData = decoder?.decode(opusData, frameSize);

decoder?.dispose(); // Dispose decoder when done

Encoding PCM Data #

import 'package:flutter_opus/flutter_opus.dart';

// Create the decoder
final decoder = OpusDecoder.create(
  sampleRate: 48000,
  channels: 1,
);

// Decode Opus data (Uint8List) to PCM (Uint8List)
final pcmData = decoder?.decode(opusData, frameSize);

decoder?.dispose(); // Dispose decoder when done

Get Version #

final version = OpusDecoder.getVersion();
print('Opus version: $version');

Supported Platforms #

• ✅ iOS (with Opus static library)
• ✅ Android (coming soon)
• ❌ macOS (coming soon)
• ❌ Windows (coming soon)
• ❌ Linux (coming soon)

Requirements #

iOS #

• iOS 12.0 or later
• Opus static library (libopus.a) compiled for iOS architectures

Android #

• Android 5.0 (API 21) or later
• Requires Opus shared library (libopus.so) bundled in the APK

Example #

See the example directory for a complete working example.

API Reference #

OpusDecoder #

• OpusDecoder.create({required int sampleRate, required int channels}) - Create decoder
• decode(Uint8List opusData, int frameSize) - Decode Opus data to PCM
• dispose() - Free resources
• OpusDecoder.getVersion() - Get Opus library version

OpusEncoder #

• OpusEncoder.create({required int sampleRate, required int channels, int application}) - Create encoder
• encode(Int16List pcmData, int frameSize) - Encode PCM data to Opus
• setBitrate(int bitrate) - Set encoding bitrate
• setComplexity(int complexity) - Set encoding complexity (0-10)
• dispose() - Free resources

License #

This project is licensed under the MIT License - see the LICENSE file for details.

Contributing #

Contributions are welcome! Please feel free to submit a Pull Request.