native_audio_trimmer

A Flutter plugin for trimming audio files on both Android and iOS platforms without using FFmpeg.

Features

  • Trim audio files by specifying start and end times
  • Native implementation for iOS (using AVAssetExportSession)
  • Native implementation for Android (using MediaExtractor, MediaCodec, and MediaMuxer)
  • No FFmpeg dependency, resulting in smaller app size and faster builds
  • Support for multiple audio formats

Installation

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

dependencies:
  native_audio_trimmer: ^0.0.4

Android

Add the storage permissions to your AndroidManifest.xml if you're targeting Android 12 or below and need to access files outside of your app's directory:

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

For Android 13+ (API level 33+), you may need to request more specific permissions depending on your use case:

<uses-permission android:name="android.permission.READ_MEDIA_AUDIO" />

iOS

No additional setup is required for iOS.

Usage

import 'package:native_audio_trimmer/native_audio_trimmer.dart';

// Create an instance of AudioTrimmer
final audioTrimmer = AudioTrimmer();

// Trim an audio file
try {
  String inputPath = '/path/to/input.mp3';
  String outputPath = '/path/to/output.m4a';
  
  // Trim from 10 seconds to 30 seconds
      // Trim audio
      final trimmedFilePath = await NativeAudioTrimmer.trimAudio(
        inputPath: inputPath,
        outputPath: outputPath,
        startTimeInSeconds: 10.0, // Start time in seconds,
        endTimeInSeconds: 30.0, // End time in seconds,
      );
  
  print('Trimmed audio saved at: $trimmedFilePath');
} catch (e) {
  print('Error trimming audio: $e');
}

Example

Check out the example app in the example folder to see a complete implementation of audio file selection, trimming, and playback.

To run the example app:

cd example
flutter run

Implementation Details

iOS

On iOS, this plugin uses the native AVAssetExportSession to perform audio trimming operations. The resulting audio file is saved in the .m4a format.

Android

On Android, the plugin uses a combination of MediaExtractor, MediaCodec, and MediaMuxer to extract, process, and save the audio data between the specified start and end times.

Supported Formats

Input Formats

  • MP3
  • M4A/AAC
  • WAV
  • OGG (Android only)
  • FLAC

Output Format

  • M4A (AAC) for both platforms

Limitations

  • The plugin currently only outputs to M4A format
  • Very large audio files may require additional memory
  • Some exotic audio formats might not be supported by the native APIs

Contributing

Contributions are welcome! If you find a bug or want a feature, please open an issue on GitHub.

License

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

Libraries

native_audio_trimmer