sautiflow #

Cross-platform Dart audio package backed by a C++ miniaudio engine.

Current release: 0.2.0

Features #

• Playlist engine (set/add/insert/remove/move)
• Gapless transitions between tracks
• Play/pause/stop/seek/next/previous/jump
• Shuffle + loop modes (off, all, one)
• FX chain: gain, pan, EQ (3-band), multiband EQ, reverb, low-pass, high-pass, band-pass, delay, peak EQ, notch, low-shelf, high-shelf
• Pollable player status and stream updates
• Native targets: Windows, Linux, Android, iOS/macOS

Public Dart API #

Import:

import 'package:sautiflow/sautiflow.dart';

Example (playlist + controls) #

final player = MiniAudioPlayer();
player.init();

final playlist = <AudioSource>[
  AudioSource.uri(Uri.parse('https://example.com/track1.mp3')),
  AudioSource.uri(Uri.parse('https://example.com/track2.mp3')),
  AudioSource.uri(Uri.parse('https://example.com/track3.mp3')),
];

player.setAudioSources(
  playlist,
  initialIndex: 0,
  initialPosition: Duration.zero,
  useLazyPreparation: true,
);

player.play();
player.seekToNext();
player.seekToPrevious();
player.seekTo(const Duration(seconds: 0), index: 2);
player.setLoopMode(LoopMode.all);
player.setShuffleModeEnabled(true);

player.addAudioSource(AudioSource.uri(Uri.parse('https://example.com/new.mp3')));
player.insertAudioSource(1, AudioSource.uri(Uri.parse('https://example.com/ins.mp3')));
player.removeAudioSourceAt(3);
player.moveAudioSource(2, 1);

player.setEqEnabled(true);
player.setEq(low: 1.2, mid: 1.0, high: 1.1);
player.setReverbEnabled(true);
player.setReverb(mix: 0.2, feedback: 0.6, delayMs: 100);

// Advanced filters / parametric shaping
player.setBandpass(enabled: true, cutoffHz: 1000, q: 0.8);
player.setPeakEq(enabled: true, gainDb: 3.0, q: 1.0, frequencyHz: 2500);
player.setNotch(enabled: true, q: 10.0, frequencyHz: 60);
player.setLowshelf(enabled: true, gainDb: 4.0, slope: 1.0, frequencyHz: 100);
player.setHighshelf(enabled: true, gainDb: 2.5, slope: 1.0, frequencyHz: 10000);

Native build outputs #

Expected library names by platform:

• Windows: audio_engine.dll
• Linux/Android: libaudio_engine.so
• macOS: libaudio_engine.dylib
• iOS: statically linked (DynamicLibrary.process())

Flutter plugin structure #

This package is configured as a Flutter FFI plugin in pubspec.yaml with:

• Android (ffiPlugin: true)
• iOS (ffiPlugin: true)
• Linux (ffiPlugin: true)
• Windows (ffiPlugin: true)

Platform native build configs are included:

• android/src/main/cpp/CMakeLists.txt
• ios/sautiflow.podspec
• linux/CMakeLists.txt
• windows/CMakeLists.txt

Build scripts #

• Windows: tool/build_windows.ps1
• Linux: tool/build_linux.sh
• Android (NDK): tool/build_android.sh
• Android (NDK, PowerShell): tool/build_android.ps1
• Apple (iOS + macOS): tool/build_apple.sh

Packaging notes #

For Flutter app integration, keep native artifacts available in app/plugin output:

• Android: android/src/main/jniLibs/<abi>/libaudio_engine.so
• iOS: link audio_engine.xcframework in Xcode/Podspec
• Windows: place audio_engine.dll next to executable
• Linux: ship libaudio_engine.so with app bundle and ensure loader path

Android native network streaming (libcurl) #

Android now attempts to enable native URL streaming by default.

• If libcurl is found (explicit path or bundled per ABI), native network streaming is enabled.
• If not found, Android build continues and falls back to non-native URL handling (no build break).

Optional overrides (Gradle project properties):

• MINIAUDIODART_ENABLE_CURL=ON|OFF
• MINIAUDIODART_CURL_INCLUDE_DIR=/path/to/include
• MINIAUDIODART_CURL_LIBRARY=/path/to/libcurl.so
• MINIAUDIODART_CURL_LIBRARY_DIR=/path/to/abi-parent

Example #

See example/main.dart for a complete usage sample.