sautiflow

Sautiflow is a cross-platform audio playback and processing engine for Dart and Flutter, powered by the C++ miniaudio library. It provides a high-level API for playlist management, gapless transitions, audio effects, and real-time status updates, all accessible via Dart FFI. Sautiflow supports native targets including Windows, Linux, Android, iOS, and macOS. Audiophiles and developers can leverage Sautiflow for building rich audio applications with advanced playback and processing capabilities.

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.

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Project inspired by just_audio for simplicity and familiarity of API design, but built on a custom native engine with a focus on advanced audio processing features and real-time capabilities.