Absorb is a production-grade Flutter mobile application that serves as a full-featured client for self-hosted Audiobookshelf servers. It streams and downloads audiobooks and podcasts, providing offline playback, sleep timer, bookmarking, chapter navigation, built-in equalizer, on-device speech-to-text transcription via whisper.cpp, and an ebook reader. The architecture is a cross-platform Flutter app with extensive native platform code (Kotlin for Android, Swift/ObjC for iOS) that deeply integrates with Android Auto, Apple CarPlay, Wear OS, Chromecast, and home-screen widgets. Audio playback is managed by a highly customized audio_service plugin with a native iOS audio engine (AbsorbAudioEngine) that handles cross-book transitions and equalizer effects. The transcription feature uses a forked whisper_ggml_plus package with a voxel-activity detection and MP3 slicer for frame-accurate clip extraction. The codebase demonstrates high craftsmanship in platform-level audio handling, but its reliance on multiple vendored plugins (audio_service, just_audio, flutter_carplay, whisper_ggml_plus, flutter_epub_viewer) creates maintenance overhead due to duplicated native code across platforms and occasional divergence from upstream versions.
This repository is a Flutter plugin that bridges Flutter applications with Apple CarPlay and Android Auto in-car infotainment systems. It provides a Dart API to construct native vehicle-optimized UI templates (lists, grids, tab bars, alerts, search, etc.) and manage navigation stacks on both platforms. The architecture is a classic Flutter plugin pattern: Dart models serialize to JSON, which is passed via method channels to native iOS (Swift) and Android (Kotlin) implementations that render the corresponding native CarPlay/Android Auto templates. Event channels handle user interactions (list item selection, alert actions, connection changes) back to Dart. The plugin includes a sophisticated SVG rasterization utility that converts Flutter asset SVGs to PNG bytes for native consumption, since native platforms cannot render SVG directly. It also provides image loading with caching and tinting on both platforms. The example app demonstrates full setup and usage for both iOS and Android, including scene delegate configuration and Android Auto service registration. External dependencies include the Flutter SDK, flutter_svg for rasterization, and native frameworks (CarPlay.framework on iOS, Car App API on Android).
SimpMusic is a production-grade Kotlin Multiplatform music player for Android and desktop (JVM) that streams from YouTube Music's undocumented backend. The codebase is organized around a shared Compose Multiplatform UI module (composeApp), Android entry points (androidApp), a desktop entry point (desktopApp), and optional feature modules for Google Cast, Last.fm scrobbling, and crash reporting. A separately referenced core submodule supplies domain and media-service logic. Internally it uses MVVM with Koin dependency injection, Repository interfaces backed by Room entities and DataStore, StateFlow-based ViewModels, and a large custom Compose component library covering home feed, library management, playlist sync, fullscreen player, lyrics, equalizer, podcasts, Android home-screen widgets, and a desktop mini-player. The app is shipped as a packaged consumer application with Play Store metadata, GitHub Actions, fastlane changelogs, and build variants that swap real integrations for empty stubs in FOSS builds.