austinried
c92d28c9dd
The app-thread transition callback was only ever a stopgap: media3 posts it after the playback thread has already rendered, so the first buffers of a new item could be scaled by the previous item's gain. media3 forwards the playback timeline and the current period to AudioProcessor.flush, and DefaultAudioSink flushes the processors on every sink configuration, which happens at each media item transition even when the format is unchanged. That is early enough to set the gain before any of the new item's buffers are processed, on the playback thread. See androidx/media#418. The processor resolves the period back to its MediaItem and reports it, so the gain maths and the preferences stay in ReplayGainController. That controller is now written from two threads, so its state is volatile. The transition callback stays as the fallback for a flush that carries no period: without it a stale gain would persist for a whole track rather than for a few milliseconds.
subtracks
subtracks is an open source Android client for Subsonic-compatible servers (Navidrome, gonic, LMS, Nextcloud Music and more). It is written natively in Kotlin and Jetpack Compose and gives you clean, convenient access to your music in the style of a modern media player.
Screenshots
Download
See signing/README.md for the fingerprints and the commands to verify a download.
Features
- Large Libraries: Built for very large libraries, from syncing the whole collection to playing playlists with thousands of tracks.
- Downloads: Song and bulk downloads, with download quality (encoding, bitrate) and metered-connection settings.
- Offline Mode: Stars, scrobbles and play counts queue up while you're offline and sync back to the server when you're online again.
- Artwork-first: Album and artist art everywhere, shown full-resolution in the detail and now playing views.
- Adaptive Theming: Colours drawn from the current song's artwork.
- Search: Fast search across the whole library, with per-list sort and filter controls.
- Playback: Gapless playback, an editable queue you can reorder and jump through, plus loop and shuffle modes.
- Up Next: Add items into the currently playing queue without rewriting it.
- Multiple Servers: Connect several servers and switch between them quickly.
- Stream Quality: Bitrate and format settings for Wi-Fi and mobile, with automatic switching.
- System Controls: Media notification and headset/Bluetooth controls.
Building
The project's entire toolchain is provided by a Nix flake. The default devshell provides JDK, Gradle and the Android SDK, so there is nothing to install by hand.
Therefore, to get started, you'll need to install Nix. I prefer Lix.
nix develop
gradle :app:assembleDebug
Test, lint and screenshot commands, plus the integration harness, are documented in AGENTS.md. The architecture is described in docs/architecture.md.
Contributing
The GitHub repository austinried/subtracks is a mirror of the repo hosted on my personal (private) code forge that syncs whenever I commit to it.
Bug reports and feature requests are accepted on GitHub, as well as pull requests, but:
- A well-crafted issue with clear reproduction and logs for bugs or mock-ups and use case details for features is preferred over a pull request
- Pull requests will be pulled in as patches to my code forge and then synced back (you'll still be the author, I'll be shown as the committer)
Translations
Want to see subtracks in your language? Visit the project on Weblate to help!
AI usage disclosure
This project contains code and documentation generated by LLM, which is created via human prompting, iteration and review. The current native rewrite is based on two (and a half) other iterations of this project that I coded by hand, so the architecture and other decisions behind that are all still coming from me.
License
subtracks is free software, licensed under the GNU General Public License v3.0. It has no ads and no telemetry, and uses only free/libre dependencies.