just_audio with MPV #

This platform interface allows you to use just_audio on Linux with the user's installed MPV.

This uses mpv_dart, which uses a local socket to communicate with mpv over JSON IPC. mpv takes care of all the file loading, shuffling, looping, pretty much everything.

Installation #

Users with software that uses just_audio_mpv have to install mpv. A recent version is highly recommended. The mpv binary must be present in the PATH. One of the following commands should do this for you:

For Debian and Ubuntu, add this repository and run:

sudo apt update
sudo apt install mpv

For Arch, get https://aur.archlinux.org/packages/mpv-git/ via AUR and install it. This can be done with something like:

yay -S mpv-git

For Fedora:

sudo yum install mpv

If your app is to be packaged as a Flatpak, you can add io.mpv.Mpv as a dependency (don't ask me how, I've never built for it) or bundle a custom build.

For other distributions, you might want to look into https://mpv.io/installation/.

Currently it is not possible to tell just_audio_mpv to use an asset-bundled mpv.

Checking for MPV #

To check whether MPV is installed, first check if it's going to be used (with if (Platform.isLinux)), then check the exit code of the command which mpv. If it returns 0, MPV is present and you can continue. If it returns 1, MPV is not present. Any other error codes are likely indicative of the which command not being present-- good luck getting a Flutter app to run on a machine that doesn't have basic tools like which.

// In a synchronous environment, optimally before the runApp(MyApp()) call and/or with a
// splash/loading screen available:
// (Note: asynchronous is preferred where possible, but `which` is an instant command
// so running it synchronously should not hurt performance.)
if (Platform.isLinux && Process.runSync("which", ["mpv"]).exitCode != 0) {
  // Tell the user somehow that MPV is not installed,
  // point them to this page, and prevent them from
  // trying to play audio.
}
// If you're running in an environment where audio support is considered absent by default,
// you can check for MPV's presence asynchronously like this:
final which = Process.run("which", ["mpv"]);
if (which.exitCode == 0) {
  canPlayAudio = true;
}

For Windows the command would be Get-Command for PowerShell and where for CMD.

Logging #

If you want centralized, controlled, or pretty logging, you can use the below example to tell just_audio_mpv to log to wherever you want instead. It logs to console by default, so for most debugging purposes nothing needs to be done.

Please note: the dynamic error parameter may include non-error information that may be useful in debugging, such as what track it is attempting to load. It is typically null.

// Map your various log levels to MPV's:
const _logLevelMap = {
  JAMPV_LogLevel.debug: LogLevel.debug,
  JAMPV_LogLevel.info: LogLevel.info,
  JAMPV_LogLevel.warning: LogLevel.warning,
  JAMPV_LogLevel.error: LogLevel.error,
  JAMPV_LogLevel.verbose: LogLevel.verbose,
  JAMPV_LogLevel.none: LogLevel.debug,
};
mpvLog = (dynamic message, {dynamic error, JAMPV_LogLevel level = JAMPV_LogLevel.debug, StackTrace stackTrace}) {
  // Run your logging function of choice here.
  // For example, if using Pinelogger:
  justAudioMpvPinelogger.log(message, severity: _logLevelMap[level]!, error: error, stackTrace: stackTrace);
};

Features #