openPlayer
  openPlayer method
- dynamic isBGService = false,
 
Open the Player.
A player must be opened before used. Opening a player takes resources inside the system. Those resources are freed with the verb closePlayer().
Return
Returns a Future, but the App does not need to wait the completion of this future before doing a startPlayer(). The Future will be automaticaly waited by startPlayer().
Example
    myPlayer = await FlutterSoundPlayer().openPlayer();
    ...
    (do something with myPlayer)
    ...
    await myPlayer.closePlayer();
    myPlayer = null;
See also
- closePlayer()
 
Implementation
Future<FlutterSoundPlayer?> openPlayer({isBGService = false}) async {
  //if (!Platform.isIOS && enableVoiceProcessing) {
  //throw ('VoiceProcessing is only available on iOS');
  //}
  if (_isInited != Initialized.notInitialized) {
    return this;
  }
  if (isBGService) {
    await MethodChannel(
      "xyz.canardoux.flutter_sound_bgservice",
    ).invokeMethod("setBGService");
  }
  Future<FlutterSoundPlayer?>? r;
  await _lock.synchronized(() async {
    r = _openPlayer();
  });
  return r;
}