play method

Implementation

@override
Future<void> play([int delay = 0]) async{
		if (_isPlaying) {
			console.warning( 'Audio: Audio is already playing.' );
			return;
		}

		if(!hasPlaybackControl){
			console.warning( 'Audio: this Audio has no playback control.' );
			return;
		}

  _isPlaying = true;

  if(source == null){
    if(delay != 0){
      _delay = Timer(Duration(milliseconds: delay), (){
        _play();
        _delay?.cancel();
        _delay = null;
      });
    }
    else{
      _play();
    }
  }
  else{
    replay();
  }
}