public static AudioPlaybackDeviceManager GetInstance(IRtcEngine rtcEngine)
 {
     if (_audioPlaybackDeviceManagerInstance == null)
     {
         _audioPlaybackDeviceManagerInstance = new AudioPlaybackDeviceManager(rtcEngine);
     }
     return(_audioPlaybackDeviceManagerInstance);
 }
 public static void ReleaseInstance()
 {
     _audioPlaybackDeviceManagerInstance = null;
 }