/** Retrieves the volume of the current audio playback device. * * @return * - The volume of the current audio playback device, if this method call succeeds. * - < 0: Failure. */ public override int GetAudioPlaybackDeviceVolume() { if (mEngine == null) { return((int)ERROR_CODE.ERROR_NOT_INIT_ENGINE); } return(IRtcEngineNative.getAudioPlaybackDeviceVolume()); }