The VideoLAN Forums

Posted: **09 Oct 2009 00:10**

hi all !

I'm using libvlc in my java application (a "media center") by using my own binding base on jvlc. I would like to know how to choose the audio output device (i have 2 sound cards on my computer : one for my computer, and i would like to use the other for films or anything else i watch on TV ). By this way i need to select the sound output device when i create my libvlc instance.
It seems in older versions of libvlc their was a function call : libvlc_audio_output_list_get(...) but jna can t find it anymore ...

I didn t find any thing in the libvlc documentation ... which is not very helpfull

I searched on all the net ... and i didn't find any help or example to do it by another way .... (3 days i m searching ...

)

thanks for any help !

Posted: **09 Oct 2009 12:05**

hi all !

I fixed my probleme : i upgrade to vlc 1.0.2 and i could now call the libvlc_audio_output_list_get() function !

But now my new probleme is how to use a libvlc_audio_output_t object in my java program.
I m using JNA in my own vlc binding, i know how to call native functions like "play", "pause", ... which not return anything but i don't exactly understand how JNA brings me back native's return object.

My java code :

Code: Select all

public class libvlc_audio_output_t extends PointerType
{
	public String psz_name;
	public String psz_description;
	public libvlc_audio_output_t p_next;
}

Code: Select all

public interface LibVlc extends Library 
{
     ...
     libvlc_audio_output_t libvlc_audio_output_list_get(LibVlcInstance instance, libvlc_exception_t exception);
}

Code: Select all

public class MediaPlayer {

  private List<MediaPlayerEventListener> eventListenerList = new ArrayList<MediaPlayerEventListener>();

  private final LibVlc libvlc = LibVlc.SYNC_INSTANCE;

  private final ExecutorService listenersService = Executors.newSingleThreadExecutor();

  private final String[] args;

  private LibVlcInstance instance;
  private LibVlcMediaInstance mediaPlayerInstance;
  private LibVlcEventManager mediaPlayerEventManager;
  private LibVlcCallback callback;

  private Canvas videoSurface;

....

  public void libvlcAudioOutputListGet()// it s a void type at this time for my tests 
  {
	  if(mediaPlayerInstance == null) 
	  {
		  throw new IllegalStateException("No media player instance");
	  }

	  libvlc_exception_t exception = new libvlc_exception_t();
	  System.out.println(libvlc.libvlc_audio_output_list_get(instance, exception).psz_name);//here i would like to have the name of the first audio output device 
	  checkException(exception);
  }

I read the JNA mappings "rules" in order to create my libvlc_audio_output_t class but i'm not sure to have understood exactly how it works ...

thanks for any help

Posted: **16 Oct 2009 16:10**

I am also interested in knowing how to do this. Has anyone got an example of using libvlc_audio_output_list_get from any language?

-Dave

Posted: **12 Sep 2010 01:24**

have the function return an IntPtr and then marshal it as ptrtostructure to your class, works like a charm

The VideoLAN Forums

how to select audio output device ?

how to select audio output device ?

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