[vlc-devel] VLC Lib Media Descriptor Additional Callbacks

Pierre d'Herbemont pdherbemont at free.fr
Tue Oct 16 07:41:52 CEST 2007

Hello Enrique!

Thanks for the patch. I have a comment though. What about sending  
libvlc_MediaDescriptorDurationAvailable instead of  
libvlc_MediaDescriptorPreparsedChanged. It seems a bit more explicit  
to me.

The rest of the patch is fine for me.


On Oct 16, 2007, at 2:42 AM, Enrique Osuna wrote:

> For all that are interested, attached is a patch to add a few  
> functions that I've found very useful to the media descriptor objects.
> 1. Store user data in the descritpor - this current application  
> allows for the VLC.framework (MacOSX bindings) to create native  
> objects and associate the objects with media descriptor objects,  
> otherwise the integrity of the data is lost (or the VLC.framework  
> would have to maintain a local copy of all the media descriptors it  
> creates).  libvlc_media_descriptor_[gs]et_user_data.
> 2. Can now retrieve the duration of a media object's input, versus  
> retrieving the information from the playlist or a media instance.  
> libvlc_media_descriptor_get_duration.
> 3. Can now retrieve the preparsed state of a media object's input.   
> This information is useful when attempt to trap key data, for  
> instance one of my applications is that the program can't continue  
> until it's discovered what duration of a media object is.  It keeps  
> polling the length and the preparsed state, if the length is not  
> set and the preparsed state is true, then that means the duration  
> is not available so it errors out.
> 4. Added associated callbacks for duration and preparsed states.   
> When these values are changed libvlc_MediaDescriptorDurationChanged/ 
> vlc_InputItemDurationChanged and  
> libvlc_MediaDescriptorPreparsedChanged/ 
> vlc_InputItemPreparsedChanged events are invoked.
> Thanks for the feedback.
> Enrique
> <vlc-core-new-callbacks+hacks.patch>
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