Re: [Vala] Problem with gstreamer bin

["Spencer, Matthew" <MSpencer nds com>]

I thought it was something like this.  Thanks for the feedback, this has
fixed the problem.

Reading through the documents, shouldn't I be able to do something like:

  bin.add_many(#element1,#element2,#elemenr3)

To indicate to valac the passing of ownership to the bin?

Matt

-----Original Message-----
From: Thijs Vermeir [mailto:thijsvermeir gmail com] 
Sent: 14 November 2008 17:07
To: Spencer, Matthew
Cc: vala-list gnome org
Subject: Re: [Vala] Problem with gstreamer bin

Hi,

2008/11/14 Spencer, Matthew <MSpencer nds com>:
> Hi Guys
>
> I am playing with Vala with a view to presenting information about it 
> at our companies developer conference in a couple of weeks.  With this

> in mind I am trying to build up a test application that shows video 
> playback using GStreamer.  I am having problems with the following
code:
> private Element createVideoBin() {
>   var bin=new Bin("videobin");
>   var queue=ElementFactory.make("queue","queue");
>   var sink=ElementFactory.make("autovideosink","videosink");
>   var ghostPad=new GhostPad("sink",queue.get_pad("sink"));
>   bin.add_many(queue,sink);
>   queue.link(sink);
>   bin.add_pad(ghost);
>   return(bin);
> }

bin.add_many is the problem because the c function takes the ownership,
but the bindings don't do it. Just use bin.add for every element as a
workaround...

Gr,
Thijs

> When attempting to use the returned bin, I get a segfault.  This is 
> because (I think, on examining the generated C code) the elements are 
> being unrefd before the bin is returned.  I am sure this is not
supposed to happen.
> I get a number of error messaged when running the app:
> (mystreamer:16361): GStreamer-CRITICAL **:
> Trying to dispose of object "videosink", but it still has a parent 
> "videobin".
> You need to let the parent manage the object instead of unreffing the 
> object directly.
>
> I am assuming this is because I need to inform the code that I wish to

> transfer ownership of the objects to the 'Bin', but how do I do this, 
> and is there a way that this can be picked up by the compiler to 
> prevent this type of problem?
>
> Cheers
>
> Matt
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