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Re: [Vala] Problem with gstreamer bin

On Fri, Nov 14, 2008 at 6:22 PM, Spencer, Matthew <MSpencer nds com> wrote:

The problem I have with that approach however is that the elements will
be set to NULL after passing ownership to the bin, so I can no longer
use them in the functions.  What I need is the ability to pass ownership
and change them into weak references for the rest of the function scope.
I don't suppose there is any way of achieving this is there?


With bin.add you take a ref of the element so you can keep them using
in your function.

Gr,
Thijs



Matt

-----Original Message-----
From: Thijs Vermeir [mailto:thijsvermeir gmail com]
Sent: 14 November 2008 17:15
To: Spencer, Matthew
Cc: vala-list gnome org
Subject: Re: [Vala] Problem with gstreamer bin

On Fri, Nov 14, 2008 at 6:12 PM, Spencer, Matthew <MSpencer nds com>
wrote:

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?


Yes, that should also work.

Gr,
Thijs



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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