Robert Osfield wrote:
Hi Hartmut,
On Sat, Jul 26, 2008 at 2:02 AM, Hartmut Seichter
<[EMAIL PROTECTED]> wrote:
Well, osgART has a number of PlugIns implementing their own
osgART::VideoImageStream which implements update slightly
different. But I am happy to quickly change things over as we are targeting
the latest OSG
For 2.6 all original ImageStream implementation - the ones in the
Quicktime and Xine plugins are all exactly the same as before, and
function in exactly the same way. osgArt::VideoImageStream should be
no different - all existing mechanisms will work.
The new Image::update(..) method is only called if you attach an
update callback to the texture, this is something that is now done
automatically for osg::ImageSequence images being assigned to
textures, but not for any other Image types. You could add this is
you so wished.
That was exactly what we did with osgART ... we attached a
osgART::ImageUpdateCallback in order to trigger the update. I think I
will dive more into ImageStream and ImageSequence to see if we can get
rid of our (osgART) additional implementation.
Are there any plans to differentiate between open() and play() ... this was
the main reason for us to have osgART::VideoImageStream as we need to know
in osgART which dimensions and colorspace the imagestream supports
I haven't made any other plans for ImageStream. ImageSequence is just
a subclass of it at present. The osgDB::ImagePager is a companion to
it, which could expand in its role - for instance it could potentially
drive the various ImageStream classes, so rather than have their own
threads, they'd use the ImagePager's ImageThreads to drive them. This
would help when handling many video streams at one time, and also
improve the handling of thread cancellation on exit.
Yes, that is one area where we have some additional logic in VideoStream
to deal with threading issues like locking, or double buffering. As I
said before I need to take a deeper look ImageSequence and the
ImagePager which might solve a lot of problems for us already.
Cheers,
Hartmut
Robert.
_______________________________________________
osg-users mailing list
[email protected]
http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
--
Hartmut Seichter, PhD (HKU), Dipl-Ing.(BUW), Postdoctoral Fellow, HITLabNZ
_______________________________________________
osg-users mailing list
[email protected]
http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
