Re: iChat perspective view
Re: iChat perspective view
- Subject: Re: iChat perspective view
- From: Lorenzo <email@hidden>
- Date: Sun, 18 Jul 2004 01:09:48 +0200
Hi,
thank you for replying. Yes, I supposed that they used OpenGL.
And I have seen some OpenGL samples about video to textures.
Personally I use glTexSubImage2D (I have learned just from the Apple samples
code) in order to get each video frame to texture. It works well with about
360 x 240 frame. But if the frame is larger, everything runs so slow. So I
can't understand how they can run 4 video (I presume about 360 x 240 each
one too) simultaneously. Can you tell me exactly which Apple sample code did
you mentioned? Maybe I lost something better about the latest technologies.
Best Regards
--
Lorenzo
email: email@hidden
>
From: Shaun Wexler <email@hidden>
>
Date: Sat, 17 Jul 2004 14:21:47 -0700
>
To: Cocoa Development <email@hidden>
>
Cc: Lorenzo <email@hidden>
>
Subject: Re: iChat perspective view
>
>
On Jul 17, 2004, at 12:52 PM, Lorenzo wrote:
>
>
> Hi,
>
> I have just seen the Tiger QT KeyNote movie at Apple.com and I ask
>
> that to
>
> myself: which technology does Apple use to display the iChat Video
>
> Conference image in a perspective view? OpenGL? As I experienced OpenGL
>
> doesn't allow to manage great amount of movie data. So, when the users
>
> are
>
> 10, taking the whole screen, how can they use OpenGL? Maybe "Core
>
> Image"?
>
> Have you a vague idea?
>
>
It's quite simple to perform in OpenGL, using texture-mapped
>
quadrilaterals, with efficient streaming of video frames with
>
hardware-accelerated rendering directly to textures. There are a few
>
examples in Apple Sample Code to show you how to do this. I believe
>
that the new iChat AV in Tiger will allow the 3D video conferencing
>
between up to 4 simultaneous users (including yourself), and audio
>
conferencing will be limited to 10 users. The maximum frame rate of
>
[iSight] video is 30 fps... but in my own experience I don't think it's
>
often even close to that, more like 10 fps. CoreImage/CoreVideo are
>
still under NDA.
>
--
>
Shaun Wexler
>
MacFOH
>
http://www.macfoh.com
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