Video effects

[Thierry Bastian]

FYI under windows there are no default video effects available ;-)

 

Thierry

 

From: Richard [mailto:richardmg at trolltech.com] 
Sent: vendredi 13 juillet 2007 13:57
To: Thierry Bastian
Cc: phonon-backends at kde.org
Subject: Re: Video effects

 

I agree that creating a separate class for every kind of effect seems like
not a good idea (Therefore I didn't suggest it either) My main issue is that
it will be impossible to write a cross-platform app with phonon that uses
any of the effects? E.g. the Gaussian blur effect on mac (using core image
filters) is called CIGaussianBlur. While I guess e.g. Windows has a similar
filter, but called something slightly different?

 

So the only thing the user can do with any of the effects is to show them in
a list to the app-user to choose from?

With the enumeration style it will not make phonon bigger, and at least you
can use the effects cross platform programatically, with perhaps using
default values for the parameters (if we cannot come up with something
better).

 

I'm not saying the below solution is the best, I just wonder if we can solve
this in a more cross platform way...

 

-Richard

 





The problem is still the same: we can't easily have a common base of

effects. So adding a GaussianBlurEffect class would not make sense out of

the Quicktime world.

 

Thinking loud: Maybe a factory could do that job?

 

Thierry

 

-----Original Message-----

From: Matthias Kretz [mailto:kretz at kde.org] 

Sent: vendredi 13 juillet 2007 13:23

To: phonon-backends at kde.org

Subject: Re: Video effects

 

On Friday 13 July 2007, Richard wrote:

What I would prefer is something more like this:

---

     if (Backendcapabilies::hasVideoEffect(Effect::GaussianBlur))

            Effect * e = new Effect(Effect::GaussianBlur, parent);

 

or alternatively:

 

     Effect * e = new Effect(Effect::GaussianBlur, parent);

     if (e->isValid()){

         ...

     }

---

 

Why not go the whole way and provide

GaussianBlurEffect *e = new GaussianBlurEffect(parent); if (e->isValid()) {

    ...

}

then? Because otherwise you still have no guarantees about the parameters.

 

The generic Effect class was meant to be used by user interaction only. If

an app needs to integrate an effect then it needs a specialized interface to

that effect.

 

This, of course, will blow up the lib size again so perhaps this should be

in a second library or #ifdefed as a feature?

 

--

________________________________________________________

Matthias Kretz (Germany)                            <><

http://Vir.homelinux.org/

MatthiasKretz at gmx.net, kretz at kde.org,

Matthias.Kretz at urz.uni-heidelberg.de

 

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--

Richard Moe Gustavsen

Software Engineer II, Trolltech ASA

Sandakerveien 116, NO-0484 Oslo, Norway





 

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