From kde-multimedia  Fri Mar 28 13:55:19 2008
From: Matthias Kretz <kretz () kde ! org>
Date: Fri, 28 Mar 2008 13:55:19 +0000
To: kde-multimedia
Subject: Re: Konrad Materka, GSOC proposal
Message-Id: <200803281455.24757.kretz () kde ! org>
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Hi Konrad,

I read your proposal, thought one night about it and chatted with hftom=20
(Kaffeine developer) about it. And I have a suggestion for you to consider=
=20
changing your application and with that fully integrate into Phonon and mak=
e=20
it more flexible.

=46irst I need to say that I like your SoC application and ideas. Especiall=
y the=20
widget idea also made me think to see a bigger picture.

Here's what I think an application using ext. subtitles with Phonon could l=
ook=20
like:

using Phonon::MediaObject;
using Phonon::AudioOutput;
using Phonon::VideoWidget;
using Phonon::SubtitleWidget;
using Phonon::Port;

MediaObject m;
m.setCurrentSource(Phonon::Dvd);
MediaObject sm;
sm.setCurrentSource(urlToSubtitles);
Synchronizer sync;
sync.addMediaObject(&m);
sync.addMediaObject(&sm);
AudioOutput ao(Phonon::VideoCategory);
VideoWidget vw;
vw.show();
Phonon::createPath(&m, &ao);
Phonon::createPath(&m, Port(Phonon::Video), &vw);
Port port =3D sm.openPort(Phonon::Subtitles, "pixmap");
SubtitleWidget swidget;
Phonon::createPath(&sm, port, &swidget);

This code uses several ideas that are not yet implemented in Phonon but wil=
l=20
probably get started on in the near future. Those are:
a) Synchronizer: Some class to combine multiple MediaObjects (sources) into=
=20
one or just to start/stop multiple sources in sync. This will also be a=20
requirement for audio/video editors.
b) Port: this class will be added to allow more fine grained control over w=
hat=20
actually gets connected. E.g. the line
Phonon::createPath(&m, Port(Phonon::Video), &vw);
will only create a video connection between m and vw. Per default also a=20
subtitle connection would have been made and the subtitles of the DVD would=
=20
be shown on the VideoWidget. Now no subtitles will be shown at all.
The openPort call tells the MediaObject to create a stream of pixmaps where=
=20
the subtitles are rendered on to ("pixmap" and "image" would be in the same=
=20
scale as an unscaled video frame and will work with any subtitle format.=20
Another format we should look into is "text" which would allow the=20
application to draw the subtitles manually in whatever obscure form it=20
wants.).

SubtitleWidget in the above code example would be an implementation of your=
=20
widget idea. In this case it would receive the pixmaps and draw them in its=
=20
paintEvent (and use the QPixmap::mask() for transparency). For manual=20
handling of the subtitles a SubtitleOutput class could be provided.

If you have further questions, you can try to find me on IRC (channel #phon=
on,=20
nick Vir). I'm normally online on the afternoon/evening (CET) of workdays.

On Tuesday 25 March 2008, Konrad Materka wrote:
> Hi,
> I sent my proposal on google page, should I send it on techbase too?
> My proposal can be found on this temporary site:
> http://toya.net.pl/~wodka/GSOC/



=2D-=20
________________________________________________________
Matthias Kretz (Germany)                            <><
http://Vir.homelinux.org/
MatthiasKretz@gmx.net, kretz@kde.org,
Matthias.Kretz@urz.uni-heidelberg.de

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