Phonon: how to know

[Tanguy Krotoff]

I just found it :p
class Backend {
	bool connectNodes(QObject * source, QObject * sink);
	bool disconnectNodes(QObject * source, QObject * sink);
}

There are some stuffs that I still don't understand about Phonon :/
I checked Xine backend source code about connection between MediaNode,
I don't get it, the code seems to be very generic.

For the moment I do this:
bool Backend::connectNodes(QObject * source, QObject * sink) {
	qDebug() << __FUNCTION__ << source->metaObject()->className() << ""
<< sink->metaObject()->className();

	//Example:
	//source = Phonon::VLC_MPlayer::MediaObject (inherits Phonon::MediaNode)
	//sink = Phonon::VLC_MPlayer::VideoWidget (inherits Phonon::MediaNode)
	VideoWidget * videoWidget = qobject_cast<VideoWidget *>(sink);
	if (videoWidget) {
		//We have a VideoWidget
		MediaObject * mediaObject = qobject_cast<MediaObject *>(source);
		if (mediaObject) {
			//Connects the VideoWidget to a MediaObject
			videoWidget->connectToMediaObject(mediaObject);
			return true;
		}
	}

	//Example:
	//source = Phonon::VLC_MPlayer::MediaObject (inherits Phonon::MediaNode)
	//sink = Phonon::VLC_MPlayer::AudioOutput (inherits Phonon::MediaNode)
	AudioOutput * audioOutput = qobject_cast<AudioOutput *>(sink);
	else if (audioOutput) {
		//We have a AudioOutput
		MediaObject * mediaObject = qobject_cast<MediaObject *>(source);
		if (mediaObject) {
			//Connects the AudioOutput to a MediaObject
			audioOutput->connectToMediaObject(mediaObject);
			return true;
		}
	}

	qWarning() << __FUNCTION__ << "Connection not supported";
	return false;
}


I guess it is not the right way to do it, I will improve it and make
it more generic as I understand better how works Phonon.


Where can I find some tests examples (i.e some unit test that uses
QTest or something)?

For now I've coded my own GUI examples:
http://code.google.com/p/phonon-vlc-mplayer/source/browse/trunk/tests/
These tests examples only depend on Qt-4.4 as I want my Phonon
backends to be able to work with simple Qt apps + I want to test my
code under Windows and it is easier to test it without depending on
KDE.


On Thu, Apr 10, 2008 at 6:51 PM, Ian Monroe <ian at monroe.nu> wrote:
>
> On 4/10/08, Tanguy Krotoff <tkrotoff at gmail.com> wrote:
>  > Hi everybody
>  >
>  > Still coding on VLC & MPlayer backends...
>  >
>  > Here is a question:
>  > A MediaObject can be linked with a VideoWidget via Path.
>  > Inside my backend implementation, I would like to retrieve the
>  > VideoWidget associated with the MediaObject, how can I do that?
>  >
>  > Explanation:
>  > I want to access the right VideoWidget from MediaObject since I need
>  > VideoWidget Window ID inside MediaObject::play() (as VLC & MPlayer
>  > need it to render the video).
>  >
>  > Currently I'm relying on a simple static variable containing the
>  > Window ID of the last VideoWidget created and this approach leads to
>  > some bugs.
>  >
>  > Thx
>
>  I've only done a tiny bit of backend stuff, so I'm no expert. But
>  initutively this sounds like something the backend needs to keep track
>  of.
>
>  Ian
>  _______________________________________________
>  kde-multimedia mailing list
>  kde-multimedia at kde.org
>  https://mail.kde.org/mailman/listinfo/kde-multimedia
>



-- 
Tanguy Krotoff <tkrotoff at gmail.com>
+33 6 68 42 70 24