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/* This file is part of the KDE project
Copyright (C) 2004 Matthias Kretz <kretz@kde.org>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License version 2 as published by the Free Software Foundation.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
#ifndef KDEMM_FACTORY_H
#define KDEMM_FACTORY_H
#include <kurl.h>
#include <kdemm/channel.h>
#include <tqstring.h>
#include <tqstringlist.h>
#include <dcopobject.h>
namespace KDE
{
/**
* \brief The KDE Multimedia classes
*
* In this Namespace you find a few classes to access Multimedia functions like
* playing audio files and simple video playing. Those classes are not dependent
* on any specific framework (like they were in pre KDE4 times) but rather use
* exchangeable backends to do the "dirty" work.
*
* If you want to write a new backend you also find the necessary classes in
* this namespace.
*
* \since 4.0
*/
namespace Multimedia
{
class Backend;
class Player;
class VideoPlayer;
/**
* \brief Factory to access the preferred Backend.
*
* This class is your entry point to KDE Multimedia usage. It provides the
* necessary objects for playing audio and video.
*
* For simple access to just playing an audio file see SimplePlayer.
*
* \remarks
* Extensions to the existing functionality can either be added by using the
* reserved virtual functions in Backend or by adding a new interface e.g.
* BackendV2 and creating a BackendV2 instance when the Backend instance is
* created.
*
* \author Matthias Kretz <kretz@kde.org>
* \since 4.0
*/
class KDE_EXPORT Factory : public TQObject, public DCOPObject
{
Q_OBJECT
public:
/**
* Returns a pointer to the factory.
* Use this function to get an instance of KLibLoader.
*
* @return a pointer to the loader. If no loader exists until now then
* one is created
*/
static Factory * self();
/**
* Create a new Player.
*
* You need to call it like this:
* \code
* Factory::self()->createPlayer();
* \endcode
*
* @return a pointer to the Player the backend provides
*/
Player * createPlayer();
/**
* Create a new VideoPlayer object. The Backend does not have to
* implement this functionality so you have to check that it didn't
* return 0.
*
* @return A new instance to a VideoPlayer from the Backend. Or 0 if
* the Backend does not support the VideoPlayer interface.
*/
VideoPlayer * createVideoPlayer();
/**
* Play the specified sound-file with no further control. Returns
* immediatly.
*
* @return if the file was be succesfully issued, but is not a
* garantie for succes of playing the entire file.
*/
bool playSoundEvent(const KURL & url);
/**
* Creates a new Channel object that you can use for a Player object to
* play to.
*
* \param title A user visible title for the Channel. Most of the time
* you will use the application's name.
*
* \param channeltype \ref availableChannels() returns a list of strings
* where you can choose one to be used. Most of the time you will use
* the "default" channel. But the Backend could also provide special
* purpose channels like one for notifications, one for previews and one
* for media playback.
*
* \param direction Whether it's a Channel::Input or Channel::Output
* that you're requesting.
*
* \returns Returns a Channel object or 0 if your request couldn't be
* fullfilled.
*/
Channel * createChannel( const TQString & title,
const TQString & channeltype = TQString::fromLatin1( "default" ),
Channel::Direction direction = Channel::Output );
/**
* Returns the names of the channels that can be used to play or record,
* depending on the value of \p direction.
*
* \param direction If set to Channel::Output you will get the names of
* all output channels, if set to Channel::Input you get the same for
* the input channels.
*/
TQStringList availableChannels( Channel::Direction direction = Channel::Output ) const;
/**
* Returns the mimetypes that can be played.
*/
TQStringList playableMimeTypes() const;
/**
* Checks whether a certain mimetype is playable.
*/
bool isMimeTypePlayable( const TQString & mimetype ) const;
/**
* Get the name of the Backend. It's the name from the .desktop file.
*/
TQString backendName() const;
/**
* Get the comment of the Backend. It's the comment from the .desktop file.
*/
TQString backendComment() const;
/**
* Get the version of the Backend. It's the version from the .desktop file.
*
* The version is especially interesting if there are several versions
* available for binary incompatible versions of the backend's media
* framework.
*/
TQString backendVersion() const;
/**
* Get the icon (name) of the Backend. It's the icon from the .desktop file.
*/
TQString backendIcon() const;
/**
* Get the website of the Backend. It's the website from the .desktop file.
*/
TQString backendWebsite() const;
signals:
/**
* This signal is emitted when the user changes the backend. You then
* have to free all your references to Player or Channel objects.
*/
void deleteYourObjects();
/**
* After you got a deleteYourObjects() signal the backend is changed
* internally. Then you will receive this signal, and only then should
* you reconstruct all your objects again. This time they will
* internally use the new backend.
*/
void recreateObjects();
protected:
Factory();
~Factory();
private slots:
void objectDestroyed( TQObject * );
private:
static Factory * m_self;
class Private;
Private * d;
K_DCOP
k_dcop:
/**
* \internal
* This is called via DCOP when the user changes the KDEMM Backend.
*/
void kdemmBackendChanged();
};
}} // namespaces
#endif // BACKENDFACTORY_H
// vim: sw=4 ts=4 tw=80 noet
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