Difference between revisions of "Development/Tutorials/Phonon/Introduction"

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{{Infobox tutorial|time=20 min|distribution=SUSE Linux 11.3|type=Howto|happyreaders=2|unhappyreaders=0}}
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{{Infobox tutorial|time=20 min|distribution=SUSE Linux 11.4|type=Howto|happyreaders=2|unhappyreaders=0}}
  
 
= Introduction =
 
= Introduction =
The following is based on the documentation available [http://www.englishbreakfastnetwork.org/apidocs/apidox-kde-4.0/kdelibs-apidocs/phonon/html/index.html here].
 
 
 
By getting involved with Phonon, you can choose between three different main tasks.
 
By getting involved with Phonon, you can choose between three different main tasks.
* '''Using the Phonon API''', which allows you to develop your own multimedia application. '''Start here.'''
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* '''Using the Phonon API''', which allows you to develop your own multimedia application. '''This is discussed here.'''
  
 
* '''Hacking the Phonon library'''.
 
* '''Hacking the Phonon library'''.
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= Using the phonon API =
 
= Using the phonon API =
The following example is taken from [http://www.englishbreakfastnetwork.org/apidocs/apidox-kde-4.0/kdelibs-apidocs/phonon/html/index.html englishbreakfastnetwork]. It plays /tmp/example.wav. To change the sound device that is used by default, use the command <tt>systemsettings</tt>.
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The following example lets you select a music file and plays it. To change the sound device that is used by default, use the command <tt>systemsettings</tt>.
  
 
== CMakeLists.txt ==
 
== CMakeLists.txt ==
 
You need a file CMakeLists.txt to compile the software later:
 
You need a file CMakeLists.txt to compile the software later:
CMakeLists.txt
 
 
  project (tutorial2)
 
  project (tutorial2)
 
  find_package(KDE4 REQUIRED)
 
  find_package(KDE4 REQUIRED)
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#include <phonon/audiooutput.h>
 
#include <phonon/audiooutput.h>
  
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#include <QFileDialog>
 
#include <QtGui/QApplication>
 
#include <QtGui/QApplication>
 
#include <QtGui/QMainWindow>
 
#include <QtGui/QMainWindow>
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     Phonon::MediaObject* media = new Phonon::MediaObject(this);
 
     Phonon::MediaObject* media = new Phonon::MediaObject(this);
 
     Phonon::createPath(media, new Phonon::AudioOutput(Phonon::MusicCategory, this));
 
     Phonon::createPath(media, new Phonon::AudioOutput(Phonon::MusicCategory, this));
     media->setCurrentSource(QUrl("/tmp/example.wav"));
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     media->setCurrentSource(QFileDialog::getOpenFileName(0,QString("Select a file to play"),QString()));
 
     media->play();
 
     media->play();
 
}
 
}

Revision as of 09:33, 26 September 2011


Tutorial Factbox
Time to replay 20 min
Example Distro SUSE Linux 11.4
Type Howto
Happy readers 2
Unhappy readers 0

Contents

Introduction

By getting involved with Phonon, you can choose between three different main tasks.

  • Using the Phonon API, which allows you to develop your own multimedia application. This is discussed here.
  • Hacking the Phonon library.
  • Writing Phonon backend, this consists in writing interfaces that allows Phonon to use different sound/video engine. This usually requires good skills and knowledge of the engine you interface with.

Using the phonon API

The following example lets you select a music file and plays it. To change the sound device that is used by default, use the command systemsettings.

CMakeLists.txt

You need a file CMakeLists.txt to compile the software later:

project (tutorial2)
find_package(KDE4 REQUIRED)
include (KDE4Defaults)
include_directories(${KDE4_INCLUDES})
set(tutorial1_SRCS main.cpp)
kde4_add_executable(tutorial2 ${tutorial1_SRCS})
target_link_libraries(tutorial2 ${KDE4_KDEUI_LIBS} phonon)
install(TARGETS tutorial2  ${INSTALL_TARGETS_DEFAULT_ARGS})

main.cpp

#include <phonon/mediaobject.h>
#include <phonon/audiooutput.h>

#include <QFileDialog>
#include <QtGui/QApplication>
#include <QtGui/QMainWindow>
#include <QUrl>

class MainWindow : public QMainWindow
{
    Q_OBJECT
    public:
        MainWindow();
};

MainWindow::MainWindow()
{
    Phonon::MediaObject* media = new Phonon::MediaObject(this);
    Phonon::createPath(media, new Phonon::AudioOutput(Phonon::MusicCategory, this));
    media->setCurrentSource(QFileDialog::getOpenFileName(0,QString("Select a file to play"),QString()));
    media->play();
}

int main(int argc, char **argv)
{
    QApplication app(argc, argv);
    QApplication::setApplicationName("Phonon Tutorial 2");
    MainWindow mw;
    mw.show();
    return app.exec();
}

#include "main.moc"

Compile and run it

cmake . && make && ./tutorial2

Getting more help

To talk among phonon experts, point your irc client to the server irc.freenode.org, channel #phonon.

See also


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