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

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m (Make And Run: fix naming)
(The Code: Fix use of deprecated MediaSource constructor.)
 
Line 30: Line 30:
 
     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(QFileDialog::getOpenFileName(0,QString("Select a file to play"),QString()));
+
     media->setCurrentSource(QUrl::fromLocalFile(QFileDialog::getOpenFileName(0,QString("Select a file to play"),QString())));
 
     media->play();
 
     media->play();
 
}
 
}

Latest revision as of 23:46, 23 August 2013

Contents

[edit] 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.

[edit] Abstract

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.

[edit] The Code

All the code we need will be in one file, main.cpp. Create that file with the code below:

#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(QUrl::fromLocalFile(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"

[edit] Build

As usual, we use CMake for build operations:

[edit] CMakeLists.txt

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

project (phonon_tutorial1)
find_package(KDE4 REQUIRED)
include (KDE4Defaults)
include_directories(${KDE4_INCLUDES})
set(phonon_tutorial1_SRCS main.cpp)
kde4_add_executable(phonon_tutorial1 ${phonon_tutorial1_SRCS})
target_link_libraries(phonon_tutorial1 ${KDE4_KDEUI_LIBS} ${PHONON_LIBS})
install(TARGETS phonon_tutorial1  ${INSTALL_TARGETS_DEFAULT_ARGS})

[edit] Make And Run

cmake . && make && ./phonon_tutorial1

[edit] Getting More Help

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

[edit] See Also


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