Phonon: Difference between revisions

    From KDE TechBase
    (removed Tutorial Factbox: not very common at current tutorials. sections rearranged based on Hello World example)
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    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();
    }
    }
    Line 52: Line 52:
    You need a file CMakeLists.txt to compile the software:
    You need a file CMakeLists.txt to compile the software:
    <syntaxhighlight lang="cmake">
    <syntaxhighlight lang="cmake">
    project (tutorial2)
    project (phonon_tutorial1)
    find_package(KDE4 REQUIRED)
    find_package(KDE4 REQUIRED)
    include (KDE4Defaults)
    include (KDE4Defaults)
    include_directories(${KDE4_INCLUDES})
    include_directories(${KDE4_INCLUDES})
    set(tutorial1_SRCS main.cpp)
    set(phonon_tutorial1_SRCS main.cpp)
    kde4_add_executable(tutorial2 ${tutorial1_SRCS})
    kde4_add_executable(phonon_tutorial1 ${phonon_tutorial1_SRCS})
    target_link_libraries(tutorial2 ${KDE4_KDEUI_LIBS} phonon)
    target_link_libraries(phonon_tutorial1 ${KDE4_KDEUI_LIBS} ${PHONON_LIBS})
    install(TARGETS tutorial2 ${INSTALL_TARGETS_DEFAULT_ARGS})
    install(TARGETS phonon_tutorial1 ${INSTALL_TARGETS_DEFAULT_ARGS})
    </syntaxhighlight>
    </syntaxhighlight>


    ==Make And Run==
    ==Make And Run==
    <syntaxhighlight lang="bash">
    <syntaxhighlight lang="bash">
    cmake . && make && ./tutorial2
    cmake . && make && ./phonon_tutorial1
    </syntaxhighlight>
    </syntaxhighlight>


    Line 71: Line 71:


    = See Also =
    = See Also =
    * [[Development/Tutorials/Phonon/Introduction/Python]] - same example in Python
    * [[/Python]] - same example in Python
     
    [[Category:KDE4]]
    [[Category:Phonon]]
    [[Category:Tutorial]]

    Revision as of 19:20, 11 March 2016

    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.

    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.

    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"
    

    Build

    As usual, we use CMake for build operations:

    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})
    

    Make And Run

    cmake . && make && ./phonon_tutorial1
    

    Getting More Help

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

    See Also