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

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(The Code: Fix use of deprecated MediaSource constructor.)
 
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These tutorials are now under construction, please be patient.
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= Introduction =
=Introduction=
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By getting involved with Phonon, you can choose between three different main tasks.
The following is based on the documentation available here.
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* '''Using the Phonon API''', which allows you to develop your own multimedia application. '''This is discussed here.'''
[http://www.englishbreakfastnetwork.org/apidocs/apidox-kde-4.0/kdelibs-apidocs/phonon/html/index.html Phonon API]
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* '''Hacking the Phonon library'''.
Getting involved with Phonon consists in three different main tasks.
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* '''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''', which allows you to develop your own multimedia application.
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* '''Hacking the Phonon library''' (try to develop more this topic).
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* '''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.
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=Abstract=
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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>.
  
By the way the beginners will probably be interested by the first task.
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=The Code=
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All the code we need will be in one file, <tt>main.cpp</tt>. Create that file with the code below:
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<syntaxhighlight lang="cpp-qt">
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#include <phonon/mediaobject.h>
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#include <phonon/audiooutput.h>
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#include <QFileDialog>
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#include <QtGui/QApplication>
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#include <QtGui/QMainWindow>
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#include <QUrl>
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class MainWindow : public QMainWindow
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{
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    Q_OBJECT
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    public:
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        MainWindow();
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};
 +
 
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MainWindow::MainWindow()
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{
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    Phonon::MediaObject* media = new Phonon::MediaObject(this);
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    Phonon::createPath(media, new Phonon::AudioOutput(Phonon::MusicCategory, this));
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    media->setCurrentSource(QUrl::fromLocalFile(QFileDialog::getOpenFileName(0,QString("Select a file to play"),QString())));
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    media->play();
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}
 +
 
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int main(int argc, char **argv)
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{
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    QApplication app(argc, argv);
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    QApplication::setApplicationName("Phonon Tutorial 2");
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    MainWindow mw;
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    mw.show();
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    return app.exec();
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}
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 +
#include "main.moc"
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</syntaxhighlight>
 +
 
 +
=Build=
 +
As usual, we use CMake for build operations:
 +
 
 +
== CMakeLists.txt ==
 +
You need a file CMakeLists.txt to compile the software:
 +
<syntaxhighlight lang="cmake">
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project (phonon_tutorial1)
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find_package(KDE4 REQUIRED)
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include (KDE4Defaults)
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include_directories(${KDE4_INCLUDES})
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set(phonon_tutorial1_SRCS main.cpp)
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kde4_add_executable(phonon_tutorial1 ${phonon_tutorial1_SRCS})
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target_link_libraries(phonon_tutorial1 ${KDE4_KDEUI_LIBS} ${PHONON_LIBS})
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install(TARGETS phonon_tutorial1  ${INSTALL_TARGETS_DEFAULT_ARGS})
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</syntaxhighlight>
 +
 
 +
==Make And Run==
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<syntaxhighlight lang="bash">
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cmake . && make && ./phonon_tutorial1
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</syntaxhighlight>
 +
 
 +
= Getting More Help =
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To talk among phonon experts, point your irc client to the server irc.freenode.org, channel #phonon.
 +
 
 +
= See Also =
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* [[Development/Tutorials/Phonon/Introduction/Python]] - same example in Python
  
 
[[Category:KDE4]]
 
[[Category:KDE4]]
 
[[Category:Phonon]]
 
[[Category:Phonon]]
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[[Category:Tutorial]]

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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