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

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These tutorials are now under construction, please be patient. In order to make the revision process clear, I introduce a confident index, "0" means nobody except me has reviewed the text. I please the reviewers to increment the counter to prove the validity of the tutorials.
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{{Infobox tutorial|time=20 min|distribution=SUSE Linux 11.4|type=Howto|happyreaders=2|unhappyreaders=0}}
  
If you are a Phonon developer and you realize errors, you're missing some details or a whole chapter. Please feel free to complete the followings.
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= Introduction =
You can contact me on #phonon on the irc.freenode.org to give me any feedback, usually I'm using the nickname "lucas" or other variants.
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By getting involved with Phonon, you can choose between three different main tasks.
----
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* '''Using the Phonon API''', which allows you to develop your own multimedia application. '''This is discussed here.'''
  
=Introduction=
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* '''Hacking the Phonon library'''.
''Confident Index =0''
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The following is based on the documentation available here
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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.
[http://www.englishbreakfastnetwork.org/apidocs/apidox-kde-4.0/kdelibs-apidocs/phonon/html/index.html Phonon API].
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By getting involved with Phonon, you can choose between three different main tasks.
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= Using the phonon API =
* '''Using the Phonon API''', which allows you to develop your own multimedia application. In fact any application which needs sound can take benefits from the phonon API. In the tutorials showing the API we will learn how to set up the development environment with kdevelop 3.4.  
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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>.
  
* '''Hacking the Phonon library''', (try to develop more this topic).
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== CMakeLists.txt ==
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You need a file CMakeLists.txt to compile the software later:
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project (tutorial2)
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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(tutorial1_SRCS main.cpp)
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kde4_add_executable(tutorial2 ${tutorial1_SRCS})
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target_link_libraries(tutorial2 ${KDE4_KDEUI_LIBS} phonon)
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install(TARGETS tutorial2  ${INSTALL_TARGETS_DEFAULT_ARGS})
  
* '''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.
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== main.cpp ==
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<pre>
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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(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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</pre>
  
Beginners will probably be more interested by the first task.
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== Compile and run it ==
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cmake . && make && ./tutorial2
  
 +
= Getting more help =
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To talk among phonon experts, point your irc client to the server irc.freenode.org, channel #phonon.
  
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= 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]]

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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