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}}
 
 
You can get help on #phonon on irc.freenode.org.
 
 
 
= Introduction =
 
= Introduction =
The following is based on the documentation available here
 
[http://www.englishbreakfastnetwork.org/apidocs/apidox-kde-4.0/kdelibs-apidocs/phonon/html/index.html Phonon API].
 
 
 
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. 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.  
+
* '''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''', (try to develop more this topic).
+
 
+
 
* '''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.
 
* '''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.
  
Beginners will probably be more interested by the first task.
+
=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 <tt>systemsettings</tt>.
  
= Using the phonon API =
+
=The Code=
The following example is taken from http://www.englishbreakfastnetwork.org/apidocs/apidox-kde-4.0/kdelibs-apidocs/phonon/html/index.html. It plays /tmp/example.wav. To change the sound device that is used by default, use the command <tt>systemsettings</tt>.
+
All the code we need will be in one file, <tt>main.cpp</tt>. Create that file with the code below:
 
+
<syntaxhighlight lang="cpp-qt">
== CMakeLists.txt ==
+
You need a file CMakeLists.txt to compile the software later:
+
CMakeLists.txt
+
project (tutorial2)
+
find_package(KDE4 REQUIRED)
+
include (KDE4Defaults)
+
include_directories(${KDE4_INCLUDES})
+
set(tutorial1_SRCS tutorial2.cpp)
+
kde4_add_executable(tutorial2 ${tutorial1_SRCS})
+
target_link_libraries(tutorial2 ${KDE4_KDEUI_LIBS} phonon)
+
install(TARGETS tutorial2  ${INSTALL_TARGETS_DEFAULT_ARGS})
+
 
+
== tutorial2.cpp ==
+
<pre>
+
 
#include <phonon/mediaobject.h>
 
#include <phonon/mediaobject.h>
 
#include <phonon/audiooutput.h>
 
#include <phonon/audiooutput.h>
  
 +
#include <QFileDialog>
 
#include <QtGui/QApplication>
 
#include <QtGui/QApplication>
 
#include <QtGui/QMainWindow>
 
#include <QtGui/QMainWindow>
Line 50: Line 29:
 
{
 
{
 
     Phonon::MediaObject* media = new Phonon::MediaObject(this);
 
     Phonon::MediaObject* media = new Phonon::MediaObject(this);
     createPath(media, new Phonon::AudioOutput(Phonon::MusicCategory, this));
+
     Phonon::createPath(media, new Phonon::AudioOutput(Phonon::MusicCategory, this));
     media->setCurrentSource(QUrl("/tmp/example.wav"));
+
     media->setCurrentSource(QFileDialog::getOpenFileName(0,QString("Select a file to play"),QString()));
 
     media->play();
 
     media->play();
 
}
 
}
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}
 
}
  
#include "tutorial2.moc"
+
#include "main.moc"
</pre>
+
</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">
 +
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})
 +
</syntaxhighlight>
 +
 
 +
==Make And Run==
 +
<syntaxhighlight lang="bash">
 +
cmake . && make && ./phonon_tutorial1
 +
</syntaxhighlight>
  
== Compile and run it ==
+
= Getting More Help =
cmake . && make && ./tutorial2
+
To talk among phonon experts, point your irc client to the server irc.freenode.org, channel #phonon.
  
= See also =
+
= See Also =
 
* [[Development/Tutorials/Phonon/Introduction/Python]] - same example in Python
 
* [[Development/Tutorials/Phonon/Introduction/Python]] - same example in Python
  

Revision as of 00:16, 11 May 2013

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.

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(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


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