Difference between revisions of "Phonon"

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{{Infobox tutorial|time=20 min|distribution=SUSE Linux 11.4|type=Howto|happyreaders=2|unhappyreaders=0}}
 
 
 
= Introduction =
 
= Introduction =
 
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. '''This is discussed here.'''
 
* '''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'''.
 
 
* '''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.
  
= Using the phonon API =
+
=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>.
 
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>.
  
== CMakeLists.txt ==
+
=The Code=
You need a file CMakeLists.txt to compile the software later:
+
All the code we need will be in one file, <tt>main.cpp</tt>. Create that file with the code below:
project (tutorial2)
+
<syntaxhighlight lang="cpp-qt">
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 ==
+
<pre>
+
 
#include <phonon/mediaobject.h>
 
#include <phonon/mediaobject.h>
 
#include <phonon/audiooutput.h>
 
#include <phonon/audiooutput.h>
Line 44: 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 58: Line 44:
  
 
#include "main.moc"
 
#include "main.moc"
</pre>
+
</syntaxhighlight>
  
== Compile and run it ==
+
=Build=
cmake . && make && ./tutorial2
+
As usual, we use CMake for build operations:
  
= Getting more help =
+
== CMakeLists.txt ==
To talk among phonon experts, point your irc client to the server irc.freenode.org, channel #phonon.
+
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>
  
= See also =
+
==Make And Run==
* [[Development/Tutorials/Phonon/Introduction/Python]] - same example in Python
+
<syntaxhighlight lang="bash">
 +
cmake . && make && ./phonon_tutorial1
 +
</syntaxhighlight>
 +
 
 +
= Getting More Help =
 +
To talk among phonon experts, point your irc client to the server irc.freenode.org, channel #phonon.
  
[[Category:KDE4]]
+
= See Also =
[[Category:Phonon]]
+
* [[/Python]] - same example in Python
[[Category:Tutorial]]
+

Latest 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


This page was last modified on 11 March 2016, at 19:20. Content is available under Creative Commons License SA 3.0 as well as the GNU Free Documentation License 1.2 unless otherwise noted.