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. 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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= 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.
  
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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=Abstract=
You can get help on #phonon on irc.freenode.org.
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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>.
----
+
  
= Introduction =
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=The Code=
''Confident Index =0''
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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>
  
The following is based on the documentation available here
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#include <QFileDialog>
[http://www.englishbreakfastnetwork.org/apidocs/apidox-kde-4.0/kdelibs-apidocs/phonon/html/index.html Phonon API].
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#include <QtGui/QApplication>
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#include <QtGui/QMainWindow>
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#include <QUrl>
  
By getting involved with Phonon, you can choose between three different main tasks.
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class MainWindow : public QMainWindow
* '''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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{
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    Q_OBJECT
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    public:
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        MainWindow();
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};
  
* '''Hacking the Phonon library''', (try to develop more this topic).
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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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}
  
* '''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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int main(int argc, char **argv)
 +
{
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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();
 +
    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 ==
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You need a file CMakeLists.txt to compile the software:
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<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>
  
Beginners will probably be more interested by the first task.
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==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 =
 +
To talk among phonon experts, point your irc client to the server irc.freenode.org, channel #phonon.
  
 +
= See Also =
 +
* [[Development/Tutorials/Phonon/Introduction/Python]] - same example in Python
  
 
[[Category:KDE4]]
 
[[Category:KDE4]]
 
[[Category:Phonon]]
 
[[Category:Phonon]]
 +
[[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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