Phonon: Difference between revisions
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{{Infobox tutorial|time=20 min|distribution=SUSE Linux 11. | {{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. | * '''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 = | = Using the phonon API = | ||
The following example | 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 == | == CMakeLists.txt == | ||
You need a file CMakeLists.txt to compile the software later: | You need a file CMakeLists.txt to compile the software later: | ||
project (tutorial2) | project (tutorial2) | ||
find_package(KDE4 REQUIRED) | find_package(KDE4 REQUIRED) | ||
include (KDE4Defaults) | include (KDE4Defaults) | ||
include_directories(${KDE4_INCLUDES}) | include_directories(${KDE4_INCLUDES}) | ||
set(tutorial1_SRCS | set(tutorial1_SRCS main.cpp) | ||
kde4_add_executable(tutorial2 ${tutorial1_SRCS}) | kde4_add_executable(tutorial2 ${tutorial1_SRCS}) | ||
target_link_libraries(tutorial2 ${KDE4_KDEUI_LIBS} phonon) | target_link_libraries(tutorial2 ${KDE4_KDEUI_LIBS} phonon) | ||
install(TARGETS tutorial2 ${INSTALL_TARGETS_DEFAULT_ARGS}) | install(TARGETS tutorial2 ${INSTALL_TARGETS_DEFAULT_ARGS}) | ||
== | == main.cpp == | ||
<pre> | <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 43: | ||
{ | { | ||
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( | media->setCurrentSource(QFileDialog::getOpenFileName(0,QString("Select a file to play"),QString())); | ||
media->play(); | media->play(); | ||
} | } | ||
Line 64: | Line 57: | ||
} | } | ||
#include " | #include "main.moc" | ||
</pre> | </pre> | ||
== Compile and run it == | == Compile and run it == | ||
cmake . && make && ./tutorial2 | 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 = | = See also = |
Revision as of 08:33, 26 September 2011
Time to replay | 20 min |
Example Distro | SUSE Linux 11.4 |
Type | Howto |
Happy readers | 2 |
Unhappy readers | 0 |
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
- Development/Tutorials/Phonon/Introduction/Python - same example in Python