Difference between revisions of "LibVLC SampleCode Qt"
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This sample code will render a video into a Qt QWidget. | This sample code will render a video into a Qt QWidget. | ||
− | This was tested with vlc-0.9.9 and Qt 4.5.1 on WinXP | + | This was tested with vlc-0.9.9 and Qt 4.5.1 on WinXP and Linux |
+ | == How to use? == | ||
+ | |||
+ | Take those 3 files, put them in a folder. | ||
+ | Run | ||
+ | qmake -project | ||
+ | |||
+ | Edit the .pro file and add | ||
+ | LIBS += -lvlc | ||
+ | |||
+ | Run | ||
+ | make | ||
+ | |||
+ | |||
+ | |||
+ | == Files == | ||
main.cpp: | main.cpp: |
Revision as of 08:14, 23 May 2009
This sample code will render a video into a Qt QWidget.
This was tested with vlc-0.9.9 and Qt 4.5.1 on WinXP and Linux
How to use?
Take those 3 files, put them in a folder. Run
qmake -project
Edit the .pro file and add
LIBS += -lvlc
Run
make
Files
main.cpp:
/* libVLC and Qt sample code * Copyright © 2009 Alexander Maringer <maringer@maringer-it.de> */ #include "vlc_on_qt.h" #include <QtGui/QApplication> int main(int argc, char *argv[]) { QApplication a(argc, argv); Player p; p.resize(640,480); p.playFile("rtp://@:2626"); p.show(); return a.exec(); }
vlc_on_qt.h:
/* libVLC and Qt sample code * Copyright © 2009 Alexander Maringer <maringer@maringer-it.de> */ #ifndef VLC_ON_QT_H #define VLC_ON_QT_H #include <vlc/vlc.h> #include <QWidget> class QProcess; class QVBoxLayout; class QWidget; class QSizePolicy; class QPushButton; class QTextEdit; class QCloseEvent; class QTimer; class QDebug; class QFrame; class QSlider; #define POSITION_RESOLUTION 10000 class Player : public QWidget { Q_OBJECT QSlider *_positionSlider; QSlider *_volumeSlider; QFrame *_videoWidget; QTimer *poller; bool _isPlaying; libvlc_exception_t _vlcexcep; libvlc_instance_t *_vlcinstance; libvlc_media_player_t *_mp; libvlc_media_t *_m; libvlc_media_list_t *_ml; libvlc_media_list_player_t * _mlp; public: Player(); ~Player(); void raise(libvlc_exception_t * ex); public slots: void playFile(QString file); void updateInterface(); void changeVolume(int newVolume); void changePosition(int newPosition); }; #endif
vlc_on_qt.cpp:
/* libVLC and Qt sample code * Copyright © 2009 Alexander Maringer <maringer@maringer-it.de> */ #include "vlc_on_qt.h" #include <QVBoxLayout> #include <QWidget> #include <QSizePolicy> #include <QPushButton> #include <QTextEdit> #include <QSlider> #include <QCloseEvent> #include <QTimer> #include <QDebug> Player::Player() : QWidget() { //preparation of the vlc command const char * const vlc_args[] = { "-I", "dummy", /* Don't use any interface */ "--ignore-config", /* Don't use VLC's config */ "--extraintf=logger", //log anything "--verbose=2", //be much more verbose then normal for debugging purpose "--plugin-path=C:\\vlc-0.9.9-win32\\plugins\\" }; _videoWidget=new QFrame(this); _volumeSlider=new QSlider(Qt::Horizontal,this); _volumeSlider->setMaximum(100); //the volume is between 0 and 100 _volumeSlider->setToolTip("Audio slider"); // Note: if you use streaming, there is no ability to use the position slider _positionSlider=new QSlider(Qt::Horizontal,this); _positionSlider->setMaximum(POSITION_RESOLUTION); QVBoxLayout *layout = new QVBoxLayout; layout->addWidget(_videoWidget); layout->addWidget(_positionSlider); layout->addWidget(_volumeSlider); setLayout(layout); _isPlaying=false; poller=new QTimer(this); //Initialize an instance of vlc //a structure for the exception is neede for this initalization libvlc_exception_init(&_vlcexcep); //create a new libvlc instance _vlcinstance=libvlc_new(sizeof(vlc_args) / sizeof(vlc_args[0]), vlc_args,&_vlcexcep); //tricky calculation of the char space used raise (&_vlcexcep); // Create a media player playing environement _mp = libvlc_media_player_new (_vlcinstance, &_vlcexcep); raise (&_vlcexcep); //connect the two sliders to the corresponding slots (uses Qt's signal / slots technology) connect(poller, SIGNAL(timeout()), this, SLOT(updateInterface())); connect(_positionSlider, SIGNAL(sliderMoved(int)), this, SLOT(changePosition(int))); connect(_volumeSlider, SIGNAL(sliderMoved(int)), this, SLOT(changeVolume(int))); poller->start(100); //start timer to trigger every 100 ms the updateInterface slot } //desctructor Player::~Player(){} void Player::playFile(QString file) { //the file has to be in one of the following formats /perhaps a little bit outdated) /* [file://]filename Plain media file http://ip:port/file HTTP URL ftp://ip:port/file FTP URL mms://ip:port/file MMS URL screen:// Screen capture [dvd://][device][@raw_device] DVD device [vcd://][device] VCD device [cdda://][device] Audio CD device udp:[[<source address>]@[<bind address>][:<bind port>]] */ /* Create a new LibVLC media descriptor */ _m = libvlc_media_new (_vlcinstance, file.toAscii(), &_vlcexcep); raise(&_vlcexcep); libvlc_media_player_set_media (_mp, _m, &_vlcexcep); raise(&_vlcexcep); // /!\ Please note /!\ // // passing the widget to the lib shows vlc at which position it should show up // vlc automatically resizes the video to the ´given size of the widget // and it even resizes it, if the size changes at the playing /* Get our media instance to use our window */ #ifdef Q_OS_WIN libvlc_media_player_set_drawable( _mp, reinterpret_cast<unsigned int>(_videoWidget->winId()), &_vlcexcep ); #else libvlc_media_player_set_drawable( _mp, _videoWidget->winId(), &_vlcexcep ); #endif raise(&_vlcexcep); /* Play */ libvlc_media_player_play (_mp, &_vlcexcep ); raise(&_vlcexcep); _isPlaying=true; } void Player::changeVolume(int newVolume) { libvlc_exception_clear(&_vlcexcep); libvlc_audio_set_volume (_vlcinstance,newVolume , &_vlcexcep); raise(&_vlcexcep); } void Player::changePosition(int newPosition) { libvlc_exception_clear(&_vlcexcep); // It's possible, that the vlc doesn't play anything // so check before libvlc_media_t *curMedia = libvlc_media_player_get_media (_mp, &_vlcexcep); libvlc_exception_clear(&_vlcexcep); if (curMedia == NULL) return; float pos=(newPosition)/POSITION_RESOLUTION; libvlc_media_player_set_position (_mp, pos, &_vlcexcep); raise(&_vlcexcep); } void Player::updateInterface() { if(!_isPlaying) return; // It's possible, that the vlc doesn't play anything // so check before libvlc_media_t *curMedia = libvlc_media_player_get_media (_mp, &_vlcexcep); libvlc_exception_clear(&_vlcexcep); if (curMedia == NULL) return; float pos=libvlc_media_player_get_position (_mp, &_vlcexcep); int siderPos=(int)(pos*(float)(POSITION_RESOLUTION)); _positionSlider->setValue(siderPos); int volume=libvlc_audio_get_volume (_vlcinstance,&_vlcexcep); _volumeSlider->setValue(volume); } void Player::raise(libvlc_exception_t * ex) { if (libvlc_exception_raised (ex)) { fprintf (stderr, "error: %s\n", libvlc_exception_get_message(ex)); exit (-1); } }