Difference between revisions of "LibVLC SampleCode Qt"
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+ | {{Lowercase}} | ||
+ | {{Example code|for=libVLC}} | ||
+ | {{Outdated}} | ||
+ | |||
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 |
+ | |||
+ | This was tested with vlc-1.1.9 and Qt 4.7.2 and Ubuntu 11.04 | ||
+ | |||
+ | == How to use? == | ||
+ | |||
+ | |||
+ | You need [[LibVLC|''libvlc headers'']] and ''Qt headers''.Take those 3 files, put them in a folder. | ||
+ | Run | ||
+ | qmake -project | ||
+ | |||
+ | Edit the .pro file and add | ||
+ | LIBS += -L*path to vlc lib* #if you are at windows os | ||
+ | LIBS += -lvlc | ||
+ | |||
+ | Run | ||
+ | qmake | ||
+ | and then | ||
+ | make or mingw32-make under a Windows OS | ||
+ | |||
+ | |||
+ | On win os you have to use the zip file. the lib and the header files are located in the sdk-folder. | ||
+ | |||
+ | == Notes == | ||
+ | |||
+ | Depending on your distribution and the way you install Qt and Vlc it may be a good idea to reset the vlc's module cache: | ||
+ | sudo /usr/lib/vlc/vlc-cache-gen -f /usr/lib/vlc/plugins/ | ||
+ | or: | ||
+ | vlc --reset-plugins-cache | ||
+ | == VLC 1.1.5 and Ubuntu Lucid == | ||
+ | [Rafael Capucho<rafael.capucho@gmail.com> 20120713] Modified to include properly QX11EmbedContainer header that was missing.- tested ok | ||
+ | |||
+ | [Ondrej Spilka 20101201] slightly modified for the modest versions... | ||
+ | - X11 embed container have to be used, therefore QX11EmbedContainer rather than QFrame have to be used.- tested ok | ||
+ | |||
+ | |||
+ | == Files == | ||
main.cpp: | main.cpp: | ||
− | < | + | <syntaxhighlight lang="cpp-qt"> |
/* libVLC and Qt sample code | /* libVLC and Qt sample code | ||
* Copyright © 2009 Alexander Maringer <maringer@maringer-it.de> | * Copyright © 2009 Alexander Maringer <maringer@maringer-it.de> | ||
Line 18: | Line 58: | ||
Player p; | Player p; | ||
p.resize(640,480); | p.resize(640,480); | ||
− | p.playFile("rtp://@:2626"); | + | p.playFile("rtp://@:2626"); // Replace with what you want to play |
p.show(); | p.show(); | ||
return a.exec(); | return a.exec(); | ||
} | } | ||
− | </ | + | </syntaxhighlight> |
vlc_on_qt.h: | vlc_on_qt.h: | ||
− | < | + | <syntaxhighlight lang="cpp-qt"> |
/* libVLC and Qt sample code | /* libVLC and Qt sample code | ||
* Copyright © 2009 Alexander Maringer <maringer@maringer-it.de> | * Copyright © 2009 Alexander Maringer <maringer@maringer-it.de> | ||
Line 36: | Line 76: | ||
#include <QWidget> | #include <QWidget> | ||
+ | #include <QX11EmbedContainer> | ||
− | |||
class QVBoxLayout; | class QVBoxLayout; | ||
− | |||
− | |||
class QPushButton; | class QPushButton; | ||
− | |||
− | |||
class QTimer; | class QTimer; | ||
− | |||
class QFrame; | class QFrame; | ||
class QSlider; | class QSlider; | ||
Line 56: | Line 91: | ||
QSlider *_positionSlider; | QSlider *_positionSlider; | ||
QSlider *_volumeSlider; | QSlider *_volumeSlider; | ||
+ | // [20101201 Ondra Spilka] | ||
+ | // on Linux/Ubuntu Lucid and VLC >= 1.0 (at least 1.1.5 was tested) XWindow handle have to be passed | ||
+ | // therefore QX11EmbedContainer have to be used instead of QFrame | ||
+ | #ifdef Q_WS_X11 | ||
+ | QX11EmbedContainer *_videoWidget; | ||
+ | #else | ||
QFrame *_videoWidget; | QFrame *_videoWidget; | ||
+ | #endif | ||
QTimer *poller; | QTimer *poller; | ||
bool _isPlaying; | bool _isPlaying; | ||
Line 63: | Line 105: | ||
libvlc_media_player_t *_mp; | libvlc_media_player_t *_mp; | ||
libvlc_media_t *_m; | libvlc_media_t *_m; | ||
− | |||
− | |||
public: | public: | ||
Line 79: | Line 119: | ||
}; | }; | ||
#endif | #endif | ||
− | </ | + | </syntaxhighlight> |
vlc_on_qt.cpp: | vlc_on_qt.cpp: | ||
− | < | + | <syntaxhighlight lang="cpp-qt"> |
/* libVLC and Qt sample code | /* libVLC and Qt sample code | ||
* Copyright © 2009 Alexander Maringer <maringer@maringer-it.de> | * Copyright © 2009 Alexander Maringer <maringer@maringer-it.de> | ||
Line 89: | Line 129: | ||
#include "vlc_on_qt.h" | #include "vlc_on_qt.h" | ||
+ | #include <QX11EmbedContainer> | ||
#include <QVBoxLayout> | #include <QVBoxLayout> | ||
− | |||
− | |||
#include <QPushButton> | #include <QPushButton> | ||
− | |||
#include <QSlider> | #include <QSlider> | ||
− | |||
#include <QTimer> | #include <QTimer> | ||
− | #include < | + | #include <QFrame> |
Player::Player() | Player::Player() | ||
: QWidget() | : QWidget() | ||
{ | { | ||
− | // | + | //preparation of the vlc command |
const char * const vlc_args[] = { | const char * const vlc_args[] = { | ||
− | |||
− | |||
− | |||
"--verbose=2", //be much more verbose then normal for debugging purpose | "--verbose=2", //be much more verbose then normal for debugging purpose | ||
"--plugin-path=C:\\vlc-0.9.9-win32\\plugins\\" }; | "--plugin-path=C:\\vlc-0.9.9-win32\\plugins\\" }; | ||
+ | #ifdef Q_WS_X11 | ||
+ | _videoWidget=new QX11EmbedContainer(this); | ||
+ | #else | ||
_videoWidget=new QFrame(this); | _videoWidget=new QFrame(this); | ||
+ | #endif | ||
_volumeSlider=new QSlider(Qt::Horizontal,this); | _volumeSlider=new QSlider(Qt::Horizontal,this); | ||
Line 150: | Line 188: | ||
//desctructor | //desctructor | ||
− | Player::~Player(){} | + | Player::~Player() |
+ | { | ||
+ | /* Stop playing */ | ||
+ | libvlc_media_player_stop (_mp, &_vlcexcep); | ||
+ | |||
+ | /* Free the media_player */ | ||
+ | libvlc_media_player_release (_mp); | ||
+ | |||
+ | libvlc_release (_vlcinstance); | ||
+ | raise (&_vlcexcep); | ||
+ | } | ||
void Player::playFile(QString file) | void Player::playFile(QString file) | ||
Line 181: | Line 229: | ||
/* Get our media instance to use our window */ | /* Get our media instance to use our window */ | ||
− | libvlc_media_player_set_drawable( _mp, reinterpret_cast<unsigned int>(_videoWidget->winId()), &_vlcexcep ); | + | #if defined(Q_OS_WIN) |
+ | libvlc_media_player_set_drawable(_mp, reinterpret_cast<unsigned int>(_videoWidget->winId()), &_vlcexcep ); | ||
+ | //libvlc_media_player_set_hwnd(_mp, _videoWidget->winId(), &_vlcexcep ); // for vlc 1.0 | ||
+ | #elif defined(Q_OS_MAC) | ||
+ | libvlc_media_player_set_drawable(_mp, _videoWidget->winId(), &_vlcexcep ); | ||
+ | //libvlc_media_player_set_agl (_mp, _videoWidget->winId(), &_vlcexcep); // for vlc 1.0 | ||
+ | #else //Linux | ||
+ | //[20101201 Ondrej Spilka] obsolete call on libVLC >=1.1.5 | ||
+ | //libvlc_media_player_set_drawable(_mp, _videoWidget->winId(), &_vlcexcep ); | ||
+ | //libvlc_media_player_set_xwindow(_mp, _videoWidget->winId(), &_vlcexcep ); // for vlc 1.0 | ||
+ | |||
+ | /* again note X11 handle on Linux is needed | ||
+ | winID() returns X11 handle when QX11EmbedContainer us used */ | ||
+ | |||
+ | int windid = _videoWidget->winId(); | ||
+ | libvlc_media_player_set_xwindow (mp, windid ); | ||
+ | |||
+ | #endif | ||
raise(&_vlcexcep); | raise(&_vlcexcep); | ||
Line 201: | Line 266: | ||
{ | { | ||
libvlc_exception_clear(&_vlcexcep); | libvlc_exception_clear(&_vlcexcep); | ||
− | // It's possible | + | // It's possible that the vlc doesn't play anything |
// so check before | // so check before | ||
libvlc_media_t *curMedia = libvlc_media_player_get_media (_mp, &_vlcexcep); | libvlc_media_t *curMedia = libvlc_media_player_get_media (_mp, &_vlcexcep); | ||
Line 208: | Line 273: | ||
return; | return; | ||
− | float pos=(newPosition)/POSITION_RESOLUTION; | + | float pos=(float)(newPosition)/(float)POSITION_RESOLUTION; |
libvlc_media_player_set_position (_mp, pos, &_vlcexcep); | libvlc_media_player_set_position (_mp, pos, &_vlcexcep); | ||
raise(&_vlcexcep); | raise(&_vlcexcep); | ||
Line 218: | Line 283: | ||
return; | return; | ||
− | // It's possible | + | // It's possible that the vlc doesn't play anything |
// so check before | // so check before | ||
libvlc_media_t *curMedia = libvlc_media_player_get_media (_mp, &_vlcexcep); | libvlc_media_t *curMedia = libvlc_media_player_get_media (_mp, &_vlcexcep); | ||
Line 225: | Line 290: | ||
return; | return; | ||
− | |||
− | |||
− | |||
− | |||
float pos=libvlc_media_player_get_position (_mp, &_vlcexcep); | float pos=libvlc_media_player_get_position (_mp, &_vlcexcep); | ||
int siderPos=(int)(pos*(float)(POSITION_RESOLUTION)); | int siderPos=(int)(pos*(float)(POSITION_RESOLUTION)); | ||
Line 243: | Line 304: | ||
} | } | ||
} | } | ||
− | </ | + | </syntaxhighlight> |
+ | |||
+ | == VLC 1.2 and OpenSuse 11.3 == | ||
+ | [Rafael Capucho<rafael.capucho@gmail.com> 20120713] Modified to include properly QX11EmbedContainer header that was missing.- tested ok | ||
+ | |||
+ | [Jofre Guevara 20101215] Modifications of original template based on new VLC version. | ||
+ | |||
+ | [Ondrej Spilka 20101201] slightly modified for the modest versions... | ||
+ | |||
+ | == Files == | ||
+ | |||
+ | main.cpp: | ||
+ | <syntaxhighlight lang="cpp-qt"> | ||
+ | /* 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"); // Replace with what you want to play | ||
+ | p.show(); | ||
+ | return a.exec(); | ||
+ | } | ||
+ | </syntaxhighlight> | ||
+ | |||
+ | |||
+ | vlc_on_qt.h: | ||
+ | <syntaxhighlight lang="cpp-qt"> | ||
+ | /* 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 <QX11EmbedContainer> | ||
+ | #include <QWidget> | ||
+ | |||
+ | class QVBoxLayout; | ||
+ | class QPushButton; | ||
+ | class QTimer; | ||
+ | class QFrame; | ||
+ | class QSlider; | ||
+ | |||
+ | #define POSITION_RESOLUTION 10000 | ||
+ | |||
+ | class Player : public QWidget | ||
+ | { | ||
+ | Q_OBJECT | ||
+ | QSlider *_positionSlider; | ||
+ | QSlider *_volumeSlider; | ||
+ | // [20101215 JG] | ||
+ | // Tested on Linux OpenSuse and VLC 1.2.0. This version of VLC is not completely compatible with previous versions of VLC. | ||
+ | // [20101201 Ondra Spilka] | ||
+ | // on Linux/Ubuntu Lucid and VLC >= 1.0 (at least 1.1.5 was tested) XWindow handle have to be passed | ||
+ | // therefore QX11EmbedContainer have to be used instead of QFrame | ||
+ | #ifdef Q_WS_X11 | ||
+ | QX11EmbedContainer *_videoWidget; | ||
+ | #else | ||
+ | QFrame *_videoWidget; | ||
+ | #endif | ||
+ | // [20101215 JG] If KDE is used like unique desktop environment, only use QFrame *_videoWidget; | ||
+ | QTimer *poller; | ||
+ | bool _isPlaying; | ||
+ | //libvlc_exception_t _vlcexcep; // [20101215 JG] Used for versions prior to VLC 1.2.0. | ||
+ | libvlc_instance_t *_vlcinstance; | ||
+ | libvlc_media_player_t *_mp; | ||
+ | libvlc_media_t *_m; | ||
+ | |||
+ | public: | ||
+ | Player(); | ||
+ | ~Player(); | ||
+ | //void raise(libvlc_exception_t * ex); // [20101215 JG] Used for versions prior to VLC 1.2.0. | ||
+ | |||
+ | public slots: | ||
+ | void playFile(QString file); | ||
+ | void updateInterface(); | ||
+ | void changeVolume(int newVolume); | ||
+ | void changePosition(int newPosition); | ||
+ | |||
+ | }; | ||
+ | #endif | ||
+ | </syntaxhighlight> | ||
+ | |||
+ | |||
+ | vlc_on_qt.cpp: | ||
+ | <syntaxhighlight lang="cpp-qt"> | ||
+ | /* libVLC and Qt sample code | ||
+ | * Copyright © 2009 Alexander Maringer <maringer@maringer-it.de> | ||
+ | */ | ||
+ | #include "vlc_on_qt.h" | ||
+ | |||
+ | #include <QX11EmbedContainer> | ||
+ | #include <QVBoxLayout> | ||
+ | #include <QPushButton> | ||
+ | #include <QSlider> | ||
+ | #include <QTimer> | ||
+ | #include <QFrame> | ||
+ | |||
+ | Player::Player() | ||
+ | : QWidget() | ||
+ | { | ||
+ | //preparation of the vlc command | ||
+ | const char * const vlc_args[] = { | ||
+ | "--verbose=2", //be much more verbose then normal for debugging purpose | ||
+ | }; | ||
+ | |||
+ | #ifdef Q_WS_X11 | ||
+ | _videoWidget=new QX11EmbedContainer(this); | ||
+ | #else | ||
+ | _videoWidget=new QFrame(this); | ||
+ | #endif | ||
+ | // [20101215 JG] If KDE is used like unique desktop environment, only use _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); // [20101215 JG] Used for versions prior to VLC 1.2.0. | ||
+ | |||
+ | //create a new libvlc instance | ||
+ | _vlcinstance=libvlc_new(sizeof(vlc_args) / sizeof(vlc_args[0]), vlc_args); //tricky calculation of the char space used | ||
+ | //_vlcinstance=libvlc_new(sizeof(vlc_args) / sizeof(vlc_args[0]), vlc_args,&_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0. | ||
+ | //raise (&_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0. | ||
+ | |||
+ | // Create a media player playing environement | ||
+ | _mp = libvlc_media_player_new (_vlcinstance); | ||
+ | //_mp = libvlc_media_player_new (_vlcinstance, &_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0. | ||
+ | //raise (&_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0. | ||
+ | |||
+ | //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() | ||
+ | { | ||
+ | /* Stop playing */ | ||
+ | libvlc_media_player_stop (_mp); | ||
+ | //libvlc_media_player_stop (_mp, &_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0. | ||
+ | |||
+ | /* Free the media_player */ | ||
+ | libvlc_media_player_release (_mp); | ||
+ | |||
+ | libvlc_release (_vlcinstance); | ||
+ | //raise (&_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0. | ||
+ | } | ||
+ | |||
+ | 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_path(_vlcinstance, file.toAscii()); | ||
+ | //_m = libvlc_media_new (_vlcinstance, file.toAscii(), &_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0. | ||
+ | //raise(&_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0. | ||
+ | |||
+ | libvlc_media_player_set_media (_mp, _m); | ||
+ | //libvlc_media_player_set_media (_mp, _m, &_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0. | ||
+ | //raise(&_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0. | ||
+ | |||
+ | // /!\ 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 */ | ||
+ | #if defined(Q_OS_WIN) | ||
+ | libvlc_media_player_set_drawable(_mp, reinterpret_cast<unsigned int>(_videoWidget->winId())); | ||
+ | //libvlc_media_player_set_drawable(_mp, reinterpret_cast<unsigned int>(_videoWidget->winId()), &_vlcexcep ); // [20101215 JG] Used for versions prior to VLC 1.2.0. | ||
+ | //libvlc_media_player_set_hwnd(_mp, _videoWidget->winId(), &_vlcexcep ); // for vlc 1.0 | ||
+ | #elif defined(Q_OS_MAC) | ||
+ | libvlc_media_player_set_drawable(_mp, _videoWidget->winId()); | ||
+ | //libvlc_media_player_set_drawable(_mp, _videoWidget->winId(), &_vlcexcep ); // [20101215 JG] Used for versions prior to VLC 1.2.0. | ||
+ | //libvlc_media_player_set_agl (_mp, _videoWidget->winId(), &_vlcexcep); // for vlc 1.0 | ||
+ | #else //Linux | ||
+ | //[20101201 Ondrej Spilka] obsolete call on libVLC >=1.1.5 | ||
+ | //libvlc_media_player_set_drawable(_mp, _videoWidget->winId(), &_vlcexcep ); | ||
+ | //libvlc_media_player_set_xwindow(_mp, _videoWidget->winId(), &_vlcexcep ); // for vlc 1.0 | ||
+ | |||
+ | /* again note X11 handle on Linux is needed | ||
+ | winID() returns X11 handle when QX11EmbedContainer us used */ | ||
+ | |||
+ | int windid = _videoWidget->winId(); | ||
+ | libvlc_media_player_set_xwindow (_mp, windid ); | ||
+ | |||
+ | #endif | ||
+ | //raise(&_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0. | ||
+ | |||
+ | /* Play */ | ||
+ | libvlc_media_player_play (_mp); | ||
+ | //libvlc_media_player_play (_mp, &_vlcexcep ); // [20101215 JG] Used for versions prior to VLC 1.2.0. | ||
+ | //raise(&_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0. | ||
+ | |||
+ | _isPlaying=true; | ||
+ | } | ||
+ | |||
+ | void Player::changeVolume(int newVolume) | ||
+ | { | ||
+ | //libvlc_exception_clear(&_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0. | ||
+ | libvlc_audio_set_volume (_mp,newVolume); | ||
+ | //libvlc_audio_set_volume (_vlcinstance,newVolume , &_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0. | ||
+ | //raise(&_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0. | ||
+ | } | ||
+ | |||
+ | void Player::changePosition(int newPosition) | ||
+ | { | ||
+ | //libvlc_exception_clear(&_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0. | ||
+ | // It's possible that the vlc doesn't play anything | ||
+ | // so check before | ||
+ | libvlc_media_t *curMedia = libvlc_media_player_get_media (_mp); | ||
+ | //libvlc_media_t *curMedia = libvlc_media_player_get_media (_mp, &_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0. | ||
+ | //libvlc_exception_clear(&_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0. | ||
+ | if (curMedia == NULL) | ||
+ | return; | ||
+ | |||
+ | float pos=(float)(newPosition)/(float)POSITION_RESOLUTION; | ||
+ | libvlc_media_player_set_position (_mp, pos); | ||
+ | //libvlc_media_player_set_position (_mp, pos, &_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0. | ||
+ | //raise(&_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0. | ||
+ | } | ||
+ | |||
+ | 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); | ||
+ | //libvlc_media_t *curMedia = libvlc_media_player_get_media (_mp, &_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0. | ||
+ | //libvlc_exception_clear(&_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0. | ||
+ | if (curMedia == NULL) | ||
+ | return; | ||
+ | |||
+ | float pos=libvlc_media_player_get_position (_mp); | ||
+ | //float pos=libvlc_media_player_get_position (_mp, &_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0. | ||
+ | int siderPos=(int)(pos*(float)(POSITION_RESOLUTION)); | ||
+ | _positionSlider->setValue(siderPos); | ||
+ | int volume=libvlc_audio_get_volume (_mp); | ||
+ | //int volume=libvlc_audio_get_volume (_vlcinstance,&_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0. | ||
+ | _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); | ||
+ | } | ||
+ | }*/ // [20101215 JG] Used for versions prior to VLC 1.2.0. | ||
+ | </syntaxhighlight> | ||
+ | |||
+ | [[Category:libVLC]] | ||
+ | [[Category:Qt]] |
Latest revision as of 05:46, 17 March 2019
This page contains example code for libVLC. |
This page is outdated and information might be incorrect. Create an account to start editing, and then click here to update this article. |
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
This was tested with vlc-1.1.9 and Qt 4.7.2 and Ubuntu 11.04
Contents
How to use?
You need libvlc headers and Qt headers.Take those 3 files, put them in a folder. Run
qmake -project
Edit the .pro file and add
LIBS += -L*path to vlc lib* #if you are at windows os LIBS += -lvlc
Run
qmake
and then
make or mingw32-make under a Windows OS
On win os you have to use the zip file. the lib and the header files are located in the sdk-folder.
Notes
Depending on your distribution and the way you install Qt and Vlc it may be a good idea to reset the vlc's module cache:
sudo /usr/lib/vlc/vlc-cache-gen -f /usr/lib/vlc/plugins/
or:
vlc --reset-plugins-cache
VLC 1.1.5 and Ubuntu Lucid
[Rafael Capucho<rafael.capucho@gmail.com> 20120713] Modified to include properly QX11EmbedContainer header that was missing.- tested ok
[Ondrej Spilka 20101201] slightly modified for the modest versions... - X11 embed container have to be used, therefore QX11EmbedContainer rather than QFrame have to be used.- tested ok
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"); // Replace with what you want to play
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>
#include <QX11EmbedContainer>
class QVBoxLayout;
class QPushButton;
class QTimer;
class QFrame;
class QSlider;
#define POSITION_RESOLUTION 10000
class Player : public QWidget
{
Q_OBJECT
QSlider *_positionSlider;
QSlider *_volumeSlider;
// [20101201 Ondra Spilka]
// on Linux/Ubuntu Lucid and VLC >= 1.0 (at least 1.1.5 was tested) XWindow handle have to be passed
// therefore QX11EmbedContainer have to be used instead of QFrame
#ifdef Q_WS_X11
QX11EmbedContainer *_videoWidget;
#else
QFrame *_videoWidget;
#endif
QTimer *poller;
bool _isPlaying;
libvlc_exception_t _vlcexcep;
libvlc_instance_t *_vlcinstance;
libvlc_media_player_t *_mp;
libvlc_media_t *_m;
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 <QX11EmbedContainer>
#include <QVBoxLayout>
#include <QPushButton>
#include <QSlider>
#include <QTimer>
#include <QFrame>
Player::Player()
: QWidget()
{
//preparation of the vlc command
const char * const vlc_args[] = {
"--verbose=2", //be much more verbose then normal for debugging purpose
"--plugin-path=C:\\vlc-0.9.9-win32\\plugins\\" };
#ifdef Q_WS_X11
_videoWidget=new QX11EmbedContainer(this);
#else
_videoWidget=new QFrame(this);
#endif
_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()
{
/* Stop playing */
libvlc_media_player_stop (_mp, &_vlcexcep);
/* Free the media_player */
libvlc_media_player_release (_mp);
libvlc_release (_vlcinstance);
raise (&_vlcexcep);
}
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 */
#if defined(Q_OS_WIN)
libvlc_media_player_set_drawable(_mp, reinterpret_cast<unsigned int>(_videoWidget->winId()), &_vlcexcep );
//libvlc_media_player_set_hwnd(_mp, _videoWidget->winId(), &_vlcexcep ); // for vlc 1.0
#elif defined(Q_OS_MAC)
libvlc_media_player_set_drawable(_mp, _videoWidget->winId(), &_vlcexcep );
//libvlc_media_player_set_agl (_mp, _videoWidget->winId(), &_vlcexcep); // for vlc 1.0
#else //Linux
//[20101201 Ondrej Spilka] obsolete call on libVLC >=1.1.5
//libvlc_media_player_set_drawable(_mp, _videoWidget->winId(), &_vlcexcep );
//libvlc_media_player_set_xwindow(_mp, _videoWidget->winId(), &_vlcexcep ); // for vlc 1.0
/* again note X11 handle on Linux is needed
winID() returns X11 handle when QX11EmbedContainer us used */
int windid = _videoWidget->winId();
libvlc_media_player_set_xwindow (mp, windid );
#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=(float)(newPosition)/(float)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);
}
}
VLC 1.2 and OpenSuse 11.3
[Rafael Capucho<rafael.capucho@gmail.com> 20120713] Modified to include properly QX11EmbedContainer header that was missing.- tested ok
[Jofre Guevara 20101215] Modifications of original template based on new VLC version.
[Ondrej Spilka 20101201] slightly modified for the modest versions...
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"); // Replace with what you want to play
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 <QX11EmbedContainer>
#include <QWidget>
class QVBoxLayout;
class QPushButton;
class QTimer;
class QFrame;
class QSlider;
#define POSITION_RESOLUTION 10000
class Player : public QWidget
{
Q_OBJECT
QSlider *_positionSlider;
QSlider *_volumeSlider;
// [20101215 JG]
// Tested on Linux OpenSuse and VLC 1.2.0. This version of VLC is not completely compatible with previous versions of VLC.
// [20101201 Ondra Spilka]
// on Linux/Ubuntu Lucid and VLC >= 1.0 (at least 1.1.5 was tested) XWindow handle have to be passed
// therefore QX11EmbedContainer have to be used instead of QFrame
#ifdef Q_WS_X11
QX11EmbedContainer *_videoWidget;
#else
QFrame *_videoWidget;
#endif
// [20101215 JG] If KDE is used like unique desktop environment, only use QFrame *_videoWidget;
QTimer *poller;
bool _isPlaying;
//libvlc_exception_t _vlcexcep; // [20101215 JG] Used for versions prior to VLC 1.2.0.
libvlc_instance_t *_vlcinstance;
libvlc_media_player_t *_mp;
libvlc_media_t *_m;
public:
Player();
~Player();
//void raise(libvlc_exception_t * ex); // [20101215 JG] Used for versions prior to VLC 1.2.0.
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 <QX11EmbedContainer>
#include <QVBoxLayout>
#include <QPushButton>
#include <QSlider>
#include <QTimer>
#include <QFrame>
Player::Player()
: QWidget()
{
//preparation of the vlc command
const char * const vlc_args[] = {
"--verbose=2", //be much more verbose then normal for debugging purpose
};
#ifdef Q_WS_X11
_videoWidget=new QX11EmbedContainer(this);
#else
_videoWidget=new QFrame(this);
#endif
// [20101215 JG] If KDE is used like unique desktop environment, only use _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); // [20101215 JG] Used for versions prior to VLC 1.2.0.
//create a new libvlc instance
_vlcinstance=libvlc_new(sizeof(vlc_args) / sizeof(vlc_args[0]), vlc_args); //tricky calculation of the char space used
//_vlcinstance=libvlc_new(sizeof(vlc_args) / sizeof(vlc_args[0]), vlc_args,&_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0.
//raise (&_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0.
// Create a media player playing environement
_mp = libvlc_media_player_new (_vlcinstance);
//_mp = libvlc_media_player_new (_vlcinstance, &_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0.
//raise (&_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0.
//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()
{
/* Stop playing */
libvlc_media_player_stop (_mp);
//libvlc_media_player_stop (_mp, &_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0.
/* Free the media_player */
libvlc_media_player_release (_mp);
libvlc_release (_vlcinstance);
//raise (&_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0.
}
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_path(_vlcinstance, file.toAscii());
//_m = libvlc_media_new (_vlcinstance, file.toAscii(), &_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0.
//raise(&_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0.
libvlc_media_player_set_media (_mp, _m);
//libvlc_media_player_set_media (_mp, _m, &_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0.
//raise(&_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0.
// /!\ 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 */
#if defined(Q_OS_WIN)
libvlc_media_player_set_drawable(_mp, reinterpret_cast<unsigned int>(_videoWidget->winId()));
//libvlc_media_player_set_drawable(_mp, reinterpret_cast<unsigned int>(_videoWidget->winId()), &_vlcexcep ); // [20101215 JG] Used for versions prior to VLC 1.2.0.
//libvlc_media_player_set_hwnd(_mp, _videoWidget->winId(), &_vlcexcep ); // for vlc 1.0
#elif defined(Q_OS_MAC)
libvlc_media_player_set_drawable(_mp, _videoWidget->winId());
//libvlc_media_player_set_drawable(_mp, _videoWidget->winId(), &_vlcexcep ); // [20101215 JG] Used for versions prior to VLC 1.2.0.
//libvlc_media_player_set_agl (_mp, _videoWidget->winId(), &_vlcexcep); // for vlc 1.0
#else //Linux
//[20101201 Ondrej Spilka] obsolete call on libVLC >=1.1.5
//libvlc_media_player_set_drawable(_mp, _videoWidget->winId(), &_vlcexcep );
//libvlc_media_player_set_xwindow(_mp, _videoWidget->winId(), &_vlcexcep ); // for vlc 1.0
/* again note X11 handle on Linux is needed
winID() returns X11 handle when QX11EmbedContainer us used */
int windid = _videoWidget->winId();
libvlc_media_player_set_xwindow (_mp, windid );
#endif
//raise(&_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0.
/* Play */
libvlc_media_player_play (_mp);
//libvlc_media_player_play (_mp, &_vlcexcep ); // [20101215 JG] Used for versions prior to VLC 1.2.0.
//raise(&_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0.
_isPlaying=true;
}
void Player::changeVolume(int newVolume)
{
//libvlc_exception_clear(&_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0.
libvlc_audio_set_volume (_mp,newVolume);
//libvlc_audio_set_volume (_vlcinstance,newVolume , &_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0.
//raise(&_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0.
}
void Player::changePosition(int newPosition)
{
//libvlc_exception_clear(&_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0.
// It's possible that the vlc doesn't play anything
// so check before
libvlc_media_t *curMedia = libvlc_media_player_get_media (_mp);
//libvlc_media_t *curMedia = libvlc_media_player_get_media (_mp, &_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0.
//libvlc_exception_clear(&_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0.
if (curMedia == NULL)
return;
float pos=(float)(newPosition)/(float)POSITION_RESOLUTION;
libvlc_media_player_set_position (_mp, pos);
//libvlc_media_player_set_position (_mp, pos, &_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0.
//raise(&_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0.
}
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);
//libvlc_media_t *curMedia = libvlc_media_player_get_media (_mp, &_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0.
//libvlc_exception_clear(&_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0.
if (curMedia == NULL)
return;
float pos=libvlc_media_player_get_position (_mp);
//float pos=libvlc_media_player_get_position (_mp, &_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0.
int siderPos=(int)(pos*(float)(POSITION_RESOLUTION));
_positionSlider->setValue(siderPos);
int volume=libvlc_audio_get_volume (_mp);
//int volume=libvlc_audio_get_volume (_vlcinstance,&_vlcexcep); // [20101215 JG] Used for versions prior to VLC 1.2.0.
_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);
}
}*/ // [20101215 JG] Used for versions prior to VLC 1.2.0.