Difference between revisions of "LibVLC SampleCode Qt"

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Line 291: Line 291:
 
     }
 
     }
 
}
 
}
 +
</pre>
 +
 +
== VLC 1.2 and OpenSuse 11.3 ==
 +
[Jofre Guevara 20101215] Modifications of original template based on new VLC version.
 +
[Ondrej Spilka 20101201] slightly modified for the modest versions...
 +
- tested ok
 +
 +
 +
== Files ==
 +
 +
main.cpp:
 +
<pre>
 +
/* 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();
 +
}
 +
</pre>
 +
 +
 +
vlc_on_qt.h:
 +
<pre>
 +
/* 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 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
 +
</pre>
 +
 +
 +
vlc_on_qt.cpp:
 +
<pre>
 +
/* libVLC and Qt sample code
 +
* Copyright © 2009 Alexander Maringer <maringer@maringer-it.de>
 +
*/
 +
#include "vlc_on_qt.h"
 +
 +
#include <QVBoxLayout>
 +
#include <QPushButton>
 +
#include <QSlider>
 +
#include <QTimer>
 +
#include <QFrame>
 +
 +
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\\" };
 +
 +
#ifdef Q_WS_X11
 +
    QX11EmbedContainer *_videoWidget;
 +
#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.
 
</pre>
 
</pre>

Revision as of 17:26, 15 December 2010

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?

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.

VLC 1.1.5 and Ubutnu Lucid

[Ondrej Spilka 20101201] slightly modified for the modest versions... - tested ok - X11 embed container have to be used, therefore QX11EmbedContainer rather than QFrame have to be used.


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>

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 <QVBoxLayout>
#include <QPushButton>
#include <QSlider>
#include <QTimer>
#include <QFrame>

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\\" };

#ifdef Q_WS_X11    
    QX11EmbedContainer *_videoWidget;
#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

[Jofre Guevara 20101215] Modifications of original template based on new VLC version. [Ondrej Spilka 20101201] slightly modified for the modest versions... - 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>

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 <QVBoxLayout>
#include <QPushButton>
#include <QSlider>
#include <QTimer>
#include <QFrame>

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\\" };

#ifdef Q_WS_X11
    QX11EmbedContainer *_videoWidget;
#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.
Retrieved from "https://wiki.videolan.org/index.php?title=LibVLC_SampleCode_Qt&oldid=18131"