Difference between revisions of "LibVLC SampleCode Qt"
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(Initial Release) |
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}; | }; | ||
#endif | #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 <QWidget> | ||
+ | #include <QSizePolicy> | ||
+ | #include <QPushButton> | ||
+ | #include <QTextEdit> | ||
+ | #include <QSlider> | ||
+ | #include <QCloseEvent> | ||
+ | #include <QTimer> | ||
+ | #include <QDebug> | ||
+ | |||
+ | Player::Player() | ||
+ | : QWidget() | ||
+ | { | ||
+ | //mise en place des widgets | ||
+ | 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 */ | ||
+ | libvlc_media_player_set_drawable( _mp, reinterpret_cast<unsigned int>(_videoWidget->winId()), &_vlcexcep ); | ||
+ | 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; | ||
+ | |||
+ | //input sert a recuperer les info sur la lecture en cours | ||
+ | //input sert aussi a controller certains aspect de la lecture | ||
+ | //on recupere la position (entre 0.0f et 1.0f) | ||
+ | |||
+ | 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); | ||
+ | } | ||
+ | } | ||
</pre> | </pre> |
Revision as of 00:18, 22 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.
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() { //mise en place des widgets 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 */ libvlc_media_player_set_drawable( _mp, reinterpret_cast<unsigned int>(_videoWidget->winId()), &_vlcexcep ); 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; //input sert a recuperer les info sur la lecture en cours //input sert aussi a controller certains aspect de la lecture //on recupere la position (entre 0.0f et 1.0f) 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); } }