在实现播放器的时候，我们需要捕获键盘、鼠标事件进行视频快进、快退，或者双击全屏/退出全屏窗口、鼠标右键弹出菜单栏。默认情况下，在使用libVLC库的时候，我们无法捕获这些事件，因为我们将Qt的视频窗口传递给了libVLC。
cpp
libvlc_media_player_set_hwnd(vlc_mediaPlayer, (void *)ui.widgetShow->winId());但是libVLC提供了两个接口，使得忽略了对鼠标键盘事件的处理，让事件返回到原始Qt的widget上。
cpp
libvlc_video_set_mouse_input(vlc_mediaPlayer, 0);
libvlc_video_set_key_input(vlc_mediaPlayer, 0);好了，知道了如何操作了之后，下面开始实现代码。
首先打开文件的时候禁用鼠标、键盘事件，并且设置视频窗口为Qt的Widget控件，libvlc_media_player_set_hwnd。
cpp
void showWidget::slotOpenFile()
{
/*选择文件*/
QString filename = QFileDialog::getOpenFileName(this, "选择打开的文件", "D:/", tr("*.*"));
std::replace(filename.begin(), filename.end(), QChar('/'), QChar('\\'));
vlc_base = libvlc_new(0, NULL);
vlc_media = libvlc_media_new_path(vlc_base, filename.toUtf8().data());
if (!vlc_media) {
return;
}
// 创建libvlc实例和媒体播放器
vlc_mediaPlayer = libvlc_media_player_new_from_media(vlc_media);
if (!vlc_mediaPlayer) {
return;
}
// 等待元数据加载完成
libvlc_media_parse(vlc_media);
m_defalutRate = libvlc_video_get_aspect_ratio(vlc_mediaPlayer);
m_defalutCrop = libvlc_video_get_crop_geometry(vlc_mediaPlayer);
libvlc_video_set_mouse_input(vlc_mediaPlayer, 0);
libvlc_video_set_key_input(vlc_mediaPlayer, 0);
// 获取各种元数据
const char *title = libvlc_media_get_meta(vlc_media, libvlc_meta_Title);
const char *artist = libvlc_media_get_meta(vlc_media, libvlc_meta_Artist);
const char *album = libvlc_media_get_meta(vlc_media, libvlc_meta_Album);
const char *url = libvlc_media_get_meta(vlc_media, libvlc_meta_URL);
const char *date = libvlc_media_get_meta(vlc_media, libvlc_meta_Date);
const char *lang = libvlc_media_get_meta(vlc_media, libvlc_meta_Language);
int duration = libvlc_media_get_duration(vlc_media); // 获取时长（单位：毫秒）
qDebug("Title: %s", title ? title : "N/A");
qDebug("Artist: %s", artist ? artist : "N/A");
qDebug("Album: %s", album ? album : "N/A");
qDebug("Duration: %d ms", duration);
qDebug("url: %s", url ? url : "N/A");
qDebug("date: %s", date ? date : "N/A");
qDebug("lang: %s", lang ? lang : "N/A");
libvlc_media_track_t **tracks;
int track_count = libvlc_media_tracks_get(vlc_media,&tracks);
for (unsigned i = 0; i < track_count; i++)
{
libvlc_media_track_t* track = tracks[i];
// 显示轨道信息
printf("Track #%u: %s\n", i, track->psz_description);
// 这里可以获取到每一个轨道的信息，比如轨道类型 track->i_type
// 可能是 libvlc_track_video, libvlc_track_audio 或者 libvlc_track_text (字幕)
if (track->i_type == libvlc_track_video) {
// 处理视频轨道信息
qDebug("width = %d",track->video->i_width);
qDebug("height = %d", track->video->i_height);
qDebug("rate_num = %d", track->video->i_frame_rate_num);
qDebug("rate_den = %d", track->video->i_frame_rate_den);
}
else if (track->i_type == libvlc_track_audio) {
// 处理音频轨道信息
qDebug("channels = %d", track->audio->i_channels);
qDebug("rate = %d", track->audio->i_rate);
}
else if (track->i_type == libvlc_track_text) {
// 处理字幕轨道信息
}
}
//获取事件管理器
libvlc_event_manager_t *em = libvlc_media_player_event_manager(vlc_mediaPlayer);
// 注册事件监听器
libvlc_event_attach(em, libvlc_MediaPlayerTimeChanged, vlcEvents, this);
libvlc_event_attach(em, libvlc_MediaPlayerEndReached, vlcEvents, this);
libvlc_event_attach(em, libvlc_MediaPlayerStopped, vlcEvents, this);
libvlc_event_attach(em, libvlc_MediaPlayerPlaying, vlcEvents, this);
libvlc_event_attach(em, libvlc_MediaPlayerPaused, vlcEvents, this);
libvlc_media_player_set_hwnd(vlc_mediaPlayer, (void *)ui.widgetShow->winId());
QTimer::singleShot(1000, this, &showWidget::slotPlay);
}然后鼠标右键显示菜单：
代码实现：
cpp
//.h
QMenu *m_menu = nullptr;
QAction *m_video = nullptr;
QAction *m_scaleAction = nullptr; //缩放
QAction *m_aspectRatioAction = nullptr; //宽高比
QAction *m_cropAction = nullptr; //裁剪
QMenu *m_videoMenu = nullptr;
//.cpp
//总菜单
m_menu = new QMenu(this);
m_video = m_menu->addAction("视频");
//视频菜单
m_videoMenu = new QMenu(this);
m_scaleAction = m_videoMenu->addAction("缩放");
m_aspectRatioAction = m_videoMenu->addAction("宽高比");
m_cropAction = m_videoMenu->addAction("裁剪");
m_video->setMenu(m_videoMenu);
//宽高比菜单
m_aspectRatioMenu = new QMenu(this);
m_aspectRatioAction->setMenu(m_aspectRatioMenu);
重写鼠标和键盘事件。
cpp
protected:
virtual void mousePressEvent(QMouseEvent *event);
virtual void mouseDoubleClickEvent(QMouseEvent *event);
virtual void keyPressEvent(QKeyEvent *event);鼠标双击全屏。
cpp
void showWidget::mouseDoubleClickEvent(QMouseEvent *event)
{
if (this->isFullScreen())
{
this->showNormal();
}
else
{
this->showFullScreen();
}
}键盘事件：调节W、S键音量大小和space键暂停和播放。
cpp
void showWidget::keyPressEvent(QKeyEvent *event)
{
if (!vlc_mediaPlayer)
return;
int value = ui.hSliderVolumn->value();
if (event->key() == Qt::Key_W) //添加音量
{
qDebug() << "up";
slotValueChanged(value+10);
}
else if (event->key() == Qt::Key_S) //减小音量
{
slotValueChanged(value - 10);
}
else if (event->key() == Qt::Key_Space)
{
if (vlc_mediaPlayer && libvlc_media_player_get_state(vlc_mediaPlayer) == libvlc_Playing)
{
libvlc_media_player_pause(vlc_mediaPlayer);
}
else if (vlc_mediaPlayer && libvlc_media_player_get_state(vlc_mediaPlayer) == libvlc_Paused)
{
libvlc_media_player_play(vlc_mediaPlayer);
}
}
}
void showWidget::slotValueChanged(int value)
{
if (vlc_mediaPlayer)
libvlc_audio_set_volume(vlc_mediaPlayer, value);
}鼠标点击弹出菜单。
cpp
void showWidget::mousePressEvent(QMouseEvent *event)
{
switch (event->button())
{
case Qt::RightButton:
//this->setWindowState(Qt::WindowMinimized);
m_menu->exec(event->globalPos());
break;
default:
QWidget::mousePressEvent(event);
}
}更多参考：
https://sunnnnnn666.blog.csdn.net/article/details/136854500