先看看分割后的界面吧，根据分割的数量，来分割视频画面。
其实视频界面分割很简单，看过叠加窗口的这篇文章，不难理解，如何分割。
如果还是不懂的话，我讲解一下原理，其实就是在上面叠加透明窗口界面，在叠加的窗口上面调用
paintEvent绘制线条，很简单吧。
cpp
void TopWidget::paintEvent(QPaintEvent *pEvent)
{
//创建QPainter对象，指明父对象，否则不能看见
QPainter painter(this);
//先画一条线
QPen pen;
//设置线宽
pen.setWidth(10);
//设置颜色
pen.setColor(Qt::white);
//设置线的样式 实线、虚线
pen.setStyle(Qt::SolidLine);
//设置线端点样式
pen.setCapStyle(Qt::RoundCap);
//设置画笔
painter.setPen(pen);
for (int i = 0; i < m_num; i++)
{
//画竖线
painter.drawLine(QPoint(width() * (i+1)/ (m_num+1), 0), QPoint(width() * (i + 1) / (m_num + 1), height()));
//画横线
painter.drawLine(QPoint(0, height() * (i + 1) / (m_num + 1)), QPoint(width(), height() * (i + 1) / (m_num + 1)));
}
}更多QPainter相关的东西，请看：
Qt QPainter绘图_qt painter-CSDN博客
还是像之前的文章一样，先创建一个叠加界面，设置窗体无边框和透明。
cpp
//窗口无边框
setWindowFlags(Qt::FramelessWindowHint | Qt::Window);
// 窗口透明
this->setAttribute(Qt::WA_TranslucentBackground);界面源码如下，ui上面没有任何控件。
cpp
#pragma once
#include <QWidget>
#include <QPaintEvent>
#include <QPainter>
#include "ui_TopWidget.h"
class TopWidget : public QWidget
{
Q_OBJECT
public:
TopWidget(QWidget *parent = nullptr);
~TopWidget();
void setNum(int num);
protected:
void paintEvent(QPaintEvent *pEvent);
private:
Ui::TopWidgetClass ui;
int m_num = 0;
};
#include "TopWidget.h"
TopWidget::TopWidget(QWidget *parent)
: QWidget(parent)
{
ui.setupUi(this);
//窗口无边框
setWindowFlags(Qt::FramelessWindowHint | Qt::Window);
// 窗口透明
this->setAttribute(Qt::WA_TranslucentBackground);
}
TopWidget::~TopWidget()
{}
void TopWidget::setNum(int num)
{
m_num = num;
update();
}
void TopWidget::paintEvent(QPaintEvent *pEvent)
{
//创建QPainter对象，指明父对象，否则不能看见
QPainter painter(this);
//先画一条线
QPen pen;
//设置线宽
pen.setWidth(10);
//设置颜色
pen.setColor(Qt::white);
//设置线的样式 实线、虚线
pen.setStyle(Qt::SolidLine);
//设置线端点样式
pen.setCapStyle(Qt::RoundCap);
//设置画笔
painter.setPen(pen);
for (int i = 0; i < m_num; i++)
{
//画竖线
painter.drawLine(QPoint(width() * (i+1)/ (m_num+1), 0), QPoint(width() * (i + 1) / (m_num + 1), height()));
//画横线
painter.drawLine(QPoint(0, height() * (i + 1) / (m_num + 1)), QPoint(width(), height() * (i + 1) / (m_num + 1)));
}
}主界面重写绘图和窗体移动事件：我们需要在主窗体移动的时候，叠加窗体跟随着主窗体移动。
cpp
void showWidget::paintEvent(QPaintEvent *event)
{
QPoint pos_form = ui.widgetShow->mapToGlobal(ui.widgetShow->pos());
m_widget->move(pos_form);
m_widget->setGeometry(pos_form.x(), pos_form.y(), ui.widgetShow->width(), ui.widgetShow->height());
}
void showWidget::moveEvent(QMoveEvent *event)
{
QPoint pos_form = ui.widgetShow->mapToGlobal(ui.widgetShow->pos());
m_widget->move(pos_form);
m_widget->setGeometry(pos_form.x(), pos_form.y(), ui.widgetShow->width(), ui.widgetShow->height());
}完整源码：
cpp
#pragma once
#define LIBVLC_USE_PTHREAD_CANCEL 1
#include <QtWidgets/QWidget>
#include "ui_showWidget.h"
#include <QMenu>
#include <QActionGroup>
#include <vlc/vlc.h>
#include <QDebug>
#include <QFileDialog>
#include <QThread>
#include <QMouseEvent>
#include <QKeyEvent>
#include <QPainter>
#include "TopWidget.h"
enum Rate
{
Rate2X,
Rate1_5X,
Rate1_25X,
Rate1_0X,
Rate0_75X,
Rate0_5X
};
class showWidget : public QWidget
{
Q_OBJECT
public:
showWidget(QWidget *parent = nullptr);
~showWidget();
protected:
virtual void mouseDoubleClickEvent(QMouseEvent *event);
virtual void keyPressEvent(QKeyEvent *event);
virtual bool eventFilter(QObject *watched, QEvent *event);
virtual void paintEvent(QPaintEvent *event);
virtual void moveEvent(QMoveEvent *event);
private slots:
void slotOpenFile();
void slotPlay();
void slotPause();
void slotStop();
void slotValueChanged(int value);
void slotCurrentIndexChanged(int index);
void slotSnap();
void slotCurrentSplitChanged(int index);
private:
//事件处理回调
static void vlcEvents(const libvlc_event_t *ev, void *param);
private:
Ui::showWidgetClass ui;
private:
libvlc_instance_t *vlc_base = nullptr;
libvlc_media_t *vlc_media = nullptr;
libvlc_media_player_t *vlc_mediaPlayer = nullptr;
QList<float> m_lstRate;
TopWidget *m_widget = nullptr;
};
//=========================================================
#include "showWidget.h"
#include <QTimer>
#include <QTime>
#include <QFileDialog>
#pragma execution_character_set("utf-8")
showWidget::showWidget(QWidget *parent)
: QWidget(parent)
{
ui.setupUi(this);
this->setWindowTitle("视频播放器");
m_widget = new TopWidget(this);
//m_widget->setStyleSheet(QString("background-color: rgba(255, 0, 0, 0%);"));
m_widget->show();
ui.cbxRate->setCurrentIndex(Rate1_0X);
m_lstRate << 2.0 << 1.5 << 1.25 << 1.0 << 0.75 << 0.5;
vlc_base = libvlc_new(0, NULL);
ui.btnOpen->setFocusPolicy(Qt::NoFocus);
ui.btnPlay->setFocusPolicy(Qt::NoFocus);
ui.btnPause->setFocusPolicy(Qt::NoFocus);
ui.btnStop->setFocusPolicy(Qt::NoFocus);
ui.hSliderVolumn->setFocusPolicy(Qt::NoFocus);
ui.cbxRate->setFocusPolicy(Qt::NoFocus);
ui.horizontalSlider->installEventFilter(this);
connect(ui.btnOpen, &QPushButton::clicked, this, &showWidget::slotOpenFile);
connect(ui.btnPlay, &QPushButton::clicked, this, &showWidget::slotPlay);
connect(ui.btnPause, &QPushButton::clicked, this, &showWidget::slotPause);
connect(ui.btnStop, &QPushButton::clicked, this, &showWidget::slotStop);
connect(ui.btnSnap, &QPushButton::clicked, this, &showWidget::slotSnap);
connect(ui.hSliderVolumn, &QSlider::valueChanged, this, &showWidget::slotValueChanged);
connect(ui.cbxRate,SIGNAL(currentIndexChanged(int)), this, SLOT(slotCurrentIndexChanged(int)));
connect(ui.comboBox, SIGNAL(currentIndexChanged(int)), this, SLOT(slotCurrentSplitChanged(int)));
}
showWidget::~showWidget()
{
libvlc_release(vlc_base); //减少libvlc实例的引用计数，并销毁
}
void showWidget::mouseDoubleClickEvent(QMouseEvent *event)
{
if (this->isFullScreen())
{
this->showNormal();
}
else
{
this->showFullScreen();
}
}
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);
}
}
}
bool showWidget::eventFilter(QObject *watched, QEvent *event)
{
if (watched == ui.horizontalSlider) {
if (event->type() == QEvent::MouseButtonPress) {
if (!vlc_mediaPlayer)
return false;
QMouseEvent *mouse = static_cast<QMouseEvent*>(event);
libvlc_time_t totalLen = libvlc_media_player_get_length(vlc_mediaPlayer);
QPoint pos = mouse->pos();
libvlc_time_t time = 0;
time = (double)pos.x() / ui.horizontalSlider->width() * totalLen;
libvlc_media_player_set_time(vlc_mediaPlayer, time);
return true;
}
else {
return false;
}
}
else {
// pass the event on to the parent class
return QWidget::eventFilter(watched, event);
}
}
void showWidget::paintEvent(QPaintEvent *event)
{
QPoint pos_form = ui.widgetShow->mapToGlobal(ui.widgetShow->pos());
m_widget->move(pos_form);
m_widget->setGeometry(pos_form.x(), pos_form.y(), ui.widgetShow->width(), ui.widgetShow->height());
}
void showWidget::moveEvent(QMoveEvent *event)
{
QPoint pos_form = ui.widgetShow->mapToGlobal(ui.widgetShow->pos());
m_widget->move(pos_form);
m_widget->setGeometry(pos_form.x(), pos_form.y(), ui.widgetShow->width(), ui.widgetShow->height());
}
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_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);
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
qDebug("psz_encoding = %s", track->subtitle->psz_encoding);
}
}
//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);
}
void showWidget::slotPlay()
{
if (vlc_mediaPlayer)
libvlc_media_player_play(vlc_mediaPlayer);
}
void showWidget::slotPause()
{
if (vlc_mediaPlayer)
libvlc_media_player_pause(vlc_mediaPlayer);
}
void showWidget::slotStop()
{
if (vlc_mediaPlayer)
libvlc_media_player_stop(vlc_mediaPlayer);
}
void showWidget::slotValueChanged(int value)
{
if (vlc_mediaPlayer)
libvlc_audio_set_volume(vlc_mediaPlayer, value);
}
void showWidget::slotCurrentIndexChanged(int index)
{
if (vlc_mediaPlayer)
libvlc_media_player_set_rate(vlc_mediaPlayer, m_lstRate[index]);
}
void showWidget::slotSnap()
{
if (vlc_mediaPlayer)
{
QString path = "./snap.png";
libvlc_video_take_snapshot(vlc_mediaPlayer, 0, path.toUtf8().data(), 0, 0);
}
}
void showWidget::slotCurrentSplitChanged(int index)
{
m_widget->setNum(index);
}
//事件回调
void showWidget::vlcEvents(const libvlc_event_t *ev, void *param)
{
showWidget *w = (showWidget*)param;
//处理不同的事件
switch (ev->type) {
case libvlc_MediaPlayerTimeChanged:
{
//qDebug() << "VLC媒体播放器时间已更改";
qint64 len = libvlc_media_player_get_time(w->vlc_mediaPlayer);
libvlc_time_t lenSec = len / 1000;
libvlc_time_t totalLen = libvlc_media_player_get_length(w->vlc_mediaPlayer);
libvlc_time_t totalLenSec = totalLen / 1000;
int thh, tmm, tss;
thh = lenSec / 3600;
tmm = (lenSec % 3600) / 60;
tss = (lenSec % 60);
QTime time(thh, tmm, tss);
w->ui.lbCurTime->setText(time.toString("hh:mm:ss"));
thh = totalLenSec / 3600;
tmm = (totalLenSec % 3600) / 60;
tss = (totalLenSec % 60);
QTime TotalTime(thh, tmm, tss);
w->ui.lbTotalTime->setText(TotalTime.toString("hh:mm:ss"));
double pos = (double)lenSec / totalLenSec * 100;
w->ui.horizontalSlider->setValue(pos);
}
break;
case libvlc_MediaPlayerEndReached:
qDebug() << "VLC播放完毕.";
break;
case libvlc_MediaPlayerStopped:
qDebug() << "VLC停止播放";
break;
case libvlc_MediaPlayerPlaying:
qDebug() << "VLC开始播放";
break;
case libvlc_MediaPlayerPaused:
qDebug() << "VLC暂停播放";
break;
}
}以下是ui原型图：
