VS+Qt实现视频播放（载入视频，播放视频，停止，进度条）

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我不是萧海哇 2022-09-16 06:59:26 ©著作权

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VS+Qt实现视频播放（载入视频，播放视频，停止，进度条）_ide

PlayerSlider中的代码：

#ifndef PLAYERSLIDER_H
#define PLAYERSLIDER_H

#include <QSlider>
#include <QMouseEvent>
class PlayerSlider : public QSlider
{
  Q_OBJECT
public:
  PlayerSlider(QWidget * parent = 0);
  void        setProgress(qint64);
signals:
  void        sigProgress(qint64);
private:
  bool        m_bPressed;
protected:
  void        mousePressEvent(QMouseEvent *);
  void        mouseMoveEvent(QMouseEvent *);
  void        mouseReleaseEvent(QMouseEvent *);
};

#endif // PLAYERSLIDER_H

PlayerSlider.cpp中的代码：

#include "PlayerSlider.h"

PlayerSlider::PlayerSlider(QWidget * parent) : QSlider(parent)
{
  m_bPressed = false;
}

void PlayerSlider::mousePressEvent(QMouseEvent *e)
{
  m_bPressed = true;
  QSlider::mousePressEvent(e);//必须有这句，否则手动不能移动滑块
}

void PlayerSlider::mouseMoveEvent(QMouseEvent *e)
{
  QSlider::mouseMoveEvent(e);//必须有这句，否则手动不能移动滑块
}

void PlayerSlider::mouseReleaseEvent(QMouseEvent *e)
{
  m_bPressed = false;
  qint64 i64Pos = value();
  emit sigProgress(i64Pos);

  QSlider::mouseReleaseEvent(e);//必须有这句，否则手动不能移动滑块
}

void PlayerSlider::setProgress(qint64 i64Progress)
{
  if (!m_bPressed)
    setValue(i64Progress);
}

VedioPlayer.h中的代码：

#pragma once

#include <QtWidgets/QWidget>
#include "ui_VideoPlayer.h"
#include <QtMultimedia>
#include <QVideoWidget>

class VideoPlayer : public QWidget
{
  Q_OBJECT

public:
  VideoPlayer(QWidget *parent = Q_NULLPTR);
  bool            m_bReLoad;
  public slots:
  void            OnSetMediaFile(void);
  void            OnSlider(qint64);
  void            OnDurationChanged(qint64);
  void            OnStateChanged(QMediaPlayer::State);

private:
  Ui::VideoPlayerClass ui;
  QVideoWidget    *       m_pPlayerWidget;
  QMediaPlayer    *       m_pPlayer;
};

VedioPlayer.cpp中的代码：

#include "VideoPlayer.h"
#include <QFileDialog>
#include "ui_VideoPlayer.h"

VideoPlayer::VideoPlayer(QWidget *parent)
  : QWidget(parent)
{
  ui.setupUi(this);

  m_pPlayer = new QMediaPlayer;
  m_pPlayerWidget = new QVideoWidget;
  m_pPlayer->setVideoOutput(m_pPlayerWidget);
  ui.verticalLayout->addWidget(m_pPlayerWidget);

  m_pPlayerWidget->setAutoFillBackground(true);
  QPalette qplte;
  qplte.setColor(QPalette::Window, QColor(0, 0, 0));
  m_pPlayerWidget->setPalette(qplte);

  //载入
  connect(ui.BtnLoad, SIGNAL(clicked()), this, SLOT(OnSetMediaFile()));
  //播放
  connect(ui.BtnPlay, SIGNAL(clicked()), m_pPlayer, SLOT(play()));
  //停止
  connect(ui.BtnStop, SIGNAL(clicked()), m_pPlayer, SLOT(stop()));

  connect(m_pPlayer, SIGNAL(stateChanged(QMediaPlayer::State)), this, SLOT(OnStateChanged(QMediaPlayer::State)));

  ui.BtnStop->setEnabled(false);

  //设置滑块行为
  m_bReLoad = true;
  ui.slider->setEnabled(false);
  //ui.slider->setEnabled(false);
  connect(m_pPlayer, SIGNAL(positionChanged(qint64)), this, SLOT(OnSlider(qint64)));
  connect(m_pPlayer, SIGNAL(durationChanged(qint64)), this, SLOT(OnDurationChanged(qint64)));
  connect(ui.slider, SIGNAL(sigProgress(qint64)), m_pPlayer, SLOT(setPosition(qint64)));
}

void VideoPlayer::OnSetMediaFile(void)
{
  QFileDialog dialog(this);
  dialog.setFileMode(QFileDialog::AnyFile);
  QStringList fileNames;
  if (dialog.exec())
    fileNames = dialog.selectedFiles();

  if (!fileNames.empty())
  {
    m_pPlayer->setMedia(QUrl::fromLocalFile(fileNames[0]));
    m_bReLoad = true;
    ui.slider->setValue(0);
  }
}

void VideoPlayer::OnSlider(qint64 i64Pos)
{
  ui.slider->setProgress(i64Pos);
  //ui.horizontalSlider->setProgress(i64Pos);
}

void VideoPlayer::OnDurationChanged(qint64 i64Duration)
{
  if (i64Duration > 0 && m_bReLoad)
  {
    ui.slider->setRange(0, i64Duration);
    m_bReLoad = false;
  }
}


void VideoPlayer::OnStateChanged(QMediaPlayer::State enumState)
{
  if (QMediaPlayer::StoppedState == enumState)
  {
    ui.BtnPlay->setEnabled(true);
    ui.BtnStop->setEnabled(false);
    ui.slider->setEnabled(false);
  }
  else if (QMediaPlayer::PlayingState == enumState)
  {
    ui.BtnPlay->setEnabled(false);
    ui.BtnStop->setEnabled(true);
    ui.slider->setEnabled(true);
  }
}

main.cpp中的代码：

#include "VideoPlayer.h"
#include <QtWidgets/QApplication>

int main(int argc, char *argv[])
{
  QApplication a(argc, argv);
  VideoPlayer w;
  w.show();
  return a.exec();
}