基于QMediaPlayer的简易视频播放器

公司项目有个背景音乐的功能，所以就做了个简版播放器
使用QMediaPlayer，QMediaPlaylist，QVideoWidget我这主要就是循环播放
音量条和进度条还不知道做不做，先留着吧，等做再完善
新增进度条控制，点击事件，还有关闭窗口音乐播放的bug
audioWindow.h

#ifndef AUDIOWINDOW_H
#define AUDIOWINDOW_H

#include <QDialog>
#include <QWidget>
#include <QMediaPlayer>
#include <QMediaPlaylist>
#include <QVideoWidget>
#include <QTimer>
#include <QSlider>
#include <QMouseEvent>
#include <QCoreApplication>

class QDialog;
class CustomSlider : public QSlider
{
	Q_OBJECT
public:
	CustomSlider(QWidget *parent = 0) : QSlider(parent)
	{
	}
protected:
	void mousePressEvent(QMouseEvent *ev);//重写QSlider的mousePressEvent事件
signals:
	void costomSliderClicked();//自定义的鼠标单击信号，用于捕获并处理
};
class AudioWindow :public QDialog

{
	Q_OBJECT

public:
	AudioWindow(QWidget* parent = 0);
	void closeEvent(QCloseEvent *event);
private:
	void initLayout();
	QString path;
	QMediaPlayer* player;
	//与Slider有关的播放控制变量
	QTimer * timer;
	int maxValue = 1000;//设置进度条的最大值
	CustomSlider* sliderDuration;
	QVideoWidget* videoWidget;
	QMediaPlaylist* playlist;


private slots:

	void closeAudio();
	void openAudio();
	void createAudioPlayer();
	void restartAudio();
	void stopAudio();
	void pauseAudio();
	void playAudio();
	void sliderProgressClicked();
	void sliderProgressMoved();
	void sliderProgressReleased();
	void onTimerOut();
};



#endif // !AUDIOWINDOW_H

audioWindow.cpp

#include "audioWindow.h"
#include <QMediaPlayer>
#include <QMediaPlaylist>
#include <QVideoWidget>
#include <QFileDialog>
#include <QHBoxLayout>
#include <QVBoxLayout>
#include <QPushButton>
#include <QMessageBox>
#include <QSlider>


AudioWindow::AudioWindow(QWidget *parent)
	: QDialog(parent)
{
	initLayout();
}



void AudioWindow::initLayout()
{

	this->setWindowTitle(QStringLiteral("背景音乐"));
	this->setObjectName(QStringLiteral("AudioWindow"));;
	QHBoxLayout* hlayout1 = new QHBoxLayout();
	QHBoxLayout* hlayout2 = new QHBoxLayout();
	QVBoxLayout* vlayout1 = new QVBoxLayout();
	QPushButton* openAudioFile = new QPushButton(QStringLiteral("打开背景音乐"));
	QPushButton* playAudio = new QPushButton(QStringLiteral("播放"));
	QPushButton* pauseAudio = new QPushButton(QStringLiteral("暂停"));
	QPushButton* stopAudio = new QPushButton(QStringLiteral("停止"));
	QPushButton* continueAudio = new QPushButton(QStringLiteral("继续"));
	QPushButton* closeButton = new QPushButton(QStringLiteral("关闭"));
	sliderDuration = new CustomSlider();
	sliderDuration->setOrientation(Qt::Horizontal);
	//读取文件后再启用
	sliderDuration->setEnabled(false);
	QObject::connect(openAudioFile, SIGNAL(clicked()), this, SLOT(openAudio()));
	QObject::connect(playAudio, SIGNAL(clicked()), this, SLOT(playAudio()));
	QObject::connect(pauseAudio, SIGNAL(clicked()), this, SLOT(pauseAudio()));
	QObject::connect(stopAudio, SIGNAL(clicked()), this, SLOT(stopAudio()));
	QObject::connect(continueAudio, SIGNAL(clicked()), this, SLOT(restartAudio()));
	QObject::connect(closeButton, SIGNAL(clicked()), this, SLOT(closeAudio()));
	//进度条控制
	QObject::connect(sliderDuration, SIGNAL(costomSliderClicked()), this, SLOT(sliderProgressClicked()));
	QObject::connect(sliderDuration, SIGNAL(sliderMoved()), this, SLOT(sliderProgressMoved()));
	QObject::connect(sliderDuration, SIGNAL(sliderReleased()), this, SLOT(sliderProgressReleased()));


	hlayout1->addWidget(sliderDuration);
	hlayout2->addWidget(openAudioFile);
	hlayout2->addWidget(playAudio);
	hlayout2->addWidget(pauseAudio);
	hlayout2->addWidget(continueAudio);
	hlayout2->addWidget(closeButton);

	vlayout1->addLayout(hlayout1);
	vlayout1->addLayout(hlayout2);
	this->setLayout(vlayout1);

	player = new QMediaPlayer();
	videoWidget = new QVideoWidget();
	playlist = new QMediaPlaylist();
}


void AudioWindow::closeAudio()   //关闭播放器
{
	if (player != NULL){
		player->stop();
	}

	this->close();    //关闭播放器
}

void AudioWindow::playAudio()   //播放
{
	player->play();
}
/**
* 音频插入动作
*/
void AudioWindow::openAudio()
{
	QString fileName = QFileDialog::getOpenFileName(this, QStringLiteral("打开音频文件"), QDir::currentPath()); //获取文件打开路径
	if (fileName.isEmpty()) {

		QMessageBox::warning(this, "Warning", QStringLiteral("未选择打开文件"));
		return;
	};
	//启用slider并设置范围
	sliderDuration->setEnabled(true);
	sliderDuration->setRange(0, maxValue);

	timer = new QTimer();
	timer->setInterval(1000);
	timer->start();
	//将timer连接至onTimerOut槽函数
	connect(timer, SIGNAL(timeout()), this, SLOT(onTimerOut()));

	path = fileName;
	createAudioPlayer();
}

/**
* 创建音频播放器
*/
void AudioWindow::createAudioPlayer()
{
	playlist->addMedia(QUrl(path));
	playlist->setCurrentIndex(0);
	playlist->setPlaybackMode(QMediaPlaylist::CurrentItemInLoop);
	player->setPlaylist(playlist);
	player->setVideoOutput(videoWidget);
	videoWidget->show();
	player->setVolume(60);

}

/**
* 音频继续播放动作
*/
void AudioWindow::restartAudio()
{
	if (player == NULL)
	{
		return;
	}
	player->play();
}

/**
* 音频停止播放动作
*/
void AudioWindow::stopAudio()
{
	if (player == NULL)
	{
		return;
	}
	player->stop();
}

/**
* 音频暂停播放动作
*/
void AudioWindow::pauseAudio()
{
	//pauseFlag = true;
	//time.stop();
	if (player == NULL)
	{
		return;
	}
	player->pause();
}

void AudioWindow::onTimerOut()
{
	if (player == NULL)
	{
		return;
	}
	sliderDuration->setValue(player->position()*maxValue / player->duration());
}

//单击、拖动、释放
void AudioWindow::sliderProgressClicked()
{
	if (player == NULL)
	{
		return;
	}
	player->setPosition(sliderDuration->value()*player->duration() / maxValue);
}

void AudioWindow::sliderProgressMoved()
{
	//暂时停止计时器，在用户拖动过程中不修改slider的值
	if (player == NULL)
	{
		return;
	}
	timer->stop();
	player->setPosition(sliderDuration->value()*player->duration() / maxValue);
}

void AudioWindow::sliderProgressReleased()
{
	//用户释放滑块后，重启定时器
	if (timer == NULL)
	{
		return;
	}
	timer->start();
}


void CustomSlider::mousePressEvent(QMouseEvent *ev)
{
	//注意应先调用父类的鼠标点击处理事件，这样可以不影响拖动的情况
	QSlider::mousePressEvent(ev);
	//获取鼠标的位置，这里并不能直接从ev中取值（因为如果是拖动的话，鼠标开始点击的位置没有意义了）
	double pos = ev->pos().x() / (double)width();
	setValue(pos * (maximum() - minimum()) + minimum());
	//发送自定义的鼠标单击信号
	emit costomSliderClicked();
}

void AudioWindow::closeEvent(QCloseEvent *event)
{
	if (player != NULL)
	{
		player->stop();
	}
	event->accept();  //接受退出信号，程序退出  

}