基于QT实现一个多功能媒体播放器，它能播放音频（如mp3），视频
媒体播放器界面，有进度条，可展示总播放时间、当前播放时间，进度条可拖动，有播放、暂停键，有快进、快退键，上一曲下一曲，静音，调节音量，双击播放歌曲，以及简单的歌词同步。
主界面如下：
创建三个本地文件夹分别存放MV，歌词和音乐文件
工程结构目录如下（整个结构没有设计好，所以每个视频都要单独创建文件）：
mainwindow.h代码如下：
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QMediaPlayer>
#include <QMediaPlaylist>
#include <QMediaPlayer>
#include <QStringList>
#include <QDir>
#include <QTime>
#include <QTimer>
#include<videoplayer.h>
#include<videoplayer_qr.h>
#include<videoplayer_cq.h>
QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
MainWindow(QWidget *parent = nullptr);
~MainWindow();
private:
Ui::MainWindow *ui;
VideoPlayer *v1;
videoplayer_qr *v_qr;
videoplayer_cq *v_cq;
bool isPlay=false;
bool ismute=false;
QString MusicPath="C:\\Users\\44637\\Music\\QTMusic";
QString LrcPath="C:\\Users\\44637\\Music\\QTLrc";
QStringList fileList; //文件名称
QStringList lrcList;
QMediaPlaylist *PlayerList;
QMediaPlayer *Player;
int moved;
int iCount=0;
QTimer *timer2;
QMap<int, QString> map;
QMap<QString, QString> *map2;
void getHeader(const char *str, QString &des);
void getTime(QString line);//改动二
private slots:
void init();//初始化
void addItem(QString name); //把歌名添加到musicname上
QStringList getFileNames(const QString &path); //获取路径下所有文件名
QStringList getLrcNames(const QString &path); //获取路径下所有文件名
void slotButtonStart();//播放
void slotButtonLast();//上一首
void slotButtonNext();//下一首
void slotShowCurrentMusic();//显示当前播放的歌曲
void volumChange(int);//控制音量
void positionChange(qint64 position);//进度条随着音乐播放变化
void seekChange(int position); //滑动滑动条快进、倒退音乐，且音乐已播放时长也跟着变化
void musicTime();//歌曲总时间
void slotShowCurrentLrc();
void showWord(int time);//显示歌词
void initlrc(const QString& fileName);//初始化歌词
void button_style();//按钮样式
void changestartbutton();
void cleanmap();
void playto(int i,int );//双击播放
void video_click_wm();//播放相应视频
void video_click_qr();
void video_click_cq();
void mute();//静音
void fastForward();//快进
void fastBack();//快退
};
#endif // MAINWINDOW_H
mainwindow.cpp代码如下：
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QDebug>
#include <QFile>
#include <QTextStream>
#include <QTextCodec>
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
, ui(new Ui::MainWindow)
{
ui->setupUi(this);
connect(ui->Buttonstart,&QPushButton::clicked,this,&MainWindow::slotButtonStart);
connect(ui->Buttonlast,&QPushButton::clicked,this,&MainWindow::slotButtonLast);
connect(ui->Buttonnext,&QPushButton::clicked,this,&MainWindow::slotButtonNext);
connect(ui->Buttonstart,&QPushButton::clicked,this,&MainWindow::changestartbutton);
connect(ui->Buttonvideo_wm,&QPushButton::clicked,this,&MainWindow::video_click_wm);
connect(ui->Buttonvideo_qr,&QPushButton::clicked,this,&MainWindow::video_click_qr);
connect(ui->Buttonvideo_cq,&QPushButton::clicked,this,&MainWindow::video_click_cq);
connect(ui->Buttonmute,&QPushButton::clicked,this,&MainWindow::mute);
connect(ui->fastButton,&QPushButton::clicked,this,&MainWindow::fastForward);
connect(ui->fastbackButton,&QPushButton::clicked,this,&MainWindow::fastBack);
init();
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::init(){
button_style();
PlayerList = new QMediaPlaylist; //实例化播放器和播放列表
Player = new QMediaPlayer;
fileList = getFileNames(this->MusicPath); //获取文件夹下所有音乐文件
lrcList = getLrcNames(this->LrcPath);
moved = 0;
qDebug()<<"ALL Music File \n"<<fileList;
qDebug()<<"ALL Lrc File \n"<<lrcList;
for(int i=0;i<fileList.size();i++){
QString fileName=fileList.at(i);
addItem(fileName);
PlayerList->addMedia(QUrl::fromLocalFile(MusicPath+"\\"+fileName));
}
PlayerList->setCurrentIndex(0);
Player->setPlaylist(PlayerList); //将播放列表加载到播放器
connect(Player,&QMediaPlayer::currentMediaChanged,this,&MainWindow::slotShowCurrentMusic);
connect(Player,&QMediaPlayer::currentMediaChanged,this,&MainWindow::slotShowCurrentLrc);
connect(Player,&QMediaPlayer::currentMediaChanged,this,&MainWindow::cleanmap);
connect(ui->Buttonstart,&QPushButton::clicked,this,&MainWindow::slotShowCurrentLrc);
connect(ui->Buttonnext,&QPushButton::clicked,this,&MainWindow::slotShowCurrentLrc);
connect(ui->Buttonlast,&QPushButton::clicked,this,&MainWindow::slotShowCurrentLrc);
connect(ui->Buttonstart,&QPushButton::clicked,this,&MainWindow::slotShowCurrentMusic);
connect(ui->Volumebar, SIGNAL(sliderMoved(int)), this, SLOT(volumChange(int)));
connect(Player,SIGNAL(positionChanged(qint64)),this,SLOT(positionChange(qint64)));
connect(Player,SIGNAL(durationChanged(qint64)),this,SLOT(musicTime()));
connect(ui->Progressbar,SIGNAL(sliderMoved(int)),this,SLOT(seekChange(int)));
connect(ui->musicname,SIGNAL(cellDoubleClicked(int,int)),this,SLOT(playto(int,int)));
}
QStringList MainWindow::getFileNames(const QString &path)
{
QDir dir(path);
QStringList nameFilters;
nameFilters << "*.mp3";
QStringList files = dir.entryList(nameFilters, QDir::Files|QDir::Readable, QDir::Name);
return files;
}
QStringList MainWindow::getLrcNames(const QString &path)
{
QDir dir(path);
QStringList nameFilters;
nameFilters <<"*.txt";
QStringList files = dir.entryList(nameFilters, QDir::Files|QDir::Readable, QDir::Name);
return files;
}
void MainWindow::addItem(QString name){
int count = ui ->musicname->rowCount();
ui->musicname->setRowCount(count+1);
QTableWidgetItem *itemName = new QTableWidgetItem(name);
itemName->setFlags(itemName->flags() & ~Qt::ItemIsEditable);
ui->musicname->setItem(count,0,itemName);
}
void MainWindow::slotShowCurrentMusic(){
int index=PlayerList->currentIndex();
QString songName=fileList.at(index);
ui->CurrentMusic->setText(songName);
}
void MainWindow::slotShowCurrentLrc(){
int index=PlayerList->currentIndex();
qDebug()<<index;
QString musicLrc=lrcList.at(index);
qDebug()<<musicLrc;
initlrc(musicLrc);
}
void MainWindow::slotButtonStart(){
if(!isPlay){
isPlay=true;
Player->setVolume(100);
Player->play();
musicTime();
}
else{
isPlay=false;
Player->pause();
musicTime();
}
}
void MainWindow::slotButtonLast(){
int currentIndex = PlayerList->currentIndex();
if(currentIndex == 0){
currentIndex=PlayerList->mediaCount();
}
else{
PlayerList->previous();
PlayerList->previousIndex();
musicTime();
}
}
void MainWindow::slotButtonNext(){
int currentIndex = PlayerList->currentIndex();
if(++currentIndex == PlayerList->mediaCount()){
currentIndex=0;}
PlayerList->setCurrentIndex(currentIndex);
musicTime();
}
void MainWindow::volumChange(int vol)
{
Player -> setVolume(vol);
}
void MainWindow::positionChange(qint64 position)
{
ui->Progressbar->setMaximum(Player->duration() / 1000);//设置滑块的长度范围为音乐长.00度
ui->Progressbar->setValue(position / 1000);//如果音乐进度改变，则改变滑块显示位置
moved = position;//让播放时间等于音乐进度（毫秒）
QTime moveTime(0,(moved/60000) % 60,(moved / 1000) % 60);//设置时间
ui->showPro ->setText(moveTime.toString("mm:ss"));//显示时间
QString t=moveTime.toString("mm:ss");
QString mm = t.mid(0,2);
QString ss = t.mid(3, 2);
int m = mm.toInt();
int s = ss.toInt();
int time = m*60*1000 + s*1000;
showWord(time);
}
void MainWindow::seekChange(int position)
{
Player -> setPosition(position * 1000);//如果滑块改变位置，则改变音乐进度
moved = position * 1000;//让播放时间等于音乐进度（毫秒）
QTime moveTime(0,(moved/60000) % 60,(moved / 1000) % 60);//设置时间
ui->showPro ->setText(moveTime.toString("mm:ss"));//显示时间
}
void MainWindow::musicTime(){
qint64 time = Player->duration();
QTime Time(0,(time % (1000 * 60 * 60)) / (1000 * 60),(time % (1000 * 60)) / 1000);
ui->MusicTime->setText(Time.toString("mm:ss"));
qDebug()<<"time:"<<Time;
}
void MainWindow::showWord(int time)
{
if(map.contains(time))
{
ui->label1->setText(map.value(time));
}
else{
qDebug()<<"继续上一句歌词";
}
}
void MainWindow::getHeader(const char *str, QString &des)
{
des = des.remove(str);
des = des.remove("]");
}
void MainWindow::getTime(QString line)//获取lrc文件的每句的时间
{
if(line.startsWith("["))
{
int index = line.indexOf("]");
QString t = line.mid(1, index - 1);
QString mm = t.mid(0,2);
QString ss = t.mid(3, 2);
int m = mm.toInt();
int s = ss.toInt();
int time = m*60*1000 + s*1000;
t = line.mid(index + 1);
index = t.lastIndexOf("]");
if(index < 0)
{
map.insert(time, t);
}
else
{
t = t.mid(index + 1);
map.insert(time, t);
getTime(t);
qDebug()<<"time123:"<<time;
}
}
}
void MainWindow::initlrc(const QString& fileName)
{
QMap<int, QString> map;
QString l;
QFile file("C:\\Users\\44637\\Music\\QTLrc\\"+fileName);
if(file.exists()){
qDebug()<<"文件存在";
}
else{
qDebug()<<"文件不存在";
}
if (!file.open(QIODevice::ReadOnly | QIODevice::Text)){
return;
}
QTextCodec *codec = QTextCodec::codecForName("GBK");
while(!file.atEnd())
{
QString line = codec->toUnicode(file.readLine());
QString s(line);
if(s.length()<4)
continue;
if(s.startsWith("[ti:"))
{
getHeader("[ti:", s);
map.insert(0, s);
ui->topmusicname->setText(s);
continue;
}
else if(s.startsWith("[ar:"))
{
getHeader("[ar:", s);
map.insert(1000, s);
ui->singer->setText("歌手："+s);
continue;
}
else if(s.startsWith("[al:"))
{
getHeader("[al:", s);
map.insert(2000, s);
ui->album->setText("专辑："+s);
continue;
}
else if(s.startsWith("[by:"))
{
getHeader("[by:", s);
map.insert(3000, s);
continue;
}
else
{
getTime(s);
}
}
file.close();
}
void MainWindow::button_style(){
ui->Buttonstart->setIcon(QIcon("E:\\QT\\QTcode\\MusicPlayer\\icon\\start.jpg"));
ui->Buttonlast->setIcon(QIcon("E:\\QT\\QTcode\\MusicPlayer\\icon\\last.jpg"));
ui->Buttonnext->setIcon(QIcon("E:\\QT\\QTcode\\MusicPlayer\\icon\\next.png"));
ui->Buttonmute->setIcon(QIcon("E:\\QT\\QTcode\\MusicPlayer\\icon\\volume.jpg"));
ui->Buttonvideo_qr->setIcon(QIcon("E:\\QT\\QTcode\\MusicPlayer\\icon\\MV.png"));
ui->Buttonvideo_wm->setIcon(QIcon("E:\\QT\\QTcode\\MusicPlayer\\icon\\MV.png"));
ui->Buttonvideo_cq->setIcon(QIcon("E:\\QT\\QTcode\\MusicPlayer\\icon\\MV.png"));
}
void MainWindow::changestartbutton(){
if(isPlay)
ui->Buttonstart->setIcon(QIcon("E:\\QT\\QTcode\\MusicPlayer\\icon\\pause.jpg"));
else
ui->Buttonstart->setIcon(QIcon("E:\\QT\\QTcode\\MusicPlayer\\icon\\start.jpg"));
}
void MainWindow::cleanmap(){
map.clear();
}
void MainWindow::playto(int i,int )
{
PlayerList->setCurrentIndex(i);
isPlay=true;
changestartbutton();
QString musicLrc=lrcList.at(i);
initlrc(musicLrc);
Player->play();
}
void MainWindow::video_click_wm(){
v1= new VideoPlayer(this);
v1->setModal(false);
v1->show();
}
void MainWindow::video_click_qr(){
v_qr= new videoplayer_qr(this);
v_qr->setModal(false);
v_qr->show();
}
void MainWindow::video_click_cq(){
v_cq= new videoplayer_cq(this);
v_cq->setModal(false);
v_cq->show();
}
void MainWindow::mute(){
if(!ismute){
Player -> setVolume(0);
//ui->voiceslider->value();
ui->Buttonmute->setIcon(QIcon("E:\\QT\\QTcode\\MusicPlayer\\icon\\mute.png"));
ismute=true;
}
else{
Player -> setVolume(100);
ui->Buttonmute->setIcon(QIcon("E:\\QT\\QTcode\\MusicPlayer\\icon\\volume.jpg"));
ismute=false;
}
}
void MainWindow::fastForward(){
qint64 position=Player->position();
qDebug()<<"position"<<position;
position=position+5000;
ui->Progressbar->setValue(position/1000);
Player -> setPosition(position);//如果滑块改变位置，则改变音乐进度
}
void MainWindow::fastBack(){
qint64 position=Player->position();
qDebug()<<"position"<<position;
position=position-5000;
ui->Progressbar->setValue(position/1000);
Player -> setPosition(position);//如果滑块改变位置，则改变音乐进度
}
videoplayer.h代码如下（视频播放和音乐播放差不多）：
#ifndef VIDEOPLAYER_H
#define VIDEOPLAYER_H
#include <QDialog>
#include <QMediaPlayer>
#include <QVideoWidget>
#include <QMediaPlaylist>
#include <QTime>
#include <QTimer>
namespace Ui {
class VideoPlayer;
}
class VideoPlayer : public QDialog
{
Q_OBJECT
public:
explicit VideoPlayer(QWidget *parent = nullptr);
~VideoPlayer();
public slots:
void init();
void slotButtonStart();
void slotstop();
void closeEvent(QCloseEvent *);
void volumChange(int);
void positionChange(qint64 position);
void seekChange(int position); //滑动滑动条快进、倒退音乐，且音乐已播放时长也跟着变化
void videoTime();
void changestartbutton();
void button_style();
void mute();
private:
QMediaPlayer* player;
QVideoWidget* videoWidget;
QMediaPlaylist* playlist;
Ui::VideoPlayer *ui;
bool isPlay_wm=false;
bool ismute=false;
int moved;
};
#endif // VIDEOPLAYER_H
videoplayer.cpp代码如下：
#include "videoplayer.h"
#include "ui_videoplayer.h"
#include <QDebug>
#include <QFile>
#include <QCloseEvent>
VideoPlayer::VideoPlayer(QWidget *parent) :
QDialog(parent),
ui(new Ui::VideoPlayer)
{
ui->setupUi(this);
qDebug()<<"执行到此处";
connect(ui->Buttonstart,&QPushButton::clicked,this,&VideoPlayer::changestartbutton);
connect(ui->Buttonmute,&QPushButton::clicked,this,&VideoPlayer::mute);
init();
connect(ui->Buttonstart,&QPushButton::clicked,this,&VideoPlayer::slotButtonStart);
connect(ui->voiceSlider, SIGNAL(sliderMoved(int)), this, SLOT(volumChange(int)));
connect(player,SIGNAL(positionChanged(qint64)),this,SLOT(positionChange(qint64)));
connect(ui->timeSlider,SIGNAL(sliderMoved(int)),this,SLOT(seekChange(int)));
connect(player,SIGNAL(durationChanged(qint64)),this,SLOT(videoTime()));
}
VideoPlayer::~VideoPlayer()
{
slotstop();
delete ui;
}
void VideoPlayer::init(){
//widget=new QWidget;
button_style();
player= new QMediaPlayer;
videoWidget=new QVideoWidget;
playlist=new QMediaPlaylist;
playlist->clear();
playlist->addMedia(QUrl::fromLocalFile("C:\\Users\\44637\\Music\\MV\\陈奕迅-我们MV.mp4"));
player->setPlaylist(playlist);
QFile file("C:\\Users\\44637\\Music\\MV\\陈奕迅-我们MV.mp4");
if(!file.open(QIODevice::ReadOnly))
qDebug() << "Could not open file";
player->setVideoOutput(videoWidget);
player->setPlaylist(playlist);
videoWidget->setAutoFillBackground(true);
QPalette qplte;
qplte.setColor(QPalette::Window, QColor(0,0,0));
videoWidget->setPalette(qplte);
ui->verticalLayout->addWidget(videoWidget);
player->play();
isPlay_wm=true;
}
void VideoPlayer::slotButtonStart(){
if(!isPlay_wm){
isPlay_wm=true;
//Player->setVolume(100);
player->play();
//musicTime();
//qApp->quit();
}
else{
isPlay_wm=false;
player->pause();
//musicTime();
}
}
void VideoPlayer::slotstop(){
player->stop();
playlist->clear();
//player->
}
void VideoPlayer::closeEvent(QCloseEvent *event){
slotstop();
event->accept();
}
void VideoPlayer::volumChange(int vol)
{
player -> setVolume(vol);
}
void VideoPlayer::positionChange(qint64 position)
{
ui->timeSlider->setMaximum(player->duration() / 1000);//设置滑块的长度范围为音乐长.00度
ui->timeSlider->setValue(position / 1000);//如果音乐进度改变，则改变滑块显示位置
moved = position;//让播放时间等于音乐进度（毫秒）
QTime moveTime(0,(moved/60000) % 60,(moved / 1000) % 60);//设置时间
ui->currenttime ->setText(moveTime.toString("mm:ss"));//显示时间
QString t=moveTime.toString("mm:ss");
QString mm = t.mid(0,2);
QString ss = t.mid(3, 2);
int m = mm.toInt();
int s = ss.toInt();
int time = m*60*1000 + s*1000;
qDebug()<<"int"<<time;
}
void VideoPlayer::seekChange(int position)
{
player -> setPosition(position * 1000);//如果滑块改变位置，则改变音乐进度
moved = position * 1000;//让播放时间等于音乐进度（毫秒）
QTime moveTime(0,(moved/60000) % 60,(moved / 1000) % 60);//设置时间
}
void VideoPlayer::videoTime(){
qint64 time = player->duration();
QTime Time(0,(time % (1000 * 60 * 60)) / (1000 * 60),(time % (1000 * 60)) / 1000);
ui->videotime->setText(Time.toString("mm:ss"));
qDebug()<<"time:"<<Time;
}
void VideoPlayer::changestartbutton(){
if(!isPlay_wm)
ui->Buttonstart->setIcon(QIcon("E:\\QT\\QTcode\\MusicPlayer\\icon\\pause.jpg"));
else
ui->Buttonstart->setIcon(QIcon("E:\\QT\\QTcode\\MusicPlayer\\icon\\start.jpg"));
}
void VideoPlayer::button_style(){
ui->Buttonstart->setIcon(QIcon("E:\\QT\\QTcode\\MusicPlayer\\icon\\pause.jpg"));
ui->Buttonmute->setIcon(QIcon("E:\\QT\\QTcode\\MusicPlayer\\icon\\volume.jpg"));
}
void VideoPlayer::mute(){
if(!ismute){
player -> setVolume(0);
ui->Buttonmute->setIcon(QIcon("E:\\QT\\QTcode\\MusicPlayer\\icon\\mute.png"));
ismute=true;
}
else{
player -> setVolume(100);
ui->Buttonmute->setIcon(QIcon("E:\\QT\\QTcode\\MusicPlayer\\icon\\volume.jpg"));
ismute=false;
}
}
总体运行界面如下：
一些关键方法和思路：
(1)导入歌曲:
从本地文件将歌曲名和歌曲的歌词导入，获取文件路径下所有的音乐文件和歌词文件，生成两个QStringList类型的列表。同时将歌名添加到显示歌名的组件上。同时实例化播放器和播放列表，将列表逐项加载到播放列表上，并将播放列表加载到播放器上。
(2)音乐、视频进度条:
设置滑块的长度范围为音乐长0.001倍，如果音乐进度发生改变，则同时改变滑块位置，如果滑块改变位置，则改变音乐进度。同时设置时间，让播放时间等于音乐进度（毫秒）并用Qlabel组件显示。
(3)显示歌词:（个人觉得这是个最难的点，参考了大神的思路，加上自己的思考，搞了好久才搞出来
