基于Qt的QMediaPlayer生成的音乐播放器

#include "musicplayer.h" #include "ui_musicplayer.h" MusicPlayer::MusicPlayer(QWidget *parent) : QWidget(parent), ui(new Ui::MusicPlayer) { ui->setupUi(this); init(); initConnect(); } MusicPlayer::~MusicPlayer() { delete ui; } void MusicPlayer::slot_selectFile() { //打开目录，获取目录或文件 // fileName = QFileDialog::getOpenFileName(this,"选择音频文件","E:/Music","music(*.mp3);;movie(*.mp4)"); fileName = QFileDialog::getExistingDirectory(this,"选择文件夹","E:/Music"); if(!fileName.isEmpty()) { //设置文件类型过滤 QDir dir(fileName); QStringList filters; filters<<"*.mp3"<<"*.mp4"<<"*.m4a"<<"*.wav"<<"*.flac"; dir.setNameFilters(filters); //每次选择目录都会清空当前listwidget数据 ui->musicList->clear(); //遍历list获取过滤后的每一个文件名，放到listwidget中 fileList = dir.entryInfoList(); for(int i=0;i<fileList.size();i++) { QString filename = fileList[i].fileName(); ui->musicList->addItem(filename); } } //当列表中无文件数据时禁止按钮点击 if(fileList.count()>=1) { ui->player->setEnabled(true); ui->pause->setEnabled(true); ui->preview->setEnabled(true); ui->next->setEnabled(true); ui->order->setEnabled(true); ui->loop->setEnabled(true); } else { ui->player->setEnabled(false); ui->pause->setEnabled(false); ui->preview->setEnabled(false); ui->next->setEnabled(false); ui->order->setEnabled(false); ui->loop->setEnabled(false); } } void MusicPlayer::slot_playMusic() { if(!musicUrl.isEmpty()) { //获取音频时长 player->setMedia(QUrl::fromLocalFile(musicUrl)); loadMusic(); } } void MusicPlayer::slot_mediaStatus(QMediaPlayer::MediaStatus status) { if(status == QMediaPlayer::EndOfMedia) { if(sortFlag == true) { m_index = ui->musicList->currentRow(); if(m_index <fileList.count()-1) ui->musicList->setCurrentRow(m_index+1); else if(m_index == fileList.count()-1) ui->musicList->setCurrentRow(0); } } else if(status == QMediaPlayer::BufferedMedia) { qint64 duration = player->duration(); int minutes = duration / 60000; int remainSecond = (duration % 60000)/1000; //初始化进度条 formattedTime = QString("%1:%2").arg(minutes,2,10,QChar('0')).arg(remainSecond,2,10,QChar('0')); ui->timeCount->setText(QString("00:00/%1").arg(formattedTime)); } } void MusicPlayer::slot_getInfo(QListWidgetItem* item) { //获取音频文件名称 musicUrl = fileName + "/" +item->text(); } void MusicPlayer::slot_durationChanged(qint64 duration) { ui->musicBar->setRange(0,duration); } void MusicPlayer::slot_valueChanged(int value) { player->setPosition(value); } void MusicPlayer::slot_positionChanged(qint64 position) { ui->musicBar->setValue(position); int minutes = position / 60000; int seconds = (position%60000)/1000; ui->timeCount->setText(QString("%1:%2/%3").arg(minutes,2,10,QChar('0')).arg(seconds,2,10,QChar('0')).arg(formattedTime)); } void MusicPlayer::slot_pause() { if(player->state() == QMediaPlayer::PlayingState) { player->pause(); ui->pause->setText("继续播放"); } else if(player->state() == QMediaPlayer::PausedState) { player->play(); ui->pause->setText("暂停播放"); } } void MusicPlayer::slot_preview() { m_index = ui->musicList->currentRow()-1; if(m_index == -1) m_index = fileList.size()-1; //将ListWidget中上一首进行选中，第一首会跳到最后一首 ui->musicList->setCurrentRow(m_index); //获取上一首音频的文件名称 musicUrl = fileName + "/" +ui->musicList->item(m_index)->text(); slot_playMusic(); } void MusicPlayer::slot_next() { m_index = ui->musicList->currentRow()+1; if(m_index >= fileList.size()) m_index = 0; //将ListWidget中下一首进行选中，最后一首点击时重头开始 ui->musicList->setCurrentRow(m_index); //获取下一首音频的文件名称 musicUrl = fileName + "/" +ui->musicList->item(m_index)->text(); slot_playMusic(); } //循环播放，只会将列表中当前选择的项以及后面的项依次进行播放 void MusicPlayer::slot_sortPlay() { m_index = ui->musicList->currentRow(); QMediaPlaylist* playlist = new QMediaPlaylist; playlist->setPlaybackMode(QMediaPlaylist::Sequential); qDebug()<<m_index; for(int i = m_index+1;i<=fileList.size();i++) { ui->musicList->setCurrentRow(m_index); musicUrl = fileName + "/" +ui->musicList->item(i-1)->text(); QUrl fileUrl = QUrl::fromLocalFile(musicUrl); playlist->addMedia(fileUrl); } player->setPlaylist(playlist); loadMusic(); sortFlag = true; } void MusicPlayer::slot_loopPlay() { QMediaPlaylist* playlist = new QMediaPlaylist; playlist->setPlaybackMode(QMediaPlaylist::Loop); musicUrl = fileName + "/" +ui->musicList->currentItem()->text(); QUrl fileUrl = QUrl::fromLocalFile(musicUrl); playlist->addMedia(fileUrl); player->setPlaylist(playlist); loadMusic(); } void MusicPlayer::init() { player = new QMediaPlayer(); ui->musicList->setSelectionMode(QAbstractItemView::SingleSelection); } void MusicPlayer::initConnect() { connect(ui->select,SIGNAL(clicked()),this,SLOT(slot_selectFile())); connect(ui->player,SIGNAL(clicked()),this,SLOT(slot_playMusic())); connect(ui->musicList,SIGNAL(itemClicked(QListWidgetItem*)),this,SLOT(slot_getInfo(QListWidgetItem*))); // connect(ui->musicBar,SIGNAL(valueChanged(int)),this,SLOT(slot_valueChanged(int))); connect(ui->musicBar,SIGNAL(sliderMoved(int)),this,SLOT(slot_valueChanged(int))); connect(player,SIGNAL(durationChanged(qint64)),this,SLOT(slot_durationChanged(qint64))); connect(player,SIGNAL(positionChanged(qint64)),this,SLOT(slot_positionChanged(qint64))); connect(ui->pause,SIGNAL(clicked()),this,SLOT(slot_pause())); connect(ui->preview,SIGNAL(clicked()),this,SLOT(slot_preview())); connect(ui->next,SIGNAL(clicked()),this,SLOT(slot_next())); connect(ui->order,SIGNAL(clicked()),this,SLOT(slot_sortPlay())); connect(ui->loop,SIGNAL(clicked()),this,SLOT(slot_loopPlay())); connect(player,SIGNAL(mediaStatusChanged(QMediaPlayer::MediaStatus)),this,SLOT(slot_mediaStatus(QMediaPlayer::MediaStatus))); } void MusicPlayer::loadMusic() { //等待音频加载结束 while(player->mediaStatus()!=QMediaPlayer::LoadedMedia) { int ms = 100; QEventLoop loop; QTimer::singleShot(ms, &loop, &QEventLoop::quit); loop.exec(); } qint64 duration = player->duration(); int minutes = duration / 60000; int remainSecond = (duration % 60000)/1000; //初始化进度条 formattedTime = QString("%1:%2").arg(minutes,2,10,QChar('0')).arg(remainSecond,2,10,QChar('0')); ui->timeCount->setText(QString("00:00/%1").arg(formattedTime)); player->play(); sortFlag = false; qDebug()<<duration<<musicUrl<<formattedTime; }