基于Qt实现音频播放器

#include "m_player.h" #include "ui_m_player.h" #include <QFileDialog> #include <QFileInfo> #include <QMediaPlayer> #include <QMediaPlaylist> #include <QDebug> #include <QUrl> #include "widgetvolume.h" m_player::m_player(QWidget *parent) : QWidget(parent), ui(new Ui::m_player) { ui->setupUi(this); Init(); } m_player::~m_player() { delete ui; } //初始化 void m_player::Init() { playList=new QMediaPlaylist; playList->setPlaybackMode(QMediaPlaylist::Loop); player=new QMediaPlayer; player->setPlaylist(playList); m_pwidgetvolume = new WidgetVolume; slot_CreatContextMenu(); connect(ui->horizontalSlider,SIGNAL(sliderMoved(int)),this,SLOT(slot_setPosition(int) ) ); connect(player,SIGNAL(positionChanged(qint64)),this,SLOT(slot_positionChanged(qint64))); connect(player,SIGNAL(durationChanged(qint64)),this,SLOT(slot_durationChanged(qint64))); connect(player,SIGNAL(stateChanged(QMediaPlayer::State)),this,SLOT(slot_player_stateChanged(QMediaPlayer::State) ) ); connect(playList,SIGNAL(currentIndexChanged(int)),this,SLOT(slot_updateList(int ))); } //时间事件 void m_player::timerEvent(QTimerEvent *event) { if( timerID == event->timerId() ) { int value = ui->horizontalSlider->value() + 1; ui->horizontalSlider->setValue( value ); if( value == ui->horizontalSlider->maximum() ) { killTimer( timerID ); } } } //选择打开文件 void m_player::on_pushButton_clicked() { QString initialName=QDir::homePath(); QStringList pathList=QFileDialog::getOpenFileNames(this, tr("选择文件"), initialName, tr("*.mp3","*wmv")); for(int i=0; i<pathList.size(); ++i) { QString path=QDir::toNativeSeparators(pathList.at(i)); if(!path.isEmpty()) { playList->addMedia(QUrl::fromLocalFile(path)); QString fileName=path.split("\\").last(); ui->listWidget->addItem(fileName); } } } //播放 void m_player::slot_playMusic(QString FilePath) { playList->setCurrentIndex(ui->listWidget->currentIndex().row()); player->play(); } //双击自动播放 void m_player::on_listWidget_doubleClicked(const QModelIndex &index) { ui->label->setText( ui->listWidget->currentItem()->text() ); qDebug()<<ui->listWidget->currentIndex().row(); playList->setCurrentIndex( ui->listWidget->currentIndex().row() ); player->play(); ui->btn_start->setText(tr("PASUE") ); } //调节音量,暂未实现 void m_player::on_pushButton_2_clicked() { if(ui->pushButton_2->isChecked() ) { m_pwidgetvolume->show(); m_pwidgetvolume->move(this->rect().width()-30,this->rect().height()-60); } else { if(m_pwidgetvolume != NULL) { m_pwidgetvolume->hide(); } } } //调节快进后,音乐播放也快进 void m_player::slot_setPosition(int value) { player->setPosition(value); } //调节快进 void m_player::slot_positionChanged(qint64 position) { ui->horizontalSlider->setValue(position); } //获取歌曲的长度,并设置长度 void m_player::slot_durationChanged(qint64 duration) { ui->horizontalSlider->setRange(0,duration); } //播放或者暂停 void m_player::on_btn_start_clicked() { switch (player->state()) { case QMediaPlayer::PlayingState: player->pause(); break; default: player->play(); break; } } //播放状态的改变 void m_player::slot_player_stateChanged(QMediaPlayer::State state) { switch (state) { case QMediaPlayer::PlayingState: ui->btn_start->setText("pause"); break; default: ui->btn_start->setText("play"); break; } } //创建右键菜单,选择播放模式 void m_player::slot_CreatContextMenu() { m_pContextMenu = new QAction(this); m_pContextMenu->setSeparator(true); addAction( ui->m_pActionCurrentItemInLoop); addAction(ui->m_pActionLoop); addAction(ui->m_pActionRandom); addAction(ui->m_pActionSequential); setContextMenuPolicy(Qt::ActionsContextMenu); } void m_player::on_m_pActionLoop_triggered() { playList->setPlaybackMode(QMediaPlaylist::Loop); } void m_player::on_m_pActionCurrentItemInLoop_triggered() { playList->setPlaybackMode(QMediaPlaylist::CurrentItemInLoop); } void m_player::on_m_pActionRandom_triggered() { playList->setPlaybackMode(QMediaPlaylist::Random); } void m_player::on_m_pActionSequential_triggered() { playList->setPlaybackMode(QMediaPlaylist::Sequential); } void m_player::on_btn_last_clicked() { int currentIndex=playList->currentIndex(); if(--currentIndex<0) currentIndex=0; playList->setCurrentIndex(currentIndex); player->play(); } void m_player::on_btn_next_clicked() { int currentIndex=playList->currentIndex(); if(++currentIndex==playList->mediaCount()) currentIndex=0; playList->setCurrentIndex(currentIndex); player->play(); } void m_player::slot_updateList(int value) { QListWidgetItem *item = ui->listWidget->item(value); item->setSelected(true); ui->label->setText(item->text()); }