QMediaPlayer 类：媒体播放器，主要用于播放歌曲、网络收音机等功能。
在pro文件中添加QT += multimedia
- QAudioFrePro.pro
#-------------------------------------------------
#
# Project created by QtCreator 2024-01-17T22:18:26
#
#-------------------------------------------------
QT += core gui
QT +=multimedia
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
TARGET = QAudioFrePro
TEMPLATE = app
# The following define makes your compiler emit warnings if you use
# any feature of Qt which has been marked as deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS
# You can also make your code fail to compile if you use deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0
CONFIG += c++11
SOURCES += \
main.cpp \
mainwindow.cpp
HEADERS += \
mainwindow.h
FORMS += \
mainwindow.ui
# Default rules for deployment.
qnx: target.path = /tmp/$${
TARGET}/bin
else: unix:!android: target.path = /opt/$${
TARGET}/bin
!isEmpty(target.path): INSTALLS += target
RESOURCES += \
images.qrc
- mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
//添加头文件
#include <QMediaPlayer>//媒体播放器
#include <QMediaPlaylist>//播放列表
#include <QFileDialog>//选择播放的歌曲
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = nullptr);
~MainWindow();
private:
Ui::MainWindow *ui;
QMediaPlayer *player;//播放器的对象
QMediaPlaylist *playlist;//播放列表
QString drtTime;//歌曲时长
QString pstTime;//播放位置
//自定义槽函数，描述歌曲切换的状态
private slots:
void onstatechg(QMediaPlayer::State state);//按钮的切换状态
void onplaylisting(int pos);//播放列表
void onDrtchg(qint64 drt);//歌曲总时长
void onpstchg(qint64 pos);//播放歌曲的当前位置
void on_pushButton_open_clicked();
void on_pushButton_player_clicked();
void on_pushButton_Pause_clicked();
void on_pushButton_stop_clicked();
void on_pushButton_Prev_clicked();
void on_pushButton_Next_clicked();
void on_pushButton_Volumnm_clicked();
void on_horizontalSlider_Volumn_valueChanged(int value);
void on_horizontalSlider_valueChanged(int value);
};
#endif // MAINWINDOW_H
- main.cpp
#include "mainwindow.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}
- mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
player = new QMediaPlayer(this);
playlist = new QMediaPlaylist(this);
playlist->setPlaybackMode(QMediaPlaylist::Loop);//循环模式
player->setPlaylist(playlist);
connect(player,SIGNAL(stateChanged(QMediaPlayer::State)),this,SLOT(onstatechg(QMediaPlayer::State)));
connect(player,SIGNAL(positionChanged(qint64)),this,SLOT(onpstchg(qint64)));
connect(player,SIGNAL(durationChanged(qint64)),this,SLOT(onDrtchg(qint64)));
connect(playlist,SIGNAL(currentIndexChanged(int)),this,SLOT(onplaylisting(int)));
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::onstatechg(QMediaPlayer::State state)//按钮的切换状态
{
ui->pushButton_player->setEnabled(!(state == QMediaPlayer::PlayingState));//播放按钮
ui->pushButton_Pause->setEnabled(state == QMediaPlayer::PlayingState);//暂停按钮
ui->pushButton_stop->setEnabled(state == QMediaPlayer::PlayingState);//停止按钮
}
void MainWindow::onplaylisting(int pos)//播放列表
{
ui->listWidget->setCurrentRow(pos);
QListWidgetItem *item = ui->listWidget->currentItem();
if(item)
ui->label_name->setText(item->text());
}
void MainWindow::onDrtchg(qint64 drt)//歌曲总时长、更新变化进度
{
ui->horizontalSlider->setMaximum(drt);
int sec = drt/1000;//秒
int min = sec/60; //分
sec = sec%60; //余数秒
drtTime = QString::asprintf("%d:%d",min,sec);
ui->label_process->setText(pstTime+"|"+drtTime);
}
void MainWindow::onpstchg(qint64 pos)//播放歌曲的当前位置、更新变化情况
{
if(ui->horizontalSlider->isSliderDown())
return;
ui->horizontalSlider->setSliderPosition(pos);
int sec = pos/1000;//秒
int min = sec/60; //分
sec = sec%60; //余数秒
pstTime = QString::asprintf("%d:%d",min,sec);
ui->label_process->setText(pstTime+"/"+drtTime);
}
void MainWindow::on_pushButton_open_clicked()
{
//添加歌曲文件
QString currentpath = QDir::homePath();
QString dlgtitle = "请选择音频文件:";//文件对话框标题
QString strfilter = "所有文件(*.*);;音频文件(*.mp3 *.wav);;mp3文件(*.mp3)";
QStringList filelist = QFileDialog::getOpenFileNames(this,dlgtitle,currentpath,strfilter);
if(filelist.count() < 1)
return;
for(int i = 0;i < filelist.count();i++)
{
QString afile = filelist.at(i);
playlist->addMedia(QUrl::fromLocalFile(afile));//添加文件
QFileInfo fileinfo(afile);
ui->listWidget->addItem(fileinfo.fileName());//将文件添加到界面listwidget控件
}
if(player->state() != QMediaPlayer::PlayingState)
playlist->setCurrentIndex(0);
player->play();
}
void MainWindow::on_pushButton_player_clicked()
{
if(playlist->currentIndex() < 0)
playlist->setCurrentIndex(0);
player->play();
}
void MainWindow::on_pushButton_Pause_clicked()
{
player->pause();
}
void MainWindow::on_pushButton_stop_clicked()
{
player->stop();
}
void MainWindow::on_pushButton_Prev_clicked()
{
playlist->previous();
}
void MainWindow::on_pushButton_Next_clicked()
{
playlist->next();
}
void MainWindow::on_pushButton_Volumnm_clicked()
{
//控制静音状态
bool mute = player->isMuted();
player->setMuted(!mute);
if(!mute)
ui->pushButton_Volumnm->setIcon(QIcon(":/new/prefix1/Images/mute.bmp"));
else
ui->pushButton_Volumnm->setIcon(QIcon(":/new/prefix1/Images/volumn.bmp"));
}
void MainWindow::on_horizontalSlider_Volumn_valueChanged(int value)
{
player->setVolume(value);
}
void MainWindow::on_horizontalSlider_valueChanged(int value)
{
player->setPosition(value);
}
- mainwindow.ui
- 运行结果：
