网站安全维护怎么做,全屋定制给设计吗,适合个人做外贸的网站,做一网站要什么时候开始一Qt 音频基础知识
QT multimediaQMediaPlayer 类#xff1a;媒体播放器#xff0c;主要用于播放歌曲、网络收音 机等功能。QMediaPlaylist 类#xff1a;专用于播放媒体内容的列表。
二 音频项目实战程序
//版本5.12.8
.proQT core gui
QT multimedia
greate…一Qt 音频基础知识
QT multimediaQMediaPlayer 类媒体播放器主要用于播放歌曲、网络收音 机等功能。QMediaPlaylist 类专用于播放媒体内容的列表。
二 音频项目实战程序
//版本5.12.8
.proQT core gui
QT multimedia
greaterThan(QT_MAJOR_VERSION, 4): QT widgetsCONFIG c11# The following define makes your compiler emit warnings if you use
# any Qt feature that has been marked 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 it uses 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_BEFORE0x060000 # disables all the APIs deprecated before Qt 6.0.0SOURCES \main.cpp \mainwindow.cppHEADERS \mainwindow.hFORMS \mainwindow.ui# Default rules for deployment.
qnx: target.path /tmp/$${TARGET}/bin
else: unix:!android: target.path /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS targetRESOURCES \images.qrc
#ifndef MAINWINDOW_H
#define MAINWINDOW_H#include QMainWindow
#include QMediaPlayer
#include QMediaPlaylist
#include QFileDialog
#include QStringList
QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACEclass MainWindow : public QMainWindow
{Q_OBJECTpublic:MainWindow(QWidget *parent nullptr);~MainWindow();private:Ui::MainWindow *ui;//定义播放对象QMediaPlayer * player;//播放对象QMediaPlaylist *playlist;//播放列表QString drtTime;//歌曲时长QString psTime;//播放位置进度private slots:void onstatechg(QMediaPlayer::State state);//播放按钮的切换状态void onplaylisting(int pos);//播放列表void onDrtchg(qint64 drt);//歌曲总时间长度void onpstchg(qint64 pos);//播放歌曲当前位置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_Volumn_clicked();void on_horizontalSlider_Volumn_valueChanged(int value);void on_horizontalSlider_Speed_valueChanged(int value);
};
#endif // MAINWINDOW_H#include mainwindow.h
#include ui_mainwindow.hMainWindow::MainWindow(QWidget *parent): QMainWindow(parent), ui(new Ui::MainWindow)
{ui-setupUi(this);player new QMediaPlayer(this);playlist new QMediaPlaylist(this);playlist-setPlaybackMode(QMediaPlaylist::Loop);//默认循环模式player-setPlaylist(playlist);connect(player,SIGNAL(statechanged(QMediaPlayer::State)),this,SLOT(onstatechg(QMediaPlayer::State)));//信号与槽的链接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;
}
//播放按钮的切换状态
void MainWindow::onstatechg(QMediaPlayer::State state)
{ui-pushButton_Player-setEnabled(!(stateQMediaPlayer::PlayingState));ui-pushButton_Pause-setEnabled(stateQMediaPlayer::PlayingState);ui-pushButton_Stop-setEnabled(stateQMediaPlayer::PlayingState);
}
//播放列表
void MainWindow::onplaylisting(int pos)
{ui-listWidget-setCurrentRow(pos);//选中当前行QListWidgetItem *item ui-listWidget-currentItem();if(item)ui-label_Name-setText(item-text());}
//歌曲总时间长度,更新变化进度
void MainWindow::onDrtchg(qint64 drt)
{ui-horizontalSlider_Speed-setMaximum(drt);int sec drt/1000;//秒int min sec/60;//分sec sec%60;//余数为妙//drtTime QString::asprintf(%d:%d,min,sec);ui-label_Time-setText(psTime|drtTime);}
//播放歌曲当前位置,更新变化情况
void MainWindow::onpstchg(qint64 pos)
{if(ui-horizontalSlider_Speed-isSliderDown())return;//ui-horizontalSlider_Speed-setSliderPosition(pos);int sec pos/1000;//秒int min sec/60;//分sec sec%60;//余数为妙//psTime QString::asprintf(%d:%d,min,sec);ui-label_Time-setText(psTime|drtTime);}
//44:20void MainWindow::on_pushButton_open_clicked()
{//添加歌曲文件QString currentpath QDir::homePath();//获取当前目录QString dlgtitle 请选择音频文件;//文件的对话框的标题QString strfilter 所有文件(*.*);;音频文件(*.mp3 *.wav);;MP3文件(*.mp3);;WAV文件(*.wav);QStringList filelist QFileDialog::getOpenFileNames(this,dlgtitle,currentpath,strfilter);if(filelist.count()1){return;}for(int i 0;ifilelist.count();i){//添加文件实现播放QString afile filelist.at(i);playlist-addMedia(QUrl::fromLocalFile(afile));//添加文件QFileInfo fileinfo(afile);//将文件添加到 listwidget控件来ui-listWidget-addItem(fileinfo.fileName());}if(player-state()!QMediaPlayer::PlayingState){playlist-setCurrentIndex(0);}//播放player-play();}void MainWindow::on_pushButton_Player_clicked()
{//判断当前播放哪一个if(playlist-currentIndex()0)playlist-setCurrentIndex(0);player-play();}void MainWindow::on_pushButton_Pause_clicked()
{//暂停player-pause();
}void MainWindow::on_pushButton_Stop_clicked()
{//停止player-stop();
}void MainWindow::on_pushButton_Prev_clicked()
{//上一曲playlist-previous();
}void MainWindow::on_pushButton_Next_clicked()
{//下一曲playlist-next();
}void MainWindow::on_pushButton_Volumn_clicked()
{//控制静音状态bool mute player-isMuted();player-setMuted(!mute);if(mute){ui-pushButton_Volumn-setIcon(QIcon(:/new/prefix1/images/volumn.bmp));}else{ui-pushButton_Volumn-setIcon(QIcon(:/new/prefix1/images/mute.bmp));}}void MainWindow::on_horizontalSlider_Volumn_valueChanged(int value)
{//调整音量player-setVolume(value);ui-label_VolumeSize-setNum(value);
}void MainWindow::on_horizontalSlider_Speed_valueChanged(int value)
{//调整播放进度player-setPosition(value);}
