player

MediaPlayer+AudioOutput(m_mediaPlayer->setAudioOutput(m_audioOutput);)
获取文件目录
QDirIterator，.hasNext()进行遍历
播放逻辑

void MusicPlayer::on_musicListView_doubleClicked(const QModelIndex &index)
{
    auto url=index.data(Qt::UserRole+1).toUrl();
    m_mediaPlayer->setSource(url);
    m_mediaPlayer->play();
}

StandardItemModel在viewList上展示(数据处理setModel,appendRow)