[提问]Phonon中mediaObject类 [复制链接]

connect(mediaObject, SIGNAL(tick(qint64)), this, SLOT(tick(qint64)));    connect(mediaObject, SIGNAL(stateChanged(Phonon::State,Phonon::State)),            this, SLOT(stateChanged(Phonon::State,Phonon::State)));    connect(metaInformationResolver, SIGNAL(stateChanged(Phonon::State,Phonon::State)),            this, SLOT(metaStateChanged(Phonon::State,Phonon::State)));    connect(mediaObject, SIGNAL(currentSourceChanged(Phonon::MediaSource)),            this, SLOT(sourceChanged(Phonon::MediaSource)));    connect(mediaObject, SIGNAL(aboutToFinish()), this, SLOT(aboutToFinish()));1.mediaObject类主要提供一个能够处理媒体播放的介面。这个怎么理解？2.上面五个信号，都是干嘛的？