QMediaPlayer playback rate

[Hung Tran]

I read: http://doc.qt.io/qt-5/qtmultimedia-multimediawidgets-player-example.html

In files: playercontrols.cpp and playercontrols.h
Qt define:
void PlayerControls::setPlaybackRate(float rate) to set playback rate.
I want to confirm: rate parameter is corresponding:
qreal PlayerControls::playbackRate() const
Values return from: qreal PlayerControls::playbackRate() const will be set for current playback rate.
Mean:
PlayerControls::setPlaybackRate(qreal PlayerControls::playbackRate())

Is this correct ? If not, could you please explain in advance for set playback rate.

Thank so much.

[tekojo]

Hi @Hung-Tran
Yes, when you change the playback rate in the controls, this signal/slot pair happens:

 connect(rateBox, SIGNAL(activated(int)), SLOT(updateRate()));

and that emits another signal:

void PlayerControls::updateRate()
{
    emit changeRate(playbackRate());
}

And that goes to player.cpp here:

connect(controls, SIGNAL(changeRate(qreal)), player, SLOT(setPlaybackRate(qreal)));

And that changes the playback rate.

It is all done with signals and slots. I hope that helps.

[Hung Tran]

@tekojo WoW. I miss

connect(controls, SIGNAL(changeRate(qreal)), player, SLOT(setPlaybackRate(qreal)));

so I have misunderstand. Thank so much. I got this Idea