CODEWITHSUNDEEP
qt
Vivek Vishwakarma
Vivek Vishwakarma

Reputation: 89

How to Play sound file till it finished in Qt?

I am using QSound to play audio file. Audio file duration is 10 sec. I have some task after playing the complete 10 sec audio file. So for this I am using QSound::isFinished method, but this always returns false instantly. example

Upvotes: 1

Views: 2100

Answers (2)

vpicaver
vpicaver

Reputation: 1801

Use a QSoundEffect instead and connect to the playingChanged signal.

http://doc.qt.io/qt-5/qsoundeffect.html#playing-prop

Upvotes: 1

MildWolfie
MildWolfie

Reputation: 2542

Based on the current wording of the question, I'm assuming you're checking isFinished immediately, which will indeed return false.

I think you're best bet is to use QTimer and connect it's timeout signal to some slot which will check isFinished. You would start the timer when the sound starts playing. When isFinished returns true, you can stop the timer and do whatever it is that needs doing. If it returns false, wait for the next timeout.

// In the .h
// ...

private slots:
    void onTimeout();

private:
    QTimer* timer;
    QSound sound;

// ...


// In the .cpp
// In your constructor
// ...

timer = new Timer();
connect( timer, SIGNAL( timeout() ), this, SIGNAL( onTimeout() ) ),

// ...
// Starting the sound
// ...

sound.play();
timer.start( 10 );  // In milliseconds.


// ...
// onTimeout slot

void MyClass::onTimeout()
{
    if( sound.isFinished() )
    {
        timer.stop();

        // Do some things.
    }
}

I chose 10 milliseconds in the assumption that the audio file's of different length could be played. QSound is also not guaranteed to start playback immediately.

If you know for a fact that the audio played will always have the same length, you could forgo the isFinished check and change the Timer to a single shot with a duration the same length of the file (plus a bit to account for variable start times). This will result in it only timing out once, and should do so after the file has finished. That's not my preferred method, but it is a possibility.

Upvotes: 3

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