QAudioOutput in a QThread - problem.

[high_flyer]

If the audio output is busy playing one sound, pushing more data to it from another thread won't cause two sounds to play simoultaneously, one needs a mixer for that.

True, but that is still not his problem, since he only plays the sound once, over a thread.
I have a suspition, that it has to do with the fact the thread runs (and probably finishes) before QApplication::exec() is called.
My guess is, that there are some events that need the QApplication event loop... but as I said, this is only a guess.
This is why I suggested the sleep.
Another way to test it would be to start the thread after QApplication::exec() has been called.

When this is solved, the problem with multiple sounds on the sound system with out a mixer problem will still be there though...

[_franko_]

Thanks to all for your responds.

Yes it's true that it has something to do with main event loop.
I check in debug and I hear a sound only when QApplication::exec() was processing.
So maybe I need do something with local event loop.
I'll still searching though.

[high_flyer]

So maybe I need do something with local event loop.

I thought as much.
Nothing special to do, just start the thread after QApplication::exec() has been called, from your widget for example.

[_franko_]

@high_flyer:
Thanks for your replies.
Pause between calling my function didn't change anything.
I tried to play a sound in separate thread when i press the QButton widget but it doesn't help neither.

I really don't know what to do next.
I start to thinking that is not possible to play sound in different threads than GUI's one...

[high_flyer]

Have a look at QEventLoop, maybe you could do something with that.

But I think playing sound in threads is more a design problem, if you design properly, you probably wont need this.

[wysota]

True, but that is still not his problem, since he only plays the sound once, over a thread.

I don't think so, look:

That works ok but when client send more same message in short time not all sounds were played.

Sound is played asynchronously so there is no benefit in doing that in a thread. You can run the event loop of the thread and the sound will probably play fine but it won't change the fact that sounds won't be able to mix. It could even crash the application.

[high_flyer]

You can run the event loop of the thread and the sound will probably play fine but it won't change the fact that sounds won't be able to mix.

Yes, as I said before, I agree with that too.
These were to separate problems - one getting the events through, the other - parallel audio with out mixing.

[danjiun]

So. Somebody now have a solution for use QAudioOutput within a QThread ?
Somebody speek about Events but how and which events ?
Please somebody help me.

Daniel

[danjiun]

Hi.
I write for other people, because i already found a solution.
The key is : from the thread you create a QAudioOutput and start it, you need to enter the event loop, and this is only possible after executing exec().
So after start you QAudioOutput, in the run() function you need to write :
exec()
This is new for me, because i come from the World of MFC, and there for calling to IDirectSound, where i engage a sound without need to enter a event loop.
In fact, now i transport everything i do before with MFC, (for Windows), a project from before 10 years ago, to QT.
I am already 8 years Linux-user, but i want compatibility with every operativ system.
Greatings. Daniel