Solved QAudioDeviceInfo cannot find available audio device in RPi ?

[Hiloshi]

Dear Sirs,

I tried below code on RPi3:

foreach (const QAudioDeviceInfo &deviceInfo, QAudioDeviceInfo::availableDevices(QAudio::AudioOutput))
qDebug() << "Device name: " << deviceInfo.deviceName();

In WIN7, it shows correct audio device, such as "Realtek HD Audio".

However, in RPi3, it cannot find ant audio device. I can play music to 3.5mm Headphone jack by CLI:

aplay -D hw:0,0 123.wav

So I believe audio device is working, I don't know why above QT demo code not working.

Another clue is: I use "./configure xxxxxxxxx --recheck" it shows

ALSA ................................... no

Do I have to see it "YES" then can work ?

Is there anyone can help ?

[SGaist]

Hi,

That would help yes. For that you need to have the ALSA development package on your Pi for when you build Qt.

[SGaist]

Hi,

That would help yes. For that you need to have the ALSA development package on your Pi for when you build Qt.

[Hiloshi]

@SGaist ,

After install alsa-dev package and re-run ./configure, then I can see ALSA is YES.
And thus QAudioDeviceInfo can see audio sound card.

Thanks.