QMediaDevices audio outputs have wrong sample rates

TheEnigmist

I'm trying to play some audio on output devices. Since I was getting some errors with format I printed all devices preferred foramt and found out that they accept a sample rate less than showed in system info.
Here system info default audio output:

Here what Qt6.3 says about preferred format:

This is sample code I used to create audio output:

QAudioOutput *audioOutput = new QAudioOutput(QMediaDevices::defaultAudioOutput());
for (QAudioDevice a : QMediaDevices::audioOutputs()) {
    QAudioFormat t = audioOutput->device().preferredFormat();
    qDebug() << a.description() << t.channelCount() << t.sampleRate() << t.sampleFormat();
}
QAudioSink* testAudio = new QAudioSink(audioOutput->device().preferredFormat(), baseWidget);
QIODevice* audioDevice = testAudio->start();

This leads to an incorrect playback of input file (a little bit "slowed" since his sample rate is 48000)

SGaist

Hi,

The preferred format is one thing, why not set the one that you actually want ?

TheEnigmist

@SGaist Yes that was what I was trying. But I found the error. SampleFormat was set to Unknown instead of Int16. Now I only need to syncronize and write audio in the right rate