QSoundEffect and iOS (Low Latency sound format)

q8phantom

Actually, What I've found at the Qt sources is the problem I guess

https://qt.gitorious.org/qt/qtmultimedia/source/02245571bf13e29512f096d1566d6107d5a229de:src/plugins/coreaudio/coreaudiooutput.mm#L559

Look at the function

@
void CoreAudioOutput::setVolume(qreal volume)
{
const qreal normalizedVolume = qBound(qreal(0.0), volume, qreal(1.0));
m_cachedVolume = normalizedVolume;
if (!m_isOpen) {
return;
}
//TODO: actually set the output volume here
//To set the output volume you need a handle to the mixer unit
}@

Seems that it is not done, setVolume method isn't working with QSoundEffect

j.ekman

I recently ran into the same problem, but the problem was that coreaudio played audio through the earpiece instead of the speakers.

It seems the default category is set to "PlayAndRecord"

https://qt.gitorious.org/qt/qtmultimedia/source/02245571bf13e29512f096d1566d6107d5a229de:src/plugins/coreaudio/coreaudiosessionmanager.mm#L214

Changing it to "Playback" seems to play back sounds with full volume.

lynic

I am currently facing the same problem with the volume. How did you change the category from "PlayAndRecord" to "Playback"?

lynic

I am currently facing the same problem with the volume. How did you change the category from "PlayAndRecord" to "Playback"?

SGaist

Hi,

He changed Qt's source code and build it

SGaist

Hi,

He changed Qt's source code and build it

lynic

Thanks ;). I thought that there is maybe a way to get access to the CoreAudio* modules during development without having to recompile.

lynic

Thanks ;). I thought that there is maybe a way to get access to the CoreAudio* modules during development without having to recompile.

lynic

Bug report + fix: https://bugreports.qt.io/browse/QTBUG-44757

lynic

Bug report + fix: https://bugreports.qt.io/browse/QTBUG-44757

SGaist

You should send your patch for review on gerrit

SGaist

You should send your patch for review on gerrit