Q: Qt - [c++] Qt6 TextToSpeech does not use Localization

kevin_d

Hello everyone!

Ich ported my project to Qt6. In the Windows build, everything works fine, except that the TextToSpeech engine does not speak English anymore (which worked in Qt 5.15.2).
I used the following function. Explanation: I try to switch randomly between different voices. (In Windows i usually have only one voice).

What's wrong?

void SpeechClass::say(QString text, bool )
{
    if (text2Speech == nullptr)
    {
        QLocale::setDefault(QLocale(QLocale::English, QLocale::LatinScript, QLocale::UnitedStates));
        text2Speech = new QTextToSpeech(this);
        text2Speech->setVolume(0.88);
        text2Speech->setLocale(QLocale(QLocale::English, QLocale::LatinScript, QLocale::UnitedStates));

        QVector<QLocale> _l = text2Speech->availableLocales();
        int num_locales = _l.size();

        for (int loc = 0; loc < num_locales; loc++)
        {
            if (_l.at(loc).language() == QLocale::English)
            {
                text2Speech->setLocale(_l.at(loc));
                QVector<QVoice> _v = text2Speech->availableVoices();
                int num_voices = _v.size();
                int __v = rand() % num_voices;
                text2Speech->setVoice(_v.at(__v));
                break;
            }
        }
    }
    text2Speech->setLocale(QLocale(QLocale::English, QLocale::LatinScript, QLocale::UnitedStates));
    text2Speech->say(text);
}

best regards, kevin_d

kevin_d

The speech output seems to have german phonetics (My Windows is a german installation).

SGaist

Hi,

Which version of Qt 6 are you using ?
On which version of Windows ?

kevin_d

Qt 6.8.2 on Windows 11 Home 24H2.
regards, kevin

kevin_d

Solution is still pending... Does anyone know about this?
cheers, kevin_d

SGaist

Might be silly but since you are randomizing the voice, did you stumble upon something that was maybe broken on your system ?

kevin_d

No, I don't think so.
Sorry for the late update: With Qt6.8.2 i only have two locales available, which are both QLocale::German.
With Qt5 I had at least one QLocale::English.
Can I fix this? Maybe add an additional library to include an english Locale?

best regards, kevin_d

Reference: https://forum.qt.io/topic/80840/qtexttospeech-locales

SGaist

Do you still have Qt 5 on that machine ?
If so I would check Qt's sources to see what has changed between the two in the Windows backend.

kevin_d

It appears as if I have mutliple engines installed on my setup.
So, instead of

auto *text2speech = new QTextToSpeech(this);

i changed my code accordingly:

for (auto const& v : QTextToSpeech::availableEngines()) {
	qDebug() << "available engine: " << v.toStdString();
	auto *text2Speech = new QTextToSpeech(v);
	// find suitable locales
}

So I am not randomizing voices anymore. I take the first best english voice.

It works. Now testing on Linux :-)

best regards, kevin_d